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Jurnal Kimia (Journal of Chemistry)

jchem
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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 21 Documents

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Search results for , issue "Vol. 9, No. 2 Juli 2015" : 21 Documents clear

KAPASITAS ADSORPSI BEBERAPA JENIS KULIT PISANG TERAKTIVASI NaOH SEBAGAI ADSORBEN LOGAM TIMBAL (Pb) Putu Eka Purnama; I Gusti Ayu Kunti Sri Panca Dewi; Ketut Ratnayani
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

Adsorption capacity of various types of banana skin (green, kepok and susu) activated with NaOH as adsorbents for lead (Pb) has been studied. This research consisted of several steps included determination of the surface area of activated and unactivated adsorbents, equilibrium time, adsorption isotherms and adsorption capacity of adsorbents from green, kepok and susu banana skins activated with NaOH . The results showed that adsorbents from green, kepok and susu banana skin activated with NaOH had surface were of 36.2181 m2/g, 35.5531 m2/g and 35.8378 m2/g respectively. On the other hand, the surface area of unactivated adsorbents of green, kepok and susu banana skin were 35.3105 m2/g, 35.3199 m2/g, and 35.7928 m2/g respectively. Equilibrium time for green, kepok and susu banana skin adsorbents activated with NaOH were 30; 30 and 90 minutes. Adsorption isotherms of adsorbents from green, kepok and susu banana skin activated with NaOH were at concentration 100 ppm. Adsorption capacity of activated adsorbents from green banana, kepok banana and susu banana skin were 7.022 mg/g, 5.3078 mg/g and 6.6850 mg/g respectively.

ADSORPSI ION LOGAM Pb2+ DAN Cu2+ OLEH BENTONIT TERAKTIVASI BASA (NaOH) Putu Aprilliana Indah Kumala Dewi; Putu Suarya; James Sibarani
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

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.

SEQUENTIAL EXTRACTION UNTUK PENENTUAN BIOAVAILABILITAS LOGAM Co DAN Ni DALAM SEDIMEN DI KAWASAN PERAIRAN PELABUHAN BENOA DENPASAR BALI Yulius Leo Adeputra; Emmy Sahara; A. A. I. A. M. Laksmiwati
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

This research was aimed to establish the total concentrations of Ni and Co and then to determine the fractions of various species of the two metals in the sediments. The bioavailability of Co and Ni was determined using sequential extraction technique. The total concentrations of Co and Ni obtained in the sediment were 27.2484 mg/Kg and 41.9458 mg/Kg, respectively. The speciation of Co and Ni found the sediment were 29.83% and 55.86 % in the EFLE fraction; 4.04% and 6.40% in the fraction of Fe / Mn oxides; 13.72 % Co and Ni not detectable in the organic-sulfide fractions; 46.15% and 38.14% in the resistant fraction. Therefore the bioavailability of Co and Ni obtained in the Benoa Port sediment were of 12.9653mg/Kg and 23.3565 mg/Kg respectively.

ISOLASI KITIN, KARAKTERISASI, DAN SINTESIS KITOSAN DARI KULIT UDANG Sry Agustina; I Made Dira Swantara; I Nyoman Suartha
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

Chitosan is the modification of chitin which found on the outer skin of Crustacea species such as shrimps and crabs. This study aims to isolate chitin, syntesize and charactetize chitosan from shrimp shells. Chitin isolation stage included demineralization using HCL 1.5M and deproteination step with NaOH 3.5%. Transformation of chitin into chitosan was done through the deacetylation reaction by using NaOH 60%. The result showed that characteristic of the chitosan obtained in this research was as follows: the yield of transformation chitin into chitosan was 67.08%; it had a white color powder texture with had no smell; water content 1.55%; It solubled in 2 % acetic acid with 84.85 % deacetylation.

ISOLASI DAN IDENTIFIKASI SENYAWA GOLONGAN FLAVONOID PADA DAUN NANGKA (Artocarpus heterophyllus Lmk) DAN AKTIVITAS ANTIBAKTERI TERHADAP BAKTERI Staphylococcus aureus Anak Agung Sagung Krisna Darmawati; I Gusti Agung Gede Bawa; I Wayan Suirta
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

Isolation, identification and antibacterial activity of flavonoid compounds from jackfruit leaf (Artocarpus heterophyllus Lmk) extract have been done in this research. Extraction of 500 g dry powder of jackfruit leaf using maceration method produced 31.20 g concentrated brownish green ethanol extract. Partition of 30.00 g the ethanol extract gained three concentrated extracts in n-hexane (4.46 g), chloroform (0.84 g) and n-buthanol (6.65 g) fractions. The phytochemical test showed that n-buthanol extract contained flavonoid compound which was active as antibacterial agent with 15.75 mm inhibition capacity. Column chromatography analysis on n-buthanol extract with mobile phase n-hexana: ethyl acetate: n-butanol (8:2:1) gave 8 fractions (FA, FB, FC, FD, FE, FF, FG, FH). Phytochemical testing showed that fraction FA and fraction FH belong to flavonoide compounds. Analysis of FA using UV-Visible gained 2 peaks at ? 323.40 nm (band I) and ? 285.60 nm (band II) which indicated the flavonoide groups of flavanone or dihydroflavonol. Analysis of FH using UV-Visible gained 2 peaks at ? 323.40 nm (band I) and ? 285.60 nm (band II) suggested the flavonoide groups of flavone or flavonol (3-OH substitution).` By using shiffting reagent the isolate FA was suggested to contain dihydroflavonol group and FH was suggested to contain flavone with hydroxyl groups at C-2’, C-4’.C-5’, C-6’, C-6, C-7, and C-8. Infrared analysis showed that the isolate had –OH, C=O, C-O, C=C aromatic, CH aromatic, and CH aliphatic groups. Antibacterial testing of flavonoid compounds of fraction A and fraction H on Staphylococcus aureus with a concentration of 10.000 ppm inhibited 10.50 mm for fraction A and 7.25 mm for fraction H.

PERBANDINGAN AKTIVITAS SPESIFIK EKSTRAK KASAR ENZIM BROMELIN BUAH NANAS YANG DIISOLASI DENGAN BEBERAPA JENIS GARAM PENGENDAP I. A. Preharsini Kusuma; A. A. I. A. M. Laksmiwati; Made Arsa; Ketut Ratnayani
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

The aim of this research was to find specific activity of bromelain enzyme extracted from crude extract of pineapple fruit (Queen variety) by salting out method using three different salts, which were (NH4)2SO4, NaCl, and Kusamba traditional salt. Crude extract of bromelain enzyme was obtained by precipitation method using salt with different levels of saturation. This study included determination of total protein concentration by using Biuret method and protease activity by using Anson method to get the specific activities of the crude extract. The results showed that the highest specific activities of bromelain enzymes precipitated with the three salts (NH4)2SO4, NaCl and Kusamba traditional salt with the ratio of 1: 0.94: 0.56 were 0.2887 U/mg (at 20% saturation) ; 0.2705 U/mg (at 40% saturation) and 0.1623 U/mg (at 80% saturation). Fractination of enzyme with the NaCl and Kusamba traditional salt gave smaller specific activity value than (NH4)2SO4. This results may caused of NaCl had smaller ionic strength, the presence of other ions in Kusamba traditional salt and the different solubility of bromelain enzyme in different salts. However, due to the ratio of NaCl approached (NH4)2SO4 and the availability of Kusamba traditional salt they could be used as alternative salts to replace (NH4)2SO4 in fractination bromelain enzyme from crude extract of pineapple fruit

AKTIVITAS ANTIOKSIDAN ANTOSIANIN DALAM EKSTRAK ETANOL KULIT BUAH NAGA SUPER MERAH (Hylocereus costaricensis) DAN ANALISIS KADAR TOTALNYA Ni Ketut Meidayanti Putri; I Wayan Gede Gunawan; I Wayan Suarsa
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

Dragon fruit is a plant that comes from dry tropical climate zones. Besides the flesh of the dragon fruits,,its skin can be used in food production as a natural food coloring and as the raw materials in cosmetics manufacturing. This is because of that the skin of the dragon fruit contains some compounds such as anthocyanin that can be used as an antioxidant. This study were aimed to determine the antioxidant activity, total anthocyanin content and the type of anthocyanins in the ethanol extract of super red dragon fruit skin. The determination of antioxidant activity of anthocyanin was carried out by the use of DPPH method, whereas the determination of the total content of anthocyanin was performed with a pH difference method using UV-Visibel spectrophotometer. The results showed that the optimum scavenger percentage of the extract was of 97.84% with IC50 value of 73.2772 mg / L, whereas the average levels of total anthocyanins obtained was of 58.0720 ± 0,0001mg / L. The type of anthocyanins contained in the ethanol extract of the skin of super red dragon fruit was sianidin showing a maximum peak at a wavelength of 547 nm.

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

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.

PENGARUH KONSENTRASI ASAM FOSFAT DAN BERAT SEMEN PUTIH SEBAGAI ADSORBEN DALAM PEMURNIAN CRUDE GLISEROL Lestari Lestari; Made Arsa; I Wayan Suirta
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

The research of purification process of crude glycerol using phosphoric acid and white cement as adsorbent has been carried out. The aim of this research was to study the effect of phosphoric acid concentration and weight of white cement used as adsorbent in the purification process to the purity of glycerol. The research was done by the addition phosphoric acid in crude glycerol followed by adsorption with white cement. Glycerol quality parameters were determined by assesment of glycerol density, viscosity, and by comparing its GC-MS spectra to GC-MS spectra of standard glycerol. The result showed that purification process of glycerol using 5 % phosphoric acid and 5 grams of white cement gave the highest level of glycerol which was 84.20%. The density of purified glycerol obtained in this research was 1.2595 ± 3.1622 x 10-5 g/mL, the viscosity was 1.4372 ± 3.8333 x 10-3 Pa.s, and the GC_MS spectra purified glycerol showed similar fragmentation pattern and retention time with the glycerol standard.

SPESIASI DAN BIOAVAILABILITAS LOGAM BERAT TIMBAL (Pb) DAN TEMBAGA (Cu) DALAM SEDIMEN SUNGAI TUKAD BADUNG Nanik Wijayanti; I Made Siaka; Ida Ayu Gede Widihati
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

A study of speciation and bioavailability of heavy metals, Pb and Cu in sediments of Tukad Badung river with sequential extraction method has been carried out. This study aimed to determine the levels of bioavailability of both Pb and Cu heavy metals. The determination of total heavy metal contents was performed by digestion technique with the use of a mixture of HNO3 and HCl (3:1) in ultrasonic bath for 45 minutes at 60oC followed by heating on a hotplate for 45 minutes at 140oC. The mesurement of total heavy metals and heavy metal species was established with the use of Atomic Absorption Spectrophotometer (AAS) with calibration curve method. Concentration of total Pb and Cu in the sediments of Tukad Badung river ranged from 4.2669 to 27.9171 mg/kg and 20.5240 to 69.3782 mg/kg respectively. The speciation of Pb obtained in carbonate fraction of the EFLE (easly, freely, leachable and exchangable) fractions ranged from 1.5952-11.6315 mg/kg, in Fe/Mn oxide fraction ranged from 0.4001 to 6.7680 mg/kg, in organic/sulfide fraction ranged from 0.8759 to 13.6600 mg/kg, and in the silicate fraction (resistant) ranged between Nd (not detected) to 4.6598 mg/kg. The level of bioavailability Pb in sediments ranged from 9 to70% while the non-bioavailability levels ranged from 0 to 30%. Carbonate fraction (EFLE) of Cu ranged between Nd (not detected) to 6.3527 mg/kg. The fraction of Fe/Mn oxides ranged from 0.7331 to 9.9033 mg/kg, organic sulfide fraction ranged from 8.1790 to 41.5756 mg/kg, and the silicate fraction was foud vary between 7.5138 and 21.0200 mg/kg. The level of Cu bioavailability in sediments ranged from Nd (not detectable) to 18%, while the level of non bioavailability ranged from 15 to 44%.

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Home Page

OAI Link

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Contact

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Contact Name Ni Putu Diantariani

Contact Email jurnalkimia@unud.ac.id

Phone +628123640424

Journal Mail Official jurnalkimia@unud.ac.id

Editorial Address Program Studi Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Udayana Kampus Bukit Jimbaran, Jimbaran, Bali, Indonesia

Location Kota denpasar, Bali INDONESIA

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Contact Name
Ni Putu Diantariani

Contact Email
jurnalkimia@unud.ac.id

Phone
+628123640424

Journal Mail Official
jurnalkimia@unud.ac.id

Editorial Address
Program Studi Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Udayana Kampus Bukit Jimbaran, Jimbaran, Bali, Indonesia

Location
Kota denpasar,

Bali

INDONESIA