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Program Studi Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Udayana Kampus Bukit Jimbaran, Jimbaran, Bali, Indonesia
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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 13 Documents
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Search results for , issue "Vol. 7, No. 1 Januari 2013" : 13 Documents clear
PENINGKATAN AKTIVITAS SELULASE PADA TANAH HUTAN MANGROVE PANTAI SUWUNG BALI DENGAN PENGAYAAN SUBTRAT SELULOSA JANUR KELAPA (Cocos nucifera) Ika Kurniawati; I Nengah Wirajana; I Gede Mahardika
Jurnal Kimia (Journal of Chemistry) Vol. 7, No. 1 Januari 2013
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 (113.45 KB) | DOI: 10.24843/JCHEM.2013.v07.i01.p10

Abstract

The aim of this study is to determine the effect of coconut (Cocos nucifera) leaf enrichment to soil of mangrove forest of Bali Suwung coastal on the cellulase activity. The measurement of cellulase activity was conducted by CMC method (Carboxymethyl Cellulose Assay) on soil sample with and without enrichment of coconut leaf substrate in incubation time of 1, 2, 3, and 4 weeks. The results showed that the enrichment increased cellulase activity. In addition, cellulase activited the soil samples, increase with incubation times.  
PENGARUH KONSENTRASI AMMONIUM SULFAT ((NH4)2SO4) SEBAGAI SUMBER NITROGEN TERHADAP PRODUKSI BIOETANOL BERBAHAN BAKU Glacilaria sp. Ni Putu Widayanti; Wiwik Susanah Rita; Yenni Ciawi
Jurnal Kimia (Journal of Chemistry) Vol. 7, No. 1 Januari 2013
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 (147.963 KB) | DOI: 10.24843/JCHEM.2013.v07.i01.p01

Abstract

The aims of this research are to determine the concentration of reducing sugar and starch in Glacilaria sp. and to investigate the influence of the concentration of ammonium sulfate as nitrogen source on the production of bioethanol using Glacilaria sp. as the carbon source. The concentrations of ammonium sulfate employed were 0,25%; 0,50%; 0,75%; and 1% (w/v). The methods employed in this research were the determination of water content, glucose and starch concentration using Nelson-Somogyi method, determinating the optimum duration of fermentation, pH measurement, and the determination of  ethanol concentration. The results showed that the concentrations of reducing sugar and starch in Glacilaria sp. are 17,14% and 15,42%. The concentration of (NH4)2SO4, which produced the optimum concentration of ethanol (1,04% (v/v) on seventh day), was 1% (w/v). The fermentation media containing (NH4)2SO4 of 1%; 0,75%; 0,5%; and 0,25% (w/v) produced optimum concentrations of ethanol, which were 0,96% (v/v) on fifth day; 0,78% (v/v) on seventh day; 0,74% (v/v) on seventh days; and 0,73% (v/v) on seventh day, respectively. The optimum concentration of (NH4)2SO4 was 1% (w/v), which produced maximum concentration of  bioethanol from Glacilaria sp., of 0,96% (v/v).
IDENTIFIKASI GOLONGAN SENYAWA AKTIF ANTIMAKAN DARI DAUN TENGGULUN (Protium javanicum Burm. F.) TERHADAP LARVA Epilachna sparsa L M. G. Agus Mandana; Ni M. Puspawati; Sri Rahayu Santi
Jurnal Kimia (Journal of Chemistry) Vol. 7, No. 1 Januari 2013
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 (170.33 KB) | DOI: 10.24843/JCHEM.2013.v07.i01.p06

Abstract

Protium is the main genusl in the family of Burseraceae which has been used traditionally as medicine, cosmetic as well as insecticide. This research aimed to isolate and identify antifeedant active compounds from leaf of Protium javanicum Burm, F which is locally known as tenggulun. Epilachna sparsa (E.sparsa) larvae were used as bioindicator for antifeedant activity assay. The assay was performed both on crude extract, fractions, and isolate. Dried leaf powder of tenggulun (1000 g) was extracted with methanol to yield 20.89 g dark green extract. This extract showed 71.61% antifeedant activity at 0.1% (b/v). This active extract was then fractionated into n-hexane, chloroform and water fractions. The chloroform fraction was the most active which give 89.62% activity at 0.1% (b/v) compared to n-hexane (36.83%), and water fractions (1.96 %). Purification of chloroform fraction was done using silica gel column chromatography with n-hexane : chloroform (3:4) as eluent and three groups of fractions (isolates) were obtained. The most active isolate which showed 70.53% antifeedant activity at 10 ppm was found relatively pure, therefore it was then identified.  Based on phytochemical reaction, analysis of infrared spectra and ultraviolet-visible spectra, the antifeedant active isolate was identified as triterpenoid class of compounds which have functional group such as OH, CH3, CH2, C=O, C=C and ?max at 245 and  416  nm.

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