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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 15 Documents

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Search results for , issue "Vol 14, No 3 (2014)" : 15 Documents clear

Fast Swelling Superabsorbent Hydrogels Starch Based Prepared by Gamma Radiation Techniques Erizal Erizal; Dian Pribadi Perkasa; Basril Abbas; Sudirman Sudirman; Sulistioso G.S.
Indonesian Journal of Chemistry Vol 14, No 3 (2014)
Publisher : Universitas Gadjah Mada

Fast swelling hydrogels were synthesized from the mixture of acrylamide (AAM)-acrylic acid (AA)-starch (15:5:1 w/v) solution by radiation crosslinking with varying irradiation doses (7.5-12.5 kGy) at room temperature. The copolymers were characterizated by Fourier transform infra red spectroscopy (FTIR) and Differential scanning calorimetry (DSC). It was found that hydrogels showed superabsorbent properties with higher swelling capacities (~400 g/g) and reached at a very short time (3 min). There was no significance difference between the effect irradiation dose on swelling of hydrogels. The hydrogels were also found to sensitive to the ionic strength of medium. The FTIR spectra and thermogram DSC of hydrogels were confirmed the crosslinking occurs in the hydrogels.

Cytotoxic Isobractatin (Prenylated Xanthone) Epimer Mixture of Garcinia eugenifolia Sri Hartati; I Ketut Triyono; Sri Handayani
Indonesian Journal of Chemistry Vol 14, No 3 (2014)
Publisher : Universitas Gadjah Mada

In search of bioactive anti-cancer compounds from natural products has been found isobractatin from n-hexane extract of Garcinia eugenifolia. Isolation was done through the stages of maceration and column chromatography. Elucidation of the structure was analyzed by spectroscopy of UV-Vis, FTIR, LC-MS, NMR proton and carbon one and two dimension data. The results found three compounds isolated from G. eugenifolia. The three compounds were stigmasterol, prenylated xanthone isobractatin and its epimer (in a mixture). The mixture of isobractatin and its epimer showed cytotoxic activity against breast cancer cell line T47D with IC50 = 17 µg/mL.

Simulation of Pollutant Gas Dispersion on Case Study of Lontar 3 Coal Fired Power Plant in Addition into 1 x 660 MW Capacity in Kemiri, Tangerang District, Banten Province Eko Sugiharto; Taufik Abdillah Natsir; Abdul Rozaq
Indonesian Journal of Chemistry Vol 14, No 3 (2014)
Publisher : Universitas Gadjah Mada

Air quality simulation has been performed for additional capacity of Banten 1 x 600 MW Coal Fired Power Plant toward air quality degradation in its surrounding environment. The simulation was based on pollutant gas dispersion calculated using Gaussian Plume equation. The research has involved climate secondary data on Cengkareng climatology Station for last 10 years. Besides, the primary data has also been taken in 7 point sampling locations to determine initial ambient air quality of existing 1 x 600 MW Coal Fired Power Plant. The data of existing 1 x 600 MW coal fired power plant has been taken from Adipala Steam Power Plant while the gas pollutant dispersion simulation has been done well using Gaussian Plume equation. The result showed that gas emission for NO2, and TSP parameter in all scenarios and SO2 gas parameter in several scenarios were exceeding the Threshold Limit Value. Thus, a technology is needed to minimize produced emission gas. The increase of gas pollutant in all sampling locations was not significantly increasing and those gas pollutants were not generally exceeding the Threshold Limit Value permitted by the government regulation.

Di-(2-ethylhexyl)phthalate and Pyranon Derivated from Endophytic fungi Penicillium sp the Leave of Kunyit Putih (Curcuma zedoaria) Muharni Muharni; Fitrya Fitrya; Milanti Okta Ruliza; Dwi Anjar Susanti; Elfita Elfita
Indonesian Journal of Chemistry Vol 14, No 3 (2014)
Publisher : Universitas Gadjah Mada

Two compounds from cultivation of the endophytic fungi Penicillium sp of leaves of kunyit putih (Curcuma zedoaria have been isolated. The endophytic fungus was cultivated on 5 L of Potatos Dextrose Broth (PDB) medium at room temperature (no shaking) for 3 weeks. The cultures were extracted with ethyl acetate to afford 3.0 g of residue after removal of the solvent under reduced pressure. The extract was separated and purified by silica gel column chromatography (CC) and afforded two pure compounds as colorless oily liquid (compound 1) and yellow crystal (compound 2). The structure of these compounds were characterized by detailed UV, IR, and NMR spectroscopic analysis and compound 1 as well as comparison with the reported data. Base on spectra analysis the compound 1 was determined as Di-(2-ethylhexyl)phthalate and compound 2 as 5-(4’-ethoxy-2’-hydroxy-5’-methyl-2’,3’-dihydrofuran-3’-il (hydroxy) methyl-4-isopropyl-3-methyl-2-pyran-2-on). Compound 1 is not new compound, but it is new for endophytic fungus from C. zeodoria and compound 2 is new compound.

Production of Reducing Sugar from Cassava Solid Waste by Simultaneous Ultrasonication and Acid Hydrolysis Wasinton Simanjuntak; Heri Satria; Nurul Utami
Indonesian Journal of Chemistry Vol 14, No 3 (2014)
Publisher : Universitas Gadjah Mada

In this study, acid hydrolysis of cassava solid waste under ultrasound irradiation for reducing sugar production was studied. A series of experiments was carried out under a 40 kHz ultrasound irradiation, with the main purpose to examine the effect of pHs, hydrolysis times, and temperatures on the concentration of reducing sugar produced. As a control an untreated sample was subjected to thermal hydrolysis under the optimum condition obtained from the hydrolysis experiments under ultrasound treatment. The results obtained indicated that the highest reducing sugar concentration was obtained from the experiment undertaken at pH = 2.0; hydrolysis time of 90 min, and temperature of 80 °C. Experiment conducted at this optimum condition was found to produce reducing sugar with the concentration of 801 mg/L. This concentration around 11 times over that produced from control sample, demonstrating that simultaneous ultrasonication and hydrolysis is far more effective than conventional thermal hydrolysis. This hydrolysis improvement is attributed to the ultrasound stimulated degradation of starch molecules, leading to accelerated hydrolysis due to the cavitations of the molecules, as evidently shown by the result of SEM characterization of the original and ultrasonicated sample.

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