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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 103 Documents
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A Naked-Eye Fluoride Ion Recognition Based Vanilin Derivative Chemosensors R Rahmawati; Bambang Purwono; Sabirin Matsjeh
Acta Chimica Asiana Vol. 2 No. 2 (2019)
Publisher : Chemistry Education Program, the University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (429.858 KB) | DOI: 10.29303/aca.v2i2.16

Abstract

Two new receptors S2 and S6 were designed and synthesized based on benzimidazole and azo-benzimidazole synthesized from vanillin for the colorimetric detection of fluoride ion. The presence of nitro group in S2 and azo in S6 makes –OH proton (binding site) acidic and therefore it could deprotonate with addition of basic anion such as fluoride. Hydroxyl (–OH) functionality which detects basic fluoride ions via hydrogen-bonding mechanism wich is mechanism involved in the color change of receptor R2 and R6, its mean that initial hydrogen bond formation of F− ion with –OH group.
Benzimidazole corrosion inhibition performance: A DFT Study Farid Wajdi; Saprizal Hadisaputra; Iwan Sumarlan
Acta Chimica Asiana Vol. 1 No. 2 (2018)
Publisher : Chemistry Education Program, the University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/aca.v1i2.27

Abstract

The corrosion inhibition performance of benzimidazole and its derivatives have been studied by density functional theory DFT in aqueous medium. For this investigation, the corrosion inhibition efficiencies of the protonated and non-protonated spesies of benzimidazole and its derivatives were investigated. The ionization potential of the inhibitors has a strong influence on the efficiency of corrosion inhibitors. The linear correlation was shown between electronic properties and corrosion inhibition efficiency. Electron donating substituents increase the corrosion inhibition efficiency, whereas electron withdrawing substituents give the opposite effect. The NH2 substituent contributes highest, whereas NO2 provides the weakest contribution to the corrosion inhibition efficiency for both non-protonated and protonated species of inhibitors.
The Influence Of Relating, Experiencing, Applying, Cooperating And Transfering Learning Models Toward Chemistry Learning Outcomes Wainda Sardika Dewi; Mukhtar Harris; Jackson Siahaan
Acta Chimica Asiana Vol. 1 No. 2 (2018)
Publisher : Chemistry Education Program, the University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/aca.v1i2.31

Abstract

The purpose of this study was to investigate the effect of Relating, Experiencing, Applying, Cooperating And Transfering REACT model on chemistry learning outcomes of the eleventh grade students at the senior high schools in West Lombok Indonesia. The research type is quasi-experimental design with posttest only control group design. The population in this study were all the eleventh grade students and 80 students were taken as samples. They were determined through saturated sampling techniques. The reserach hypothesis testing was carried by the t-test. It was found that tcount 3.10 is higher that ttable (1.68) at a significant level of 5%. This result indicate that the application of the REACT learning model provides a better influence than conventional learning models on chemistry learning outcomes.
Prediction of High Performance Liquid Chromatography Retention Time for Some Organic Compounds Based on Ab initio QSPR Study Hirjani Hirjani; Mudasir Mudasir; Harno Dwi Pranowo
Acta Chimica Asiana Vol. 1 No. 1 (2018)
Publisher : Chemistry Education Program, the University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (623.983 KB) | DOI: 10.29303/aca.v1i1.6

Abstract

Analysis of the quantitative relationship between structure and characteristics of 18 polyaromatic hydrocarbons has been done by quantum Ab initio Quantitative Structure-Property Relationship (QSPR) study at Hartree Fock level of theory. Moment dipole was used as the quantum chemical descriptors, whereas molecular weight and number of rings were applied for constitutional descriptor and the valence connectivity index as steric descriptors. The compound’s electronic structure was studied by molecular modeling and retention time (Tr) data were obtained from the literature. Multi-linear regression analysis has been performed by randomly splitting the initial data set into on fitting data set and a test data set. The best result provided by QSPR analysis is the following model equation: log tR = 1.276 + 0.016MW+0.323Rc-0.423χ1-0.147χ2 with n =18 r=0.917 r2 =0.841 SE=0.182 Fcalc/Ftable = 5.408. The retention times of PAH compounds with two and three rings were successfully predicted by QSPR models.
Prediction of the Corrosion Inhibition Efficiency of Imidazole Derivatives: A Quantum Chemical Study Saprizal Hadisaputra; Zohrul Iskandar; Dina Asnawati
Acta Chimica Asiana Vol. 2 No. 1 (2019)
Publisher : Chemistry Education Program, the University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/aca.v2i1.15

Abstract

Corrosion is a process of metal destruction due to the metal-acidic environment reaction. The uncontrolled corrosion process lead to massive losses. Administering inhibitors of organic compounds on the metal surface may prevent the corrosion processes. Organic inhibitors are low toxicity, environmentally friendly, effective easy to obtain and cheap. The study aims to determine the effect of substituents to the efficiency of corrosion inhibition of imidazole in carbon steel based on quantum chemical parameters. Corrosion inhibition efficiency values ​​are strongly influenced by the addition of substituents namely electron donors (CH3, CHCH2, NH2, CH2OH and OH) and electron withdrawal (CHO, COOH, NO2, F and Cl). The addition of amine group NH2 increased the corrosion inhibition efficiency to 91 % whereas amino group NO2 reduced the efficiency of corrosion inhibition to 64 %. Analysis of the Fukui function shows that imidazole has active sides on the C1 and C3 atoms. NBO analysis shows that there is an interaction of N5 atoms that donate electrons to Fe13 at 8.67 kcal.mol-1. In conclusion, the addition of an electron donor group increases the efficiency of corrosion inhibition of imidazole.
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.
QSAR and Ab Initio studies of quinolon-4(1H)-imine derivatives as antimalarial agents Jafar La Kilo; Akram La Kilo; Saprini Hamdiani
Acta Chimica Asiana Vol. 4 No. 1 (2021)
Publisher : The University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/aca.v4i1.39

Abstract

Malaria is still the most dangerous disease threat in the world, including in Indonesia. In Indonesia, it is estimated that there are 20 million cases of malaria per year. Malaria resistance to conventional drugs requires the search for new antimalarial drugs. Molecular modeling can be a solution to these problems. An activity study of 22 quinolone-4 (1H) -imine derivatives as antimalarials was carried out using the QSAR Quantitative Structure-Activity Relationship method. The electronic and molecular descriptors were obtained from the Hartree-Fock HF / 6-31G ab initio calculation. The multiple linear regression (MLR) method was used to construct the QSAR model. The best QSAR models produced are: pEC50 = -4,177 + (37,902 x qC3) + (171,282 x qC8) + (9,061 x qC10) + (125,818 x qC11) + (-149,125 x qC17) + (191,623 x qC18), with statistical parameters, n = 22; r2 = 0,910; SEE = 0,171; Fhit/Ftab = 4,510 dan PRESS = 0,697. The best QSAR equation model can be used as a reference for designing and predicting the antimalarial activity of Quinolon-4 (1H) -imine derivatives which have higher activity than the previous one
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
The Effect of Stirring Speeds to the Entrapment Efficiency in a Nanoparticles Formulation of Java Plum’s seed Ethanol Extract (Syzygium cumini) Widayanti Supraba; Yohanes Juliantoni; Agus Dwi Ananto
Acta Chimica Asiana Vol. 4 No. 1 (2021)
Publisher : The University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/aca.v4i1.50

Abstract

Java Plum’s (Syzygium cumini) seed contains flavonoids in the form of quercetin. Quercetin plays an essential role in stimulating insulin production from pancreatic beta cells. However, it could be easily degraded by gastric acid or the digestive system. Thus, in this research, a good delivery system for quercetin will be established, namely nanoparticles. The study objectives are determining the entrapment efficiency’s percentage of nanoparticle preparations from ethanol extracts of Java Plum’s seeds as well as observing the effect of stirring speed on the percentage of entrapment efficiency. Java Plum’s seed extract was obtained by maceration method using ethanol 70% with the ratio between the simplicial powder and solvent is 1 : 4 respectively. Meanwhile, the solvent evaporation process was undergone by using a water bath with temperature not exceeding 70°C. The nanoparticle formulation of Java Plum’s seed extract was made by adding polymers in the form of chitosan and sodium tripolyphosphate cross-linker with three variations of stirring speed (500, 1000, and 1500 rpm) using a magnetic stirrer. The percentage of entrapment efficiency was obtained by subtracting the flavonoids levels of Java Plum’s seeds extract and flavonoids levels of Java Plum’s seeds extract in nanoparticles. Then, the value was divided by flavonoids levels of Java Plum’s seeds extract and multiplied by 100%. Quercetin levels obtained by absorbance readings using spectrophotometry UV-Visible, then absorbance value added into variable X on equation quercetin’s standard curve y = 0,0229x + 0,0644. The results show that the percentage of entrapment efficiency at speed variations of 500, 1000, and 1500 rpm are 48.8459%, 49.1064%, and 56.0413% respectively. According to the t-test two independent samples statistical test, the data has a 0.961 probability value (500 rpm vs 1000 rpm), 0.324 probability value (1000 rpm vs 1500 rpm), 0.25 (500 rpm vs 1500 rpm). Probability value > 0.05, which means the stirring speed does not significantly influence the percentage of entrapment efficiency.
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

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