Garuda - Garba Rujukan Digital

Article Per Year (5 Year)

All

Jurnal Kimia (Journal of Chemistry)

jchem
Website

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

4 5 6 7 8

KANDUNGAN LOGAM TOTAL Pb DAN Cu PADA SAYURAN DARI SENTRA HORTIKULTURA DAERAH BEDUGUL G. A. Henny Kurnia Ratnasari; I M. Siaka; Ni G. A. M. Dwi Adhi Suastuti
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

This paper discusses the determination of total metal content of Pb and Cu in vegetables from horticultural center of Bedugul area. Determination of the metals was performed by applying digestion method to the samples. Reverse aqua regia (a mixture of HNO3 and HCl, 3:1) was used to digest the samples in an ultrasonic bath for 45 min at 60° C, followed by heating on a hotplate for 45 minutes at 140oC. Solution resulted from the digestion was analyzed by the use of atomic absorption spectrophotometer (AAS) to determine metal concentrations of Pb and Cu through standard calibration curve. The results showed that Pb and Cu metals accumulated in 6 types of vegetables were varied. It was found that carrots contained the highest Pb (13.7218 mg/kg), while the lowest concentration of Pb was found in cabbage (1.4912 mg/kg). Meanwhile, the highest Cu metal content was found in celery which was 2.8073 mg/kg, but the lowest in sprouts i.e 0.7830 mg/kg.

PEMBUATAN DAN KARAKTERISASI ARANG AKTIF DARI BATANG TANAMAN GUMITIR (TAGETES ERECTA) DENGAN AKTIVATOR NaOH Emmy Sahara; Ni Kadek Dahliani; Ida Bagus Putra Manuaba
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

Dalam penelitian ini dilakukan pembuatan dan karakterisasi arang aktif dari batang tanaman gumitir (Tagetes erecta) menggunakan aktivator NaOH. Penelitian ini bertujuan untuk membuat arang aktif dan menentukan konsentrasi NaOH optimum yang dibutuhkan untuk mendapatkan arang aktif dengan karakteristik yang baik ditinjau dari kadar air, kadar zat mudah menguap, kadar abu total, kadar karbon, daya serap terhadap metilen biru, dan daya serap terhadap iod. Hasil penelitian menunjukkan bahwa arang aktif yang diaktivasi dengan natrium hidroksida (NaOH) 2,5% menghasilkan arang aktif dengan karakteristik terbaik dan memenuhi standar baku mutu SNI 06 – 3730 – 1995 tentang arang aktif teknis. Arang aktif yang diperoleh dalam penelitian ini memiliki kadar air sebesar 1,25 ± 0,02%, kadar zat mudah menguap sebesar 12,00 ± 0%, kadar abu total sebesar 5,33 ± 0,41%, kadar karbon sebesar 81,41%, daya serap terhadap metilen biru sebesar 199,97 ± 0,07 mg/g, dan daya serap terhadap I2 sebesar 728,09 ± 2,16 mg/g. Hasil analisis dengan spektrofotometer FTIR menunjukkan bahwa arang aktif tersebut mempunyai gugus fungsi C-H alifatik, C=O, C=C aromatik, dan O-H ikatan hidrogen

AKTIVITAS ANTIBAKTERI EKSTRAK DAUN TENGGULUN (Protium javanicum Burm. F.) TERHADAP BAKTERI Staphylococcus aureus N. M. Puspawati; N. L. P. F. Widiari; I M. Sukadana
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

This study aims to examine the antibacterial activity of n-hexane, ethyl acetate, and n-butanol extract of tenggulun leaves (Protium javanicum Burm. F.) in inhibiting the growth of S. aureus bacteria and determine the minimum inhibitory concentration of the most active extracts and identify its active compounds. A total of 1000 g of tenggulun leaf powder was macerated with methanol and 91.78 g of crude methanol extract was obtained which was further partitioned into n-hexane, ethyl acetate, and n-butanol extracts. Antibacterial activity test was carried out using the diffusion well method and the result showed that the ethyl acetate extract at a concentration of 20% was strongly able to inhibit the growth of S. aureus bacteria with inhibition zones of 20.08 mm, followed by n-butanol 16.66 mm, and n-hexane 13.33 mm. The minimum concentration of ethyl acetate extract was 0.2% in inhibiting the growth of S. aureus with inhibition zone diameter of 6.20 mm. Separation of the active ethyl acetate extract was conducted by silica gel column chromatography with mobile phase of n-hexane: ethyl acetate (7.5: 2.5) gave 6 combined fractions. Fractions B, G, H and I showed antibacterial activity at concentrations of 50% with a diameter of inhibition zone of 5.62 mm, 6.87 mm, 8.50 mm, and 6.75 mm respectively. The results of mass spectra analysis from the chromatogram peaks of LC-MS / MS suggested that the G and I fractions were tentatively identified as crotarin, benzophenone-2, and medroxyprogesterone acetate which may contributed to the antibacterial activity by acting synergisticly. Keywords: antibacterial, tenggulun, Staphylococcus aureus, LC-MS/MS.

PREPARASI DAN KARAKTERISASI KOMPOSIT KROMIUM OKSIDA-MONTMORILLONIT I M. Sutha Negara; Karna Wijaya; Eko Sugiharto
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (632.878 KB)

The objectives of this research were to prepare montmorillonite and of chromium oxide-montmorillonitecomposite by intercalation of oxide of chrom into the silicates interlayer of montmorillonite, and to characterizesome of their physical and chemical properties. The characterization indicated that the basal spacing d001 wasincreased from 14,11 in montmorillonit to 15,55 in chromium oxide-montmorillonite; specific surface area wasincreased from 69,71 m2/g to 240,40 m2/g; total pore volume was also increased from 0,05 mL/g to 0,128 mL/g; andchrom content also increased from 0,007% (w/w) to 17,16 % (w/w).

EFEKTIVITAS LUMPUR AKTIF DALAM MENURUNKAN NILAI BOD (Biological Oxygen Demand) DAN COD (Chemical Oxygen Demand) PADA LIMBAH CAIR UPT LAB. ANALITIK UNIVERSITAS UDAYANA Yudith Rizkia Widyawati; Ida Bagus Putra Manuaba; Ni Gst Ayu Made Dwi Adhi Suastuti
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

This research was conducted to determine the effectivity of activated sludge to decrease the Biological Oxygen Demand (BOD) and Chemical Oxygen Demand (COD) of waste water produced by the UPT. Lab Analitik Udayana University. This research used varied sediment masses and aeration times in order to determine the optimum conditions of activated sludge and the effectivity. Variation of the masses were 5, 10 and 20 grams and the aeration times were 1; 2; 3; 4 and 5 days. The result showed that both parameters studied decreased as a result of biological activity which oxidizes organic and inorganic compounds contained in the waste water. Five grams sediment within aeration time 4 days were the most optimum condition in decreasing the BOD (up to 75,25 %) and COD (up to 58,08 %). The results of One-way ANOVA showed there were a significant difference between BOD and COD before and after 3 , 4 and 5 days treatment.

ISOLASI GELATIN DARI KULIT KAKI AYAM BROILER DAN KARAKTERISASI GUGUS FUNGSINYA DENGAN SPEKTROFOTOMETRI FTIR N. M. Puspawati; I N. Simpen; I N. Sumerta Miwada
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (216.797 KB)

Gelatin is a biopolymer that can be obtained from partially hydrolysis of collagen present in skin, bone, and connective tissues of animals. The aim of the present work is to isolate and characterize gelatin obtained from chicken feet Broiler’s skin after curing with acid and base. Isolation of gelatin from skin of chicken feet Broiler was performed by water-bath extraction through type A (acid) and type B (base) processes. CH3COOH 1.5% (GA) was used for acid-curing, and NaOH 2.0% (GB) for base-curing processes with 2 days soaking time. Gelatin prepared from acid-curing (GA) gave yield 8.47%, protein content 82.59%, and 23.50%. While gelatin from alkali process (GB) gave yield 7.37%, protein content 79.75% %, and fat content 15.76%. FTIR spectra of GA and GB were very similar. Both GA and GB exhibited peaks at wavelength number for region of amide A, amide I, II, and III which a characteristic for gelatin functional groups. GB exhibited peaks at 1242 cm-1 with low intensity in the amide III region while GA did not. This result is associated with the loss of triple helix or denaturation of collagen to gelatin. Based on FTIR results it can be concluded that GA and GB obtained were true gelatins, although GA gave a better result.

DEGRADASI FOTOKATALITIK FENOL MENGGUNAKAN FOTOKATALIS ZnO DAN SINAR UV Dessy Gilang Permata; Ni Putu Diantariani; Ida Ayu Gede Widihati
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

Telah dilakukan penelitian mengenai degradasi fotokatalitik fenol menggunakan fotokatalis ZnO dan sinar UV. ZnO disintesis menggunakan metode pengendapan dan dikarakterisasi menggunakan Difraksi Sinar-x (XRD) dan Scanning Electron Microscope (SEM). Degradasi fotokatalitik fenol meliputi penentuan pH optimum, jumlah fotokatalis optimum, waktu reaksi optimum, dan efektivitas degradasi fotokatalitik. Hasil karakterisasi XRD menunjukkan ZnO memiliki struktur kristal heksagonal wurtzite dengan ukuran kristal 28,05 nm. Dari hasil karakterisasi SEM menunjukkan ZnO yang dihasilkan berbentuk bulat. Kondisi optimum degradasi fotokatalitik fenol dengan fotokatalis ZnO yaitu pH optimum 8, jumlah fotokatalis ZnO optimum 40 mg, dan waktu optimum radiasi 8 jam. Efektivitas degradasi fotokatalitik fenol pada kondisi optimum sebesar (63,52±3,48)%.

SINTESIS DAN KARAKTERISASI ZEOLIT-TiO2 SERTA PEMANFAATANNYA SEBAGAI FOTOKATALIS UNTUK DEGRADASI RHODAMIN B W. A. Fauzi; I N. Simpen; I W. Sudiarta
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

The synthesis of zeolite-TiO2 composite has been successfully performed by mixing the H2SO4-enriched natural zeolite to TiO2. The composites are formed then characterized functional groups using Fourier Transform Infrared (FTIR) and surface area with BET (Breunaur, Emmet and Teller) method. The characterization results showed that the synthesis of zeolite-TiO2 composites is relatively successful. Those can be seen from BET characterization higher to the composite surface area from 63.031 m2/g to 73.913 m2/g, then reinforced by the appearance of the functional groups of TiO2 in zeolite at wavelength 2345.44 cm-1, 792.74 cm-1 and 424.34 cm-1. Furthermore, the composite is used for the photodegradation of rhodamin B dyes with the highest degradation percentage was 97.39% in optimal irradiation contact time was reached at 10 minutes and the effective pH of 4

A TRITERPENOID COMPOUND FROM THE STEMBARK OF Aglaia argentea (MELIACEAE) A. T. Hidayat1; K. K. Farabi; M. M. Muhammad; D. D. Harneti; N. N. Nurlelasari; R. R. Maharani; K. K. Haikal; U. U. Supratman; Y. Y. Shiono
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

Senyawa triterpenoid, 3-epicabraleahydroxylactone (1) telah diisolasi dari ekstrak n-heksana kulit batang Aglaia argentea. Struktur kimia senyawa 1 diidentifikasikan berdasarkan data-data spektroskopi dan perbandingan data spektra yang diperoleh sebelumnya. Senyawa triterpenoid, 3-epikabrraleahidroksilakton (1) dilaporkan pada tumbuhan ini untuk pertama kali.

ADSORPSI ANION Cr(VI) OLEH BATU PASIR TERAKTIVASI ASAM DAN TERSALUT Fe2O3 I. A. Gede Widihati
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (76.929 KB)

The research is about adsorption of three sand type (river, black beach, and white beach) wated with Fe2O3with and without H2SO4 activated Cr(VI) in water. The research covers the determination of surface acidity of sandby acid-base titration method, their specific surface area by blue methylene method, and of the adsorption,equilibrium adsorption isotherm, and adsorption capacities to Cr(VI) by atomic absorption spectrophotometer.The results indicate that activated white beach sand (AA2) has highest surface acidity (0.4741 mmole/g).The highest specific surface area is given by the sand control (A) (30.8969 m2/g), of beach sand is given by white tosand of AA2 (30.1203 m2/g). Adsorption capacity of sand on Cr(VI) increases with H2SO4 activation. Hignesscapacities is shown by the white beach sand of AA2 (1.0601 mg/g). Free energy adsorption (GoAds) on Cr(VI) ofwhite beach sand is -15.5053 kJ/mole indicating a weak chemical adsorption.

Page 6 of 52 | Total Record : 518

4 5 6 7 8

Filter by Year

2007 2024

Filter By Issues

All Issue Vol. 18, No.2, Juli 2024 Vol. 18, No.1, Januari 2024 Vol. 17, No.2, Juli 2023 Vol. 17, No.1, Januari 2023 Vol. 16, No.2, Juli 2022 Vol. 16, No.1, Januari 2022 Vol. 15, No.2, Juli 2021 Vol. 15, No.1, Januari 2021 Vol. 14, No. 2 Juli 2020 Vol.14 No.1 Januari 2020 Vol.13 No.2 Juli 2019 Vol.13 No.1 Januari 2019 Vol.12 No.2 Juli 2018 Vol. 12 No.1 Januari 2018 Vol. 11. No.2 Juli 2017 Vol. 11. No. 1 Januari 2017 Vol. 10, No. 2 Juli 2016 Vol. 10, No. 1 Januari 2016 Vol. 9, No. 2 Juli 2015 Vol. 9, no. 1 Januari 2015 Vol. 8, No. 2 Juli 2014 Vol. 8, No. 1 Januari 2014 Vol. 7, No. 2 Juli 2013 Vol. 7, No. 1 Januari 2013 Vol. 6, No. 2 Juli 2012 Vol. 6, No. 1 Januari 2012 Vol. 5, No. 2 Juli 2011 Vol. 5, No. 1 Januari 2011 Vol. 4, No. 2 Juli 2010 Vol. 4, No. 1 Januari 2010 Vol. 3, No. 2 Juli 2009 Vol. 3, No. 1 Januari 2009 Vol. 2, No. 2 Juli 2008 Vol. 2, No. 1 Januari 2008 Vol. 1, No. 2 Juli 2007 Vol. 1, No. 1 Januari 2007 More Issue

Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

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

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

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

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

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