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Ni Made Suaniti
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jurnalkimia@unud.ac.id
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+6281236815916
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jurnalkimia@unud.ac.id
Editorial Address
Program Studi Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Udayana Kampus Bukit Jimbaran, Jimbaran, Bali, Indonesia
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Kab. badung,
Bali
INDONESIA
Jurnal Kimia (Journal of Chemistry)
Published by Universitas Udayana
ISSN : 19079850     EISSN : 25992740     DOI : 10.24843/JCHEM
Core Subject : Science,
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.
Articles 383 Documents
PENENTUAN KADAR GLUKOSA DAN FRUKTOSA PADA MADU RANDU DAN MADU KELENGKENG DENGAN METODE KROMATOGRAFI CAIR KINERJA TINGGI Ratnayani, K.; Dwi Adhi S., N. M. A.; Gitadewi, I G. A. M. A. S.
Jurnal Kimia (Journal of Chemistry) Vol. 2, No. 2 Juli 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

Honey is composed of reducing sugars i.e. glucose, fructose, and maltose. The concentration of sugar honeyis determined as total reducing sugars, so the concentration of each sugar which compose the honey is not known.The research aims to determine the concentrations of glucose and fructose of honey from different cotton tree honeyand longan honey HPLC using.The HPLC operational condition was as follows 80oC of column temperature and 1 mL/minutes of flowrate, using metacarb 87C column and deionized watr as eluent. The detection was carried out by using refractiveindex detector, where glucose and fructose can be separated at retention times of 6 and 7 minutes.The result of research showed that the concentration of glucose in cotton tree honey was 27.13 % and inlongan honey was 28.09 %. the concentration of fructose in cotton tree honey was 40.99 % and in longan honey was40.03 %. Thees results showed that the quality standard on the total concentration of reducing sugar (60 %) was metby both types of honey. The total concentration of reducing sugar of cotton tree honey was 68.12 % and of longanhoney was 68.12 %.
KAPASITAS ADSORPSI SERBUK NATA DE COCO (BACTERIAL SELLULOSE) TERHADAP ION PB2+ MENGGUNAKAN METODE BATCH Saputri, C. A.
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 (109.552 KB) | DOI: 10.24843/JCHEM.2020.v14.i01.p12

Abstract

Penelitian ini bertujuan untuk menentukan kapasitas adsorpsi serbuk nata de coco terhadap ion Pb2+. Nata de coco merupakan selulosa yang diperoleh dari fermentasi bakteri Acetobacter xylinum. Serbuk nata de coco dibuat dengan menghaluskan nata de coco kemudian dipanaskan pada suhu 80oC, dihaluskan dan diayak hingga berukuran 30-40 mesh. Karakterisasi meliputi pengukuran kadar air, kadar abu, massa jenis dan daya serap terhadap larutan Iod. Penentuan waktu kontak optimum menggunakan metode batch dengan variasi waktu 20, 40, dan 60 menit. Penentuan kapasitas adsorpsi menggunakan pola isoterm Langmuir dan Freundlich menggunakan variasi konsentrasi ion Pb2+ 15, 30, 45, dan 60 ppm. Banyaknya ion yang terserap diukur menggunakan Atomic Absorption Spectrophotometry (AAS) pada panjang gelombang maksimal Pb2+ yaitu 283 nm. Hasil menunjukkan bahwa waktu optimum tercapai pada menit ke 60. Pola adsorpsi mengikuti model isoterm Freundlich dengan kapasitas adsorpsi sebesar  2,34 mg/g.   Kata kunci: isoterm Freundlich, kapasitas adsorpsi, ion Pb2+, serbuk nata de coco.
KANDUNGAN TOTAL FENOL DAN FLAVONOID DARI BUAH KERSEN (MUNTINGIA CALABURA) SERTA AKTIVITAS ANTIOKSIDANNYA Senet, Made Ratih Mettaswari; Parwata, I Made Oka Adi; Sudiarta, I Wayan
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 (363.217 KB) | DOI: 10.24843/JCHEM.2017.v11.i02.p14

Abstract

Buah kersen (Muntingia calabura) merupakan salah satu buah yang memiliki manfaat tinggi untuk kesehatan dan dapat dikonsumsi sebagai alternatif pengganti obat. Penelitian ini bertujuan untuk mengetahui kandungan total fenol dan flavonoid dari buah kersen serta menguji aktivitas antioksidannya. Sampel buah kersen sebanyak 1,56 kg di ekstraksi secara bertingkat dengan metode maserasi menggunakan pelarut n-heksana, etil asetat, dan etanol yang menghasilkan ekstrak n-heksan (2,16 g), etil asetat (4,52 g), dan etanol (50,25 g). Hasil penapisan fitokimia menunjukan ekstrak etanol dan ekstrak etil asetat positif mengandung flavonoid dan fenol. Ekstrak etanol dan ekstrak etil asetat selanjutnya diukur kandungan total fenol dan flavonoidnya dengan metode spektrofotometri UV-Vis. Hasil pengukuran menunjukakan kandungan total fenol ekstrak etanol dan etil berturut-turut sebesar 0,24 % GAE dan 0,85 % GAE sedangkan kandungan total flavonoidnya berturut-turut 0,13 % QE dan 0,03 % QE. Aktivitas antioksidan ekstrak etil asetat dan etanol yang diukur dengan metode DPPH memberikan nilai IC50 berturut-turut sebesar 0,13 mg/mL dan 0,25 mg/mL.
SPESIASI DAN BIOAVAILABILITAS LOGAM TEMBAGA (CU) PADA BERBAGAI UKURAN PARTIKEL SEDIMEN DI KAWASAN PANTAI SANUR Indra Yanthy T, Kristina; Sahara, Emmy; Kunti Sri Panca Dewi, I G. A.
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

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Abstract

A research on bioavailability and speciation of Cu in various sediment particle sizes collected from three sampling sites namely, Sanur, Sindhu and Mertasari Beaches along Sanur Beach was carried out. This study was aimed to determine the fractions of Cu available for aquatic organism and the geochemical forms of Cu in the sediments. Samples pretreatment were carried out by digestion with the use of the mixture of HNO3 and HCl (3:1). The bioavailability and speciation were accomplished by the appliation of  single exraction (with EDTA and HCl ) and sequential extraction techniques. Generally, it was found that EDTA extraction yielded higher bioavailability than that of HCl extraction. The highest bioavailability of Cu was showed by the sediment from Sanur Beach and Sindhu Beach at particle size of < 63 µm and from Mertasari Beach at particle size of 63-106 µm. From Cu speciation results it was found that the bioavailable (fractions of easily, freely, leachable, and exchangeable (EFLE), Fe/Mn oxide, organic and sulphide) and the resistant fractions were as follows: Sanur Beach at particle size of <63 µm were 8,28% and 10,31%, particle size of 63-106 µm were 5,34% and 9,13%, and particle size of >106 µm were 18,07% and 5,26%. Sindhu Beach at particle size of <63 µm were 17,32% and 15,69%, particle size of 63-106 µm were 6,98% and 9,92%, and particle size of >106 µm were 7,28% and 7,77%. Mertasari Beach at particle size of <63 µm 8,85% and 11,79%, particle size of 63-106 µm were 13,33% and 20,85%, and  particle size of  >106 µm were 17,99% and 38,42%.
ADSORPSI ION LOGAM PB2+ DAN CU2+ OLEH BENTONIT TERAKTIVASI BASA (NAOH) Indah Kumala Dewi, Putu Aprilliana; Suarya, Putu; Sibarani, James
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

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Abstract

The aim of this study is to determine the adsorption capacity of NaoH activated bentonites in reducing metal ions Pb2+ and Cu2+ from their solutions. The characterization of the activated bentonites was carried out by determining the specific surface area using methylene blue adsorption method, the numbers of the active site by acid-base titration, and determining the basal spacing using X-ray diffraction (XRD). Adsorption parameters such as contact time, pH, and the isotherm adsorption curves were determined by atomic absorption spectrophotometer (AAS). The specific surface area and the number of active sites of the NaOH-activated Bentonite were 22.1017 m2/g and 32.8716 x 1020 atoms/g respectively. This vakue was higher than non-activated ones which were 12.6602 m2/g and 31.5847 x 1020 atoms/g respectively. The optimum condition of Pb2+ adsorption on activated bentonite was obtained at pH 3 with contact time under 5 minutes following the Langmuir isoterm pattern while the optimum condition of Cu2+ adsorption was obtained at pH 4 with contact time under 5 minutes following the Langmuir isoterm adsorption suggesting that the adsorption took place by chemical adsorption. The adsorption capacities of Pb2+ and Cu2+ were 185.50 mg/g and 30.00 mg/g respectively.
KARAKTERISASI KEASAMAN DAN LUAS PERMUKAAN TEMPURUNG KELAPA HIJAU (COCOS NUCIFERA) DAN PEMANFAATANNYA SEBAGAI BIOSORBEN ION CD2+ Widihati, I. A. G.; Ratnayani, Oka; Angelina, Yunita
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

The characterization of surface acidity and area of green coconut shell (Cocos nucifera) and the applicationof the shell as biosorbent of Cd2+ have been conducted in this study. The physico-chemical characterization of thebiosorbent was observed by surface acidity measurement using gravimetry, acid base titration, and infraredspectrofotometry, and the surface area was determined by spectrofotometer UV-Vis using methylen blue method.The use of this shell as biosorbent of Cd2+ was studied by the equilibrium time, the adsorption isotherms, theadsorption capacity, and the influence of pH on adsorption capacity.The result showed that the acidity surface of the green coconut shell determined using gravimetric and acidbase titration was 39.2647 mmol/g and 39.8843 mmol/g. The surface area was 36.5961 m2/g. The adsorption capacityof green coconut shell (Cocos nucifera) as biosorbent of Cd2+ was 2.5135 mg/g at 4 hours equilibrium time with Cd2+and initial concentration (adsorption isotherms) of 50 ppm. At pH 11.00 the adsorption capacity of biosorbent onCd2+ increased to 2.7857 mg/g.
PERBANDINGAN METODE UJI GULA PEREDUKSI DALAM PENENTUAN AKTIVITAS ?-L-ARABINOFURANOSIDASE DENGAN SUBSTRAT JANUR KELAPA (COCOS NUCIFERA) Pratiwi, Y. H.; Ratnayani, O.; Wirajana, I N.
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 (262.228 KB) | DOI: 10.24843/JCHEM.2018.v12.i02.p07

Abstract

Pengujian  gula pereduksi umumnya dilakukan dengan reagen asam 2,3-dinitrosalisilat (DNS) dan Nelson-Somogyi (NS) dalam penentuan aktivitas enzim pendegradasi polisakarida. Tujuan penelitian ini adalah untuk membandingkan metode uji gula pereduksi DNS dan NS dalam penentuan aktivitas ?-L-Arabinofuranosidase (AbfA) termostabil, dengan substrat janur kelapa (Cocos nucifera). Enzim AbfA diperoleh dari Saccharomyces cerevisiae rekombinan yang dikultivasi selama 3 hari pada suhu inkubasi 30 °C.  Penentuan aktivitas enzim AbfA dilakukan pada kondisi pH 6, suhu 70 °C dan waktu inkubasi 15 menit. Hasil penelitian menunjukkan bahwa penentuan aktivitas enzim AbfA dengan metode NS lebih teliti atau memiliki standar deviasi yang jauh lebih kecil dibandingkan dengan metode DNS, namun kurva kalibrasi larutan standar metode DNS lebih linear dibandingkan  metode NS.
ISOLASI DAN IDENTIFIKASI SENYAWA SITOTOKSIK DAUN NAGASARI (CALOPHYLLUM NAGASSARIUM BURM.F.) TERHADAP LARVA ARTEMIA SALINA LEACH Pramana Eka Putra, I Wayan; Rahayu Santi, Sri; Rustini, Ni Luh
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

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Abstract

Calophyllum nagassarium Burm.f. or nagasari is a kind of plant that often be used as medical plant such as for antiseptic, laxative, blood purifier, helminthic, and tonic. This study aimed to isolate and identify cytotoxic compounds of nagasari leaves by extracting 1000 g of leaf powder with 10 L of 96% ethanol  (5L x 2) to produce 66.81 g of ethanol extract (LC50 = 19.06 ppm). Fractionation of the ethanol-water extract (7: 3) in a row with 300 mL of n-hexane, chloroform 400 mL, 400 mL of n-butanol, and water and toxicity tests against larvae of Artemia salina Leach generate 2.52 g of n-hexane extracts (LC50 = 275.42 ppm), 7.06 g chloroform extract (LC50 = 63.10 ppm), 9.54 g of n-butanol extract (LC50 = 27.54 ppm) and 25.38 g aqueous extract (LC50 = 478 , 63 ppm). N-buthanol extract which was the most toxic was then separated, purified and identified. The separation of 2.0 g of n-butanol extract using column chromatography techniques with silica gel 60 as the stationary phase and chloroform- n-butanol (5: 3) as the mobile phase resulted in 5 fractions (F1, F2, F3, F4, and F5). Fraction F1 which was the most toxic (LC50 = 91.20 ppm) was then separated by preparative Thin Layer Chromatography and resulted two fractions (FA and FB). Fraction FB was the most toxic with LC50 = 83.18 ppm. UV-Vis and IR spectrophotometric analysis of FB identified a compound suspected to be terpenoides that has the characteristics of functional groups such as O-H, O = C-OH, aliphatic C-H.
ANALISIS ASAM LEMAK RUMPUT LAUT ULVA RETICULATA FORSSKAL YANG DIPEROLEH DARI PANTAI SEGARA SANUR Puspawati, Ni Made; Made Dwi Suastuti, Ni Gusti Ayu; Indra Dewi, Dewa Ayu
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

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Abstract

Lipid content and fatty acid composition of seaweed Ulva reticulata Forsskal obtained from Segara Sanur Beach have been analyzed. Lipid was extracted from this seaweed using soxhlet extractor with chloroform:methanol (2:1) as solvent, while the composition of fatty acid was analysed using gas chromatrography accomplished by a mixture of 37 standard fatty acids (ST37AL85.D01). It was found that Ulva reticulata Forsskal contained (1,41±0,04)% (w/w) of crude lipids. The crude lipid was composed of 11 major fatty acids including pentadecanoic acid (12,08%), heptadecanoic acid (40,00%), cis-10-heptadecenoic acid (4,37%), oleic acid (1,77%), linolelaidic acid (4,31%), linoleic acid (13,01%), arachidic acid (4,71%), g-linolenic acid (2,27%), heneicosanoic acid (7,58%), cis-11,14-eicosedienoic acid (8,19%), and cis-8,11,14-eicosetrienoic acid (1,71%).
SINTESIS DAN KARAKTERISASI EDIBLE FILM BERBAHAN BAKU GELATIN HASIL ISOLASI KULIT CEKER AYAM BROILER Sutha Negara, I Made; Simpen, I Nengah
Jurnal Kimia (Journal of Chemistry) Vol. 8, No. 1 Januari 2014
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 of synthesis and characterization of edible films base material on gelatin which is isolated from chiken feet skin of broiler has been carried out. The gelatin of isolation product as raw material to produce edible film, through determination of optimum condition with the study variaty concentrations of gelatin (%, m/v) such as 10%, 18%, and 20%, and variety concentrations of glycerol plastisizer (% m/v) such as 1.0%; 1.8%; and 2.0% or the ratio of gelatin and glycerol was 10:1. The edible films which produced was analyzed its quality, to determine characteristic of  physico-chemical properties such as water content, solubility edible films in water and fuctional groups by infrared (FTIR). The gelatin without treatment (without mixture with glycerol) as control. The research showed that increasing glycerol (plastisizer) content can increase water content and solubility edible film in water, because glycerol properties which more easy to bond with water molecular so that good solubility in water. The analysis result of FTIR showed that  the adition of glycerol can move absorption, generally increasing on amide A, amide II and amide III. The analysis result of  LIBS showed that the intensity of atomic content such as C atom on wavelenght of 283, 426, and 723 nm, H atom on wavelenght of 434 and 484 nm, and O atom on wavelenght of 777 and 844 nm for edible films possess relative emission intensity higher then control. The edible films with gelatin and glycerol ratio 20:1.0 glycerol) indicate better properties (the best condition).

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