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Acta Chimica Asiana
Published by Universitas Mataram
ISSN : 2550049x     EISSN : 25500503     DOI : -
Core Subject : Science,
Chemistry
Acta Chimica Asiana (online ISSN 2550-0503, print ISSN 2550-049x) is a peer-reviewed, open access journal that publishes high-quality original research articles as well as review articles in all areas of Chemistry and Chemical Engineering. Significant finding that is insufficient to be presented as comprehensive paper but needs to reach the reader immediately may also be submitted as a short communication. The editors welcome original contributions that have not been published and are not under consideration elsewhere. This journal published by the Indonesian Chemical Society, Chapter Nusa Tenggara and the University of Mataram. All papers published free of charge. Upon request, language assistance may also be provided to ensure valuable works in chemistry meet their readers. Acta Chimica Asiana is a peer-reviewed, open access journal that publishes original research articles, review articles, as well as short communication in all areas of chemistry, including applied chemistry, and chemical engineering. Subject areas include (but are by no means limited to): 1. Analytical chemistry, including new techniques and instrumentation 2. Biochemistry and medicinal chemistry 3. Inorganic chemistry, including main group, transition metal, and f-block compounds, as well as coordination, organometallic, and solid state chemistry 4. Materials chemistry of hard and soft matter, from the nanoscale upwards 5. Nuclear chemistry and radioactivity 6. Organic chemistry, including synthesis, characterization, and properties of organic compounds, as well as study of organic reactions and their mechanisms 7. Physical chemistry and chemical physics 8. Sustainable, green, and environmental chemistry 9. Theoretical and computational chemistry
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 5 Documents
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Search results for , issue "Vol. 3 No. 2 (2020)" : 5 Documents clear
Stability Study of Four Layer Aurivillius Oxide of AxBi4-xTi4O15 (A = Ca, Sr, Ba): Atomistic Simulation Akram La Kilo; La Alio; La Ode Aman; Jafar La Kilo
Acta Chimica Asiana Vol. 3 No. 2 (2020)
Publisher : Chemistry Education Program, the University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/aca.v3i2.42

Abstract

Aurivillius is bismuth layered structure ferroelectrics that can be applied as memory, sensor, and catalyst. This research aimed to study the stability of AxBi4-xTi4O15 Aurivillius (A = Ca, Sr, and Ba). Dopants (A) partially substitute Bi at the sites of Bi(1) and Bi(2) of the perovskite layer. This research method is an atomistic simulation using by the GULP code. Simulations were carried out by means of AxBi4-xTi4O15 geometry optimization at constant pressure, using the Buckingham potential. The results showed that the increase in the concentration of dopants substituting Bi accompanied by an increase in lattice energies. The most stable Aurivillius was CaxBi4-xTi4O15 (x = 16.3%) carried out by Bi substitution at Bi(2) site, with lattice energy, -1668.227 eV. Aurivillius stability decreases by increasing the size of the dopant. The maximum concentration number of A dopant substituting Bi was discussed.
The Effect of Soda Pulping Variables on Pulp Properties of Coir Fiber Maria Ulfa; Koriatul Isnaini
Acta Chimica Asiana Vol. 3 No. 2 (2020)
Publisher : Chemistry Education Program, the University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/aca.v3i2.47

Abstract

Abstract The potential use of coir fiber for pulping and papermaking has been investigated. This research aimed to study effects of pulping processing variables (temperature, pulping time, and alkali charge/solvent pulping) on the properties of pulp (residual lignin, alpha cellulose, kappa number and pulp yield) from coir fiber. For this purpose, the coir fibers were cooked using alkali charge (10 to 20% oven dried, as NaOH), pulping time from 60 to 120 min and temperature from 65 to 180oC. Results indicated that alkali charge and pulping time gave more impact on the properties of pulp than temperature. Pulping at high temperature, long pulping time, and high alkali charge resulted in decreasing of lignin, pulp yield, and kappa number but instead on alpha cellulose content. Keywords: coir, soda pulping, lignin
Methyl Linoleate Synthesis From Cotton Seeds Oil : Optimization Study Erin Ryantin Gunawan; Dedy Suhendra; Rohana Rohana; Desy Komalasari
Acta Chimica Asiana Vol. 3 No. 2 (2020)
Publisher : Chemistry Education Program, the University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/aca.v3i2.48

Abstract

Methyl esters are derivatives of triglycerides (oils or fats) that can be produced through esterification and transesterification process. One example of the methyl esters are widely used as an industrial raw material is methyl linoleate. Methyl linoleate is a colorless liquid with molecular formula C19H34O2. Methyl linoleate is a fatty acid ester and has a lot of common use as biodiesel ingredient, textiles, in medical research, emulsifiers and lubricants. The raw materials commonly used for the synthesis of methyl esters are palm oil, coconut oil, soybean oil, and others. But these oils are edible oil materials, so that in this case the raw materials that will be used is the cotton seed that has not been exploited well. The optimization reaction of the methyl linoleate synthesis through enzymatic transesterification from cotton (Ceiba pentandra L.) seed oils and methanol by Response Surface Methodology (RSM) was carried out. Immobilized lipase (lipozymeTL IM) used as catalyst. This research aims to optimize the reaction by observing variety of conditions that are influenced by several variables, such asreaction time, molar ratio, the amount of enzyme and the reaction temperature. Design Expert v.7 software used to view the interaction between the variables via RSM. The mathematical equations and statistical methods showed that the optimum condition of the enzymatic transesterification was obtained at 0.15 gram of amount of the enzyme, the ratio of cotton seed oils: methanol of 1: 2.05 (g/g), a reaction time of 14 hours and a temperature of 49.95 oC with the predicted and actual percentages yield of 37.87 and 38.24%, respectively. The model recommended for obtaining optimum results is a quadratric model with a R-squared value of 0.6957. Keywords: Methyl linoleate, Cotton seed oils, Lipozyme, Optimization study, Design Expertv.7
Design of Trolox Compounds as Antioxidant and Their Analysis Using Quantitative Structure Activity Relationship Hasmalina Nasution; Nur Enizan; Nurlaili Nurlaili; Jufrizal Syahri
Acta Chimica Asiana Vol. 3 No. 2 (2020)
Publisher : Chemistry Education Program, the University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/aca.v3i2.40

Abstract

Antioxidant compound can inhibit the oxidation of lipids and other biomolecules. The role of antioxidants is very important in neutralizing and destroying free radicals that can cause the damage to cells in the body. This research was carried out to design trolox derivate compounds as antioxidants using the QSAR method. The semi empirical AM1(Austin Model 1)method was used to generate the QSAR model. The statistical analysis result using multiple linier regression methods revealed thet antioxidant activity was influenced by the descriptors of qC1, qC4, qO7, qC13 and qO18. The QSAR equation model obtained was log IC50 = 0.821 + 7.067 (qC1) + 2.585 (qC4) + 4.812 (qO7) – 5.363 (qC13) – 0.887 (qO18) with the best predicted IC50 value was 4.699 µM. Keywords: Antioxidants, QSAR, semi empirical AM1, trolox
Effect of Storage Duration on Physicochemical and Antibacterial Activities of Sweet Corn-based Synbiotic Yogurt with Honey Musyirna Rahmah Nasution; Winda Sri Wahyuni
Acta Chimica Asiana Vol. 3 No. 2 (2020)
Publisher : Chemistry Education Program, the University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/aca.v3i2.38

Abstract

Synbiotic yogurt is fermented milk containing probiotics and prebiotics. The quality of symbiotic yogurt products during cold storage must meet the SNI quality requirements (2981-2009). This study aimed to find the effect of yogurt storage duration on physicochemical properties and antibacterial activity for the best yogurt storage time. In this study, synbiotic yogurt was made from sweet corn, honey, and full cream milk as prebiotics and Lactobacillus acidophilus and Bifidobacterium bifidum as probiotics. The tests carried out include testing total coliform, total lactic acid bacteria, degree of acidity (pH), total titrated acid, organoleptic quality, and antibacterial activity. The tests were carried out on days 0, 5, 10, 15, and 20. The results showed that storage duration affected product quality and antibacterial activity. The best storage duration for yogurt was found to be ten days, where the yogurt stored for ten days found to have a total coliform of 0 APM/g, total lactic acid bacteria of 2.81 x 1012, total lactic acid of 1.684%, pH value of 3.5 and was still preferred and could be accepted by the panelists, based on the organoleptic assessments. The yogurt stored for ten days also gave the largest average inhibition diameter of 21.78 mm with the category 'very strong' against Escherichia coli and 22.13 mm with the classification 'very strong' against Salmonella typhi. The yogurt stored for up to 10 days still met the SNI yogurt quality standard requirements (2981: 2009).

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