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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 14 Documents
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Search results for , issue "Vol. 6, No. 2 Juli 2012" : 14 Documents clear
SINTESIS DAN KARAKTERISASI SENYAWA OKSOTRINUKLIR [Ru2Co(O)(OOCCH3)6(C5H5N)3](ClO4) Aldes Lesbani; Risfidian Mohadi; Nurlisa Hidayati
Jurnal Kimia (Journal of Chemistry) Vol. 6, No. 2 Juli 2012
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

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Abstract

The oxotrinuclear compound [Ru2Co(O)(OOCCH3)6(C5H5N)3](ClO4) has been synthesized using RuCl3?nH2O at room temperature under oxygen atmospheric condition. The oxotrinuclear complex was characterized by FT-IR spectrophotometer and mass spectrometer with cold spray ionization (CSI) method. The FT-IR spectra of the resulted oxotrinuclear compound show has specific vibration at 692 cm-1. This absorption is related to M3O vibration (M= metal). CSI-mass spectra of the oxotrinuclear compound show that pyridine as ligand was fragmented in oxotrinuclear compound.
PENGOLAHAN AIR LIMBAH PENCUCIAN RUMPUT LAUT UNTUK MENURUNKAN NILAI BOD DENGAN SISTEM BIOFILTRASI EKOSISTEM (SBE) I M. G. Sudyadnyana Sandhika; I W. Budiarsa Suyasa; Iryanti Eka Suprihatin
Jurnal Kimia (Journal of Chemistry) Vol. 6, No. 2 Juli 2012
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

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Abstract

The research about treatment of wastewater from seaweed washing by biofiltration system with and without microorganism enrichment has been carried out. This research aims to determine the minimum time of the biofiltration process to decrease the BOD to meet the quality standard and the capacity of the biofiltration system. The results showed that the minimum contact time to meet the quality standard (75 mg/L) for BOD is 40 hours for both system. Treatment capacities of the biofiltration system without addition of microorganisms for BOD is 6,8056 mg/L/m3hours, whereas the treatment capacities of the system with addition of microorganisms is 6,4965 mg/L/m3hours.
APLIKASI KULIT BUAH MANGGIS (Garcinia mangostana L.) SEBAGAI PEWARNA ALAMI PADA KAIN KATUN SECARA PRE-MORDANTING Manuntun Manurung
Jurnal Kimia (Journal of Chemistry) Vol. 6, No. 2 Juli 2012
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

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Abstract

The research about utilization of mangosteen skin as a natural dies on cotton by pre-mordanting methods with 1% (w/v) of lime water. The physical and chemical properties of the natural dies were tested using 1% w/v of detergent. The extraction of natural dye was conducted by heating in water with ratio 1:20 w/v for one hour. The results showed that the optimum mass of natural dye was adsorbed about 0.0402 g without mordant  and the colour was light brown.The pre-mordanting method gives optimum mass of natural dyes adsorbed of  0.0637 g, which with reddish brwon color. The color was brighter and more resistant to detergent solution.
OPTIMASI KONDISI REAKSI HIDROGENASI METIL ESTER DALAM PENINGKATAN AKTIVITAS SURFAKTAN BERBASIS MINYAK JELANTAH I Made Siaka; Yuky Astary Hermanto; Ida Ayu Gede Widihati
Jurnal Kimia (Journal of Chemistry) Vol. 6, No. 2 Juli 2012
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

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Abstract

This paper discusses the optimization of reaction condition of methyl ester hydrogenation in the process of making surfactant from used cooking oil. The synthesis of surfactant involved the esterification reaction of used cooking oil, base-catalyzed transesterification, and hydrogenation reaction of methyl ester (methyl laurate), followed by the sulfatation using sulfuric acid and neutralization using sodium hydroxide. The hydrogenation reaction was performed in the presence of Zn, as the catalyst, at various temperatures (200oC, 220oC, and 240oC) and reaction times (1, 1½, and 2 hours). The surfactant activities testing was conducted through surface tension measurement using the drop weight method and emulsion stability duration testing to find out the optimum condition of each variable.The result indicated that the temperature of the hydrogenation reaction had no effect to the activities of surfactant produced, but the time reaction had. The surfactant activities testing showed that the reaction time of the hydrogenation reaction needed to give the smallest surface tension of water (32 dyne/cm average) was 1½ to 2 hours. More over, the reaction times ware also able to give the longest emulsion stability of 450.6 seconds for cooking oil-water emulsion and 454.6 seconds for used cooking oil-water emulsion. Therefore, the reaction times of 1½-2 hours  could be categorized as the optimum reaction time.
ANALISIS KANDUNGAN MINYAK ATSIRI DAUN TENGGULUN (Protium javanicum Burm.F.) DENGAN METODE KROMATOGRAFI GAS-SPEKTROSKOPI MASSA I G. P. Sukmajaya A. P. T.; N. M. Puspawati; A. A. Bawa Putra
Jurnal Kimia (Journal of Chemistry) Vol. 6, No. 2 Juli 2012
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

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Abstract

Leaves of Tenggulun are commonly used in traditional medicine for inflammatory therapy. This research aims to analyze the chemical composition of the volatile oil extracted from Tenggulun leaf by gass chromatography (GC) coupled to mass spectrometer (MS). The volatile oil was obtained by steam distillation method. GC-MS spectra demonstrate that the volatile oil of Tenggulun leaf is constituted mainly of monoterpenes such as ?-ocimene (49.87%) and ?-pinene (0.36%) and sesquiterpenes such as ?-caryophyllene (24.95%), germacrene (4.01%), ?-humulene (2.98%), ?-elemene (2.38%), caryophyllene oxide (0.81%), ?-amorphene (0.46%), and spathulenol (2.64%).
SKRINING SELULASE DARI TANAH HUTAN MANGROVE PANTAI SUWUNG BALI I Nengah Wirajana; Ketut Ratnayani; Darma Asih Yuliana
Jurnal Kimia (Journal of Chemistry) Vol. 6, No. 2 Juli 2012
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

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Abstract

Mangrove soil has high biodiversity and well known as potential location for enzymes exploration. The aim of direct screening for cellulase of mangrove soil is to find out the cellulase activity from mangrove soil. Mangrove soils were collected from three different locations labelled as A (8o43’38.20”SL), B (8o43’46,18”SL), and C (8o43’37,38”SL). The screening was conducted by Filter Paper Assay and Carboxymethyl Cellulose Assay methods. The results showed that cellulase activities can be measured directly from mangrove soil samples of Suwung Beach-Bali. The highest cellulase activities were 0,866 U/g soil by Filter Paper Assay and4,176 ± 0,630 U/g soil by Carboxymethyl Cellulose Assay, given by soil samples C.
DETEKSI ETANOL SETELAH KONSUMSI ARAK DALAM URIN DENGAN GAS CHROMATOGRAPHY N. M. Suaniti; I. A. R. Astiti Asih; N. P. Widya Astuti
Jurnal Kimia (Journal of Chemistry) Vol. 6, No. 2 Juli 2012
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

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Abstract

Ethanol is an alcohol which is in particular concentration allowed existing in beverages. One of alcoholic beverages that is popular in Bali is arak. This kind of beverage may contain ethanol in various concentrations depending on the distillation process carried out. The aim of this study was to detect the alcohol contents in urine collected from some volunteer who have consumed arak for two weeks with the technique of Gas Chromatography Flame Ionization Detector (GC-FID). The standard solutions employed were methanol, ethanol and acetic acid, while buthanol was used as the internal standard solution. The urine samples were collected in various sampling times after two weeks arak consumption. The ethanol contents obtained after 4, 8, 12, 16, 28, and 20 hours from the last consumption were (8.86 – 8.98) x 10-2 , (8.06 – 8.46) x 10-2, (8,81 – 8.93) x 10-2, (7.47 – 7.73) x 10-2, (8.76 – 8.89) x 10-2, and (8.15 – 8.27) x 10-2% (b/v), respectively.
KADAR TOTAL SENYAWA FENOLAT PADA MADU RANDU DAN MADU KELENGKENG SERTA UJI AKTIVITAS ANTIRADIKAL BEBAS DENGAN METODE DPPH (Difenilpikril Hidrazil) Ketut Ratnayani; A. A. I. A Mayun Laksmiwati; Ni P. Indah Septian P.
Jurnal Kimia (Journal of Chemistry) Vol. 6, No. 2 Juli 2012
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

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Abstract

Honey contains a variety of compounds which function as antioxidants one of which is a phenolic compound. Monoflora honey used in this study were randu and kelengkeng honey from certain brand distributed on the market. Qualitative test with 5% FeCl3 result showed that both types of honey contain phenolic compounds. The total phenolic compounds was determined by spectrophotometry using the Folin-Ciocalteu method and gallic acid as standards, while the free radical activity was tested using the method of  DPPH (Difenilpikril hidrazil). The result of research showed that the total content of phenolic compound in randu was 1375,89 ± 134,10 mg GAE/kg, while kelengkeng honey was 1136,49 ± 39,62 mg GAE/kg. The % reduction of free radical in randu honey at the 5th minute was 62,55 ± 4,4407 % and at the 60th minute was 95,39 ± 8,5507 %. The % reduction of free radical for kelengkeng honey at the 5th minute was 44,12 ± 1,3433 %, 60th minute was 62,00 ± 0,8612 %, and for the standard of gallic acid the % reduction of free radical at the 5th minute was 41,03% and the 60th minute was 92,00%. Therefore, there was a linear correlation between the total phenolic compound of randu honey and kelengkeng honey with % reduction of its free radical.
PENURUNAN ANGKA ASAM PADA MINYAK JELANTAH Primata Mardina; Erlyta Faradina; Netty Setiawati
Jurnal Kimia (Journal of Chemistry) Vol. 6, No. 2 Juli 2012
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

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Abstract

Acid number expresses free fatty acid content that has effect on quality of oil and fat product. High acid number in resulted from hydrolysis process that occurred during frying. Acid number could be reduced by adsorption. The objective of this research was to reduce acid number from waste cooking oil using adsorption process. The activated carbon from coconut shell was used as adsorbent. A specific amount of adsorbent was added into 150 grams of waste cooking oil, and the process was carried out with certain range of operation time. Stirring speed and temperature of adsorption process were maintained constant at 500 rpm and 27oC. The result showed free fatty acid adsorption or reduction in acid number efficiencies increase with higher adsorbent doses. Based on the result, the reduction in acid number of waste cooking oil using activated coconut shell carbon followed the Freundlich-type isotherms.
EKSTRAK DAUN SIRSAK (Annona muricata L.) SEBAGAI ANTIOKSIDAN PADA PENURUNAN KADAR ASAM URAT TIKUS WISTAR Ni Putu Rahayu Artini; Sri Wahjuni; Wahyu Dwijani Sulihingtyas
Jurnal Kimia (Journal of Chemistry) Vol. 6, No. 2 Juli 2012
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

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Abstract

Isolation and identification of anti-oxidant  active isolate from soursop leave (Annona muricata L.) was carried out in this study. Methanol was used to macerate an 158 gram sample. This crude extract showed 77,22% of inhibition ability to reduce oxidation of DPPH (difenil-picrylhydrazine) at the fifth minute and 85,42% at the sixtieth minute inhibition time. Petroleum benzene, chloroform, n-buthanol, and water were applied to separate it. N-buthanol extract has the highest anti-oxidant reduction percentage which was 91,10% of inhibition ability to reduce oxidation at the fifth minute and 97,90% at the sixtieth minute inhibition time. From this research, it was obtained that the best dose of n-buthanol fraction applied to decrease uric acid was 200 mg/Kg BW with a percentage decrease of 86,29% (p=0,001).n-buthanol  fraction was identified by gas chromatography-mass spectrometer. The active compounds observed were: benzofuran,2,3-dihidro; tetradecana;  3-ethoxy-1,4,4a,5,6,7,8,8a-octahydroisoquinoline;  2-cyclohexen-1-one, 4-hydroxy-3,5,6-trimethyl-4-(3-oxo-1-butenyl). In conclusion, soursop leave (Annona muricata L.) extract  was active for decreasing uric acid of rat tested. For future research, this method could be applied to human in decreasing uric acid concentration in blood.

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