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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. 6, No. 1 Januari 2012" : 13 Documents clear
SINTESIS POLIEUGENOL DARI EUGENOL DENGAN KATALIS ASAM NITRAT PEKAT DAN MEDIA NATRIUM KLORIDA I Wayan Suirta; Ni Luh Rustini; Taka Iqbal Prakasa
Jurnal Kimia (Journal of Chemistry) Vol. 6, No. 1 Januari 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

Polyeugenol has been synthesized from eugenol by using nitric acid as a catalyst and sodium chloride medium. Eugenol was obtained from clove oil which was previously redestill. The synthesis was carried but by using nitric acid catalyst on sodium chloride medium and without sodium chloride. The ratio of nitric acid to eugenol as 4 : 1. Polymerization result was analyzed by using infrared spectroscopy. Its rendement and its characteristics were also.The yield with sodium chloride medium was 42,97 %, a reddish black gel with melting point of 114,6-150oC. The yield without sodium chloride medium was 47,77 %, a solid brick red with melting point of 87-89oC. The infrared spectroscopy result showed that on the polymerization with medium was unsuccessful because the still CH=CH2 group absorption at 995.27 cm-1 and C=C at 1635,89 cm-1 were still existed, whereas for the polymerization without medium, both absorptions were absent.
ISOLASI GELATIN DARI KULIT KAKI AYAM BROILER DAN KARAKTERISASI GUGUS FUNGSINYA DENGAN SPEKTROFOTOMETRI FTIR N. M. Puspawati; I N. Simpen; I N. Sumerta Miwada
Jurnal Kimia (Journal of Chemistry) Vol. 6, No. 1 Januari 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

Gelatin is a biopolymer that can be obtained from partially hydrolysis of collagen present in skin, bone, and connective tissues of animals. The aim of the present work is to isolate and characterize gelatin obtained from chicken feet Broiler’s skin after curing with acid and base. Isolation of gelatin from skin of chicken feet Broiler was performed by water-bath extraction through type A (acid) and type B (base) processes. CH3COOH 1.5% (GA) was used for acid-curing, and NaOH 2.0% (GB) for base-curing processes with 2 days soaking time. Gelatin prepared from acid-curing (GA) gave yield 8.47%, protein content 82.59%, and 23.50%. While gelatin from alkali process (GB) gave yield 7.37%, protein content 79.75% %, and fat content 15.76%. FTIR spectra of GA and GB were very similar. Both GA and GB exhibited peaks at wavelength number for region of amide A, amide I, II, and III which a characteristic for gelatin functional groups. GB exhibited peaks at 1242 cm-1 with low intensity in the amide III region while GA did not. This result is associated with the loss of triple helix or denaturation of collagen to gelatin. Based on FTIR results it can be concluded that GA and GB obtained were true gelatins, although GA gave a better result.
STUDI KINETIKA ADSORPSI LARUTAN ION LOGAM KROMIUM (Cr) MENGGUNAKAN ARANG BATANG PISANG (Musa paradisiaca) Ida Ayu Gede Widihati; Ni G. A. M. Dwi Adhi Suastuti; M. A. Yohanita Nirmalasari
Jurnal Kimia (Journal of Chemistry) Vol. 6, No. 1 Januari 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

Adsorption kinetics of chromium (Cr) ion on char from banana stem has been studied. The char used in this research as obtained by pyrolisys at 4000C for 0,5 hours. The parameters studied included the surface area, which was determined by spectrophotometer UV-VIS using methylen blue method, equilibrium time, the adsorption isotherm, the adsorption capacity, the influence of pH on adsorption capacity, and the adsorption kinetics.The result showed that the surface area was 3,4559 m2/g. The adsorption capacity of banana stem (Musa paradisiaca) char on Cr6+ metal was 0,8019 mg/g, obtained at 40 minutes equilibrium time with initial concentration of Cr6+ metal (adsorption isotherm) of 75 ppm. At pH 4,00, it was obtained that the maximum adsorption capacity of the adsorbent on Cr6+ metal was 0,9088 mg/g. The adsorption followed a second-order kinetics with a rate constant of 0,0008 minute-1ppm-1
KADAR THIAMIN HIDROKLORIDA (VITAMIN B1) PADA NASI BERAS PUTIH DAN BERAS MERAH PADA BERBAGAI WAKTU PENYIMPANAN PADA ALAT MAGIC-COM A. A. I. A. Mayun Laksmiwati; Ketut Ratnayani; Ni Wayan Agustini
Jurnal Kimia (Journal of Chemistry) Vol. 6, No. 1 Januari 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 influence of storage time on the thiamine hydrochloride content in rice. White rice (C36) and red rice were stored in a magic-com for a period of time, of 0 hours, 6 hours and 12 hours. Thiamine hydrochloride contents in rice were separated with the use of a chromatography column with alumina oxide, while and the measurement was carried out by UV-Vis spectrophotometry.It was found that the thiamine hydrochloride content in red rice stored within 0 hours, 6 hours and 12 hours were, 5.3 mg/kg, 4.5 mg/kg and 2.8 mg/kg, respectively, while in white rice they were found to be 2.6 mg/kg, 2.0 mg/kg and 1.4 mg/kg, respectively.
AKTIVITAS BAKTERISIDA EKSTRAK CEM-CEM (Spondias pinnata (l .f) Kurz) TERHADAP BAKTERI Erwinia chrysanthemi PENYEBAB PENYAKIT BUSUK LUNAK LIDAH BUAYA Ni Komang Ariati
Jurnal Kimia (Journal of Chemistry) Vol. 6, No. 1 Januari 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

A compound with antibacterial activity has been isolated from cem-cem (spondias pinnata (L.f) kurz). Antibacterial activity test towards Erwinia chrysanthemy resulted in VIII fraction. Fraction V effectively inhibited the growth of Erwinia chrysanthemy. The analysis of the active fraction with GC-MS (Gas Chromatography-Mas Spectrophotometer) showed that the active fraction contains Methyl Ester.
DIFUSI NATRIUM DIKLOFENAK DALAM GEL METHOCEL 400 PADA BERBAGAI pH Ketut Widyani Astuti; Yeyet C. Sumirtapura; Ni Nyoman Wiwik S.
Jurnal Kimia (Journal of Chemistry) Vol. 6, No. 1 Januari 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

Diffusion of sodium diclofenac in Methocel 400 gel at various pH has been studied. Diffusion test was performed in diffusion cells with artificial membranes of Whatman no.1 filter paper which was immersed in Spangler solution. Measurement of active ingredient concentration that diffuses was performed using UV spectrophotometer at a wavelength of 277 nm.The results showed that highest diffusion of diclofenac sodium occured at pH 7 with a mean percentage of diclofenac sodium diffuses after 240 minutes of 56,88 + 13,70%. The mean percentage of diclofenac sodium which diffuses from the gel Methocel 400 at pH 6 after 240 minutes was 30,39 + 1,08% while that from the Methocel 400 gel at pH 8 was 46,84 + 6,24%.
SKRINING AWAL ANTITUMOR MELALUI PENDEKATAN UJI TOKSISITAS KANDUNGAN SENYAWA DALAM EKSTRAK n-HEKSANA RIMPANG TEMU PUTIH (Curcuma zedoaria (Berg.) Roscoe) Wiwik Susanah Rita; I G. A. Gede Bawa; Ni Luh Putu Lilis Wirastiningsih
Jurnal Kimia (Journal of Chemistry) Vol. 6, No. 1 Januari 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 cytotoxic compounds from n-hexane extract of white turmeric rhizomes (Curcuma zedoaria (Berg.) Roscoe) has been performed. Extraction was done by maceration technique. Saponification reaction was applied to separate the fat with another lipid, separation and purification was then performed by chromatographic techniques. Toxicity tests performed by the method of Brine Shrimp Lethality Test (BSLT) using Artemia salina L. larvae, while the analysis of the most toxic isolates were performed by Gas Chromatography-Mass Spectroscopy (GC-MS).Extraction of 1700 g of dried white turmeric rhizome powder produced 39.68 g of concentrated n-hexane extracts. The results of toxicity tests with n-hexane extract of Artemia salina L. larvae was obtained LC50 values of 79.43 ppm. Saponification of n-hexane extract produced 9.18 g of n-hexane phase and 137.38 g water phase. Toxicity test indicated that n-hexane extract phase was the most toxic with the LC50 of 17.78 ppm. Then the active phase was separated and purified by gradient column chromatography and obtained 11 fractions. Fraction 11 was the the most toxic with the LC50 of 3.8 ppm. The column chromatography obtained two fractions (F11a and F11b), which F11b was the most active with LC50 of 3.5 ppm.The analysis of isolate by Gas Chromatography Mass Spectroscopy showed a mixture of compounds: tetradecane, hexadecane, 3-methylheptadecane, octadecane, 2-methyleicosane, n-docosane, and heneicosane.
KARAKTERISASI ADSORBEN KOMPOSIT ALUMINIUM OKSIDA PADA LEMPUNG TERAKTIVASI ASAM P. Suarya
Jurnal Kimia (Journal of Chemistry) Vol. 6, No. 1 Januari 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

Composite of alluminium oxide in clay has been prepared. The materials were prepared as follow: first, clay was activated with 1.2 M sulphuric acid, then intercalated using polyoxycation of alluminium, and finally calcinated to form composite of alluminium oxide (Al2O3). X-ray diffraction (XRD) was employed to characterize basal spacing (d001). Acid-base titration was used for determining the surface acidity, and spectrophotometer UV-Vis for determining the specific surface area.The results show that activation of clay with sulphuric acid and interchalation with polyoxycation of alluminium increase the surface acidity of aluminium oxide composite in clay the namely. The specific surface area of CC0-0, CCa-0, CCa-1, CCa-2 and Cca-3 were 27.0307 m2/g; 28.2351 m2/g; 29.0040 m2/g; 29.2074 m2/g; and 29.1513 m2/g respectively. The X-ray results indicated that adsorbent was composed by montmorillonite, kaolinite, chlorite, feldspar, and calsite.
IDENTIFIKASI SENYAWA ANTIRADIKAL BEBAS PADA RUMPUT LAUT Sargassum ringgoldianum I M. Dira Swantara; A. A. Bawa Putra; I P. Surya Udayana
Jurnal Kimia (Journal of Chemistry) Vol. 6, No. 1 Januari 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 identification of antiradical compounds from Sargassum ringgoldianum seaweed has been conducted. Its metabolite extraction was carried out by maceration using ethanol and acetit acid mixture with ratio 9:1. It produced 7,02 gram crude extract from 230 grams of sample pollen. This crude extract has free-radical reduction activity of 66,50% at the fifth minute and 78,77% at the sixtieth minute. Separation and purification were carried out by partition, thin layer chromatography, and column chromatography. Partition was accomplished using petroleum ether, chloroform, ethyl acetate, and also water. Petroleum ether ectract had the highest free-radical reduction percentage, of 76,21%, which was obtained on the fifth minute, and 91,16% on the sixtieth minute. The petroleum ether extract was further separated with column chromatography, using stationary phase of silica gel 60 and mobile phase of a mixture of petroleum ether : acetone (7:3) and produced five fractions (FA, FB, FC, FD, dan FE). The most active fraction with antiradical activity was fraction B with percentage of free-radical reduction of 62,77% on the fifth minute and 92,19% on the sixtieth minute. This activity equals 93,06% of the antiradical activity of vitamin E. Fraction B was identified to consist of six compounds : ethyl myristate; dibutyl phthalate; ethyl palmitate; methyl isostearate; dioctyl phthalate; and 3?-bromo cholest-5-ene.
PENGOLAHAN AIR LIMBAH PEMBANGKIT LISTRIK PT INDONESIA POWER DENGAN METODE FLOTASI DAN BIOFILTRASI SARINGAN PASIR TANAMAN I Wayan Budiarsa Suyasa; Iryanti Eka Suprihatin; I Gusti Ayu Kd Ravika Sugianthi
Jurnal Kimia (Journal of Chemistry) Vol. 6, No. 1 Januari 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 on PT Indonesia Power waste water from power plant operations by flotation method and biofiltration has been carried out. This research aim to determine the optimal aeration time on the flotation process, the optimal residence time of the biofiltration to decrease the oil content and COD of waste water samples, and the capacity of the biofilter to decrease oil content and COD.The result of research shows that the optimum timing of aeration in the flotation process is 20 minutes, during which it decreases the oil content by 20.433,33 mg/L (94,60%), whereas the time to reduce the oil content to 450 mg/L is 60 minutes. Optimal residence time of waste water treatment by the sand filters is 6 hours by decreasing the oil contents to 366,67 mg/L (81,48%) and COD to 50,456 mg/L (51,08%). The time needed to reduce the oil content to 0 mg/L is 36 hours and COD to 28,084 mg/L is 48 hours. Oil content and COD of the flotation effluents and sand – biofiltration are below the thres hold of Class III Water Quality Guide lineaccording to PerGub Bali in 2007 (1 mg/L and 50 mg/L respectively). Treatment capacity of sand filter plant to reduce oil content is 8333,33 ppm/m3 hours, while to decrease COD the treatment capacity is 1295,78 ppm/m3 hours.

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