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INDONESIA
Indonesian Journal of Chemistry
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 23 Documents
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Search results for , issue "Vol 8, No 1 (2008)" : 23 Documents clear
ISOLATION AND PURIFICATION OF LIPASE FROM COCOA BEANS (Theobroma cacao. L.) OF CLONE PBC 159 Ratna Agung Samsumaharto
Indonesian Journal of Chemistry Vol 8, No 1 (2008)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1396.826 KB) | DOI: 10.22146/ijc.21654

Abstract

Lipase (triacylglycerol acylhydrolase, EC 3.1.1.3) was extracted and purified from acetone dry powder of cocoa (Theobroma cacao. L.) of clone PBC 159 extract. The Lipase  from AcDP of cocoa beans was used for purification using 40-60 and 60-80% ammonium sulphate precipitation. The resulted indicated 44.73 and 60.51-fold purification with 26.74 and 33.31% recovery lipase activity (yield), respectively. The crude lipase enzyme from both precipitation were eluted, producing a single peak after applying through Sephacryl S-200 chromatography. The purified enzyme had a uniform specific activity throughout the final chromatography peak. The results from SDS-PAGE analysis showed that the molecular weight of the lipase enzyme was in between 45-66 kDa.
INHIBITION OF HUMAN LOW-DENSITY LIPOPROTEINS OXIDATION BY Hibiscus radiatus CUV. CALYCES EXTRACT Hernawan Hernawan
Indonesian Journal of Chemistry Vol 8, No 1 (2008)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (130.88 KB) | DOI: 10.22146/ijc.21655

Abstract

Hibiscus radiatus Cuv calyces extracts rich in polyphenols was screened for their potential to inhibit oxidation of human low-density lipoproteins-cholesterol (LDL-C) in vitro. The inhibition of LDL-C oxidation (antioxidant activity) was determined by measuring the formation of conjugated dienes and thiobarbituric acid reagent substances (TBARS). LDL-C oxidation was carried out in the presence of H. radiatus Cuv calyces extract (20 and 50 μM). CuSO4 (10 μM) was used as the oxidation initiator and  butylated hydroxytoluene (BHT) at 50 μM was used as standard antioxidant. The protective effect of H. radiatus Cuv. calyces extract toward human low-density lipoproteins, complex lipid system was  demonstrated by significant increase lag time (> 103 min), diminished of the propagation rate (44 %), and diminution of conjugated dienes formation 59.42 % (50 μM) compared to control.
A REVISIT OF PECHMANN REACTION UNDER MICROWAVE RADIATION Fauzia Anjum Chattha; Saeed Ahmed Nagra; Munawar Ali Munawar
Indonesian Journal of Chemistry Vol 8, No 1 (2008)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1077.451 KB) | DOI: 10.22146/ijc.21659

Abstract

A series of coumarins have been prepared by the Pechmann reaction of different phenols with ethyl acetoactate as well as malic acid using catalytic amount of sulfuric acid under microwave irradiation for few seconds.

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