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INDONESIA
Indonesian Chimica Letters
Published by Universitas Jember
ISSN : -     EISSN : 29646782     DOI : https://doi.org/10.19184/icl
Core Subject : Science,
Chemistry
ICL is an international peer-reviewed and open access journal that publishes scientific articles covering all branches of chemistry: organic chemistry, physical chemistry, inorganic chemistry, analytical chemistry, biochemistry, chemometry, and applied chemistry
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 5 Documents
 1 
Search results for , issue "Vol. 1 No. 2 (2022)" : 5 Documents clear
Effect of Zeolite Concentration on Hydrogel Characteristics of Arrowroot-Based Starch-G-Poly(Acrylic Acid)/Zeolite Composite Sjaifullah, Achmad; Saputra, Beny Akhmat; Adiwinata, I Nyoman; Santoso, Agung Budi; Busroni; Reza, Muhammad
Indonesian Chimica Letters Vol. 1 No. 2 (2022)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (856.304 KB) | DOI: 10.19184/icl.v1i2.201

Abstract

This study aims to synthesize a hydrogel zeolite composite of arrowroot starch graft copolymerized with acrylic acid through a radical polymerization reaction in a water. Various scenarios were tested using different natural zeolite concentration to determine the impact on swelling/water absorption of the composite. The resulting product was a solid gel-the test results showed that the swelling increased as the ratio of starch to acrylic acid decreased. Increased starch concentrations generally lead to decreased water absorption (swelling capacity). Adding a zeolite improved swelling to some extent and the optimum zeolite concentration was 60%. The increased concentration of zeolite also hardened the hydrogel composite. The highest swelling in the hydrogel composite of starch-g-poly(acrylic acid)/zeolite 60% is 1056.25 g.g-1. FTIR analysis of functional groups was conducted to determine differences in the IR spectra of arrowroot starch, acrylic acid, hydrogels, zeolites, and composite hydrogel. Si-O signal appearing on the IR spectra of hydrogel composite with wave number 1030 cm-1 indicates that composite hydrogel with zeolite was synthesized
The Permeation of High Concentration Hydrogen Sulfide (H2S) Gas Using PTFE (Polytetrafluoroethylene) and PVDF (Polyvinylidene Fluoride) membranes Asnawati, Asnawati; Diah Ayu Nur Sholehah; Dwi Indarti; Tri Mulyono; Bambang Piluharto; Muflihah, Yeni Maulidah
Indonesian Chimica Letters Vol. 1 No. 2 (2022)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1165.574 KB) | DOI: 10.19184/icl.v1i2.202

Abstract

Hydrogen sulfide (H2S) is a toxic, corrosive, and flammable gas. The presence of H2S gas can be reduced by a permeation method using PTFE (Polytetrafluoroethylene) membranes and PVDF (polyvinylidene fluoride) membranes. This H2S gas passed through the membrane and was then captured by the SAOB (Sulfide Anhydride Oxidant Buffer) in S2- species form. A visible spectrophotometer was applied for the analysis of passed H2S gas. Using a PTFE membrane, the optimum flow rate was obtained at 14.71 mL/min, with a mass flux of 0.825 kg/m2.hour, permeability coefficient of 0.696 kg/m2.hour.bar, and percent removal of H2S gas was 88.14%. The optimum flow rate for the SAOB was obtained at a rate of 0.30 mL/min with a mass flux of 0.843 kg/m2.hour and a percent removal of H2S gas of 89.98%. Based on the results obtained on the PVDF membrane, the mass flux produced in the optimization of H2S gas is 0.742 kg/cm2.hour, and the optimization of the SAOB solution is 0.754 kg/cm2.hour. The resulting permeability coefficient value is 0.741 kg/cm2.hour. The results indicate that this study can remove H2S gas at the optimum H2S gas flow rate of 4.76 mL/minute of 94.89% and the optimum SAOB flow rate of 0.3 mL/minute of 95.66%
Optimization of Centrifugation Speed and pH in Extraction of Uricase Enzyme from Goat Liver Handayani, Wuryanti; Esti Utarti; Riki Juni Krismiadi; AA. Istri Ratnadewi
Indonesian Chimica Letters Vol. 1 No. 2 (2022)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (719.421 KB) | DOI: 10.19184/icl.v1i2.203

Abstract

The human body does not have an enzyme that can break down uric acid, so the accumulation of uric acid can cause disease. This problem can be overcome by uricolytic therapy by utilizing the activity of the uricase enzyme. In this study, the uricase enzyme was extracted from goat liver by optimizing the centrifugation speed and the extraction pH. The purpose of the optimization is to get maximum uricase activity. Uricase extraction to optimize centrifugation speed using borate buffer pH 8.5 then centrifuged at 7.000; 9.000; 11.000; 13.000 and 15.000 rpm with a temperature of 4oC. Furthermore, pH optimization was carried out using pH buffers 6, 7, 8, 9, 10 and 11 by centrifuging the optimum speed obtained. The crude extract obtained was further tested for its enzyme activity . The results showed that the highest uricase activity was achieved if the extraction was carried out at pH 8 using centrifugation at an optimum speed of 13,000 rpm. The higher uricase activity indicates that the extracted uricase concentration is increasing.
Solid State Transformation of TiO2 Rutile and its Photocatalytic Activity Sulistiyo, Yudi Aris; Kamila, Wilda; Andarini, Novita; Suwardiyanto, Suwardiyanto; Sunnardianto, Gagus Ketut; Haryati, Tanti
Indonesian Chimica Letters Vol. 1 No. 2 (2022)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (716.495 KB) | DOI: 10.19184/icl.v1i2.205

Abstract

Transformation phase TiO2 Rutile was conducted to improve the photocatalytic activity. This study evaluated the transformation phase of TiO2 rutil using solid state rection method and tested for gycerol conversion reaction. a semiconductor material that can be applied for glycerol conversion. The solid state reaction using a mixture of TiO2 Rutile and sodium titanate in mole rasio 1:4 that was heated in 750 oC. XRD analysis evaluated the transformation phase of the solid state reaction product, while band gap energi was calculated following UV-Vis diffuse reflectance data. The photoactivity of glycerol was exposed by UV-Light in various time (5, 10, 15 h) that of the liquid product was analyzed by gas chromatography. Solid state reaction transformed TiO2 rutil to polymorph structure (TiO2 rutile, TiO2 anatase, and sodium titanate Na4O12Ti5). The band gap energy of the product was 3.2 eV. The optimum photocatalytic activity was 62.7% in glycerol concentration 0.25 M for 15 h time reaction.
Identification and determination α and β-acids from Columbus hops using Reverse Phase High Pressure Liquid Chromatography Zulfikar, Z.; Antje, Labes
Indonesian Chimica Letters Vol. 1 No. 2 (2022)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (752.048 KB) | DOI: 10.19184/icl.v1i2.206

Abstract

The present study has demonstrated the  HPLC method for identification and determination a and b-acids in Columbus hops. the measurement conditions has been set up included the use of Reverse phase C18 column Chromolith, gradient elution with methanol (A) and Acetonitril acidified with phosphate buffer at pH 2.8. While the flow rate has been applied of 0.8 mL/min, and it is run for 25 minutes. The separation of standard and sample has been monitored using UV variable detector in the rang of 300-340 nm. Pretreatment sample has been done using SPE with the cartridge of C18 similar to the analyte column. The results found that a four predominant peaks for α and β-acids, namely cohumulone (6.6 min), the second peak represents a mixture of humulone and adhumulone (8.9 min),  the third peak is colupulone (15.9 min) and the fourth is  a mixture of lupulone and adlupulone (16.7 min). The quantity of sample has been determined according to multipoint calibration using ICE2 standard, the sample found are 0,209 g/L cohumulone, 1.087 g/L of humulone and adhumulone, 0,349 g/L of Colupulone and 0.630 g/L of mixture of lupulone and adlupulone. In addition it is high precision measurement that is indicated by the value of RSD less than 1%.  

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