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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 518 Documents
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BIOSORPSI Cr(III) PADA BIOSORBEN SERAT SABUT KELAPA TERAKTIVASI SODIUM HIDROKSIDA (NaOH) I Wayan Sudiarta; Emmy Sahara
Jurnal Kimia (Journal of Chemistry) Vol. 5, No. 2 Juli 2011
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 (210.779 KB)

Abstract

Studies on biosorption of chromium (III) on NaOH-activated biosorbent of coconut coir fibre have been carried out. These studies included the determination of optimum concentration of NaOH for activating the biosorbent, the determination of biosorbent acidity, the optimum pH, the contact time of biosorption, and the adsorption isotherm type.The result showed that the NaOH optimum concentration for activation of coconut fiber was 1,2 M. The surface acidity of BBN and B00 were of 9,99 ± 0,17 and 3,17 ± 0,21 mmol/g respectively. The surface specific of BBN and B00 were of 20,21 and 19,14 m2/g respectively. The optimum pH of biosorption Cr(III) on BBN and B00 biosorbent was 3 and the contact time were 30, and 120 minutes. The type of isotherm adsorption for the biosorption of Cr(III) on BBN and B00 biosorbent was isotherm S.
KAJIAN PENGARUH VARIASI KONSENTRASI ASAM SITRAT TERHADAP KEKUATAN GEL PRODUK GELATIN KULIT AYAM BROILER DIKAITKAN DENGAN POLA PROTEINNYA Tutut Hardikawati; Ni Made Puspawati; Ketut Ratnayani
Jurnal Kimia (Journal of Chemistry) Vol. 10, No. 1 Januari 2016
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 (141.129 KB) | DOI: 10.24843/JCHEM.2016.v10.i01.p16

Abstract

Gelatin is a biopolymer that can be generated from partially hydrolysis of collagen tissue. Extraction of gelatin consists of pretreatment and thermal extraction steps. Pretreatment process used sodium hydroxide to remove non collagen protein in matrix sample, sulfuric acid to demineralize, and citric acid to hydrolyse. The aim of this research was to study the effect of variation in concentrations of citric acid used in hydrolysis process on the gel strength and protein profile of gelatin products extracted from broiler chicken skin.  The variation of the concentration citric acid used was 0.7 % (GA); 1.5% (GB); and 3.0% b/v (GC) respectively. The gel strength was measured using CT3 Texture Analyzer and protein profile of gelatin product was analyzed by SDS-PAGE method. The result showed that variation in concentration of citric acid used in the pretreatment process affected the gel strength and protein profile of gelatin product. Increasing the concentration of citric acid used in pretreatment process decreased the gel strength and molecular weight of gelatin product. Gel strength of each gelatin product was 265.81 g bloom for GA ; 196.05 g bloom for GB (1.5%), and 35.32 g bloom for GC (3.0 %) respectively. The electropherogram of both GA (0.7%) and GB (1.5%) revealed similar pattern of protein bands but the thickness of each bands was different.  On the other hands, GC (3.0%) did not show any protein bands on the eletropherogram. The best gelatin product obtained in this experiment was found by using 0.7 % b/v citric acid (GA) in the pretreatment process. The gelatin product (GA) had characteristics as follows: yield 15.73%; moisture 7.30%; ash 0.51%; protein content 97.95%; fat content 0.62%; gel strength 265. 81 g bloom and thicker protein bands than others.  
METABOLIT SEKUNDER DARI BATANG PHYSALIS PERUVIANA (SOLANACEAE) L. Rosmainar
Jurnal Kimia (Journal of Chemistry) Vol.12 No.2 Juli 2018
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 (421.078 KB) | DOI: 10.24843/JCHEM.2018.v12.i02.p10

Abstract

Penelitian ini dilakukan terhadap tanaman Physalis peruviana yang telah banyak dimanfaatkan dalam pengobatan tradisional. Tujuan penelitian ini adalah untuk mengisolasi senyawa metabolit sekunder dari batang tanaman Physalis peruviana dan menentukan strukturnya. Senyawa-senyawa yang banyak ditemukan dalam genus Physalis adalah steroid, seperti yang terdapat dalam P. angulata, P. philadelpica, P. alkekengi, dan P. virginiana. Metode yang digunakan adalah dengan maserasi menggunakan metanol kemudian diekstraksi dengan menggunakan n-heksan dan etil asetat, dan selanjutnya dilakukan pemisahan senyawa dengan menggunakan teknik kromatografi. Hasil penelitian menunjukkan bahwa senyawa yang didapat memiliki titik leleh 1950 – 1960C dengan massa 0,20 gram yang berbentuk serbuk berwarna putih. Penentuan struktur dilakukan dengan FTIR (3269 cm-1, 2924 cm-1, 1678 cm-1), MS (m/z 485,2552), NMR 1D (1H-NMR & 13C-NMR), NMR 2D (HMBC, HMQC, COSY) serta membandingkan hasil spektra dengan senyawa yang telah diperoleh sebelumnya. Senyawa yang diperoleh merupakan golongan senyawa Witasteroid dan struktur yang disarankan adalah 4?-Hidroksiwithanolida E. Kata kunci: 4?-hidroksiwithanolide E, P. peruviana, Solanaceae, steroid, witasteroid.
SCREENING FITOKIMIA DAN AKTIVITAS ANTIRADIKAL BEBAS EKSTRAK METANOL DAUN GAHARU (Gyrinops versteegii) I Made Mega; Dewa Ayu Swastini
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 (111.078 KB)

Abstract

It has been done screening fitokimia and the determination of free antiradical activity extract methanol ofgaharu leaf. The screening fitokimia determined by the colour test and free antiradical activity determined bydiphenyl pykril hydrazil (DPPH) method according to sphectrophotometry UV-Vis, before that the honey was dilutedwith methanol and then the absorbance was measured on 497nm, 517 nm, and 537 nm. The result showed thatmethanol extract of gaharu leaf contain phenol, flavonoid and terpenoid compound and the free antiradical activityshowed inhibitor percent is 106,32 % (5”) and 111,31 % (60’).
BILANGAN PEROKSIDA, BILANGAN ASAM, DAN KADAR FFA BIODIESEL DENGAN PENAMBAHAN ANTIOKSIDAN DARI KULIT BUAH PISANG KEPOK (Musa paradisiaca Linn.) Ni Made Sukma Sanjiwani; Ni Made Suaniti; Ni Luh Rustini
Jurnal Kimia (Journal of Chemistry) Vol. 9, No. 2 Juli 2015
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 (139.064 KB) | DOI: 10.24843/JCHEM.2015.v09.i02.p17

Abstract

The peel of banana kepok fruit (Musa paradisiaca Linn.) contains compound that function as an antioxidant in biodiesel. The purposes of this study were to determine the peroxide number, acid number, and FFA content of biodiesel from waste palm oil with addition of chloroform extract (EKKBPK). Biodiesel was synthesized using esterification reaction of wasted palm oil with methanol (10:1) and by transesterification reaction (4:1), the extract of peel of banana kepok fruit was theen added with various concentration of 0,1 % w/v (A1); 0,2 % w/v (A2); and 0,3 % w/v (A3) to the reaction mixtures. The peroxide number, acid number, and FFA content of synthesized biodiesel obtained in this research were 9.3591 meq peroxide/1000 g; 0.7221 mg KOH/g; and 0.33% repectively; biodiesel without addition of EKKBPK (12.2746 meq peroxide/1000 g; 0.6492 mg KOH/g; and 0.30%); and biodiesel with addition of EKKBPK 0.1 % w/v (11,1878 meq peroxide/1000 g; 0,4814 mg KOH/g; and 0.22%); 0.2 % w/v (9.7508 meq peroxide/1000 g; 0.3501 mg KOH/g; and 0.16%); and 0.3 % w/v (12.2512 meq peroxide/1000 g; 0.5217 mg KOH/g; and 0.24%). The acid numbers of those biodiesel were in acordance to the acid number of SNI 04-7182-2006. The addition of 0.2 % w/v EKKBPK on biodiesel showed the lowest peroxide number, acid number, and FFA content threfore it was the most effective in inhibiting the oxidation reaction of biodiesel.
NILAI DAYA HANTAR LISTRIK, KADAR ABU, NATRIUM, DAN KALIUM PADA MADU BERMERK DI PASARAN DIBANDINGKAN DENGAN MADU ALAMI (LOKAL) Putu Setya Sri Antary; Ketut Ratnayani; A. A. I. A. Mayun Laksmiwati
Jurnal Kimia (Journal of Chemistry) Vol. 7, No. 2 Juli 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 (279.403 KB) | DOI: 10.24843/JCHEM.2013.v07.i02.p08

Abstract

Honey sweet substance naturally produced by bees. Good honey must meet the requiremends setby the Indonesian National Standard (SNI). The aim of this research was to determine thequality of some branded honey samples sold in some markets around Denpasar and natural honey (local) collected from beekeepersby examining their electrical conductivities, ash contents, and ratio of potassium to sodium. The electrical conductivities were determinedby applying the standard procedures established by IHC (International Honey Commission), ash contents were quartified by following the procedures of standard SNI01-3545-2004, while the determination of potassium and sodium contents were carried out by the use of Atomic Absorption Spectrophotometry. The results showed that the electrical conductivities and ash contentsin all honey samples studiedmet the maximum limits of standard values which were of 0.8 mS.cm-1 and 0.50 %, respectively. The results also demonstrated that the value of electrical conductivities were proportional to the ash contents. The ratio of sodium to potassium of a good quality honeyis approximately 4 : 1. In this research, it was found that the ratio of Na : K for samples A (natural honey), B, C, and D, were of (3 : 1), (2: 1), (4 : 1), and (4 : 1), respectively, while for sample E was of 8 : 1. It was concluded that A, B, C, and D samples meet the criteria of good quality honey, while sample E (not branded honey) didnot meet the criteria.
PENENTUAN KANDUNGAN TOTAL FLAVONOID DAN TOTAL FENOL DARI AKAR KERSEN (Mutingia calabura) SERTA AKTIVITASNYA SEBAGAI ANTIOKSIDAN M. R. M. Senet; I G. M. A. P. Raharja; I K. T. Darma; K. T. Prastakarini; N. M. A. Dewi; I M. Oka Adi Parwata
Jurnal Kimia (Journal of Chemistry) Vol. 12 No.1 Januari 2018
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 (252.661 KB) | DOI: 10.24843/JCHEM.2018.v12.i01.p03

Abstract

Penelitian ini bertujuan untuk mengetahui kadar fenol dan flavonoid total dari ekstrak akar kersen serta aktivitas antioksidannya. Hasil ekstraksi 1 kg akar kersen menghasilkan ekstrak etanol (30,56 g), kloroform (6,52 g), etilasetat (6,1 g), n-butanol (3,21 g) dan air (4,65 g). Penapisan fitokimia menunjukkan ekstrak yang positif flavonoid adalah ekstrak air, kloroform, etanol dan etil asetatsedangkankelimaekstrak tersebut positif mengandung polifenol. Ekstrak etanol, n-butanol, kloroform, etil asetat, dan air memiliki kandungan total fenol berturut-turut yaitu 12,62%, 3,81%, 6,12%, 8,75%, dan 11,93%. Kandungan flavonoid pada ekstrak etanol, kloroform, etil asetat, dan air berturut-turut yaitu 0,22%, 0,05%, 0,12%, dan 0,03%. Aktivitas antioksidan pada ekstrak etanol diukur dengan metode DPPH dan dinyatakan dengan nilai IC50 sebesar 36,44 ppm
DAMMARANE-TYPE TRITERPENOIDS FROM THE STEMBARK OF CHISOCHETON PENTANDRUS (MELIACEAE) D. G. Katja; S. Salam; . Nurlelasari; D. Harneti; R. Maharani; U. Supratman; Y. Shiono
Jurnal Kimia (Journal of Chemistry) Vol.14 No.1 Januari 2020
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 (104.499 KB) | DOI: 10.24843/JCHEM.2020.v14.i01.p15

Abstract

Two dammarane-type triterpenoids, cabraleadiol (1) and cabraleahydroxylactone (2), have been isolated from n-hexane extract of the stembark of Chisocheton pentandrus (Meliaceae). The structure of compounds 1 and 2 were determined by spectroscopic data mainly NMR and mass as well as by comparing with previously reported spectral data. Compounds 1 and 2 were reported for the first time from Chisocheton pentandrus. Keywords: Cabraleadiol, Cabraleahydroxylactone, Chisocheton pentandrus, Meliaceae.
STUDI PERBANDINGAN HASIL SINTESIS METIL-N(2,3-XILIL)ANTRANILAT DENGAN PEREAKSI DIAZOMETANA DAN BF3-METANOL I W. G. Gunawan
Jurnal Kimia (Journal of Chemistry) Vol. 3, No. 1 Januari 2009
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 (80.135 KB)

Abstract

N(2,3-xylyl)antranilic acid is an analgesic drug which works by inhibiting synthesis of prostaglandin.Through this mechanism N- (2,3-xylyl)antranilic acid causes gastro iritation. Therefore, this research aims tosynthesise N- (2,3-xylyl)antranilic ester derivatives using BF3-methanol and diazomethane methods, and to findwhich methods will give the best result.Diazomethane used for methylation reaction needs to be fresh because it is an unstable gas, while BF3-methanol needs refluxing for 10-15 hours. The physico chemical properties of methylation product werecharacterised using colour reaction testing, melting point, and Rf value, while the structure was identified using UVvis,FT-IR and 1HNMR.It was found that diazomethane method gave better yield (68%) compared to BF3-methanol (52%). N- (2,3-xylyl)antranilic methyl ester obtained using both methods was found as a yellowish-white shiny crystal having thesame degree of purity. In addition, both product revealed the same physico chemical properties such as meltingpoint, colour, and Rf value. Hence, the products obatined using both methods were identical which was N- (2,3-xylyl)antranilic methyl ester.
AKTIVITAS ANTIOKSIDAN SENYAWA GOLONGAN FLAVONOID EKSTRAK ETANOL DAGING BUAH TERONG BELANDA (Solanum betaceum Cav.) Ida Ayu Raka Astiti Asih; I Wayan Sudiarta; Ade Ayu Wulan Suci
Jurnal Kimia (Journal of Chemistry) Vol. 9, no. 1 Januari 2015
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 (83.791 KB) | DOI: 10.24843/JCHEM.2015.v09.i01.p06

Abstract

Terong belanda (Solanum betaceum Cav.) is a good nutrient for health because of its potential as anti-oxidant. Anti-oxidants work by giving one of its electrons to the compounds that are oxidants so that its activity can be inhibited. Extraction was done by maceration and partition, separation and purification with chromatography analysis, identification of active compound using UV-Vis and FTIR spectrophotometer and testing of anti-oxidant activity with diphenylpicrylhydrazyl (DPPH) method. Extraction of 3,950 grams of fresh terong belanda flesh using 5L 70% ethanol produced 178,44 grams ethanol extract. Partition of 100 g ethanol extract gained three concentrated extracts in n-hexane (0.45 g), chloroform (0.37 g) and n-buthanol (3.39 g). The phytochemical test showed that n-buthanol extract contained flavonoids compounds. The result of anti-oxidant activity was showed that ethanol extract and n-buthanol extract had IC50 of  1,302.08 ppm and 606.06 ppm. Column chromatography analysis on n-buthanol extract with mobile phase n-buthanol:ethyl acetate:10% acetic acid (2:7:1) resulted in 7 fractions (F1, F2, F3, F4, F5, F6, F7) and phytochemical test showed that fraction F2 belonged to flavonoids compound. Infrared analysis identified that isolate had –OH, C=O, C-O, C=C aromatic, CH aromatic, and CH aliphatic. Isolate analysis using UV-Visible gained 2 peaks at ? 322 nm (band I) and ? 285 nm (band II) which indicated that the flavonoids groups was flavanone or dihydroflavonol. By using “shifting” reagent the isolate was suggested to contain flavanone group with hyrdoxy groups at C-2’, C-5’, C-6’ and O-glycoside group at C-7 atom.

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