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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).

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Articles 18 Documents

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Search results for , issue "Vol 11, No 1 (2011)" : 18 Documents clear

SYNTHESIS OF THIOMETHYLATED CALIX[4]RESORCINARENE BASED ON FENNEL OIL VIA CHLOROMETHYLATION Suryadi Budi Utomo; Jumina Jumina; Dwi Siswanta; Mustofa Mustofa; Naresh Kumar
Indonesian Journal of Chemistry Vol 11, No 1 (2011)
Publisher : Universitas Gadjah Mada

A research has been conducted to synthesize thiomethylated-C-4-methoxyphenylcalix[4]resorcinarene using fennel oil as a starting material. The synthesis was carried out in four steps i.e. (1) oxidation of anethole to yield p-anisaldehyde, (2) HCl-catalyzed condensation of p-anisaldehyde with resorcinol, (3) chloromethylation of C-4-methoxyphenylcalix[4]resorcinarene with paraformaldehyde and HCl in the presence of ZnCl2 to yield tetrakis-chloromethyl-C-4-methoxyphenylcalix[4]resorcinarene, and (4) reaction of tetrakis-chloromethyl-C-4-methoxyphenylcalix[4]resorcinarene with thiourea followed by hydrolysis with sodium hydroxide solution to yield tetrakis-thiomethyl-C-4-methoxyphenylcalix[4]resorcinarene. The prepared compounds were characterized based on melting point, FT-IR, and NMR spectrometers. According to the analysis of 1H-NMR spectrometer, C-4-methoxyphenylcalix[4]resorcinarene and tetrakis-chloromethyl-C-4-methoxyphenylcalix[4]resorcinarene were observed in the chair or flattened partial cone conformation, while tetrakis-thiomethyl-C-4-methoxyphenylcalix[4]resorcinarene tend to exist in the crown or cone conformation.

ANTIMALARIAL COMPOUNDS FROM ENDOPHYTIC FUNGI OF BROTOWALI (Tinaspora crispa L) Elfita Elfita; Muharni Muharni; Munawar Munawar; Leni Legasari; Darwati Darwati
Indonesian Journal of Chemistry Vol 11, No 1 (2011)
Publisher : Universitas Gadjah Mada

The term endophytic refers to a bacteria or a fungi microorganism that colonizes interior organs of plants, but does not have pathogenic effects on its host. In their symbiotic association, the host plant protects and feeds the endophytic, which ";in return"; produces bioactive metabolites to enhance the growth and compotitiveness of the host and to protect it from herbivores and plant pathogens. Plants with ethnobotanical history, for example brotowali (Tinaspora crispa L), are likely candidates to find bioactive compounds. Two alkaloids have been isolated from endophytic fungi of brotowali. The molecular structures of the isolated compounds were determined based on spectroscopic data, including UV, IR, NMR 1D and 2D spectrum. The compounds were determined as: 7- hydroxy-3,4,5-trimethyl-6-on-2,3,4,6-tetrahydroisoquinoline-8-carboxylic acid (1) and 2,5-dihydroxy-1-(hydroxymethyl)pyridin-4-on (2). The compound has antimalarial activity against Plasmodium falciparum 3D7, with IC50 values 0,129 µM and 0,127 µM.

ENRICHMENT OF α-( ALPHA) LINOLENIC ACID OF BASIL SEED OIL, Ocinum Basillium L. BY FRACTIONAL CRYSTALIZATION AND CRYSTALIZATION IN UREA INCLUSION COMPLEXES Warsito Warsito; Jumina Jumina; Chairil Anwar; Rurini Retnowati; Ahmad Ghanaim; Suleman Duengo
Indonesian Journal of Chemistry Vol 11, No 1 (2011)
Publisher : Universitas Gadjah Mada

Enrichment of α-(alpha) linolenic acid (ALA) of basil seed oil, Ocinum basilicum L. can be done by fractional crystalization and crystalization of fatty acid in urea inclusion complexes (UIC) methods. In this research, the ALA of fatty acid of basil seed oil was fractionated by fractional crystallization in methanol solution at -3, -13 and -25 °C and by crystallization in urea solution (ratio 1:2) at 4, 2, -6 and -8 °C. The ALA percentages were analyzed by GC and GC/MS. The results showed that percentage of ALA obtained from fractional crystallization at -25 °C increase from 65.16 to 91.40, and acquired from UIC is 98.8 at 2 °C

MODIFIED KAOLIN WITH CATIONIC SURFACTANT FOR GIBBERELLIC ACID CARRIER MATERIALS Sunardi Sunardi; Utami Irawati; Yateman Arryanto; Sutarno Sutarno
Indonesian Journal of Chemistry Vol 11, No 1 (2011)
Publisher : Universitas Gadjah Mada

Synthesis of surfactant modified kaolin from natural kaolin from Tatakan, Tapin, South Kalimantan and its application for carrier material of gibberellic acid have been conducted. The kaolin modification was done by surface engineering using cationic surfactant cetyltrimethylammonium bromide (C16TMABr). The characterizations of kaolin and surfactant modified kaolin were carried out by XRF, SEM, XRD, FTIR and TGA/DTA. The adsorption capacity of kaolin was determined by Langmuir adsorption isotherm model. The result showed that kaolin from Tatakan, South Kalimantan consist of kaolinite, halloysite, quartz, chlorite, and christobalite. Surface modification using cationic surfactant showed that increasing surfactant content onto kaolin was proportional to the amount of surfactant loaded. Gibberellic acid was partitioned into the organic phase created by the surfactant tails of the C16TMA+ modified kaolin. The calculations result by Langmuir adsorption isotherm model showed that the highest increasing adsorption capacity occurred on surfactant modified kaolin with surfactant/CEC ratio of 2.0, with the adsorption capacity of 28.41 mg/g.

DETERMINATION OF CONSECUTIVE REACTION RATE CONSTANTS BETWEEN GLYCINE AND ISOLEUCINE WITH o-PHTHALDIALDEHYDE AND 2-MERCAPTOETHANOL FROM SINGLE EXPERIMENT DATA Iip Izul Falah; Triyono Triyono; Catur Atmaji
Indonesian Journal of Chemistry Vol 11, No 1 (2011)
Publisher : Universitas Gadjah Mada

Kinetics study of chemical reaction is important in producing optimum product, designing a reactor, analyzing a compound, and many other purposes. This work presents the result of study of consecutive pseudo first order reaction between glycine and isoleucine with o-phthaldialdehyde and 2-mercaptoethanol in borate buffer solution at pH=9.0. Continuous detection was used to follow the change of fluorescence intensity of formed isoindole during the reaction. Although concentrations of initial compound and its derivative were not known; by using iteration method, the reaction constants could be determined with high precision from single experiment data. Result of the work showed that reaction rate constants k1 and k2 for consecutive reaction of glycine with excess of o-phthaldialdehyde and 2-mercaptoethanol were 18.75x10-3 and 26.70x10-5 s-1, respectively; whereas for isoleucine were 6.06x10-3 and 12.59x10-5 s-1, respectively.

SYNTHESIS OF POLYPROPYLCALIX[6]ARENE FROM p-t-BUTYLPHENOL AS ADSORBENT FOR Cr(III) METAL ION Susy Yunita Prabawati; Jumina Jumina; Sri Juari Santosa; Mustofa Mustofa
Indonesian Journal of Chemistry Vol 11, No 1 (2011)
Publisher : Universitas Gadjah Mada

A study has been conducted to synthesize a novel polypropylcalix[6]arene polymer using p-t-butylphenol as a starting material. It was of interest to investigate the capability of the polymer with a tunnel-like structure, as adsorbent to trap the heavy metal cation such as Cr3+. The synthesis was carried out in several steps i.e (1) formation of p-t-butylcalix[6]arene from p-t-butylphenol as a starting material, (2) treatment of p-t-butylcalix[6]arene with 4.95 equivalents of allyl bromide under alkaline conditions to yield p-t-butyl-37,40-diallyloxy-38,39,41,42-tetra-hydroxy-calix[6]arene, and (3) polymerization of p-t-butyl-37,40-diallyloxy-38,39,41,42-tetrahydroxycalix[6]arene by treatment with concentrated sulfuric acid to yield polypropyl-calix[6]arene. The application of polypropylcalix[6]arene for trapping Cr(III) was investigated by stirring the suspension of calixarene under variation of pH, time, and adsorbent mass. IR and 1H NMR spectra, showed that two allyl groups had been incorporated to the lower rim of the p-t-butylcalix[6]arene and the polymer was obtained as brownish green crystals with the melting point of 108-110 °C. The study also showed that the polypropylcalix[6]arene was able to trap Cr(III) cation. The optimum adsorption conditions were achieved at pH 5, contact time 60 min and concentration 12 mg/l for every 0,008 g of polymer.

PHOSPHOLIPIDS FROM PUMPKIN (Cucurbita moschata (Duch.) Poir) SEED KERNEL OIL AND THEIR FATTY ACID COMPOSITION Tri Joko Raharjo; Laily Nurliana; Sabirin Mastjeh
Indonesian Journal of Chemistry Vol 11, No 1 (2011)
Publisher : Universitas Gadjah Mada

The phospholipids (PL) of pumpkin (Cucurbita moschata (Duch) Poir) seed kernel and their fatty acid composition were investigated. The crude oil was obtained by maceration with isopropanol followed by steps of extraction yielded polar lipids. The quantitative determination of PLs content of the dried pumpkin seed kernel and their polar lipids were calculated based on the elemental phosphorus (P) contents which was determined by means of spectrophotometric methods. PL classes were separated from polar lipids via column chromatography. The fatty acid composition of individual PL was identified by gas chromatography-mass spectrometry (GC-MS). The total of PL in the pumpkin seed kernels was 1.27% which consisted of phosphatidylcholine (PC), phosphatidylserine (PS) and phosphatidyletanolamine (PE). The predominant fatty acids of PL were oleic and palmitic acid in PC and PE while PS's fatty acid were dominantly consisted of oleic acid and linoleic acid.

CRYSTALLINE PHASE REACTIVITY IN THE SYNTHESIS OF FLY ASH-BASED GEOPOLYMER Lukman Atmaja; Hamzah Fansuri; Anggaria Maharani
Indonesian Journal of Chemistry Vol 11, No 1 (2011)
Publisher : Universitas Gadjah Mada

Aluminosilicate, alkaline solution and fly ash from a power plant have been used to synthesize geopolymer at ambient temperature. SiO2/Al2O3 mole ratio of the starting materials was varied by the addition of pure, insoluble corundum and quartz. The geopolymer exhibited some differences in the ratio of initial reaction mixtures and that of final products. The corundum gave no influence to the compressive strength while the quartz at SiO2/Al2O3=4.0-6.0 produced significant change in the strength. The highest compressive strength achieved was 65 MPa. XRD using analysis Rietveld method proved that quartz has been found both in starting materials as well as in the geopolymer indicating the involvement of crystalline phases, to some extent, in geopolymerization process.

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