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Indonesian Journal of Chemistry

ijc
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Published by Universitas Gadjah Mada

ISSN : 14119420 EISSN : 24601578 DOI : -

Core Subject : Science, Engineering,

Chemical Engineering, Chemistry & Bioengineering Chemistry

Indonesian Journal of Chemistry is an International, 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. The journal is accredited by The Ministry of Research, Technology and Higher Education (RISTEKDIKTI) No : 21/E/KPT/2018 (in First Rank) and indexed in Scopus since 2012. Since 2018 (Volume 18), Indonesian Journal of Chemistry publish four issues (numbers) annually (February, May, August and November).

Arjuna Subject : -

Articles 1,981 Documents

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PREPARATION OF Ni-Mo/MORDENITE CATALYSTS UNDER THE VARIATION OF Mo/Ni RATIO AND THEIR CHARACTERIZATIONS FOR STEARIC ACID CONVERSION Wega Trisunaryanti; Triyono Triyono; Denty Fibirna A
Indonesian Journal of Chemistry Vol 3, No 2 (2003)
Publisher : Universitas Gadjah Mada

The preparation of Ni-Mo/Mordenite catalysts with variation of Mo/Ni ratio and their characterizations for conversion of stearic acid have been conducted. The catalysts were prepared by loading a small amount of nickel and/or molybdenum on H-Mordenite (H-Mor) with total metal content = 1 wt% based on the mordenite. The metals was supported on to the mordenite by impregnation method using nickel nitrate and/or ammonium heptamolybdate solution. The Mo/Ni ratio was varied as follows 0/1, 1/0, 1/1, 2/1, and 3/1 produced Ni/Mor, Mo/Mor, Ni1-Mo1/Mor, Ni1-Mo2/Mor and Ni1-Mo3/Mor catalyst respectively. The catalysts were then calcinated with nitrogen, oxidized with oxygen and reduced by hydrogen.The characterizations of catalyst were carried out by measuring Ni and Mo contents using atomic absorbtion spectroscopy (AAS), acidity by ammonia vapour adsorption, specific surface area and pore size distribution by nitrogen gas adsorption (NOVA-1000). The catalyst characters on conversion of stearic acid were performed in a flow reaction system at 4000C under hydrogen stream (10 mL/min).The AAS analyses showed that the metal impregnated on to the H-Mor sample were consistent to the initial metal concentrations. The loading of Ni and/or Mo enhanced the acidity, however decreased the specific surface area and total pore volume of the H-Mor sample. The higher the acidity the higher the conversion of stearic acid and the lower the coke formation. The other catalyst characters gave the variation effects toward the stearic acid conversion. The conversions of stearic acid were 34,52%, 43,33%, 65,10%, 80,10%, 86,42% and 95,72% produced by Ni1-Mo3/Mor, H-Mor, Mo/Mor, Ni/Mor, Ni1-Mo2/Mor and Ni1-Mo1/Mor catalyst, respectively.

THE UTILIZATION OF THERMOPHILIC PROTEASE WHICH LIFE IN HOT SPRING CANGAR BATU MALANG Rudiana Agustini
Indonesian Journal of Chemistry Vol 6, No 2 (2006)
Publisher : Universitas Gadjah Mada

Thermophile protease has economic value, because this enzyme is useful on all kind of industry that used high temperature on it production process. The thermophile has been isolated from hot water spring at Cangar Batu Malang called CG-10 isolate. The characteristic of CG-10 are; bolt colony has a brown-white colour, rod form cels with size 6-14 µm and Gram positive. Identification with 16S-rRNA gene of their isolate shows 98.305% similarity with B. caldoxylolyticus. The protease characteristic of CG-10 isolate, fractionated by ammonium sulfate 35% (w/v), centrifuged by 4000 rpm of speed for 15 minute, (1) has optimum temperature of 80oC; (2) has optimum pH 8, (3) can survive until 60 minutes of incubation time at temperature 80oC , (4) the molecule weight of: 60-76 kDa with pH1 value between 7.5 - 8.20, (5) this protease is alkaline serine protease, and (6)Vmaks value 0.622 unit menit -1 and KM 9.8 µmol/L, so this CG-10 isolate protease can be use in detergent industry.

ISOFLAVONES AGLICONE OF TEMPE MALANG FRIED SLICES Yetti Mulyati Iskandar; Sri Priatni
Indonesian Journal of Chemistry Vol 8, No 3 (2008)
Publisher : Universitas Gadjah Mada

Soybean fermentation was carried out by using mixed culture Rhizopus oligosporus C and Rhizopus oryzae L16 (1:1) as inoculum. Incubation places in an incubator at 30 oC for 5 days and assessment of β-glucosidase activity daily was investigated. Isoflavones aglicone of tempe produced in laboratory scale, tempe commercial and fried slices tempe from Malang were analized by chromatography technique. Bioconversion of isoflavonoida in soybean to isoflavone aglicone compounds can be caused by extracelluler enzyme b -glucosidase. The observation showed that fresh tempe Malang was obtained genistein content 15.57 mg/100 g defatted tempe higher than tempe produced from laboratorium scale that was 5.45 mg/100 g defatted tempe. However, genistein content of fried slices tempe from Malang content decreased 25%, that was 11.45 mg/100 g defatted tempe. Tempe prepared at laboratory had the highest specific activity of β-glucosidase at day two that was 1693 U/g protein.

COMPUTATIONAL INVESTIGATION ON THE STRUCTURE AND NMR CHEMICAL SHIFTS OF ENDO-CONE [CS2(p-METHYLCALIX[4]ARENE)] COMPLEX Hanggara Sudrajat; Muhammad S. Saefullah; Danis Sriwijaya; Mirta A. Putri; Ria Armunanto
Indonesian Journal of Chemistry Vol 9, No 2 (2009)
Publisher : Universitas Gadjah Mada

The structure and NMR chemical shifts of endo-cone [CS2(p-methylcalix[4]arene)] complex have been computationally investigated using BIO+ force fields, semi-empirical (PM3) and ab initio (RHF/6-311G++(d,p)) calculations. The first comparison of ab initio NMR chemical shift calculations for a calix[4]arene inclusion complex with solid-state 13C NMR chemical shifts based on the 1:1 complex of p-methylcalix[4]arenes with carbon disulfide in endo-cone complexation mode has been reported. The results showed that ab initio (RHF/6-311G++(d,p)) NMR calculations of the host-guest [CS2(p-methylcalix[4]arene)] complex are in good agreement with experimental solid-state NMR data.

CHARACTERIZATION OF 0.58 kb DNA STILBENE SYNTHASE ENCODING GENE FRAGMENT FROM MELINJO PLANT (Gnetum gnemon) Tri Joko Raharjo; Rosyida Azis Rizki; Stalis Norma Ethica; Elly Rustanti; L. Hartanto Nugroho
Indonesian Journal of Chemistry Vol 11, No 3 (2011)
Publisher : Universitas Gadjah Mada

Resveratrol is a potent anticancer agent resulted as the main product of enzymatic reaction between common precursor in plants and Stilbene Synthase enzyme, which is expressed by sts gene. Characterization of internal fragment of Stilbene Synthase (STS) encoding gene from melinjo plant (Gnetum gnemon L.) has been carried out as part of a larger work to obtain a full length of Stilbene Synthase encoding gene of the plant. RT-PCR (Reverse Transcriptase Polymerase Chain Reaction) was performed using two degenerated primers to amplify the gene fragment. Ten published STS conserved amino acid sequences from various plant species from genebank were utilized to construct a pair of GGF2 (5' GTTCCACCTGCGAAGCAGCC 3') and GGR2 (5' CTGGATCGCACATCC TGGTG 3') primers. Both designed primers were predicted to be in the position of 334-354 and 897-916 kb of the gene respectively. Total RNA isolated from melinjo leaves was used as template for the RT-PCR amplification process using two-step technique. A collection of 0.58 DNA fragments was generated from RT-PCR amplification and met the expected results. The obtained DNA fragments were subsequently isolated, refined and sequenced. A nucleotide sequence analysis was accomplished by comparing it to the existed sts genes available in genebank. Homology analysis of the DNA fragments with Arachis hypogaea L00952 sts gene showed high similarity level. Taken together, the results are evidence that the amplified fragment obtained in this study is part of melinjo sts gene

A TRITERPENOID SAPONIN FROM SEEDS OF KOLOWE (Chydenanthus excelsus) Laode Rijai; Supriyatna Sutardjo; Husein Hernandi Bahti; Unang Supratman; Rymond J. Rumampuk; W.C. Taylor
Indonesian Journal of Chemistry Vol 4, No 3 (2004)
Publisher : Universitas Gadjah Mada

A triterpenoid saponin have been isolated from n-butanol fraction of the seeds of kolowe (Chydenanthus excelsus). The structure was determined as 3-O-[β-D-glucopyranosyl(1→3)-β-D-xylopyranosyl(1→3)- β - D-glucuronopyranosyloxy]- 22α -O-(2-methylbutiroyloxyolean-12-en-15α,16α,28-tri-hydroxy. Structure elucidation was accomplished by NMR (HMBC, HMQC/HSQC, ROE, ROESY, TOCSY) methods, ESIMS, and IR spectroscopic.

PHYSICAL CHARACTERIZATION OF Ni(II) DOPED TiO2 NANOCRYSTAL BY SOL-GEL PROCESS Prasetyo Hermawan; Harno Dwi Pranowo; Indriana Kartini
Indonesian Journal of Chemistry Vol 11, No 2 (2011)
Publisher : Universitas Gadjah Mada

Ni(II) doped titanium dioxide has been prepared by using sol-gel process. Ni(II) ion was incorporated into titanium dioxide by reacting Ni(II) chloride with titanium tetraisopropoxide (TTiP)-acetyl acetone mixture in isopropanol solvent. The effects of transition metal ion doping on the physical properties have been investigated. UV/Vis spectrophotometer, TGA-DTA, X-ray diffraction (XRD) and DR-UV/Vis were used to investigate the spectra absorption of nanosol, nanoparticle thermal transition, structure of crystal and band edge absorption, respectively. The results at addition of 5% Ni/Ti revealed that absorbance of nanosol increased from 0.811 (λmax: 342 nm) to 2.283 (λmax: 350 nm). The crystallization temperature transition from anatase to rutile decreased from 500 °C to 475 °C. The particle size increased from 18.51 nm to 20.35 nm, while the band gap energy (Eg) decreased from 2.73 eV to 2.51 eV.

PILLARIZATION OF LAYERED TETRATITANATES ANION BY ZIRCONIUM(IV) POLYCATION SPECIES Hari Sutrisno; Endang Dwi Siswani
Indonesian Journal of Chemistry Vol 9, No 3 (2009)
Publisher : Universitas Gadjah Mada

Pillaring layered tetratitanates anion by zirkonium(IV) polycation species has been realized by three steps: 1). cation-exchange of potasium tetratitanates, 2). intercalation of n-butylamine compound in layered hydrogen tetratitanates and 3). intercalation of zirconium(IV) polycation species by mixing butylamine-intercalated tetratitanates with an aqueous solution of ZrOCl2.8H2O at pH various: 0.1, 0.9 and 1.8. The procedure was carried out by Chimie Douce method. The structures of titanates and the products which had undergone H+ exchange and intercalated by n-butylamine and zirkonium(IV) polycation spesies were investigated by X-rays Diffractometer (XRD) and X-rays Fluorescence (XRF). It was found in the research that [Zr(H2O)8]4+, [Zr(OH)(H2O)7]3+ or [Zr(OH)2(H2O)6]2+ types have presented in the interlayer of the products. At pH = 0.1 and 0.9, [Zr(OH)(H2O)7]3+ type was pillared more dominated in layered tetratitanates than [Zr(H2O)8]4+ type. At pH 1.8, it was signaled that [Zr(OH)(H2O)7]3+ and [Zr(OH)2(H2O)6]2+ types intercalated in layered tetratitanates.

COLLABORATIVE TRIAL AND QUALITY CONTROL IN CHEMICAL ANALYSIS Narsito Narsito
Indonesian Journal of Chemistry Vol 2, No 3 (2002)
Publisher : Universitas Gadjah Mada

This paper deals with some practical problems related to the quality of analytical chemical data usually met in practice. Special attention is given to the topic of quality control in analytical chemistry, since analytical data is one of the primary information from which some important scientifically based decision are to be made. The present paper starts with brief description on some fundamental aspects associated with quality of analytical data, such as sources of variation of analytical data, criteria for quality of analytical method, quality assurance in chemical analysis. The assessment of quality parameter for analytical method like the use of standard materials as well as standard methods is given. Concerning with the quality control of analytical data, the use of several techniques, such as control samples and control charts, in monitoring analytical data in quality control program are described qualitatively. In the final part of this paper, some important remarks for the preparation of collaborative trials, including the evaluation of accuracy and reproducibility of analytical method are also given.

BENTONITE-QUARTZ SAND AS THE BACKFILL MATERIALS ON THE RADIOACTIVE WASTE REPOSITORY Raharjo Raharjo
Indonesian Journal of Chemistry Vol 5, No 2 (2005)
Publisher : Universitas Gadjah Mada

An investigation of the contribution of quartz sand in the bentonite mixture as the backfill materials on the shallow land burial of radioactive waste has been done. The experiment objective is to determine the effect of quartz sand in a bentonite mixture with bentonite particle sizes of -20+40, -40+60, and -60+80 mesh on the retardation factor and the uranium dispersion in the simulation of uranium migration in the backfill materials. The experiment was carried out by the fixed bed method in the column filled by the bentonite mixture with a bentonite-to-quartz sand weight percent ratio of 0/100, 25/75, 50/50, 75/25, and 100/0 on the water saturated condition flown by uranyl nitrate solution at concentration (Co) of 500 ppm. The concentration of uranium in the effluents in interval 15 minutes represented as Ct was analyzed by spectrophotometer, then using Co and Ct, retardation factor (R) and dispersivity () were determined. The experiment data showed that the bentonite of -60+80 mesh and the quartz sand of -20+40 mesh on bentonite-to-quartz sand with weight percent ratio of 50/50 gave the highest retardation factor and dispersivity of 18.37 and 0.0363 cm, respectively.

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