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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 31 Documents

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Search results for , issue "Vol 8, No 3 (2008)" : 31 Documents clear

SEPARATION AND IDENTIFICATION OF NORMAL HYDROCARBON, NONADECANE IN THE CABBAGE VEGETABLES SAMPLES (Brassica oleracea VAR. CAPITATA F. ALBA) BY GAS CHROMATOGRAPHY–MASS SPECTROMETRY M. Amzad Hossain; S. M. Salehuddin; M. J. Kabir
Indonesian Journal of Chemistry Vol 8, No 3 (2008)
Publisher : Universitas Gadjah Mada

Toxic normal hydrocarbon (NH), nonadecane in the methanolic extract of the whole of cabbage samples collected from different districts of Bangladesh was analyzed by GC-MS. It was observed that NH deposition on the samples takes place in different morphological parts of the biological materials. The NH, nonadecane, was found in the cabbage samples collected from the highway road side by the extraction of methanol. The identification and quantification of the title compounds have not been reported previously in the cabbage sample.

EFFECT OF HIRA PROTEIN ON TRANSCRIPTIONAL REGULATIONS OF GENES IN VERTEBRATE CELLS Ahyar Ahmad
Indonesian Journal of Chemistry Vol 8, No 3 (2008)
Publisher : Universitas Gadjah Mada

For better understanding of DNA replicating-coupled chromatin assembly and transcription regulation in eukaryotes, we studied biochemical and genetic analysis of nuclear-related proteins from chicken DT40 cell lines. The genetic analysis of some nuclear proteins, such as HIRA and CAF-1, indicated that these proteins could play overlapping roles in chromatin dynamics and is consistent with the finding that HIRA protein exhibited binding ability to histones and ASF-1, as also ASF-1 bound directly with CAF-1p60. In this study, revealed not only that the N-terminal and C-terminal halves of HIRA mediate individually transcription repressions but also that even one of the seven WD dipeptide motifs and the LXXLL motif of HIRA are required for these mediations in vivo. Finally, we found that HIRA-mediated repression is sensitive to tricostatin TSA and it co-represses transcription together with HDAC-2. We believe our findings will contribute to a major break-through in future studies on the specific, individual roles of HIRA involved in numerous DNA-utilizing processes, through the formation and/or maintenance of the chromatin structure in vertebrate cells.

ADSORPTION MODEL OF Mn2+, Cd2+ and Hg2+ IN THE WATER - SEDIMENT SYSTEMS ALONG CODE RIVER, YOGYAKARTA Muzakky Muzakky
Indonesian Journal of Chemistry Vol 8, No 3 (2008)
Publisher : Universitas Gadjah Mada

Prediction of adsorption model of Mn2+, Cd2+ and Hg2+ in water-sediment systems along Code River, Yogyakarta has been experimentally investigated. The aim of this investigation is to predict the transfer models based on isotherm adsorption of Mn2+, Cd2+ and Hg2+ metal ions from water into sediment. In addition, this investigation is expected to be able to inform the initial condition of Code River, dynamics, and the fate of Mn2+, Cd2+ and Hg2+ ions from upstream to downstream. Based on the investigation the transfer of Mn2+, and Cd2+ ions into sediment follows Langmuir adsorption model, with the coefficient determination (R2) of 0,9916 and 0,9799, while the value of the adsorption energy are 20,95 kJ/mol and 16,85 kJ/mol. The transfer of Hg2+ ion tend to follow Freundlich adsorption model. From the adsorption energies, it is proven that Mn2+ ion was chemically sorpted into the sediment, while Cd2+ ion will tend to be physically sorpted into the sediment. The binding strength of which ise in the order of Mn2+> Cd2+ and the adsorption energy of Hg2+ion couldnot be determined.

1D AND 2D NMR STUDIES OF BENZYL O–VANILLIN Mohammed Hadi Al–Douh; Shafida Abd Hamid; Hasnah Osman
Indonesian Journal of Chemistry Vol 8, No 3 (2008)
Publisher : Universitas Gadjah Mada

The reaction of o-vanillin A with benzyl bromide B2 in acetone as the solvent and K2CO3 as a base in the presence of tetra-n-butylammonium iodide (TBAI) as catalyst formed benzyl o-vanillin, C. The complete assignments of C using PROTON, APT, DEPT-135, COSY, NOESY, HMQC and HMBC NMR in both CDCl3 and acetone-d6 are discussed, and the coupling constants J are reported in Hertz (Hz).

THE ANTIBACTERIAL COMPOUND COLLISMICIN A DERIVED FROM MARINE Streptomyces sp Q-629K Tutik Murniasih; Kyoko Adachi
Indonesian Journal of Chemistry Vol 8, No 3 (2008)
Publisher : Universitas Gadjah Mada

In our course of screening for secondary metabolite derived from marine bacterial, we isolate the antimicrobial compound collysmicin A from the ethyl acetate extract of Streptomyces sp Q-629K. Separation of this compound was carried out by silica gel open column chromatography. Purification of an active compound was done using HPLC C18 with acetonitril-water system. Determination of chemical structure was done by 1H, 13C NMR and LC-MS analysis. Collysmicin A was contained in fraction 3, fraction 7.2 and fraction 8.7. The antimicrobial assayed from purified compound Fr.8.7 gave diameter inhibition approximately 13 mm against S. aureus and 12 mm against B. subtilis.

IMMOBILIZATION OF PAPAIN ON CHITOSAN Sari Edi Cahyaningrum; Narsito Narsito; Sri Juari Santoso; Rudiana Agustini
Indonesian Journal of Chemistry Vol 8, No 3 (2008)
Publisher : Universitas Gadjah Mada

In this study, papain was immobilized on chitosan with Mg(II) cosslinked agent. Studies on free and immobilized papain systems for determination of optimum pH, optimum temperatur, thermal stability and reusability were carried out. The results showed that free papain had optimum pH 6.5 and optimum temperature 55 °C while the immobile papain hadoptimum pH 8 and optimum temperature 80 °C. The thermal stability of the immobilized papain, relative to that of the free papain, was markedly increased. The immobilized papain can be reused for at least six times.

LATTICE ENERGY DETERMINATION AND MOLECULAR SIMULATION OF PEROVSKITE OXIDES Hellna Tehubijuluw; Ismunandar Ismunandar
Indonesian Journal of Chemistry Vol 8, No 3 (2008)
Publisher : Universitas Gadjah Mada

Determination of lattice energy, U, is an important work for ionic compounds, due to it is the driving force in the compounds formation. The objective this work are twofold, firstly to determine lattice energy of perovskite oxide using an approximate equation and compare lattice energy from the resulted simple equation and molecular simulation results. The perovskite oxides used on this study were rare-earth orthoferite (LnFeO3) and aluminate (LnAlO3). These ionic terner compounds adopt space group Pbnm or R-3c. Lattice energy of perovskite oxides were calculated using Glasser, (G), Glasser-Jenkins, (GJ), and Yoder-Flora, (YF) equations. Plots of Born-Haber lattice energies (U(BHC)) vs. U(G), U(GJ) and U(YF) resulted in R2 = 0.8872, 0.5919, and 0.9982. Thus the obtained best fit was U(BHC) vs. U(YF). The simple equation describing the best plot wasUperovskite oxide =[1,0579U(YF) - 835,06] kJ/mol. Molecular simulation method has also been carried out to determine lattice energy and the obtained results were compared with those obtained from simple lattice energy equation, good agreement were obtained in these two oxides series. The obtained structural parameters also agreed well with those obtained from X-ray diffraction studies.

PARTIAL CHARACTERIZATION of lipase from COCOA BEANS (Theobroma cacao. L.) of clone PBC 159 Ratna Agung Samsumaharto
Indonesian Journal of Chemistry Vol 8, No 3 (2008)
Publisher : Universitas Gadjah Mada

A study was carried out to characterize the cocoa lipase from cocoa beans (Theobroma cacao, L.) of clone PBC 159. The optimum temperature of cocoa lipase was 30-40 °C and the pH optimum was 7.0-8.0. The moleculer weight of the lipase enzyme was in between 45-66 kDa. The results indicate that Km value for cocoa bean lipase was 2.63 mM, when trimyristin was used as a substrate. The incubation of cocoa bean lipase with triolein and tributyrin (as substrate) yielded Km of 11.24 and 35.71 mM, respectively. The Vmax value obtained from the incubation of the lipase with a wide range of substrates, including tributyrin, trimyristin and triolein, are expressed as µmole acid/min/mg protein for cocoa lipase. Vmax values decreased with the increase in the triacylglycerol chain-length, with Vmax values of 27.78, 13.16 and 11.63 µmole acid/min/mg protein when incubated with tributyrin, trimyristin and triolein, respectively. Inhibition of lipase occurred in the presence of diisopropyl flourophosphate, N-bromosuccinimide and 5,5-dithiobis-(-2-nitrobenzoic acid).

PREPARATION OF CHITOSAN-GOLD NANOPARTICLES: PART 2. THE ROLE OF CHITOSAN Adlim Adlim; Mohamad Abu Bakar
Indonesian Journal of Chemistry Vol 8, No 3 (2008)
Publisher : Universitas Gadjah Mada

Colloidal gold nanoparticles prepared by employing chitosan as the stabilizer in solvent of methanol-acetic acid solution were stable for months without precipitation. The mole ratio of chitosan-gold ions of 5:1 - 30:1 gave dispersed and fine gold particles in range of 9.4-10.4 nm. Gold reduction in chitosan matrix was faster at higher chitosan concentration, and molar ratio of chi : Au, from 5:1 to 40:1. Higher acidity of acetic acid (pH 2-6) led to faster reduction of gold ions. The intensity of gold metal colloid plasmon band increased at higher concentration of acetic acid. Chitosan functioned both as a stabilizer and a reducing agent for gold ions. Gold colloidal particles immobilized on chitosan coated TiO2 as the solid support gave more dispersed and smaller particles (4.6 nm) compared with gold particles supported on TiO2 without chitosan coating.

SYNTHESIS, IDENTIFICATION AND IN VITRO ANTITUMOUR PRESCREENING TEST OF TRIPHENYLTIN BENZOATE TOWARDS A HUMAN CERVICAL CARCINOMA CELL LINE, HeLa Ida Bagus Putra Manuaba
Indonesian Journal of Chemistry Vol 8, No 3 (2008)
Publisher : Universitas Gadjah Mada

In this study, triphenyltin benzoate was synthesized first, and followed by antitumor prescreening test of the compound towards a human cervical carcinoma cell line, HeLa. Three reaction steps were employed to obtain the compound needed, i.e. 1) synthesizing of tetraphenyltin compound via insitu phenilmagnesiumbromide Grignard reaction to tin(IV)chloride, 2) synthesizing triphenyltin chloride via redistribution reaction of tetraphenyltin to tin(IV) chloride without any solvent, the reaction completed depends on the temperature, in this case a good results was achieved at temperature 220 °C for 6 h, 3) finally, triphenyltin benzoate was produced through a methathetical reaction of triphenyltin chloride to an excess of sodium benzoate in ethanol. In vitro prescreening antitumour activity of the compound towards a human cervical tumour cell line, HeLa was carried out following an enzyme linked immunosorbent assays (ELISA). By this method, the test ended with good promising results. This indicates by the IC50 of 170 nM which is compared well to cisplatinum with IC50 950 nM.

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