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91	Chemistry	ABS-706
YEAST PRODUCING CELLULOSE ENZYME AS AN CONTROL OF PATHOGENIC MOLD IN CHOCOLATE FRUIT FROM SENTUL, JAWA BARAT Dalia Sukmawati1,2, G. Assabillah Sondana1, N. Nov Fikriyyah1, Z. Nur Afifah1, A. Firhandini1, U.Khumaiya1, D.Ayu Komsiatun1, Y.Tri Asmara1 , Rini Puspitaningrum 1, H. El Enshasy3,4 Nining Betawati Prihantini5 1Biology Department, 9th Floor Hasyim Ashari Building, Faculty of Mathematics and Natural Sciences, Universitas Negeri Jakarta, Jakarta, Indonesia 2Universitas Negeri Jakarta Culture Collection, 9th Floor Hasyim Ashari Building, Faculty of Mathematics and Natural Sciences, Universitas Negeri Jakarta, Jakarta, Indonesia 3Institute of Bioproduct Development (IBD), Universiti Teknologi Malaysia (UTM), 81130 UTM, Skudai, Malaysia 4Departemen of Bioprocess and Polymer Engineering, School of Chemical and Energy Engineering, Faculty of Enginering, Universiti Teknologi Malaysia, 81310, Skudai, Johor, Malaysia 5Department of Biology, Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Indonesia, Kampus UI, Depok 16424, Indonesia Abstract Mold is one of the microorganisms that can cause disease in chocolate fruit. Molds produce phytopathogenic toxins that are toxic. Control of pathogen fungi has been using pesticides. The use of pesticides can be harmful to human health. One alternative control by using yeast is isolated from the cocoa bean fermentation process. The purpose of this study is the isolation, screening of the ability of yeast to produce cellulase enzymes, and testing the ability of yeast antagonists from chocolate fermentation to control the pathogens of chocolate fruit. Yeast isolation is carried out by the dilution method in medium PDA, mold isolation is carried out by the direct planting method and paste in medium PDA, screening ability to produce cellulase enzymes is carried out by agar diffusion method in medium CMC, and testing the ability of antagonism is done by the double culture method in medium PDA. The results obtained from the isolation results were 128 yeast isolates and 37 mold isolates. Screening 77 representative yeast producing cellulose obtained 5 isolates with highest cellulolytic index 0,24-0,30 U/mL. Antagonism test using 6 isolates for screening cellulose enzyme. The result yeast obtained that isolate C3.3.1 was potential isolates in inhibiting pathogenic molds in chocolate with inhibiting capacity 37,36%. Keywords: Yeast, chocolate, mold, phatogenic Share Link | Plain Format | Corresponding Author (Dalia Sukmawati)

92	Chemistry	ABS-201
Synthesis of ZrO2 via Ultrasonic Assisted Precipitation Method for Photodegradation of Methylene Blue Nanda Dwimar Hakim[1], Soni Setiadji[1,*], Sanusi[1], Neng Hani Handayani[1], Tety Sudiarti[1], Asti Sawitri[2], Hasniah Aliah[2] and Dani Gustaman Syarif[3] 1Department of Chemistry, Faculty of Science and Technology, UIN Sunan Gunung Djati Bandung, Jl. A.H. Nasution No.105 Bandung, West Java, 40614, Indonesia. 2Department of Physics, Faculty of Science and Technology, UIN Sunan Gunung Djati Bandung, Jl. A.H. Nasution No.105 Bandung, West Java, 40614, Indonesia. 3Lab. of Material Physics, Badan Tenaga Atom Nasional, Jl. Taman Sari Bandung No. 71, West Java, 40132, Indonesia. Abstract Zirconia dioxide (ZrO2) is a semiconductor material which its photocatalytic properties for degradation of methylene blue has been done in our research. Herein, ultrasonic assisted during precipitation is used to increase the photocatalytic activity of ZrO2. ZrO2 is prepared from ZrCl4 solution by adding NaOH through precipitation method without ultrasonic assisted, and also with ultrasonic assisted for 1 h and 2 h. The specimens of ZrO2 are analyzed by X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), and Brunauer-Emmett-Teller (BET). The XRD of all ZrO2 samples showed that the smallest ZrO2 crystal size was 8.149 nm based on Debye-Scherrer calculations for ultrasonic time of 2 h. The lattice parameter of ZrO2 under tetragonal phase is analyzed using rietvield refinement by La Beil method. The specific surface area of all ZrO2 specimens are confirmed by BET which the results shows that ultrasonic time during precipitation along 2 h can increase the specific surface area of 99.741 m2/g when compared to without ultrasonic of 44.508 m2/g. The effect of ultrasonic assisted during precipitation can be increase the photocatalytic activity. The case shown that the degradation of methylene blue by ZrO2 with 2 h ultrasonic assisted is more high than ZrO2 of 1 h ultrasonic assisted and ZrO2 without ultrasonic assisted, i.e. 93.00 %, 88,32 % and 77.53 % respectively, at 120 min irradiation, pH of 10 and 0,05 g of ZrO2. Keywords: ZrO2 nanoparticles, ultrasonic-assisted, precipitation, photocatalyst, methylene blue Share Link | Plain Format | Corresponding Author (Soni Setiadji)

93	Chemistry	ABS-973
Dioscorea Alata L anthocyanin methanol extract as a potential optical active pH sensitive compound Eka Safitri (a), Hani Humaira (a), Nazaruddin (a), Susilawati, Murniana (a) and Nor DiyanaMd Sani (b) a) Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia *e.safitri[at]unsyiah.ac.id b) Sanichem Resources Sdn. Bhd. No 7 & 7A Jalan Timur 6/1A Mercato Enstek, Bandar Estek 71060, Negeri Sembilan, Malaysia (b) Abstract Anthocyanin from Dioscorea alata L has been successfully extracted using methanol solvent and has been tested for its sensitivity towards pH change in citrate and phosphate buffer solutions using a UV-Vis spectrophotometer. The extracted anthocyanin tested positive for the presence of flavonoid and phenol. The total yield of crude extract was 1.63% corresponding to 3.34 x 10-7 M or 16.72 mg/kg dried sample. The maximum absorption against citrate buffer at wavelength 600 nm produced a linear range from pH 4 to 8, with sensitivity = 0.121 and R2 = 0.98. In addition, the maximum absorption for phosphate buffer occurs at wavelength 590 nm with a response linear range of pH 6 to 8 and sensitivity = 0.296 (R2 = 0.97) The optimum buffer concentration for both citrate and phosphate buffer solutions are 0.1M and 0.075 M respectively. The extracted anthocyanin showed a stable response against citrate and phosphate buffer for 140 minutes. Therefore, the extracted anthocyanin can be potentially used as an active substance to develop an optical pH sensor and biosensor based on pH change. Keywords: Dioscorea alata L ; pH; pH active compound Share Link | Plain Format | Corresponding Author (Eka Safitri)

94	Chemistry	ABS-206
The effect of concentration and temperature on the activities of kenikir (cosmos caudatus) leaf extract as iron corrosion inhibitor in electrolyte solution of NaCl Tety Sudiarti, Yulianti, Asep supriadin UIN Sunan Gunung Djati Bandung Abstract Ethyl acetate extracts from kenikir leaves contain flavanoid, alkaloids and tannins compounds. This compound can be used as a corrosion inhibitor because it contains nitrogen atoms with a pair of free electrons so that it allows adsorbed strongly on the surface of the iron and increases the activity of corrosion inhibition. The inhibitory activity was analyzed by wheel test method or measurement of weight loss in NaCl 1 % medium with variations in concentration, temperature and electron microscopy (SEM) analysis. The inhibitory activity of kenikir leaf extract increases with increasing concentration of inhibitor. The optimum inhibition efficiency of was obtained at a concentration of 32 ppm with an inhibition efficiency of 86.84%. An increase in temperature from 25-55 ° C causes decreased inhibitory activity and achieves optimum inhibition efficiency at 25 ° C. Kenikir leaf extract has adsorption properties that correspond to the Langmuir adsorption isotherm with free energy of ΔGads of -14.98 KJ / mol. The results of the surface analysis by Scanning Electron Microscopy (SEM) showed that the kenikir leaf extract could inhibit corrosion rates with iron surfaces that had fewer pores than without inhibitors. Keywords: kenikir (cosmos caudatus) leaf extract ; corrosion inhibitor; Wheel Test ; SEM Share Link | Plain Format | Corresponding Author (Tety Sudiarti)

95	Chemistry	ABS-212
Aplication of Nanogold and Nanosilver to Reduce Rheumatic Arthritis: Case Study at Leprosy Patients Titik Taufikurohmah 1, a, Rusmini 1, b, and Djodjok Soepardjo 2, c 1 Chemistry Department Universitas Negeri Surabaya, Indonesia 2 Japanese Department Universitas Negeri Surabaya, Indonesia a = corespondent author titiktaufikurohmah[at]unesa.ac.id, b rusmini[at]unesa.ac.id, c djodjoksoepardjo[at]unesa.ac.id Abstract This study aims to ensure the treatment of rheumatoid arthritis cases suffered by leprosy patients. Background, there are many leprosy patients who suffer from arthritis in joint arthritis. Swollen joints and difficulty walking are the initial conditions of volunteers. This condition, besides making it difficult for them to walk, also paralyzes their enthusiasm for life. Lying all day is boring and sad. Nanogold is a remedy for rheumatoid arthritis in its early use as a drug. Nanosilver is a broad-spectrum anti-microbial including leprosy bacteria. It is necessary to immediately conduct nanogold and nanosilver trial on leprosy patients who have rheumatoid arthritis. Special inspection is carried out every 2 weeks during the treatment. Treatment by giving nanogold and nanosilver volunteers every morning and night as much as 20 ml 20 ppm in drinking water. The number of volunteers 24 people with an age range of 40-70 years. The sex of male volunteers is 12 people and women are 12 people. The condition is divided into 4 categories; weight, moderate, mild and cured. In the beginning, volunteers were chosen in the weight and moderate categories. Research data were medical records and interviews. The results show a gradual recovery process towards recovery. One person with an initial condition in the weight category had not recovered for 3 months of treatment. Overall there was an improvement in conditions from weight to moderate, mild and recovered. Gender has no effect on the recovery process. The conclusions of the nanogold and nanosilver case studies succeeded in alleviating to cure rheumatoid arthritis volunteers for leprosy patients. This case study has the impact give new hopes for leprosy patients to keep their spirits alive. This is very important for the future of leprosy patients free from rheumatoid arthritis. Keywords: nanogold; nanosilver; rheumatic arthritis; leprosy patient; case study. Share Link | Plain Format | Corresponding Author (Titik Taufikurohmah)

96	Chemistry	ABS-213
THE DEVELOPMENT OF WORKSHEET IN THE EXPERIMENT OF CREATING INDICATOR PAPERS FROM SAMBANG COLOK PLANTS (AERVA SANGUINOLENTA) Yuniartika1, Siti Sopiah1, Sari Sari1, and Neneng Windayani1 Pendidikan Kimia, Fakultas Tarbiyah dan Keguruan, UIN Sunan Gunung Djati Bandung Jl. A.H. Nasution No. 105, Bandung 40614, Indonesia Abstract Abstract This research aimed to describe the development of worksheet in the experiment of creating indicator papers from sambaing colok plants and analyze the results of the feasibility test on the format of the worksheet. The development phases consist of analyzing the concept of base acid and literature on indicator papers made from sambaing colok plants and creating worksheet, as research product, to be used in experiment for making indicator papers. The feasibility test was conducted on the format of the worksheet and the results have met the requirements (very valid). The average rcount score of 0,92 and the average feasibility percentage of 92% were gained from the validators. The average rcount score of 0,93 and the average feasibility percentage of 93% were gained from the students. Therefore, based on the scores, it can be concluded that the worksheet can be used by students as a learning aid when conducting experiments. Keywords: Worksheet, experiment, indicator papers, Sambang Colok Share Link | Plain Format | Corresponding Author (Sari Sari)

97	Chemistry	ABS-725
Environmental Safe Technology With the Conversion Used Cooking Oil Into Soap Sri Rahayu, Krisna Arya, Afifah, Salsabilla Tasyari, Shafiyah Rahma, Ananda Zaki Universitas Negeri Jakarta Abstract Cooking oil consumption in Indonesia is very high and tends to rise every year, reaching 500,000 tons / year. Therefore, used cooking oil is used to reduce waste cooking oil by reprocessing through purification using activated charcoal to remove color and odor. This study aims to determine the effect of NaOH concentration on the quality of soap with used cooking oil as a raw material from purified activated charcoal. This study was designed using an experimental method with descriptive analysis. The treatment in this study was the difference in NaOH concentrations of 10%, 30%, and 50% with each concentration repeated three times. The effect of NaOH concentration on soap quality was tested through the ANOVA test. The results obtained show that the most optimal NaOH concentration is 50% because it has a dense soap consistency. While the 30% NaOH concentration has a semi-solid soap consistency. At 10% NaOH concentration the consistency of soap is still liquid. It can be concluded that the concentration of NaOH affects the quality of the soap. _Keyword: soap, used cooking oil, activated charcoal, NaOH concentration_ Keywords: Soap, used cooking oil, activated charcoal, NaOH concentration Share Link | Plain Format | Corresponding Author (Krisna Arya Pambudi)

98	Chemistry	ABS-983
DETECTION OF METAL ELEMENTS WITH ICP IN JAMBI BATIK WASTE AND VIEWS AS MUSLIM EDUCATION Deliza (a*), Ahmad syukri (b), Mastarita Nova Wulanda (b), Dani Sartika (c) a) Faculty of Sains and Technolgy,Islamic State University of Sulthan Thaha Saifuddin Jambi. b) Faculty of tarbiyah and teachers c) Faculty of dakwah Abstract Batik in Jambi is located along the Batanghari river, making it easier for craftsmen to throw waste into the river. Batik waste used is an organic and inorganic dye which is difficult to be degraded naturally in the environment. The use of this dye by the batik craftsman industry has a negative impact on aquatic life, this study aims to detect the content of heavy metals and the views of Muslim intellectual. Detection of heavy metals using ICPE (Inductively Couple Plasma Emission and proven to contain inorganic compounds that contain heavy metals Cd, Co, Cr, Cu, Fe: 1,335; 1,287; 1,325; 0.877; 1,022 mg / L. As a Muslim intellectual this is a challenge that must be resolved because it is his duty and together look after and find solutions to what has happened, all the inhabitants of the earth are responsible for the care of the earth. Earth is a place where we can do good and worship in a clean, friendly place with the earth, then friendly with its contents, we associate the environment with science and religion (greendeen). Keywords: Batanghari river, Metal, ICPE Share Link | Plain Format | Corresponding Author (Deliza deliza)

99	Chemistry	ABS-984
Antibacterial activity of Vitex trifolia methanol extract against pathogenic bacteria Lalu Zulkifli 1,3,*), Muhammad Hasan Basri2) Abdul Syukur1,3) 1) Department of Sciences Education Postgraduates Mataram University 2) Student of Department of Sciences Education Postgraduates Mataram University 3) Department of Sciences Education Faculty of Teacher Training and Education Mataram University, Indonesia Corresponding author : lalu_zulkifli[at]unram.ac.id Abstract Vitex trifolia (Legundi plants) is a plant that is widely used as an ingredient of traditional medicine in Lombok Island for a variety of microbial infections. In this study, a qualitative test of V. trifolia methanol extract was shown to contain secondary metabolites, such as steroids, saponins, alkaloids, flavonoids, terpenoids, and tannins. The inhibitory test of methanol extract of roots, stems and leaves of V. trifolia against pathogenic bacteria (Staphylococcus aureus, Staphylococcus epidermidis, Escherichia coli, and Klebsiella pneumoniae) has been carried out. The experimental design used was a Completely Randomized Design. The treatment factor was the concentration of methanol extract with 4 levels (C1 = 7.5%, C2 = 15%, C3 = 30%, C4 = 60%). The extraction method used was methanol maceration, and the well diffusion method was used in antibacterial activity assay. Data were analyzed by using Anova followed by DMRT test. Anova analysis results showed that differences in the concentration of methanol extract of leaf have a significant effect in inhibiting the growth of all tested bacteria. The DMRT showed that the best treatment was with 60% methanol extract. In this study, S. aureus was the most sensitive bacterium to V. trifolia methanol extract, compared to other test bacteria. It can be concluded that the methanol extract of V. trifolia is an effective antibacterial source, especially against S. aureus. Keywords: Methanol extract, antibacterial activity, Vitex trifolia (Legundi) Keywords: Methanol extract, antibacterial, clinical isolate, Vitex trifolia (Legundi) Share Link | Plain Format | Corresponding Author (Lalu Zulkifli Zulkifli)

100	Chemistry	ABS-477
STEM Education for Chemistry in flipped classrom learning environment to Support Digitalization and Industry 4.0. Basuki Wibawa, Halimatus Syakdiyah Universitas Negeri Jakarta Universitas Negeri Jakarta Abstract The Integration of digital technologies at institutions education are profoundly influencing formal learning on global scale. This study aims to develop STEM-based learning materials in the Flipped Classroom learning environment in chemistry subjects for high school students. The method used in this research is Research and development, to develop learning materials that are compatible with chemical materials by integrating science, technology, engineering and mathematics. This research produces STEM-based learning materials in high school chemistry subjects in a flipped classroom learning environment. Keywords: STEM; Chemistry; Research and Development; Learning Materials Share Link | Plain Format | Corresponding Author (Halimatus Syakdiyah)

101	Chemistry	ABS-990
PUREE SWEET POTATO SUBSTITUTION IN WET NOODLE PROCESSING Ai Mahmudatussa’adah1*, Rijanti Rahaju Maulani2, Rita Patriasih1, Karpin1, Tati Setiawati1 1Universitas Pendidikan Indonesia, 2Institut Teknologi Bandung Abstract Wet noodles are generally made from flour and water or other additives, are formed in a typical noodle and have been through the process of boiling or steaming. Wheat flour is derived from wheat which cannot grow well in Indonesia. One of the drawbacks of wheat flour that has less natural color. Sweet potato is one source of carbohydrates with cream, yellow, orange and purple flesh. The natural color in the sweet potato has a function as a good antioxidant to maintain body health. The disadvantage of sweet potato does not contain gluten, which functions as a form of elasticity in the noodles. Thus in this research, sweet potato puree substitution will be carried out in the processing of wet noodles. The method used is an experiment with a complete random design. The results showed that the maximum amount of sweet potato puree added was highly dependent on the amount of water content of the sweet potato puree. Orange sweet potato puree has a higher water content than yellow, cream and purple flesh sweet potatoes. Comparison of the amount of sweet potato puree with 1: 1 flour, except for the orange flesh sweet potato 0.8: 1. The time of kneading and the time of the attainment of a smooth noodle dough is highly dependent on the water content of sweet potato puree. The higher water content, the longer it will take to form a smooth mixture. The addition of sweet potato puree can extend the shelf life of wet noodles in the refrigerator temperature Keywords: Ipomoea batatas L, Puree Sweet Potato, shelf life, wet noodle Share Link | Plain Format | Corresponding Author (Ai Mahmudatussaadah)

102	Chemistry	ABS-480
EDUCATIONAL NEUROSCIENCE FOR TEACHERS Basuki Wibawa, Gibran A. Wibawa, Halimatus Syakdiyah Universitas Negeri Jakarta; Universitas Negeri Jakarta; Universitas Negeri Jakarta. Abstract Educational neuroscience is developing rapidly. So many papers can be traced in various reputable international journals. When the interest of teachers to explore neuroscience begins to increase, then the answer to what is “education neuroscience” become increasingly important. This article tries to systematically study the main themes related to learning, novel neuroscience methods, new information and challenges for teaching, and How to determine a pedagogical approach that will support teachers in order to be able to support their growth in the future. Keywords: Educational Neurosciences; Pedagogical Approach; Teacher. Share Link | Plain Format | Corresponding Author (Halimatus Syakdiyah)

103	Chemistry	ABS-993
Molecular Docking Simulation of Interaction between Insulin and Silica Nanoparticle Rukman Hertadi1), Atthar Luqman Ivansyah2,3) 1) Biochemistry Research Group, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha No. 10, Bandung, West Java, 40132, Indonesia 2) Master Program in Computational Science, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha No. 10, Bandung, West Java, 40132, Indonesia 3) Analytical Chemistry Research Group, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha No. 10, Bandung, West Java, 40132, Indonesia Abstract A molecular docking study done in this research by using ArgusLab version 4.0.1 software package was used to explore the interaction between insulin and silica nanoparticle to learn the capability of silica nanoparticle as insulin carrier for targeted drug delivery system in diabetes treatment. In this molecular docking simulation, insulin was treated as ligand and silica nanoparticle was treated as binding site. This molecular docking simulation used AScore scoring function, binding sitebox size for host molecule of 20Å x 20Å x 20Å, with grid resolution of 0.4Å, docking engine of ArgusDock with high precision, no augmented torsions, flexible ligand with maximum number of poses of 200. Keywords: Molecular docking, ArgusLab, Insulin, Silica Nanoparticle, Targeted Drug Delivery System Share Link | Plain Format | Corresponding Author (Atthar Luqman Ivansyah)

104	Chemistry	ABS-744
Utilization of rabbit manure and biochar chicken manure and its effect on the growth and yield of pakchoy plants Indriyati Manu Mesa, Yohanes Parlindungan Situmeang *, Anak Agung Ngurah Mayun Wirajaya, I Gusti Bagus Udayana, Made Sri Yuliartini Faculty of Agriculture, Warmadewa University, Jl. Terompong 24 Tanjung Bungkak, Denpasar-Bali, Indonesia * E-mail: ypsitumeang63[at]gmail.com Abstract This study aims to determine the effect of rabbit manure, biochar from chicken manure and its interactions on the growth and yield of pakchoy plants. This study uses a randomized block design (RBD) with factorial patterns (2 factors). The first factor is the dose of rabbit manure (K) consisting of 4 levels (0, 10, 20, and 30 tons ha-1). The second factor is the biochar dose of chicken manure (B) consisting of 4 levels (0, 5, 10, and 15 tons ha-1). The results showed that the treatment of biochar dose of chicken manure and the treatment of interactions between the dose of rabbit manure and the biochar dose of chicken manure had no significant effect on all observed variables. The treatment of rabbit droppings did not significantly affect all observed variables, except that the fresh weight of the roots showed a real effect. Fresh weights higher than economic results obtained in rabbit manure is 30 tons ha-1 which is 60.49 g or an increase of 17.69% when compared to without rabbit manure. Fresh weights higher than economic yield found in biochar 30 tons ha-1 or an increase of 23.86% when compared to without giving biochar. Keywords: Rabbit manure, biochar chicken manure, pakchoy plant Share Link | Plain Format | Corresponding Author (Yohanes Parlindungan Situmeang)

105	Chemistry	ABS-491
Development of Protein Metabolism Electronic Module by Flip PDF Professional Application T Susanti1., F Kurniadewi1., M Nurjayadi1 1.Magister of Chemistry Education, Faculty of Mathematics and Natural Sciences, Universitas Negeri Jakarta, Jl. Rawamangun Muka, Rawamangun, Pulo Gadung, Kota Jakarta Timur, Jakarta 13220 Abstract ABSTRACT. The 21st century learning innovations must be optimized using appropriate media and learning resources. The use of technology has become an efficient alternative in the implementation of learning. This research aims to produce electronic-modules (e-modules) as teaching materials for protein metabolism using Flip PDF Professional application. The method used refers to research and development. The contents of the module are developed based upon the learning design in the Bio-molecule Metabolism course according to the curriculum of the Chemistry Education undergraduate study program. In addition, the e-module is equipped with videos, images, animations, links to various main sources and formative tests on each material in accordance with the learning outcomes over the course. Product validation is carried out by material, language and media experts using standard instruments with the Likert scale. The results of expert validation of the developed e-modules show well to very good at interpretations. Based on the results from the validation it can be concluded that the electronic metabolism protein module is ready to be used as a learning material in supporting the improvement of students critical thinking. Dissemination of the e-modules in the biochemical learning process is being carried out and will be published in the next article. Keywords: electronic module, biochemistry, protein metabolism, flip PDF professional Share Link | Plain Format | Corresponding Author (Muktiningsih Nurjayadi)

106	Chemistry	ABS-1009
Mash sweet potato as an alternative for processing sweet potato flakes Ai Mahmudatussa’adah, Ade Juwaedah, Atat Siti Nurani, Dini Maharani, Elly Lasmanawati Universitas Pendidikan Indonesia Abstract Sweet potato flakes are dried form from fresh sweet potatoes which are dried using a drum dryer. Sweet potato flakes have a dry characteristic, with a stronger color compared to fresh sweet potato flesh color. Mash is a medium-wet dishes that is usually served as a food source of carbohydrates in banquets. The purpose of this study was to analyze the sensory characteristics of sweet potato mash made from yellow, orange and purple sweet potato flakes. Stages of research include recipe analysis, and sensory evaluation. The results showed sweet potato mash can be made from sweet potato flakes with the addition of milk, cheese, salt and pepper. Keywords: Ipomoea batatas L, mash sweet potato, Sweet Potato flakes Share Link | Plain Format | Corresponding Author (Ai Mahmudatussaadah)

107	Chemistry	ABS-1015
Elastase Inhibitory Activity of Methanol Extract and n-Hexane Extract of Garcinia xanthochymus Pericarp Neneng Siti Silfi Ambarwati(a), Berna Elya(b)*, Yesi Desmiaty(c), Dwi Atmanto(a), Islamudin Ahmad(d) a) Department of Cosmetology, Faculty of Engineering, Universitas Negeri Jakarta, Jl. Rawamangun Muka, Pulogadung, Jakarta Timur, DKI Jakarta, 13200, Indonesia b) Department of Pharmacognosy-Phytochemistry, Faculty of Pharmacy, Universitas Indonesia, Depok, 16424 West Java, Indonesia c) Department of Phytochemistry, Faculty of Pharmacy, Universitas Pancasila, Jakarta, 12640, Indonesia. d) Department of Pharmaceutical Sciences, Faculty of Pharmacy, Universitas Mulawarman, Samarinda, East Kalimantan, Indonesia Abstract Garcinia xanthochymus is a plant found in Indonesia and rich in quercetin. Ethanol extract of bark can reduce LDL levels. Xanthon from the G. xanthochymus has antidiabetic activity. This study aims to determine the anti-elastase activity of n-hexane extract and methanol extract of G. xanthochymus pericarp. Samples were macerated for 1 time 24 hours using n-hexane and methanol respectively, while the elastase enzyme inhibition test used spectrophotometry methods by reacting extracts with the porcine pancreatic elastase enzyme and using the substrate N-Succ-(Ala)-3-p-nitroanilide (SANA). Absorbance was measured at wavelength of 405 nm with a microplate reader. The results showed that the concentration of 100 ppm extract of n-hexane extract of pericarp had enzyme inhibiting activity 65.17 ± 6.44%, methanol extract of pericarp 29.81 ± 10.67%, while the inhibitory activity of quercetin elastase enzyme as positive control was 62.75 + 1.89%. The conclusion of this research is that the n-hexane extract of the pericarp of G. xanthochymus has an activity as an inhibitor of the enzyme elastase is very high and can potentially be used as a material for making cosmetics. Keywords: Garcinia xanthochymus, pericarp, anti-elastase, Share Link | Plain Format | Corresponding Author (Neneng Siti Silfi Ambarwati)

108	Chemistry	ABS-507
Developing the Computer-based Test (CBT) on the Basic Chemistry throughout a Web-based Application Luki Yunita (1,4*), Muktiningsih Nurjayadi (2), Herwindo Hariwibowo (3) 1,2,3 Graduate Program of Universitas Negeri Jakarta, Jalan Rawamangun Muka, Jakarta Timur, Indonesia Negeri Jakarta 4. 4Department of Chemistry Education, Syarif Hidayatullah State Islamic University of Jakarta, Indonesia Abstract Nowadays, the development of technology emphasizes the educators to be able to utilize the technology greatly in teaching and learning processeses, including the learning assessment. In fact, the implementation of the technology, such as the utilization of an online-based test, seems to develop in the process of learning assessment. Hence, this present research proposes to develop the computer-based test (CBT) application for the comprehensive test of basic chemistry in measuring the higher order thinking skill (HOTS) of the undergraduate students in the major of chemistry education department. Furthermore, to facilitate their necessaries in optimizing the computer-based test (CBT) application, it seems to indicate that the application needs a new innovation in the certain parts in terms of the design itself and the simplicity of the online test that enables to be accessed either from the mobile phones or the students’ laptops. Notably, the development of the computer-based test application in the present research attempts to use the programming language PHP and MySQL in producing the database. Moreover, the author administrates five phases in promoting the application, such as developing the devices within the preliminary study, planning, creating the product design, testing the limited product, and revising the limited product testing. As the result, the findings of the research are expected to become the primary component in developing the online assessment. In other words, it enables to measure the learners’ competencies in comprehending the learning materials of basic chemistry and the higher order thinking skill for the undergraduate students of chemistry education department. Keywords: Application, Basic chemistry, Computer-based test (CBT), Web Share Link | Plain Format | Corresponding Author (Luki Yunita)

109	Chemistry	ABS-509
HVS Waste Paper as Low Cost Adsorbent for Pb(II) Treatment Vina Amalia (1,*), Ernawati (1), Eko Prabowo Hadisantoso (1), Yusuf Rohmatulloh (1), Ira Ryski Wahyuni (1), Adi Mulyana Supriatna (1) 1) Department of Chemistry, Faculty of Science and Technology, UIN Sunan Gunung Djati Bandung Jalan A.H. Nasution No. 105, Bandung 40614, Indonesia *vinaamalia[at]uinsgd.ac.id Abstract One way to reduce Lead (II) levels is by the adsorption process using HVS paper. HVS paper is made adsorbent because it has cellulose content in it which will bind the metal Lead (II). The purpose of this research is to study the effect of adsorbent, adsorbate concentration, contact time and pH of adsorbate absorbed in the adsorbent from HVS paper and determine the adsorption capacity (Qe) and the efficiency of adsorption (%). HVS paper adsorbents were made by turning into a pulp using a 10% w / v NaHCO3 solution, afterward, it was refluxed using 5% w / v Na2HPO4. The adsorption process was carried out using the Batch method, with a mass variation of 0.06; 0.08; 0.1; 0.12; and 0.14 g, concentration variation of 75, 90, 105, 120 and 135 ppm, contact time variation of 5, 10, 15, 20, 25 minutes, and, pH variation of 3, 4, 5, 6, and 7. Furthermore, the characteristics of the adsorbent were performed with Fourier Transform Infrared Spectroscopy (FTIR) and there was a functional group such as –OH, C–H, C = O, and C–O which helped bind the metal Lead (II) in the adsorption process. The characteristics of the adsorbent with a Scanning Electron Microscope (SEM) showed a fiber-like shape with agglomerated fine particles. In order to find out the metal content of Lead (II) that was absorbed, an analysis was carried out using Atomic Absorption Spectrophotometer (AAS). Analysis results showed the optimum adsorption of HVS paper was carried out at a mass of 0.1 g in 105 ppm meeting the Lead (II) requirements with a contact time of 10 minutes and pH of solution 5. Keywords: adsorption, HVS paper, lead(II), optimization Share Link | Plain Format | Corresponding Author (Vina Amalia)

110	Chemistry	ABS-510
Effect of Addition of White Turmeric Extract On Antibacterial Properties in Edible Film Sweet Potato Starch and Whey Protein Vina Amalia (1,*), Faisal Wahyu Adipraja (1), Asep Supriadin (1), Nisa Nur Khasanah (1), Assyifa Junitasari (1) 1) Department of Chemistry, Faculty of Science and Technology, UIN Sunan Gunung Djati Bandung Jalan A.H. Nasution No. 105, Bandung 40614, Indonesia *vinaamalia[at]uinsgd.ac.id Abstract The addition of white turmeric extract as an antibacterial to edible starch-based films aims to improve the resilience of food packaged against bacteria so that the quality is more maintained. The method carried out in this study consists of three things. The first step was the preparation and characterization of orange sweet-potato starch (including starch and moisture content). The second stage is the preparation and characterization of white Tumeric extract by phytochemical tests. The third stage is the preparation and characterization of edible films (including water resistance tests, mechanical properties tests. The result of starch characterization obtained the starch content of 43.16% with a moisture content of 13.95%. The result of the characterization of edible films by adding the best white turmeric extract was 7% with the tensile strength, and combined-successful elongation values were 40.9209 ± 2.5290 MPa and 18.03%. The results of antibacterial testing on E.Coli ATCC 11229 did not produce an inhibitory zone and on S. aureus ATCC 6538 was a clear zone but could not construct that indicates the presence of very weak antibacterial potential in edible films by adding white turmeric extract. Keywords: antibacterial; edible film; sweet-potato starch; white turmeric Share Link | Plain Format | Corresponding Author (Vina Amalia)

111	Civil Engineering	ABS-257
Strategies for Increasing Tender Success in E-tenders for Construction Projects in Jakarta Dedy Budianto, Ayomi Dita Rarasati Civil Engineering Department, Faculty of Engineering, Universitas Indonesia, Kampus UI Depok 16424, Indonesia Abstract Electronic tender or e-tendering system in the procurement of goods and services in Indonesia from the perspective of the government is considered to be a tool / instrument to realize good governance and public services, because it will increase cost efficiency, effectiveness, faster cycle times, increase package transparency tendered work, provides better public monitoring, promotes fair competition and increases government accountability. However, several tender failures occur frequently while implementing the e-tendering system in Jakartas public construction project. This research aims to determine what factors caused the failed tenders in e-tendering system for public construction projects and strategies that can be use to increase the success of tenders in e-tendering system for public construction project in Jakarta. The samples used in this study were 62 samples consisting of project owners (KPA, PPK, and PPTK), Tender Committee (Pokja UKPBJ), and contractors who have participated in tender using e-tendering system for public construction projects in Jakarta. The sampling of this research was done using a questionnaire with a nonprobability sampling technique. From the data that has been obtained, an analysis using descriptive statistical data processing methods is done with the help of the SPSS program to get the variables that often cause tender failures in the e-tender of construction projects and proceed with finding recommendations for preventive and corrective actions from various literature studies to obtain strategies for increase the success of tenders on e-tenders in construction projects in Jakarta. Keywords: failed tender, e-tender, construction projects Share Link | Plain Format | Corresponding Author (Dedy Budianto)

112	Civil Engineering	ABS-259
The Influence of Transactional Leadership and Soft Skill Project Manager to Project Success Factor Lia Mufaricha, Ayomi Dita Rarasati, Hari G Soeparto Civil Engineering Department, Faculty of Engineering, Universitas Indonesia, Kampus UI Depok, 16424, Indonesia Abstract The Indonesian government in the next 5 years will focus on infrastructure development and also human resources. The need for construction human resources is huge, considering that infrastructure development, especially for the new National Capital, can be implemented well. In the field of building construction, project implementation requires not only good scheduling, knowledge and technical skills but also human resource management. This is because the project organization involves many stakeholders, one of which is the project team. In large-scale projects with high complexity require project manager skills in leading projects to achieve goals. Leadership is a part of skill competency that is classified as soft skills for project managers. And the transactional leadership style is part of the leadership that is widely applied in Indonesia. Therefore, the authors examine the effect of transactional leadership and soft skills on project managers on the factors that influence project success in Indonesia. This research using questionnaires and addressed to construction companies in Indonesia and processed by SEM (Structural Equation Modeling) method. Keywords: Leadership, Transactional Leadership, Soft skills, Project Manager, Construction. Share Link | Plain Format | Corresponding Author (Lia Mufaricha)

113	Civil Engineering	ABS-4
Flexural Behaviour of Glulam-Concrete Composite Beams Reinforced Using CFRP Sheets Rachmat Hakiki (a*), Mujiman (b) a) Master of Applied Infrastructure Engineering, Politeknik Negeri Bandung, Jalan Geger Kalong Hilir, Ds Ciwaruga, Bandung 40012, Indonesia *rachmathakiki[at]gmail.com b) Dapartment of Civil Engineering, Politeknik Negeri Bandung, Jalan Geger Kalong Hilir, Ds Ciwaruga, Bandung 40012, Indonesia Abstract Timber bridges are difficult to produce adequate rigidity, with the application of composites can support wood as a bridge structure, namely with timber lamination technology and the addition of reinforcement using CFRP (Carbon Fiber Reinforced Polymer) in order to produce effective and efficient composite structures. The experimental study aims to analyze the strength, stiffness and ductility of flexural behaviour of glulam-concrete composite beams reinforced using CFRP sheets. The dimensions of the composite glulam timber beams 100/180 mm and concrete plate 75/300 mm with a length of 2,480 mm. The number of specimens is 4 timber composite beams-concrete plates consisting of 1 test beam without CFRP reinforcement, 1 test beam with one sheets CFRP reinforcement, and 1 test beam with two sheets CFRP reinforcement and 1 test beam with three sheets of CFRP reinforcement. Flexural testing is carried out on two simple pedestals with third point loads each placed at 1/3 span length. The test results show that the strength of laminated wood composite-beams concrete plates BC; BFRP-1; BFRP-2 and BFRP-3 respectively 81.32; 83.82; 89.32; 82.32 kN/mm; stiffness in a row 7.51; 8.22; 7.87; 6.32 kN /mm and the ductility are 16.67; 28.83; 23.16; 20.21 Keywords: Flexural Behaviour; Composite Beams; Glulam; CFRP Share Link | Plain Format | Corresponding Author (Rachmat Hakiki)

114	Civil Engineering	ABS-1030
Modeling of Operational Costs (Tipping Fee) and Inscentives to Improve Solid Waste Management Services in Indonesia Fikry Eswara Adi, Ayomi Dita Rarasati University of Indonesia Abstract Waste management needs in each region are increasing every day as a result of population growth. However, this is not supported by the ability of each region to process its own waste, so it uses a third party and pays a number of tipping fees charged to the regional budget. This tipping fee is paid to third parties in order to transport waste from one area to another. One ideal step that can be done is to do schematic calculations related to tipping fees that are adjusted to the characteristics of waste in Indonesia. To maximize the scheme, the government offers investors who want to participate so that they are able to repress the regional budget. The government in this case also estimates the total costs that will be before, during and after operations using life cycle cost analysis. The entire activity resulted in a mass decision-making decision guide for waste management in Indonesia. Local governments are expected to be able to conduct financing independently without relying on the available budget by performing tipping fees in a life cycle cost analysis. Keywords: Tipping Fee, Incentive, Solid Waste Management Share Link | Plain Format | Corresponding Author (FIKRY ESWARA ADI)

115	Civil Engineering	ABS-1032
Determination of Toll Gate Optimal Number: A Case Study of Kertosono - Kediri Toll Road in Indonesia R Endro Wibisono (a*), Soeparno (a), Muhammad Shofwan Donny Cahyono (b) a) Department of Civil Engineering, Faculty of Engineering, Universitas Negeri Surabaya, Ketintang, Surabaya, 60231, Indonesia. *endrowibisono[at]unesa.ac.id b) Program Study of Civil Engineering, Faculty of Engineering, Universitas Widya Kartika, Surabaya, 60112, Indonesia. Abstract The Kertosono-Kediri toll gate is currently under construction and operated in 2021. This toll gate is the entrance of vehicles that move from the industrial area of Mojokerto, Kertosono. For exit access this toll gate serves vehicles through the Maron Kediri toll gate, and the Sonoagung Pambon toll gate. If the toll booths operated are not in accordance with the amount of vehicle flow, it can cause poor vehicle traffic performance. The purpose of this study was to the optimal number of the gate in serving toll user transactions. The method in this study uses the number of optimal gate rules carried out by organizing data based on variable values and parameters traffic intensity per lane in the toll-gate section. These variables include the average number of vehicles received per hour and the average number of vehicles received per hour. Based on the analysis shows the number of toll booths for the Maron Kediri toll gate with 95 units/hour as many as 4 gates, 189 units/hour requires 8 gates, and 284 units/hour requires 10 gates. The Sonoagung Prambon toll gate with 118 units/hour as many as 4 gates, 236 units/hour requires 8 gates, and 353 units/hour requires 10 gates. Keywords: Queue theory, Toll roads, Optimization, Toll gate Share Link | Plain Format | Corresponding Author (R Endro Wibisono)

116	Civil Engineering	ABS-1035
Comparison The ANN Models of Penman-Monteith Potential Evapotranspiration with Combination Two Input of Climatological Data in Surabaya Danayanti Azmi Dewi Nusantara(*); Feriza Nadiar Department of Civil Engineering, Faculty of Engineering, Universitas Negeri Surabaya, Ketintang, Surabaya, Indonesia. *danayantinusantara[at]unesa.ac.id Abstract In Surabaya, as a part of the equatorial region, determine the rate of daily potential evapotranspiration (PET) turns into a requirement. Along with, during the scarcity season, the rate of PET significantly increases for certifying the water availability. The amount of PET advance into decisive for water supply cases such as irrigation, water supply, hydropower, and other. The PET model founded from several inputs of climatological data that are relative-humidity, wind speed, average daily temperature, and the duration of sun exposure. As a caution, modeling a PET through prolonged and complicated steps. To simplify the development of modeling PET, this research using Artificial Neural Network (ANN) based on data-driven modeling. The PET-ANN model intends to match the PET estimated with Penman-Monteith (PM). This research purpose of learning what the best combination of two climatological data as an input to the PET-ANN model. The perform MSE and R on the validating process of PET-ANN present how the different results come. The results show the best combination of two climatological data from the entire data set as an input. The conclusion is that the combination of relative humidity and wind speed as an input to the PET-ANN presents the best result than other combinations of climatological data. Besides, it approves that the relative humidity and wind speed as an undoubted input to the PET model even using ANN or not. Keywords: Potential Evapotranspiration, Artificial Neural Network, Climatological Data Share Link | Plain Format | Corresponding Author (Danayanti Azmi Dewi Nusantara)

117	Civil Engineering	ABS-780
Enveloping Transmission Tower Conductor Line 150 kV Siantan-Sei Raya Kalimantan Using Rubber Silicon Prasetyo Adi Wibowo1, , Rasgianti 2 , and Bernaded Oka A3 1,2,3PLN Reaserch Institute, 102 Duren tiga Street Jakarta, Indonesia Abstract This study aims to determine the feasibility of the tower structure against the enveloping of silicon rubber. The analysis was done by modeling using MS Tower software, by comparing the stress ratio of the existing conditions with the addition of silicon rubber. Tower geometry data is taken based on field measurements because as built drawings are not available. Load combinations simulated with conditions; a) Normal conditions (service conditions); b) Variation of two broken lead wires; and c) normal combination with wind. Wind loads speeds of 10 mph, 15 mph and 20 mph and are simulated from different directions. The results modeling on MS tower, The addition of silicon rubber obtained an increase in the stress ratio on the tower structure by 0.035 compared to before the addition (existing conditions). The greatest stress ratio is obtained when normal load conditions are combined with wind. At a wind speed of 10 mph the tower condition is safe because it is still far from the permit voltage limit. Furthermore, when the wind speed is 15 mph, the voltage ratio that occurs begins to approach the value of 1 (almost close to the permit voltage). While at a wind load of 20 mph, an indication of failure on the tower begins, which is shown from the results of the analysis having a voltage ratio> 1. Based on these results, the enveloping of silicon rubber can be carried out with wind conditions smaller than 20 mph. Keywords: transmission tower, silicon rubber, MS Tower Share Link | Plain Format | Corresponding Author (Prasetyo Adi Wibowo)

118	Civil Engineering	ABS-14
Prediction sesimic performance of low-rise SMRF with varying number of bays using nonlinear procedures Daniel rumbi teruna (1), Joshua kenny (2) 1Associate Professor, University of Sumatera Utara, Jl. Dr. T. Mansyur No. 9, Medan, Indonesia 2Undergraduate Student, Bandung Institute of Technology, Jl. Ganesha No. 10, Bandung, Indonesia Abstract Abstract. This paper presents the seismic performance of three-story reinforced concrete (RC) structures under four selected ground motions. To account for the effect of sequential yielding of hinge regions on seismic performance, different number of bays are considered, from a 1-bay system to a 5-bay system. All structural models are designed as special moment resisting frame (SMRF) according to the Indonesian building code. The four ground motions are scaled with spectral matching method in frequency domain, i.e., Elcentro, Sylmar, Northridge, and Tabas to be compatible with the design response spectrum of the Indonesian seismic code. First, a nonlinear static procedure (NSP) is performed according to the coefficient displacement method of ASCE 41-17 to determine yield strength and maximum roof displacement of the structural models. Then, a nonlinear response history analysis (NTHA) is carried out by using Newmark’s integration method to obtain interstory drifts and hysteretic energy demand. Rayleigh damping is then constructed using a damping ratio of 0.05 for the first and second mode. Furthermore, Park and Ang’s damage index is evaluated for all structural models. Based on the interstory drift, damage index, and performance point, the seismic performance of the structural models is evaluated and compared. Keywords: Seismic performance, interstory drift, plastic hinge,nonlinear anlysis Share Link | Plain Format | Corresponding Author (daniel rumbi teruna)

119	Civil Engineering	ABS-270
Storage Capasity Analysis of Nipa Nipa Regulation Pond Using Ripple Method 1Satriani, 2Rita.Lopa, 3F.Maricar 1.Magister Course Student of Civil Engineering Department, Hasanuddin University, Jl. Malino, Borongloe, Bontomarannu, Kabupaten Gowa, Sulawesi Selatan 92119. 2.Associate Professor of Civil Engineering Department, Hasanuddin University, Jl. Malino, Borongloe, Bontomarannu, Kabupaten Gowa, Sulawesi Selatan 92119 3.Associate Professor of Civil Engineering Department, Hasanuddin University, Jl. Malino, Borongloe, Bontomarannu, Kabupaten Gowa, Sulawesi Selatan 92119 Abstract An Abstract. Tallo River has the potential to pose a threat of flooding because it is strongly influenced tide. Regulation Ponds are flood control structures built upstream from areas that will be protected from flood hazards. Storage Capasity Analysis of Nipa Nipa regulation pond using Ripple method. Flood routing results obtained a maximum of 4.032.440,62 m3, while topographic conditions obtained a maximum of 4.566.160,40 m3 then optimization analysis based on the Ripple Method obtained with volume accommodated during 1980-1984 is 2.508.330,462 m3, during 1985- 1989 is 2.158.594,429 m3, during 1990-1994 is 1.721.928,984 m3, during 1995-1999 is 2.072.035,680 m3, the volume accommodated during 2000-2004 is 2.526.941,033 m3, volume accommodated during 2005-2009 is 1.996.205,351 m3 and volume accommodated during 2010-2014 is 1.913.798,405 m3. This shows that storage capacity of regulation Pond can serve to reduce flood in Tallo River. Based on the cumulative storage storage analysis, a maximum storage of 10.592.032,714 m3 obbtained from the inflow and outflow analysis, indicating that the Nipa Nipa regulation pond was able to reduce flood in amount of 38,07 % ie 4.032.440,62 m3 Keywords: Flood; Storage; Ripple Method Share Link | Plain Format | Corresponding Author (SATRIANI S.T)

120	Civil Engineering	ABS-18
Optimization of Production Process Precast Concrete Product Box Girder (Case Study at PT Wika Beton) Verly Widiantoro, Leni Sagita Riantini, And M. Ichsan Damiat Department of Civil Engineering, Faculty of Engineering, Universitas Indonesia Abstract Infrastructure is one important element in a countrys development. The number of bridge infrastructure projects that can increase the growth of the construction industry in Indonesia must be supported by construction technology as well as the use of precast concrete. In its development, Wika Beton seeks to optimize the production process of precast products produced to prevent delays in production so that it can serve the needs of construction projects completed on time even when accelerating construction time is needed. One of the precast products produced by Wika Beton is a box-shaped bridge girder called Box Girder. The purpose of this study is to identify, analyze the current production of precast concrete box girder products, make the production process of precast concrete box girder products effective and efficient and optimize the production process of precast concrete box girder products to improve time performance. Keywords: Optimization; Production; Box Girder; Precast Share Link | Plain Format | Corresponding Author (Verly Widiantoro)

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