Indonesia Conference Directory

Corresponding Author
Neneng Siti Silfi Ambarwati

Institutions
1Department of Cosmetology, Faculty of Engineering, Universitas Negeri Jakarta, Jl. Rawamangun Muka, East Jakarta, 13220, Indonesia
2Department of Phytochemistry, Faculty of Pharmacy, Universitas Mulawarman, Samarinda, Kalimantan Timur, Indonesia

Abstract
Background. Pidih is a cosmetic used on Javanese bride-s foreheads called paes. Peel material that is commonly used is wax which is colored as desired and has easy sticking properties. Objective. The objective of this research is to provide an alternative use of natural ingredients for pidih that used on the brides forehead makeup. Methods. Experiment was conducted to obtain black powder made from recycled dried coconut leaves and olive oil with the appropriate composition, and then applied as paes in the Solo putri style bride. Results. The use of cosmetics with natural ingredients, the leaves of dried coconut and olive oil, produce black, shiny, easily painted on the forehead, and rather oily. The cosmetic material can be used as an alternative for pidih that is made of wax. Conclusion. Alternative boiling from the ash of dried coconut leaves can be used as a substitute for conventional pidih.

Keywords
pidih, dried coconut leaf, olive oil, forehead makeup, bride

Topic
Chemistry

Link: https://ifory.id/abstract/9yYJQVvmu8wx

Corresponding Author
Rahmi Rahmi

Institutions
Chemistry Department, Syiah Kuala University, Darussalam, Banda Aceh, 23111, Indonesia.
*rahmi[at]fmipa.unsyiah.ac.id

Abstract
Cellulose from grass (imperata cylindrica) had been used as reinforcement in chitosan film preparation. Cellulose was obtained from grass through hydrolysis process. Hydrolysis was conducted with different concentration of sulfuric acid at room temperature for 2 h. The results show that the highest crystallinity of cellulose was obtained at sulfuric acid concentration of 40% (v/v) on hydrolysis process. The isolated cellulose with the highest crystallinity was used on chitosan film preparation. Mechanical test shows addition of cellulose into chitosan film improved the tensile strength. The FTIR analysis was used to define the interaction between components. XRD analysis shows the addition of cellulose decrease the crystallinity of chitosan film.

Keywords
chitosan film; cellulose; grass; hydrolysis; crystallinity; tensile strength

Topic
Chemistry

Link: https://ifory.id/abstract/6upAVg2xUNKE

Corresponding Author
Maria Paristiowati

Institutions
a) Department of Chemistry Education, Faculty of Mathematics and Natural Sciences, Universitas Negeri Jakarta, Jakarta 13220, Indonesia
* maria.paristiowati[at]unj.ac.id
b) Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia

Abstract
Green Chemistry principal was introduced in an academic environment in the 1980s as guidelines for sustainable development focused on chemistry. Efforts to realize these expectations can be applied through education by developing learning process based on environmental. This study aims to apply the concept of Green Chemistry in education, especially chemistry learning by producing natural acid-base indicators from the extract of roses (Rosa sp) and Rosella (Hibiscus sabdariffa L). These indicators are produced by the method of extraction using 96% ethanol solvent in an acidic atmosphere at pH 3-4. The results of maceration then extracted in three different solvents (ethanol, n-hexane, and chloroform). The extract was tested in solution with pH 1-12 and used as an indicator to identify the solutions and titration in acid-base topic. It concluded that the roses and Rosella can be used as an alternative raw material for acid base indicator. The use of roses and Rosella indicates an attempt to have applied the principles of green chemistry, including the prevention of the formation of hazardous wastes, the design of safe chemical products, the use of renewable materials, the design of materials that are easily degraded, and the use of safe solvents.

Keywords
Green chemistry; acid-base indicator; sustainable development

Topic
Chemistry

Link: https://ifory.id/abstract/fAV9zgcZPvN4

Corresponding Author
Nunung Kurniasih

Institutions
(a)Department of Chemistry, Faculty of Sciences and Technology, Sunan Gunung Djati Islamic State University, Bandung 40614, Indonesia
(b)Department of Chemistry, Faculty of Mathematics and Natural Sciences,Universitas Padjadjaran, Jatinangor 45363, Indonesia
(c)Department of Pharmacology and Clinical Pharmacy, Faculty of Pharmacy,Universitas Padjadjaran, Jatinangor 45363, Indonesia
(d)Central Laboratory of Universitas Padjadjaran, Jatinangor 45363, Indonesia
(e)School of Chemical Sciences, Universiti Sains Malaysia,11800 Minden, Penang, Malaysia
* Corresponding author: nunungkurniasih[at]uinsgd.ac.id

Abstract
Previous phytochemical studies from the Aglaia genus reported the presence of terpenoid compound. This research describe the isolation and structure elucidation of sesquiterpend compound from the stembark of Aglaia simplicifolia. Dried stembark of A. simplicifolia extracted with methanol and then partitioned with n-hexane, ethyl acetate, and n-butanol, respectively. The n-hexane extract then was separated and purified with chromatography techniques to obtain isolated compound. The chemical structure of isolated compound were elucidated by IR, NMR 1D, NMR 2D as well as mass spectra and by comparison with those previously reported spectra data. The compound identified as senecrassidiol.

Keywords
Aglaia simplicifolia, stembark, senecrassidiol.

Topic
Chemistry

Link: https://ifory.id/abstract/c2EvpJy6n4Fx

Corresponding Author
Mirsa Umiyati

Institutions
Universitas warmadewa

Abstract
The purpose of this study was to get one of the right time to trim the shoots and giving the urine more often given will be able to give effect to the growth and yield of melon plants both the best quality and quantity as well as the increasing income of melon farmers. This research is a factorial experiment, with a randomized block design (RCBD) basic design with 2 factors tried and carried out in a greenhouse from June to September 2018. In the first factor, shoot pruning consists of 3 levels: P 1 = pruning shoot 7 days, P 2 = pruning 14 days, P 3 = pruning buds 21 days. The second factor with 4 levels of giving rabbit urine: U 0 = without being given urine, U 1 = giving urine every 3 days, U 2 = giving urine once every 6 days, U 3 = giving urine once every 9 days. From the experiment there will be 12 combination treatments and will be repeated 3 times so that there are a total of 36 combination treatments. The data obtained were analyzed by analysis of variance and continued with a 5% BNT or Duncan distance test. The interaction (P x U) between setting the shoot pruning time (P) and giving rabbit (U) urine to the growth and yield of melon (Cucumis melo L.) plants on all influential variables was not significant (P≥0.05). Fruit weight per plant due to setting the shoot pruning time gave the highest weight obtained at P 1 of 1555.21 g which was not significant with P 2 having a weight of 1452.81 g and significantly different from P 3 which was 1412.34 g. The treatment of P 1 each increased by 7.05% and 10.12% against P 2 and P 3. The results of this study showed that the highest fruit weight was obtained when pruning 7 days after planting (P1) supported by 256 plant height, 75 cm, number of lateral shoots 16.92 pieces, number of leaves 80.42 strands, leaf area 14242.72 cm2, leaf wet weight 376.29 g, wet weight of stem and lateral shoots 190.22 g, root wet weight 19.89 g, leaf dry weight 133.03 g, root dry weight 15.36 g, fruit dry weight 298.03 g. Fruit weight per plant on U 1 urine administration with the interval of giving once every 3 days showed the highest value of 1568.88 g different not significant with U 2 and U 3 each of 1482.42 g 1474.36 g. U1 treatment when compared with U 0 without urine administration was significantly different with a value of 1368.17 g, an increase of 14.67%. The high weight of fruit treated urine administration time once every 3 days (U 1) supported by variable plant height 265.17 cm, number of lateral shoots 17.44 pieces, number of leaves 87.88 strands, leaf area 15,590.13 cm2, wet weight of leaves 399 11 g, the wet weight of the stem and lateral shoots 201.71 g, root wet weight 21.66 g, root dry weight 16.02 g, fruit dry weight 322.28 g in treatment U 1 and all had significant effect with maximum value.

Keywords
Pruning time, rabbit urine, melon plants

Topic
Chemistry

Link: https://ifory.id/abstract/C6KTc8zHeqFf

Corresponding Author
Sari Sari

Institutions
1,2,3,4 Prodi Pendidikan Kimia Universitas Islam Negeri Sunan Gunung Djati Jl. A.H. Nasution No. 105, Bandung 40614, Indonesia
5 Prodi Pendidikan Agama Islam Universitas Islam Negeri Sunan Gunung Djati Jl. A.H. Nasution No. 105, Bandung 40614, Indonesia

Abstract
The purpose of this study is to determine alkali metal content by means of flame using smartphone application with experiment. Method stages are performed by making a standard solution and test solution first. Standard solution for determining density line equations to vector norm value. While the test solution is to determine the known concentration of NaCl from the line equations. The standard solutions of each RGB value is tested to get an equation with the value gradient must be close to or equal to 1. The analysis shows that the use values of RGB obtained from a captured image of the video is the color intensity resulting from the flame sodium metal. Level of the standard solution 1 shows result that is quite accurate with test solution levels of 0.0313 g/mL. Likewise with standard solution 2, the result is 0.0063 g/mL and standard solution 3 is 0.00032 g/mL. The value of gradient of the standard solutions must have a value close to or equal to 1. This is because the value of gradient affects the concentration results obtained. If gradient has a value that is very close to 1, an accurate result will be obtained.

Keywords
smartphone, Alkali, Flame tests, RGB Color Detector

Topic
Chemistry

Link: https://ifory.id/abstract/EehzxqjCRKPp

Corresponding Author
I Dewa Ketut Sastrawidana

Institutions
Undiksha

Abstract
The use of agrochemical such as fertilizers and pesticides intensively on agriculture sector contributes to the increase of heavy metals residual in soil and vegetables. Lead (Pb) and Cadmium (Cd) are two types of heavy metal considered toxic, carcinogenic for living organism and persistence in environment. Pb and Cd metals are frequently found as impurities in fertilizer products. Our researches focused on the speciation of Pb and Cd heavy metals on soil which cultivated vegetables. In addition, soil characteristic (organic matter content, pH and cation exchange capacity) as a factor influencing heavy metal speciation and bioavailability for plants also analyzed. Beside that, measurement of Pb and Cd content on several types of vegetables such as tomatoes, cabbage and carrots are conducted then used to determine the level of safety for consumed. Heavy metals speciation carried out using sequential extraction method then the Pb and Cd content on each fraction was analyzed by atomic absorption spectrophotometer. Heavy metal of Pb in various fraction are in the following order F3> F1> F5 > F4>F2 whereas heavy metal of Cd order F4> F1>F3>F5>F2. The organic matter, pH and cation exchange capacity on sample soil was 3.05% ; 5.56 and 20.30 mek/100 g, respectively. The health risk values of daily intake of metal (DIM) and health risk index (HRI)<1 indicates that the vegetables was relatively safety for consumed.

Keywords
Cadmium, lead, farmland, fertilizer, health risk index, heavy metals speciation.

Topic
Chemistry

Link: https://ifory.id/abstract/MXDL9UY6r2eV

Corresponding Author
Nunung Kurniasih

Institutions
(a)Department of Chemistry, Faculty of Sciences and Technology, Sunan Gunung Djati Islamic State University, Bandung 40614, Indonesia
(b)Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Jatinangor 45363, Indonesia
(c)Department of Pharmacology and Clinical Pharmacy, Faculty of Pharmacy, Universitas Padjadjaran, Jatinangor 45363, Indonesia
(d)Central Laboratory of Universitas Padjadjaran, Jatinangor 45363, Indonesia
(e)School of Chemical Sciences, Universiti Sains Malaysia,11800 Minden, Penang, Malaysia
* Corresponding author: nunungkurniasih[at]uinsgd.ac.id

Abstract
Two steroid compounds, ergosterol peroxide (1) and stigmasterol (2) have been isolated from the stembark of Aglaia simplicifolia belong to Meliaceae family. The chemical structures of 1 and 2 were identified on the basis of spectroscopic evidence including UV, IR, NMR 1D, NMR 2D as well as mass spectra and by comparison with those previously reported spectra data. The cytotoxic effects against HeLa cervical cancer cell lines of the extracts and compounds were studied.

Keywords
Aglaia simplicifolia, steroid, HeLa cervical cancer cell lines.

Topic
Chemistry

Link: https://ifory.id/abstract/brjkAHTPwxeX

Corresponding Author
Yuli Rahmawati

Institutions
(a)Jl Rawamangun Muka, Jakarta Timur
Universitas Negeri Jakarta
*yrahmawati[at]unj.ac.id

(b) SMA Bakti Mulya 400
Jl. Lingkar Selatan, Pondok Pinang,
Jakarta Selatan 12310

(c)Arief Setiawan
SMP Pembangunan
Jl. Pengayoman III No. 95, Utan Kayu Utara
Jakarta Timur

Abstract
The paper portrays the study of the integration of ethnopedology in wastewater treatment project to engage science students in learning environmental pollution. The study involved two classes in junior high school in Jakarta. The cultural practices in dealing with environmental pollution from five regions of Jakarta, Bandung, East Java, Central Java, and Banten have been integrated into the study. The qualitative research with multiple data collection of reflective journal, interviews, and science concept test. The project of wastewater treatment has been developed through the information of indigenous knowledge which has been explored. The results show that the ethnopedagogy integration in science learning has engaged students in understanding their cultural identity and developing their problem solving, critical and creative thinking skills. The science of conceptual understanding has been developed throughout the learning experiences. In addition to students have developed their skills in communication and collaboration with completing the project. The students faced the challenges of shifting their identity from passive to active learners within meaningful and enjoyable learning experiences.

Keywords
ethnopedagogy, science learning, environment pollution, wastewater treatment project, students engagement

Topic
Chemistry

Link: https://ifory.id/abstract/fEq2NuKFgzXU

Corresponding Author
Hasri Hasri

Institutions
1) Chemistry, Faculty of mathematic and natural sciense , Universitas Negeri Makassar
2) Biology, Faculty of mathematic and natural sciense , Universitas Negeri Makassar
3).Alumny chemistry, Faculty of mathematic and natural sciense , Universitas Negeri Makassar

Abstract
Abstract Synthesize ZnO-Activated Carbon (ZnO-AC) use the time, concentration, pH degradation Acid Orange 7 dyes. The stages preparation of synthesize included sample preparation, making shell activated carbon candlenut, ZnO-KA characterization and degradation study.. SEM-EDX analysis results showed an uneven morphology with a percentage of ZnO mass of 58.46%. ZnO-KA degrade Acid Orange 7 for 8 hours with a concentration of 50 ppm and at pH alkali obtained percentage degrade of 96.23%. Key words: Degradation, Acid Orange 7, ZnO-KA

Keywords
fotodegradasi, Acid Orange 7, ZnO-Karbon Aktif (ZnO-KA)

Topic
Chemistry

Link: https://ifory.id/abstract/EmVfubnv4XZ6

Corresponding Author
Henry Setiyanto

Institutions
1Analytical Chemistry Research Group, Institut Teknologi Bandung, Bandung, Indonesia
2Research Unit for Clean Technology, Indonesian Institute of Sciences, Bandung, Indonesia
3Department of Physics, Universitas Negeri Malang, Malang, Indonesia

Abstract
Methylene Blue (MB) is a dye commonly used in the textile industry. Dyes waste from the textile industry harms the ecosystem of the environment. One method of textile dye waste degradation is mediated electrochemical oxidation. This method uses an oxidation-reduction process using metal ion as a mediator. The mediator metal ion acts as an oxidizer which oxidizes textile dyes waste into simpler compounds, namely CO2 and H2O. The mediator ion used in this study was Ce (IV) in an acidic. The results of the degradation were analyzed using the voltammetry method. In voltammetry there are three electrodes are used, namely working electrode, reference electrode, and auxiliary electrode. This study used a carbon paste electrode as a working electrode, a platinum wire as an auxiliary electrode and a homemade Ag/AgCl as a reference electrode. The results of the characterization of the Ag/AgCl reference electrode showed that the Ag/AgCl had the same characteristics as the BAS commercial reference electrodes (bioanalytical systems). The results of cyclic voltammogram showed that the oxidation potential value of MB is 0.2880 V. The oxidation and reduction potential of Ce (III)/Ce (IV) in 0.2 M H2SO4 were 1.2400 V and 0.4520 V. This potential value indicates that the MB oxidation potential was not disturbed by the mediator ion potential. The optimum condition of electrodegradation was obtained at 250 ppm MB in 0.2 M H2SO4 with the addition of 0.015 M Ce (III) for 30 minutes using the potential of 6 V.

Keywords
Methylene Blue, MEO, degradation, cerium

Topic
Chemistry

Link: https://ifory.id/abstract/fngw7ar4xJpy

Corresponding Author
Delita Ega Andini

Institutions
a) Mining Engineering, Faculty of Engineering, Universitas Bangka Belitung, Merawang, Bangka 33172, Indonesia
*delitaegaandini[at]gmail.com
b) Chemistry, Faculty of Engineering, Universitas Bangka Belitung, Merawang, Bangka 33172, Indonesia

Abstract
Rare earth element (REE) is a material that is quite attractive to the defense sector and the modern high biotechnology production material industry. In Indonesia, one of the rare earths comes from the association of rare earth elements with acidic rocks (granitic) and phosphatic deposits. In the acid rock environment, REE deposits are found as associated minerals in placer tin mining such as monazite and xenotime in Bangka Island. This research was conducted at an active tin mine on land and at sea in Bangka Island. There are several sampling locations including primary tin mines and alluvial tin mines on land and at sea. Samples taken came from tailings in the process of washing tin ore using jigs in tin mining. Samples taken were then analyzed using X-Ray Fluorescence (XRF) to find out how much REE content was in each sample. In tin mining in the sea, the element of cerium (Ce) is dominant, which is 10718.11 ppm or 1.07% found in the tailings sample in the sluice box at the sea mining site Air Kantung Sungailiat using production suction vessel. Whereas in tin mining on land the element cerium (Ce) also became the dominant element, which is 481.23 ppm or 0.04% in Pemali area which is the primary tin deposit.

Keywords
Rare earth elements; Tin tailing; Bangka Island

Topic
Chemistry

Link: https://ifory.id/abstract/LypDFrxRPUcb

Corresponding Author
Arif Rahman

Institutions
1 Universitas Negeri Jakarta
2 Universitas Indonesia
3 Unika Atmajaya Jakarta

Abstract
The synthesis of LTA zeolite from kaolin Bangka using hydrothermal method at low temperatures has been reported. Kaolin was converted into metakaolin by calcinaton process at a temperature of 750 °C for 2 hours then hydrothermal subsequently process at 60 ° C for 5 hours in a NaOH 3M solution. Characterization by using XRD provides information on changes from the crystalline to amorphous phase in the conversion of kaolin to metakaolin to complete and the formation of LTA zeolite after hydrothermal. SEM provides information on morphological changes that are typical for Kaolin, metakaolin and zeolite LTA. Changes in functional groups were also observed in the samples observed using FTIR spectroscopy. From these characterizations, it can be concluded that successfully synthesized LTA zeolite from Kaolin Bangka with high crystallinity using a simple method.

Keywords
Zeolite LTA, Kaolin, metakaolin

Topic
Chemistry

Link: https://ifory.id/abstract/KzUFTv3DHRYy

Corresponding Author
Asyifa Rizqi Utami

Institutions
a) Laboratory of Analytical Chemistry, Bandung Institute of Technology, Jalan Ganesha 10, Bandung 40132, Indonesia
asyifarizqi[at]students.itb.ac.id
b) Analytical Chemistry Research Division, Bandung Institute of Technology, Jalan Ganesha 10, Bandung 40132, Indonesia
zulfikar[at]chem.itb.ac.id
c) Organic Chemistry Research Division, Bandung Institute of Technology, Jalan Ganesha 10, Bandung 40132, Indonesia
deana[at]chem.itb.ac.id

Abstract
A novel magnetic molecularly imprinted polymer (MMIP) was prepared for the recognition of di(2-ethylhexyl) phthalate, using methacrylic acid as a functional monomer, ethylene glycol dimethacrylate as a crosslinker and benzoil peroxide as an initiator. MMIP was characterized using Scanning Electron Microscope and infrared spectrophotometer. IR spectrum show successfull preparation of MMIP. The peak at 586 cm-1 is a typical vibration of Fe-O. The strong peaks at 1728 cm-1, 1261 cm-1 and 1153 cm-1 correspond to the C=O stretching vibration and C-O vibration of methacrylic acid and DEHP. The peak at 1462 cm-1 corresponds to C-C aromatic vibration of DEHP. A broad absorption band at 3468 cm-1 correspond to the stretching vibration of O-H bonds. Experimental results show the potential of magnetic molecularly imprinted polymer for selective recognition of di-(2-ethylhexyl) phthalate.

Keywords
di(2-ethylhexyl) phthalate, imprinted polymers, magnetite

Topic
Chemistry

Link: https://ifory.id/abstract/YvJpfDPZ2jAm

Corresponding Author
Citra Deliana Dewi Sundari

Institutions
1Department of Chemistry Education, UIN Sunan Gunung Djati Bandung, Jl. Cimincrang, Cimenerang, Panyileukan, Bandung, West Java, 40292, Indonesia.
2Department of Chemistry, Faculty of Science and Technology, UIN Sunan Gunung Djati Bandung, Jl. A.H. Nasution No.105 Bandung, West Java, 40614, Indonesia.
3Master Program in Computational Science, Faculty of Mathematic and Natural Science, Institut Teknologi Bandung, Jl.Ganesha No. 10, Bandung, West Java, 40132, Indonesia

Abstract
Silicalite-1 is a type of zeolite with no aluminum content and is hydrophobic. This zeolite can be synthesized from various types of silica. Elephant grass (Pennisetum purpureum) is one of the potential agricultural wastes that has a fairly high silica content that can be used for zeolite synthesis. In this study, silicalite-1 zeolite was synthesized using silica extracted from elephant grass and tetrapropilammonium bromide (TPABr) templates. Silica samples extracted from elephant grass have 71.91% amorphous SiO2 content. Silicalite-1 zeolite was synthesized with mole ratio of 1SiO2 : 0.527TPABr : 0.395Na2O : 98.45 H2O, using hyrothermal method at 180°C for 24 hours in a stainless steel-teflon lined autoclave. The resulting silicalite-1 samples were confirmed by X-Ray Diffraction (XRD) and showed 2θ which was typical for silicalite-1 i.e. 8.02°, 8.93°, 23.09°, and 23.98°. The results of Scanning Electron Microscopy (SEM) show that silicalite-1 zeolite has hexagonal crystals with 43.36 µm size as a result of the calculation using the Schrerrer method.

Keywords
silica isolation; amorphous silica; elephant grass; tetrapropilammonium bromide; silicalite-1 zeolite

Topic
Chemistry

Link: https://ifory.id/abstract/UTkpz7df4EAw

Corresponding Author
Dini Handayani

Institutions
Universitas Pendidikan Indonesia
Jl. Dr. Setiabudhi No. 229 Bandung 40154 Jawa Barat - Indonesia
Sekolah Pascasarjana Prodi Pendidikan Khusus

Abstract
The research aims to find out how to teach how to measure acidity using universal indicators on instant drinks at a stall near the school for deaf SMALB students. This research method uses a single subject approach, namely in special schools in Bandung Regency in the SMALB Tunarungu unit whose students are four people. Retrieval of data using pre-test and post test. Teaching with total communication and demonstration. The results of the study show that teaching how to measure acidity can be given to deaf students by demonstrating and explaining clearly the function of acidity indicators. The key to teaching deaf students is to provide a detailed explanation of each word given.

Keywords
Acidity, Universal Indicator, Deaf

Topic
Chemistry

Link: https://ifory.id/abstract/wZY9yPu4G7RU

Corresponding Author
Avidlyandi Avidlyandi

Institutions
1. Program Studi Magister Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Bengkulu. Jalan W.R. Supratman, Kandang Limun, Bengkulu, 38371, Indonesia.
2. Jurusan Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Bengkulu. Jalan W.R. Supratman, Kandang Limun, Bengkulu, 38371, Indonesia
* morina[at]unib.ac.id; morinaadfa[at]yahoo.com

Abstract
Antitermite activity methanol extract of lichen Teloschistes flavicnas (SW) Norman was investigated in the laboratory scale. No-choice test was used as method with 5 concentrations tested of 1.25%, 2.5%, 5.0%, 6.25% and 7.5% b/v. The termiticide activity showed that the mortality of termites was increased every day as well as the concentration of the extract increased, at the concentration of 7.5% all termite dead at fourth days. Termiticide activity of methanol extract of T. flavicans was influenced by the GC-MS data that showed 78 chemical components. Vicanicin, methyl oleate, methyl palmitate, and patchouli alcohol was detected as major components that be expected as termiticide. T. flavicans might be possible as a botanical termiticide in the near future.

Keywords
Termiticide activity, T. flavicnas, C. curvignathus, GC-MS, patchouli alcohol

Topic
Chemistry

Link: https://ifory.id/abstract/JphgPMuVwRrG

Corresponding Author
Rochmat Aldy Purnomo

Institutions
(a)Nursing Department, Faculty of Health Sciences, Universitas Muhammadiyah Ponorogo
(b)Department of Biomedical Sciences, College of Life Sciences, Ritsumeikan University, Kusatsu, Shiga, Japan

Abstract
Cantaloupe is often used in hypertension therapy. But it is not yet known the mechanism of action of cantaloupe in lowering blood pressure also has no known potential toxicity if consumed in the long term. This study analysed the antihypertensive mechanism of cantaloupe and its toxic potential through the bioinformatics approach. A total of 200 grams of dried cantaloupe powder was maserated using 3 liters of absolute methanol and stored at 4oC. The phytochemical test was done by the LC-MS method, the bioactive compounds from LC-MS were traced to their SMILES in the PubChem. SMILES was used for the analysis of the antihypertensive potential in the PASSonline and the toxicity class and hepatotoxicity in the ProTox-II. The mechanism of compounds toxicity was analysed using STITCH and STRINGdb. The binding affinity between the bioactive compound and the target protein was analysed by molecular docking using PyRx and Discovery Studio. The results showed that at least 434 types of compounds were shown in cantaloupe methanol extract. Based of the STITCH and STRINGdb analysis, the cantaloupe may reduce blood pressure through the performance of amlodipine in the calcium channel pathway that controls contraction and relaxation. Among the compounds in cantaloupe extract, there were 4 compounds with the highest toxicity class, namely nitrofurazone, diphenadione, neosaxitoxin, and furazolidone. Nitrofurazone and furazolidone work on the hormone production system, nervous system, and gene expression. Some compounds were also thought to have hepatotoxic potential, including efavirenz and itraconazole which act on the cytochrome P450 pathway.

Keywords
Antihypertensive, Toxicity Potential, Cantaloupe (Cucumis melo var. cantalupensis), Methanol Extract

Topic
Chemistry

Link: https://ifory.id/abstract/UWD8FgmzQ7C2

Corresponding Author
Anny Eka Pratiwi

Institutions
Faculty of Medical and Health Science, Warmadewa University, Denpasar, Bali (1)
Faculty of Sains, Health, ant Technology, Dhyana Pura University, Badung, Bali

Abstract
A research on the analysis of water quality and hotel liquid waste in Ubud regency, Gianyar-Bali has been conducted. The analysis of raw water quality was done to discover whether the raw water can be appropriately classified as clean water. The parameters used in analyzing the raw water are its bacteriological and hardness level. Analysis on the quality of liquid waste was done discover whether the hotel liquid waste can still be categorized align with the government standard in the disposal to the surrounding environment. Based on the result of hotel raw water analysis, five samples have aligned with the clean water standard, which is possible to categorized as clean water; while for the analysis of hotel liquid waste, the parameters used are turbidity, pH, BOD, COD and bacteriological test. The analysis shows that four hotels have exceeded the reasonable level of waste, where scheduled surveillance is required in keeping the environment away from waste disposal.

Keywords
raw water, hotel waste, pH, turbidity, hardness, BOD. COD, bacteriological.

Topic
Chemistry

Link: https://ifory.id/abstract/YayAr7UXCkN4

Corresponding Author
Manihar Situmorang

Institutions
Universitas Negeri Medan

Abstract
The design of sensitive, selective and reproducible biosensors with enzyme immobilisation for analytical application is reported. The study is aimed to develop a versatile and accurate analytical tool to be applicable for the determination of target analytes in real samples. The biosensor device is developed with employ immobilised enzyme as catalyic agent to convert target analytes to product that can be monitored electrochemically. Electrochemical biosensors, both in amperometric and potentiometric detection system have been prepared for different types of analytes. The strategy to immobilise ezyme in a matrix polymer is explained. Analytical performances of the the biosensors have been evaluated based on their detection sensitivity, linearity detection range, limit detection, selectivity, and stability. The enzyme electrode is prepared by immobilization of enzyme throughout polytyramine membrane film and attached tightly onto the surface of electrode. The working electrode was made via electropolymerization of monomer tyramine on an electrode surface from a mixed phosphate buffer/methanol solution containing enzyme at pH 6.0 followed by covalent attachment using EDC/NHS crosslinking agents. The precise control over the charge passed during deposition of the polytyramine polymer allows concomitant control over the thickness of the deposited enzyme layers onto the surface of the electrode. The reproducibility of the biosensors achieved is certainly due to the control of the thickness of the enzyme layer being limited by the resistance of the polytyramine film, and to the enzyme immobilization procedure on to the surface of the electrode. The biosensor showed good stability and to be applicable to determine analytes in real samples. Amperometric biosensor has been developed for the determination of various types of analytes such as glucose, sulfite, and uric acid. Potentiometric biosensor has also been developed with the same procedures for determination of analytes such as malic acid, cholesterol, and urea. The biosensor showed good stability and applicable to determine analyte in real samples.

Keywords
Electrochemical biosensor; Reproducible; Enzyme immobilisation; Potentiometric; Amperometric; Polytyramine matrix

Topic
Chemistry

Link: https://ifory.id/abstract/bCZymf3AYwL4

Corresponding Author
mellyta uliyandari

Institutions
a)Sciences Education Study Program, FKIP Bengkulu University, Indonesia
Jl. Wr. Supratman, Kandang Limun, Kec. Muara Bangka Hulu, Bengkulu 38371, Indonesia
*Mellytauliyandari[at]unib.ac.id
b)Postgraduate Sciences Education, FKIP Bengkulu University, Bengkulu 38371, Indonesia
c)Department of Biology FMIPA Bengkulu University,Bengkulu 38371, Indonesia

Abstract
This study aims is to determine the effect of the isolates concentration of civet coffee and fermentation time on the protein concentration profile and protein molecular weight profile of Robusta coffee which fermented in vitro, in vivo, and without fermentation. Isolates of civet coffee made from microbial civet feces and made in five variants concentrations (2,91x108 CFU/mL; 2,91x107cfu/mL; 2,91x 106cfu/mL, 2,91x105 CFU/mL; 2,91x104 CFU/mL). In the fermentation process coffee robusta beans marinated with various concentrations of coarse isolates. The coffee beans are fermented analyzed by Uv-Vis spectrophotometer and the results obtained in vitro protein concentration of the lowest 50,95 μg/mL (fermentation time of 60 hours and isolates concentration of 2,91 x 108 mg / mL), coffee fermentation in vivo (167,44 μg/mL), and coffee without fermentation (217,61 μg/mL). The protein molecular weight profile is determined based on the results of electrophoresis. The higher the concentration of isolates civet coffee in the fermentation process, the more protein bands appear, and vice versa.

Keywords
Robusta Coffee, coffee protein concentration profile, coffee protein molecular weight profile

Topic
Chemistry

Link: https://ifory.id/abstract/VwehXBvY8t7z

Corresponding Author
Tety Sudiarti

Institutions
UIN Sunan Gunung Djati Bandung

Abstract
The study of Polyethylene Oxide (PEO) activity as a corrosion inhibitor in 1% NaCl electrolyte solution was carried out by the Wheel Test method with variations in concentration and temperature. The results showed that polyethylene oxide (PEO) had the optimum inhibitory activity at a concentration of 16 ppm, with inhibition efficiency of 80.15% at 25˚C. Polyethylene Oxide has adsorption properties which are in accordance with the Langmuir adsorption isotherm with free adsorption energy of 21.385 kJ / mol. The results of electron microscopy (SEM) analysis showed that polyethylene oxide could inhibit corrosion rates with iron surfaces that had fewer pores than without inhibitors.

Keywords
corrosion inhibitor; Polyethylene Oxide; Wheel Test; SEM

Topic
Chemistry

Link: https://ifory.id/abstract/gGpTd2Vkf3Cu

Corresponding Author
Mala Utami

Institutions
Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Bengkulu
Jl.W.R.Supratman, KandangLimun 38317 A Bengkulu, Indonesia.
*e-mail address: asdim[at]unib.ac.id, malautami0598[at]gmail.com

Abstract
SnO2 nanoparticles are n-type semiconductor materials with the band gap of 3.6 eV. These materials have been widely used in various applications, for example transparent electrodes, microsensors, catalysts and resistors. Generally, the synthesis of SnO2 nanoparticles is influenced by several factors such as reactant concentration, capping agent, temperature, stirring and pH of the solution.This study aims to determine the effect of pH variations on the crystallinity and morphology of SnO2 material. This synthesis was carried out using the hydrothermal method for 3 hours at 100 0C with glucose as a capping agent. The effect of pH on the SnO2 nanoparticlesas synthesized was studied using X-Ray Diffraction (XRD) and Scanning Electron Microscope (SEM). XRD analysis shows that all SnO2 nanoparticles as synthesized relatively high purity and pH variations greatly influence to the crystallinity of the SnO2 nanoparticles. SEM images show that the aggregate formation is strongly influenced by changes in pH of the reaction solution. These results indicate that optimizing the pH of the reaction solution would be an alternative route for controlling the morphology of SnO2 nanoparticles.

Keywords
Nanoparticles, SnO2, Capping Agent, Glucose

Topic
Chemistry

Link: https://ifory.id/abstract/8Mf4d7vKJDAE

Corresponding Author
Ai Mahmudatussaadah

Institutions
1 Universitas Pendidikan Indonesia, Jl Dr. Setiabudhi 229 Bandung Indonesia;
2 STIH Institut Teknologi Bandung, Jl. Jatinangor Sumedang Indonesia

Abstract
Purple sweet potato is one of the potential sources of antioxidants. Anthocyanin in purple sweet potato is natural to experience enzymatic oxidation after contact with oxygen. The oxidation process causes the brown color to show a decrease in the amount of anthocyanin. The oxidation process was caused due to enzymatic activity. The purpose of this study was to describe the effect of steaming on color and the amount of anthocyanin of sweet potato flour. The method used is a one-factor experiment, namely cooking with water vapor. Stages carried out by material preparation, wet cooking, drying, grinding, and sieving. Color analysis using chromameter, and total anthocyanin amount using the pH difference method. The results showed that the steaming process gave bluish purple, and the amount of anthocyanin was higher than without steaming. This study implies that the steam blanching process of sweet potatoes can maintain the purple color of fresh sweet potatoes.

Keywords
Anthocyanin; Flour; Purple sweet potato; Steaming

Topic
Chemistry

Link: https://ifory.id/abstract/m2QkgxHJGVbd

Corresponding Author
Ferli Septi Irwansyah

Institutions
UIN Sunan Gunung Djati
*ferli[at]uinsgd.ac.id

Abstract
Augmented reality is one of the technologies that is increasingly being developed as a learning media in the field of chemistry. This study aims to describe the appearance of AR technology-based learning media on the concept of molecular hybridization. Design based research has produced products in the form of AR technology-based learning media on the concept of molecular hybridization. Research shows completing media creation, design development, and application creation and analyzing the results of limited trials. This study shows the making of AR technology-based learning media has the potential to be applied to chemical learning in accordance with the concept of molecular hybridization.

Keywords
augmented reality, chemistry learning media, molecular hybridization

Topic
Chemistry

Link: https://ifory.id/abstract/GdCabguL34rc

Corresponding Author
Rita Sahara

Institutions
Department of Chemical Education, UIN Sunan Gunung Djati Bandung, Jalan A. H. Nasution No. 105 Cibiru Bandung 40614 Indonesia
*zenabsc[at]uinsgd.ac.id

Abstract
The limitation in connecting the three levels of chemical representation is a major factor in the difficulty of learning the concept of chemical equilibrium. Computer-based molecular visualization and integrated three-dimensional animation can help students have representational capabilities by providing opportunities to present several levels simultaneously in various formats such as video, animation, and simulation. This study aims to create an e-module visualization of POE-based chemical equilibrium processes (Predict-Observe-Explain) which includes sub-concepts of dynamic equilibrium, homogeneous and heterogeneous equilibrium, and factors that influence chemical equilibrium. The three main activities in this e-module are predicting, observing and explaining. The e-module was created using the Design Based Research method with ADD design (Analysis, Design, Development) which was validated by two material expert lecturers and two multimedia expert lecturers producing an overall average calculation of 0.87 while the results of the feasibility test conducted at ten students show a percentage of 98.11%. This shows that this e-module is very suitable to be used as teaching material.

Keywords
e-module visualization; chemical equilibrium; POE learning model (Predict-Observe-Explain)

Topic
Chemistry

Link: https://ifory.id/abstract/2xafQtnBYu6V

Corresponding Author
Ferli Septi Irwansyah

Institutions
UIN Sunan Gunung Djati Bandung
*ferli[at]uinsgd.ac.id

Abstract
Electrolysis material is one of the materials presented in a practical manner. Learning that must be carried out with practicum being an obstacle for teachers to prepare the tools and materials while for schools that are still developing are constrained by the high cost of tools and materials needed. Based on these problems, an alternative learning media is needed which aims to assist and help teachers or students for studying electrolysis material. This research used method of research and development with the stages of analysis, design and development to produce Micro scale electrolysis KIT by using coin type lithium batteries. The results showed that the stages of the manufacture of micro-scale electrolysis KIT includes the step of analysis, design, development, implementation, and evaluation has been well done. The results of the feasibility test of micro-scale electrolysis KIT were declared valid with an average value of r count of 0.91. This shows that the micro-scale electrolysis KIT media that is made has a quite enough interesting, economical and practical appearance. Media presented with guided inquiry stages can help students learn electrolysis material.

Keywords
electrolysis; Micro scale; lithium

Topic
Chemistry

Link: https://ifory.id/abstract/RgjBUY9bWN62

Corresponding Author
Hazmi Fauzi

Institutions
a) Program Studi Pendidikan Kimia, Jurusan Pendidikan MIPA, Fakultas Tarbiyah dan Keguruan, Universitas Islam Negeri Sunan Gunung Djati Bandung, Jl. A. H. Nasution No. 105, Bandung, 40614, Indonesia
*hazmy.fauzy[at]gmail.com

Abstract
Learning on the concept of chemical bonds should be supported by all three levels of representation as a whole, including macroscopic, sub-microscopic, and symbolic. However, teaching materials that are widely used are still centered on symbolic aspects only. Based on these problems, technology-based teaching materials are needed to overcome this problem. This study aims to produce teaching materials in the form of electronic modules. This research used method of Design Based Research (DBR) which consists of the stages of analysis, design and development to be able to produce products in the form of electronic modules that have the characteristics of material presentation in inquiry by connecting three levels of chemical representation which displayed in the form of text, images, animations, flash and video. In general, the results of the average value of the validation test in the form of r count are between 0.77-0.81. Furthermore, the product was tested to 15 student respondents using a feasibility test instrument. The results of the feasibility test show that the percentage of feasibility in each aspect is in the range of 90-98% which agrees to all criteria. This shows an electronic module that has been made feasible to use.

Keywords
e-module; inquiry; chemical bond; chemical representation

Topic
Chemistry

Link: https://ifory.id/abstract/mQwJtakgK2Cn

Corresponding Author
Auliya Afifah

Institutions
Department of Chemical Education, UIN Sunan Gunung Djati bandung, Jalan A.H. Nasution No. 105 Cibiru Bandung 40614 Indonesia
*zenabsc[at]uinsgd.ac.id

Abstract
This research was conducted to produce teaching materials in the form of e-modules on alternative fuels material based on green chemistry. The presentation of material and visualization that used in this e-module based on green chemistry includes the losses caused by the use of fuel oil and the solutions offered to overcome them by the presence of alternative fuels based on green chemistry. This research uses the Design Based Research method with the ADDIE model. The e-module is tested for its feasibility. The results of the feasibility test show 94-100% of the respondents agreed to all the criteria in the e-module. These results indicate that the green chemistry-based alternative fuel e-module that has been made is feasible to use.

Keywords
e-module; alternative fuels; green chemistry

Topic
Chemistry

Link: https://ifory.id/abstract/4Gaxn73mqrWP

Corresponding Author
Ferli Septi Irwansyah

Institutions
UIN Sunan Gunung Djati Bandung
*ferli[at]uinsgd.ac.id

Abstract
This research used research and development method with stages of analysis, design and development to produce props of metal coating plates oriented chemical representation. This research is driven by the importance of a chemical learning medium that can present macroscopic, submicroscopic and symbolic representations on metallic coating materials so that material can be delivered well to students. Based on the results of the research, the product is obtained in the form of metal coating props with the characteristics of combining macroscopic, submicroscopic and symbolic representations with guidebooks and worksheets. Validation results indicate that the product is valid with the acquisition of the value of r-count on props of 0.92.

Keywords
props; chemical representation; metal coating

Topic
Chemistry

Link: https://ifory.id/abstract/f8upRegmTJPQ