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Jurnal Kimia (Journal of Chemistry)
Published by Universitas Udayana
ISSN : 19079850     EISSN : 25992740     DOI : 10.24843/JCHEM
Core Subject : Science,
Chemistry
Jurnal Kimia (Journal of Chemistry) publishes papers on all aspects of fundamental and applied chemistry. The journal is naturally broad in scope, welcomes submissions from across a range of disciplines, and reports both theoretical and experimental studies.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 12 Documents
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Search results for , issue "Vol. 4, No. 2 Juli 2010" : 12 Documents clear
DEGRADASI KOLESTEROL DAN KOPROSTANOL DALAM SEDIMEN SUNGAI Iryanti Eka Suprihatin
Jurnal Kimia (Journal of Chemistry) Vol. 4, No. 2 Juli 2010
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (90.968 KB)

Abstract

Cholesterol and other steroid compounds like coprostanol, epicoprostanol, have been used as sourceindicator for fecal pollution in aquatic environments. This is because of the unique steroid composition of animalfeces. To determine the source of fecal pollution, the ratios of steroid compounds in the sample are used. Thus anyreaction or changes to any steroid compound in the environment will affect the determination. In this paper a studyon the interconversion of cholesterol and coprostanol in river sediments is reported. The study suggests that there isno such changes that any steroid compounds detected in a sediment sample will show their primary sources. Thisimplies that the composition or ratio of the compounds can be used as source indicator for fecal pollution. The studyalso found that both cholesterol and coprostanol degradation are first order with rate constants of0,063[kolesterol]mgL-1day-1 and 0.045[kop]t mgL-1day-1 respectively.
EKSTRAKSI ZAT WARNA ALAMI CAMPURAN BIJI PINANG, DAUN SIRIH, GAMBIR DAN PENGARUH PENAMBAHAN KMnO4 TERHADAP PEWARNAAN KAYU JENIS ALBASIA N. W. Bogoriani
Jurnal Kimia (Journal of Chemistry) Vol. 4, No. 2 Juli 2010
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (124.468 KB)

Abstract

The research about extraction of natural dies from the mixtures of areca nut, betel leaf, gambier, and theeffect of addition of KMnO4 towards surface coloration of albasia wood (Paraserianthes falcataria) was carried out.The extraction of mixture of natural dye was conducted by heating in water for two hours. 10,00 gram of eachsamples of betel leaf, areca nut, and gambier were refluxed and resulted in 28,60%, 40,10%, and 30,20%respectively. According to fitochemical test, the betel leaf extract contain flavonoid, tannin, and carotenoid, whereasthe areca nut and gambier extracts contain flavonoid and tannin.The optimum mass ratio and mass of KMnO4 for coloration were resulted in optimum mass 10:10:5 and0,25 gram respectively. This showed that the addition of KMnO4 strengthen the bond between dye and wood fiberand sharpen the resulted color. This was proven by color endurance test by soaking the object in 1% of detergentwater for 15 minutes. The dye without KMnO4 was easy to fade out, whereas the dye with KMnO4 was moreresistant. The resulted color varies from reddish brown, brown, to deep brown.

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