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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 9 Documents
 1 
Search results for , issue "Vol. 3, No. 2 Juli 2009" : 9 Documents clear
ANALISIS BAHAN PENGAWET BENZOAT PADA SAOS TOMAT YANG BEREDAR DI WILAYAH KOTA DENPASAR I M. Siaka
Jurnal Kimia (Journal of Chemistry) Vol. 3, No. 2 Juli 2009
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 reports the determination of benzoate, as preservative, in tomato sauces distributed in Denpasar.The analysis was performed by the technique of acid-base titration following solvent extraction of the benzoate withdiethylether. Qualitatively, it was found that the sauce samples both branded and unbranded ones contained benzoate.Quantitatively, it was obtained that the benzoate content in the tomato sauces varied in a range of 600.12 – 1271.86mg/kg. Generally, all branded tomato sauces contained benzoate less than that of maximum limit allowed by theregulation of Health Ministry of RI No. 722/MENKES/Per/IX/1988 (1000 mg/kg). On the other hands, about 33% ofthe unbranded sauce samples contained benzoate more than the maximum limit allowed by the regulation.
ISOLASI DAN IDENTIFIKASI GOLONGAN SENYAWA TOKSIK DARI DAGING BUAH PARE (Momordica charantia L.) I G. A. Gede Bawa
Jurnal Kimia (Journal of Chemistry) Vol. 3, No. 2 Juli 2009
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 toxic compounds were conducted to snake fruit (Momordica charantia L.).Maseration of 600 grams dried fruit in methanol resulted in 54.250 grams dark green extract which were toxic tobrine shrimp (Artemia salina Leach) with an LC50 = 74.99 ppm. When the extract was dissolved in water andpartitioned using n-hexane and chloroform three extracts were obtained. The n-hexane extract was found to be themost toxic to brine shrimp (LC50 = 130.439 ppm).Separation of the n-hexane extract using column chromatography resulted in 7 fractions. The most toxicfraction (F), LC50 = 33.83 ppm, was pure based on TLC.FTIR analyses showed that the active components of the extract contains triterpenoides characterized by CHaliphatic groups (CH2, CH3), binded O-H, C-O, C=C, and C=O. UV-Vis spectra showed absorption at 274,2 and432,8 nm suggesting an n * electronic transition.
PROSES DEKANTASI MINYAK ATSIRI DENGAN VARIASI PLAT INTERCEPTOR DALAM DEKANTER I M. Rajendra; I. A. Anom Arsani
Jurnal Kimia (Journal of Chemistry) Vol. 3, No. 2 Juli 2009
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

Decantation process was done to separate oil and water. Mostly, Small Medium Enterprises (SME) use lowtraditional technology as multiple drums. As a result, there is much oil dumped together with wastewater. A betterway to decant oil and water can be done by using an interceptor plate in decanter equipment. This research aims wasto test the performance of decanter with special design by using an interceptor plate. The observation focused ondistance between plates toward the oil content in wastewater, which was measured by its density. Three variables ofplate distance were 10 mm, 20 mm, and 30 mm. Material tests were nilam and clove oil with several concentrationsi.e. 1.96%, 3.85% and 5.66%, and the flow rate was adjusted at 2 liters/minute. The result shown that the interceptorplate with 10mm distance produced wastewater with lower content of oil. In addition, in industry scale test, thedecanter having 10mm distance plate interceptor could reduce oil loss up to 11.8% for nilam and 42.9% for clovecompared to that of multiple drum.
SENYAWA ANTIBAKTERI GOLONGAN FLAVONOID DARI BUAH BELIMBING MANIS (Averrhoa carambola Linn.L) I M. Sukadana
Jurnal Kimia (Journal of Chemistry) Vol. 3, No. 2 Juli 2009
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 active antibacterial compounds from star fruit (Averrhoa carambola Linn). hasbeen carried out. As much as 140.56 g of concentrated methanol extract was resulted from 10 kg star fruit that wasmacerated using methanol. This extract was dissolved into methanol-water (7:3) and then partitioned with n-hexaneand chloroform respectively, resulting in concentrated extracts of 0.10 g of n-hexane, 0.07 g of chloroform, and48.01 g of water. The result of phytochemical test for flavonoid for all of the extracts suggested that water extractsshowed most be test intense to the flavonoid.Separation of water extract using column chromatography resulted in FB fractions that was orange as muchas 0.2027 g and contains flavonoid. Infra red and UV-vis spectroscopy were employed in order to identify the FBfraction. The result of identification showed that isolate (fraction FB) was cathechin compounds which containedhydroxyl groups at C-3, C-7 and C-4’. It also had functional groups like –OH, C-H aromatic, C-H aliphatic, C=Caromatic, C-O alcohol, and it did not contained C=O carbonyl group. The isolate inhibited E.coli growth at 100 ppmand S. aureus grouth at 500 ppm.
DISTRIBUSI Pb DAN Cu PADA BERBAGAI UKURAN PARTIKEL SEDIMEN DI PELABUHAN BENOA E. Sahara
Jurnal Kimia (Journal of Chemistry) Vol. 3, No. 2 Juli 2009
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 distribution of Pb and Cu in various particle sizes of sediment collected fromBenoa Bay, Bali. The particle sizes of sediment observed were >300; 300 – 100; 100 – 88,88 – 63 and <63 mm. Priorto the determination of both heavy metals, the sediments were digested with the mixture of HNO3 and H2O2 (1:1) at120oC. The measurements of the metal concentrations were performed by the use of Atomic AbsorptionSpectroscopy technique with the application of calibration method.It was found that the smaller the particle sizes the higher the metals concentraions were. The sediment of>300 mm contained Pb and Cu 0,74 – 0,77 mg/kg and 0,15 – 9,24 mg/kg, respectively. On the other hand, thesediment of < 63mm contained 21,36 – 53,01 mg/kg Pb and 104,14 – 132,82 mg/kg Cu. It was also observed thatthe distribution of particle sizes of all sediment collected from four sampling locations had similar patern.
PENELUSURAN SENYAWA SITOTOKSIK PADA KULIT BIJI NYAMPLUNG (Calophyllum inophyllum L.) DAN KEMUNGKINAN KORELASINYA SEBAGAI ANTIKANKER Sri Rahayu Santi
Jurnal Kimia (Journal of Chemistry) Vol. 3, No. 2 Juli 2009
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 active toxic compounds from nyamplung skin bean (Calophyllum inophyllumL). has been carried out. As much as 12,43 g of concentrated methanol extract was resulted from 1.0 kg dry powdernyamplung skin bean that was macerated using methanol. This extract was dissolved into methanol-water (7:3) andthen partitioned with n-hexane and chloroform respectively. The result of toxicity test to both extract showed thatchloroform extract was the most active toxic with LC50 = 239,88 ppmSeparation of chloroform extract using preparative thin layer chromatography (TLC) resulted in F5 fractionsthat was white yellowish as much as 52 mg and LC50 = 151,36 ppm. Infra red and UV-vis spectroscopy wereemployed in order to identify the F5 fraction. The result of identification showed that isolate was aldehidetriterpenoide compounds which had functional group like –OH (3429 cm-1), -CH aldehyde (2922,9 and 2852,9 cm-1),-CºC- (2360 cm-1), -C=O (1742,7 cm-1), -C=C- alkene(1637,0 cm-1), -CH3, -CH2 (1542,9, 1480,7, 1401,9 cm-1), -CO-(1090 cm-1), It showed absorbed at broad peaks at l(nm) (CHCl3): 254, 282, and 342,7.
KADAR AIR DAN BILANGAN ASAM DARI MINYAK KELAPA YANG DIBUAT DENGAN CARA TRADISIONAL DAN FERMENTASI N. G. A. M. Dwi Adhi Suastuti
Jurnal Kimia (Journal of Chemistry) Vol. 3, No. 2 Juli 2009
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 water contents and acid numbers of coconut oils made by thad way and by fermentation werecompared. The water contents were determined using oven method while the acid numbers was cletermined bytitration. Both parameters were compared on oils exposed to open air for 0, 1, 2, 3, and 4 weeks.Result showed that water contents and acid value of coconut oils produced by fermentation process werehigher than coconut oils made by traditional ways. Water content of coconut oil made by traditional way and byfermentation were elevated during exposure. The highest water content of both coconut oils made by traditional wayand fermentation process after 4 weeks exposure were 0,03 % and 0,06 % respectively, while the highest acidnumbers of both coconut oils products after 4 weeks exposure were 0,75 and 0,89 mg KOH/g respectively
BIOSORPSI ION Cr(III) PADA RUMPUT LAUT Eucheuma Spinosum TERAKTIVASI ASAM SULFAT I W. Sudiarta
Jurnal Kimia (Journal of Chemistry) Vol. 3, No. 2 Juli 2009
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

Biosorption of chromium(III) ion on sulfuric acid activated algae (Eucheuma spinosum) biosorbent havebeen studied in this research. The studies included determination of optimum ratio of sulphuric acid to biosorbentalgae, biosorbent acidity, isoterm and biosorption capacity, and interaction mechanisms of Cr(III) on biosorbent. Themechanisms interaction of Cr(III) on biosorbent can be determinted from the sequential desorption of Cr(III) usingH2O, 1M HCl and 0.05M Na2EDTA.The result showed that the optimum ratio of sulphuric acid to biosorbent was 1.5 mmol/g. It was also foundthat the total acidity of acid-activated and untreated algae biosorbent were 8.56±0.21 and 2.59± 0.28 mmol/grespectively. The biosorption capacity of activated biosorbent toward Cr(III) was 72.33 mg/g while the capacity ofuntreated biosorbent was 57.32 mg/g. The interaction mechanisms of Cr(III) with biosorbent were found to bemainly through the ionic interaction, while the interaction through hydrogen bonding, van der Walls, andcomplexation were found to be relative us low.
IDENTIFIKASI SENYAWA ANTIBAKTERI PADA DAUN KECAPI (Sandoricum koetjape (Burm.f.) I M. Dira Swantara; Yenni Ciawi
Jurnal Kimia (Journal of Chemistry) Vol. 3, No. 2 Juli 2009
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

Identification of antibacterial compound for Micrococcus luteus dan Eschericia coli bacteri have beenconducted to kecapi leaf extract (Sandoricum koetjape (Burm.f.)). Extraction of that compounds was carried out bymaseration methods using 70% etanol. Separation of the fraction by liquid-liquid partition (n-hexane, ethyl acetateand chloroform) and two step column chromatographic method using silicagel as stationary phase and ethyl acetate –chloroform (3:7;2,5:7,5; dan 2:8) as first eluent and ethyl acetate – chloroform (2:8; 1,5:8,5; dan 1:9) as secondeluent. The active fraction (2.1 and 2.3 fraction) were identified by gas chromatography-mass spectroscopy (GCMS).The 2.1 fraction contain 3 compound which are heksil n-valerate (C11H22O2); 2,3-dihidrobenzofurane (C8H8O);and 2,6-dimetoxy fenol (C8H10O3). The 2.3 fraction contain 2 compound which are ester dioctilehexadioat(C22H42O4) with M+ = 370 and basic peak equal to 129 and 3,5-di-tert-buthyl-4-hydroxy-toluene (C15H24O).

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