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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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DRAFT GUIDELINE FOR MANUSCRIPT SUBMISSION Ni Made Suaniti
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

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Abstract

DRAFT GUIDELINE FOR MANUSCRIPT SUBMISSION
CEMARAN PESTISIDA FOSFAT-ORGANIK DI AIR DANAU BUYAN BULELENG BALI I. B. Putra Manuaba
Jurnal Kimia (Journal of Chemistry) Vol. 2, No. 1 Januari 2008
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

Pesticide is a chemical used to destroy or to control any pest that damages plant, animal, etc. Therefore,pesticide is very important for protecting plant, animal, and in controlling vector-borne diseases. The use of pesticideis therefore inevitable. A study to investigate the organophosphate pesticide residue in water of Lake Buyan wascarried out.This is an expost facto study with Analytical Cross Sectional Study design. Sample preparation for thispurposed was carried out following a standard method. Gas chromatography was employed in order to gain theorganophosphate pesticide contaminant.Organophosphate pesticide contaminant, i.e. dimethoate, chlorphyrifos and prophenofos were observed on55 water sampling point taken from 5 zone. The residual contaminant of dimethoate; chlorphyriphose; andprophenophose, were 9.3, 3.5, and 2.1 ppb respectively. Total residual contaminant was 14.9 ppb which was bellowthreshold concentration of 100 ppb (SK Gubernur Bali No. 515 Tahun 2000).
SENYAWA ANTIMAKAN PADA MINYAK BIJI NYAMPLUNG (Calophyllum inophyllum L) Sri Rahayu Santi
Jurnal Kimia (Journal of Chemistry) Vol. 8, No. 2 Juli 2014
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 (53.773 KB) | DOI: 10.24843/JCHEM.2014.v08.i02.p13

Abstract

Isolation of antifeedant active compound from sarcocarp of Calophyllum inophyllum L. with  Epilachna sparsa larvae were use as bioindicator was conducted. The antifeedant assay was performed on crude extract, fraction, and isolate.  Dried sarsocarp powder of nyamplung was extraction with 6L metanol to yield 186,38 g dark brown extract.  This Active extract was then fractionated into n-hexane to yield 19,27 g yellow oil.. Separation of 2 g oil was done using silica gel column chromatography with chloroform n-hexane (2:1) as eluent and five group of fraction were obtained with F5 the most active isolat wich showed 27,89% antifeedant activity at 200 ppm was found and relatively pure . Base on analysis of Gas chromatography-mass spectroscopy and data base NISTO2.L the antifeedant active isolat were identify as methyl-14-methyl-pentadecanoid acid, n-hexanedecanoid acid, methyl-9,12-octadecadienoic, methyl-9-octadecenoic acid, methyl-octadecanoic, 9-octadecenoic acid, octadecanoic acid, and the last peak has a moleculer ion at 341.
BIOSORPSI Cr(III) PADA BIOSORBEN SERAT SABUT KELAPA HIJAU TERAMOBILISASI EDTA I Wayan Sudiarta; Wahyu Dwijani Sulihingtyas
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

Studies on biosorption of Cr(III) on coconut fiber immobilized with EDTA biosorbent (B-EDTA) have been conducted. These studies included the optimization of EDTA immobilization on biosorbent, optimization of Cr(III) biosorption on B-EDTA biosorbent that include pH dan contact time biosorption, and also studied the mechanisms of Cr(III) interactions on biosorbent B-EDTA by squential desorption.The result showed that the optimum EDTA immobilization on biosorbent E-EDTA occured at ratio of 1mmol EDTA : 4g biosorbet (0,25mmol/g ), with the surface acidity of biosorbent B-EDTA of 2,18 mmol/g. Optimum biosorption process of Cr(III) on biosorbent B-EDTA occured at pH = 3, contact time of 120 minutes, with the biosorption capacity of Cr(III) on biosorbent B-EDTA of 8,32 mg/g. The squential desorption studies show that the interaction of Cr(III) on biosorbent B-EDTA occured predominantly through physical adsorption namely Van der Waals bonding.
KARAKTERISTIK MUTU GELATIN DARI KULIT AYAM BROILER MELALUI PROSES PERENDAMAN KOMBINASI ASAM-BASA I Nengah Simpen; Ni Made Puspawati; A A I Rahma Prabawanti
Jurnal Kimia (Journal of Chemistry) Vol. 10, No. 2 Juli 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 (164.217 KB) | DOI: 10.24843/JCHEM.2016.v10.i02.p06

Abstract

Kandungan kolagen yang cukup tinggi pada kulit ayam berpotensi untuk dikembangkan sebagai bahan baku alternatif gelatin halal. Penelitian ini bertujuan untuk mempelajari pengaruh variasi pelarut asam, yaitu asam asetat, asam laktat dan asam sitrat dengan konsentrasi masing-masing 1% setelah perendaman basa NaOH 0,15% terhadap rendemen, pH, viskositas, dan kekuatan gel produk gelatin yang diekstrak dari kulit ayam broiler. Proses perendaman yang menghasilkan gelatin terbaik dipilih berdasarkan acuan standar mutu, kemudian gelatin tersebut dikarakterisasi sifat fisikokimianya dan dibandingkan dengan gelatin komersial. Penelitian ini disusun menggunakan rancangan acak lengkap (RAL) enam perlakuan dengan tiga kali ulangan dan dianalisis dengan metode one-way ANOVA. Hasil penelitian menunjukkan perbedaan perlakuan pada proses perendaman tidak berpengaruh nyata (P>0,05) terhadap hasil rendemen, sedangkan terhadap pH, viskositas, dan kekuatan gel berpengaruh nyata (P<0,05). Gelatin terbaik dihasilkan dari proses perendaman dengan NaOH 0,15% dilanjutkan dengan asam asetat 1%. Analisis sifat fisikokimia gelatin terpilih menunjukkan hasil yang tidak berbeda dengan gelatin komersial, serta memenuhi standar mutu SNI dan British Standard dengan karakteristik pH 5,20; viskositas 4,20 cP; kekuatan gel 239,92 g bloom;  kadar air 11%; kadar abu 1,08%; kadar protein 91,82%; dan kadar lemak 0,99%. Hasil analisis spektra FTIR menunjukkan gugus fungsi khas gelatin pada sampel, yaitu gugus O-H, N-H, C-O, C=O, C-N dan NCO.  
STUDI POTENSI SIANIDIN DAN PEONIDIN DARI UBI JALAR UNGU (ipomoea batatas L.) SEBAGAI AGEN DEPIGMENTASI SECARA IN SILICO N. P.L. Laksmiani; I G.P. Putra; I P.W. I P. W. Nugraha; I W. Suwartawan; N. K.S. Ani
Jurnal Kimia (Journal of Chemistry) Vol.13 No.1 Januari 2019
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 (598.749 KB) | DOI: 10.24843/JCHEM.2019.v13.i01.p06

Abstract

Hyperpigmentation is caused by enhancement of melanin production that causes skin darkening. Purple sweet potato is one of the plants that is potentially developed as skin depigmentation agent because it contains anthocyanin. The most common types of anthocyanins in purple sweet potato are cyanidin and peonidin which are in vitro proven to be used as skin lightening. The objective of this study is to determine the potential of cyanidin and peonidin as skin depigmentation agent against target protein D-Dopachrome taumerase through in silico molecular docking method. The research steps include the preparation of target protein using Chimera 1.10.1 program, optimization of cyanidine and peonidin 3D structures using Hyperchem 8 program, validation of molecular docking method, and docking of cyanidine and peonidine on target protein using Autodock 4.2 program. The bond energy between cyanidin and peonidin with the target protein D-Dopachrome taumerase are -7.75 kcal / mol and -8.38 kcal / mol. The cyanidin and peonidin bond values ??are smaller than the native ligand, suggesting that the bond between the test compound (cyanidin and peonidin) with the target protein are stronger and more stable than the native ligand, so that the affinity of the test compound was greater than the native ligand. This suggests that the cyanidin and peonidin compounds in purple sweet potato have potential as a depigmentation agent by inhibiting D-Dopachrome taumerase protein.
AKTIVITAS ANTIBAKTERI SENYAWA FLAVONOID DARI KULIT AKAR AWAR-AWAR (Ficus septica Burm F) I M. Sukadana
Jurnal Kimia (Journal of Chemistry) Vol. 4, No. 1 Januari 2010
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 of flavonoid antibacterial compounds from Awar-awar root skin (Ficus septica Burm.f) has beencarried out. As much as 120.0 g of concentrated methanol extract was resulted from 3.9 kg dry powder of Awar-awarroot skin. About 60.0 g of this extract was dissolved into 2 N hydrochloride acid and then partitioned withchloroform. Extraction of the acid extract using chloroform resulted in 0.82 g of chloroform concentrated extractwhich contained flavonoids. Further, the separation of this extract using column chromatography resulted in 8fractions namely F1, F2, F3, F4, F5, F6, F7 and F8 fraction. The result of flavonoid test of the eight fractions suggestedthat F2, F5, and F6 fractions contained flavonoid compounds. The purification of F2 fraction using n-hexane obtained 2fraction F2.1 and F2.2 (0.13 g and 0.01 g respectively). Infra red and ultra violet-visible spectroscopy were employed inorder to identify the F2.1 fraction. From infra red spectra, it was identified that the isolate had –OH, C=O, C=C andC-H aromatic and C-H aliphatic. The ultra violet-visible spectra showed 2 peaks at 328.6 nm (band I) and 281.5 nm(band II) which indicated flavonoid class compounds flavanon or dihidroflavonol. By using ”shitting” reagent theisolate was suggested to contain flavanon group with hydroxy groups at C-2’, C-5’ or C-6’ and C-8, and methyl orglycosilacy goups at C-5 and C-7 atom. The isolate flavanon showed antibacterial activity toward Vibrio cholera andEschericia coli.
FOTODEGRADASI ZAT WARNA TEKSTIL CONGO RED DENGAN FOTOKATALIS ZnO-ARANG AKTIF DAN SINAR ULTRAVIOLET (UV) I Gusti Ayu Adesia Saraswati; Ni Putu Diantariani; Putu Suarya
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 (89.199 KB) | DOI: 10.24843/JCHEM.2015.v09.i02.p06

Abstract

The research was conducted to study photodegradation of congo red textile dyes by using photocatalyst ZnO-activated carbon and UV light. The parameters observed were optimum quantity of the photocatalyst ZnO-activated carbon, optimum pH, optimum radiation time, reaction rate constant, and the effectivity of photodegradation congo red. Photocatalyst ZnO-activated carbon was synthesized using sol-gel method with the ratio of ZnO : activated carbon 5:1. The results showed that the optimum condition of photodegradation congo red required 50 mg of photocatalyst ZnO-activated carbon, pH 4, and 5 hours exposured to UV light radiation. The photodegradation rate constant of congo red using photocatalyst ZnO-activated carbon was 0.1745 hours-1 and without photocatalyst was 0.0200 hours-1.  The photocatalyst ZnO-activated carbon in its optimum conditions was effective to reduce congo red textile dyes with 91.81 ± 1.24 percentages of degradation.
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.  
HIDROKSIAPATIT TERMODIFIKASI Fe DAN APLIKASINYA UNTUK ADSORPSI ZAT WARNA CONGO RED Ni Komang Tria Paramita Septiari; I Nengah Simpen; Ni G. A. M. Dwi Adhi Suastuti
Jurnal Kimia (Journal of Chemistry) Vol. 11. No.2 Juli 2017
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 (348.951 KB) | DOI: 10.24843/JCHEM.2017.v11.i02.p06

Abstract

Penelitian ini tentang adsorpsi zat warna congo red oleh hidroksiapatit hasil dekomposisi termal 400oC (TA1) dan hidroksiapatit hasil dekomposisi termal 400oC termodifikasi Fe (TA2). Penelitian ini meliputi ekstraksi hidroksiapatit dari tulang secara dekomposisi termal, penentuan jumlah situs aktif hidroksiapatit secara titrasi asam basa, luas permukaan secara metode sorpsi biru metilen, perbandingan unsur Ca/P dianalisis menggunakan laser induced breakdown spectroscopy(LIBS), kristalinitas secara difraksi sinar-X (XRD), penentuan waktu setimbang adsorpsi congo red, isoterm adsorpsi dan kapasitas adsorpsi congo red tanpa dan dengan penambahan H2O2 menggunakan spektrofotometer UV-Vis. Hasil penelitian menunjukkan bahwa jumlah situs aktif hidroksiapatit tertinggi ditunjukkan oleh TA1 yaitu 19,3493x1023 situs/gram dan luas permukaan tertinggi ditunjukkan oleh TA1 yaitu 26,5375 m2/g. Perbandingan unsur Ca/P yang dihasilkan oleh TA1 yaitu 1,6425 sesuai literatur (1,67). TA2 menghasilkan puncak XRD yang lebih mendekati puncak hidroksiapatit murni dengan intensitas 100 yang memiliki sudut 2 31,99o. Secara umum adsorpsi congo red tanpa dan dengan penambahan H2O2 terjadi peningkatan kapasitas teradsorpsi seiring dengan bertambahnya konsentrasi congo red dan lebih tinggi dibandingkan serbuk tulang kontrol (T0).

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