cover
Contact Name
Lalu Rudyat Telly Savalas
Contact Email
telly@unram.ac.id
Phone
+6287878138831
Journal Mail Official
telly@unram.ac.id
Editorial Address
A Building 2nd floor, Faculty of Teaching Training and Education, Mataram University, Jalan Majapahit No 62 Mataram, Mataram 83125, Indonesia
Location
Kota mataram,
Nusa tenggara barat
INDONESIA
Acta Chimica Asiana
Published by Universitas Mataram
ISSN : 2550049x     EISSN : 25500503     DOI : -
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 and short communication in all areas of Chemistry, including Chemical Education and Chemical Engineering. The editors welcome original contributions that have not been published and are not under consideration elsewhere. This journal is published by the Himpunan Kimia Indonesia Cabang Nusa Tenggara (Indonesian Chemical Society, Nusa Tenggara Division). All papers published free of charge
Articles 5 Documents
Search results for , issue "Vol. 1 No. 1 (2018)" : 5 Documents clear
Green synthesis, characterization, and electrochemical behavior of gold nanoparticles on boron-doped diamond electrode Wiyogo Prio Wicaksono; Aushofin Hamidah
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 (550.057 KB) | DOI: 10.29303/aca.v1i1.1

Abstract

Gold nanoparticles (AuNPs) have been successfully synthesized through a single-step bioreduction method using Piper betle leaf extract (PBLE) as a green reducing and stabilizing agent. Their formation was confirmed by UV-Visible spectroscopy, resulted in a characteristic Surface Plasmon Resonance (SPR) peak at 545 nm, whereas there is no peak observed in the extract. By using Particle Size Analyzer (PSA), it has been characterized that they have a ~100 nm diameter. For characterizing electrochemical behavior, the cyclic voltammetry technique was applied in a various range of electrolyte condition (HCl 0.1M, NaCl 0.1M, phosphate buffer 0.1M pH 7, and NaOH 0.1M). The best oxidation and reduction peak of the AuNPs were obtained in HCl at 0.93 V and 0.68 V, respectively. This green synthesized AuNPs could be applied as a label in immunochromatographic strip tests for various sensing applications.
Green Synthesis of Carbon Nanotubes from Coconut Shell Waste for the Adsorption of Pb(II) Ions Yusuf Zaim Hakim; Yoki Yulizar; Adi Nurcahyo; Magun Surya
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 (409.683 KB) | DOI: 10.29303/aca.v1i1.2

Abstract

Numerous complex methods have been developed for the preparation of carbon nanotubes (CNT) such as laser vaporization, arc discharge, pyrolysis, and chemical vapour deposition (CVD). In this study, an environmentally friendly and convenient method called one-step water assisted (quenching) synthesis method was conducted from graphite flakes, which were taken from coconut shell wastes to produce carbon nanotubes. Chemical and physical structure of the carbon nanotubes were characterized by FTIR (Fourier Transform Infrared), Scanning Electron Microscope (SEM), and Transmission Electron Microscopy (TEM). Adsorption performance of heavy metals Pb(II) ions by CNTs has been evaluated using the stirring method, and the concentration of Pb(II) ions has been determined using Atomic Absorption Spectroscopy (AAS). The adsorption conditions such as pH and contact time have been obtained. The results showed that carbon nanotubes were a bit successfully formed, in which the tubes distribution are scattered irregularly. The average tube diameter was 123 nm. During the adsorption test, it was found that the adsorption was proportional to the contact time, in which the optimum contact time was 20 minutes. The optimum pH of Pb(II) ions absorption was 5 where the potential for Pb(II) ions absorption was 120 %. The results indicate the true potential of this green chemistry based method, and it opens the chance for possibility to produce carbon nanotubes at a larger scale.
The Utilization of Edamame (Glycine max (L.) Merr) And Red Bean (Phaseolus vulgaris) As A Functional Beverage Melanie Cornelia; Soraya Triesly Lessy
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 (679.269 KB) | DOI: 10.29303/aca.v1i1.4

Abstract

Indonesia had the big potency to produce red beans and edamame beans, but its utilization regarding functional food was not optimal. This research was intended for development combining red and edamame beans to become a new functional beverage product. The ratio of edamame milk to red bean milk (100:0, 75:25, and 50:50) and cooking temperature 90 oC has been selected based on SNI soymilk. During storage, a phase separation happened. Consequently, stabilizer should be added to improve its stability. Three types of stabilizers were used,CMC 0.1 %, 0.2%, and 0.3 %, xanthan gum (XG), and guar gum (GG) 0.025 %, 0.05 %, and 0.1 %, respectively. The best formulation was milk ratio 75:25 with 90 oC and addition of XG 0.05 %. The dietary fiber analysis for milk formulation was 4.46 % therefore it was categorized as a functional beverage.
Theoretical study on the binding selectivity of 18-membered azacrown ethers with alkaline earth metal species Saprini Hamdiani; Lalu Rudyat Telly Savalas; Agus Abhi Purwoko; Saprizal Hadisaputra
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 (859.878 KB) | DOI: 10.29303/aca.v1i1.5

Abstract

The binding selectivity of 18-membered azacrown ethers (monoaza- N1, diaza- N2, triaza- N3, tetraaza- N4, pentaaza- N5, and hexaaza-18-crown-6 N6) with Ca2+, Sr2+, Ba2+ have been studied by density functional theory (DFT) calculations. The complex binding selectivity was analyzed in term of interaction energies, thermodynamic properties, second order interaction energies, and charge transfer effects. The geometrical study shows that Ca2+ and azacrown complexes acquire envelope like structure, leading to shorter bond lengths. As a result, these complex systems have the highest interaction energies. Theoretical study also showed that N6 complex with alkaline earth metal ion were shown to be more stable complex than those ligand with lower nitrogen number. The interaction energy order is N0 < N1 < N2 < N3 < N4 < N5 < N6. This trend shows that the presence of more nitrogen on the crown ether cavity increases the interaction energies by approx. 7.3 % in going from N0 to N6. It is clearly showed that the contribution of the number of nitrogen play a dominant role in the binding selectivity of these systems.
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.

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