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NOOR HUBDRYAWATI
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INDONESIA
Jurnal Kimia Mulawarman
Published by Universitas Mulawarman
ISSN : 16935616     EISSN : 24769258     DOI : DOI: https://doi.org/10.30872/jkm
Core Subject : Science,
Chemistry
Journal of Kimia Mulawarman is a peer-reviewed, open access journal that publishes original research articles, review articles, as well as short communication in all areas of chemistry, including educational chemistry and applied chemistry.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 224 Documents
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PENENTUAN KLORAMFENIKOL DALAM DAGING AYAM BROILER DENGAN METODE HIGH PERFORMANCE LIQUID CHROMATOGRAPHY Aman Sentosa Panggabean
JURNAL KIMIA MULAWARMAN Vol 9 No 2 (2012)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Determination of chloramphenicol on broiler meat in traditional market by using High Performance Liquid Chromatography (HPLC) method has been done. The optimal of result determination to obtain, the HPLC system has been optimalized for the important parameters are composition of mobile phase, injection sample volume, flow rate and eluen pH. The result of research shown that the optimum conditions to obtain from the research are composition of mobile phase methanol:water (80:20), injection sample volume 5 µL, flow rate 0.5 mL/minute and eluent pH are 6 has been achieved. The analytical performance of method has been optimalized and gives good performance which shown with reproducibility of this method as coefficient of variation percentage (% CV) was 0.2198%, limit of detection was 0.1051 mg/L, and % recovery for the chicken meat sampel with 3 different samples > 95%. This result showed this method capable to application for the routine analysis of the determination chloramphenicol countent in samples.Keywords: Chloramphenicol, HPLC, Analytical performance, Broiler Meat
PEMANFAATAN ABU BATUBARA SEBAGAI ZEOLIT YANG TERDEALUMINASI DALAM MENGADSORPSI FENOL Agustinus Pata; Saibun Sitorus; Rahmat Gunawan
JURNAL KIMIA MULAWARMAN Vol 12 No 1 (2014)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

A research on the adsorption of phenol with zeolite adsorbent is formed from coal ash by hydrothermal process with the fusion method. In addition, the improvement in the ability of zeolite adsorbtion on the zeolite dealimination process is done. Phenol adsorption process is done through a batch shaker method with test parameters pH, contact time and adsorption capacity factor. The measurement results for the phenol optimum conditions were at pH 10 with a contact time of 30 minutes with the value of the phenol capacity of zeolite was 1,1853 mg/g were obtained using Langmuir isotherm adsorption equation.Keywords : Zeolite of coal ash, dealumination, adsorption, phenol.
SINTESIS SURFAKTAN TURUNAN AMIDA YANG DIPEROLEH DARI REKASI METIL RISINOLEAT DAN ETILENDIAMINA Daniel Tarigan; Magdaleni Rahayu Agustina; Soerja Kosenarpadi
JURNAL KIMIA MULAWARMAN Vol 15 No 2 (2018)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/jkm.v15i2.609

Abstract

Interesterification of castor oil with methanol using base catalyst gave mixture of fatty acid methyl esther (FAME) castor oil. Methyl risinoleate as major composition of methyl esther castor oil was subjected to column chromatography using petroleum ether:diethyl ether (19:1, v/v) as eluent, to give yield 73%. Amidation of methyl risinoleate with ethylendiamine under refluks condition using benzene as solvent for ± 12 hours and catalyst NaOCH3, gave 1,3–Dirisinoleil-Etilendiamida compound and 59% yield. The reactioned product 1,3–Dirisinoleil-Etilendiamida has been confirmed its structure using FT-IR spectroscopy, and Hidrofile Lipofile Balance (HLB) value was determined by titration method 12,56
ANALISIS RESIDU KLORPIRIFOS DALAM SAYUR-SAYURAN DENGAN TEKNIK HIGH PERFORMANCE LIQUID CHROMATOGRAPHY (HPLC) Aman Sentosa Panggabean
JURNAL KIMIA MULAWARMAN Vol 13 No 2 (2016)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

The research about analysis of chlorpyrifos residue in vegetables by using High Performance Liquid Chromatography (HPLC) technique has been done. To obtain the optimal measurement results, the measurement performed several important parameters in the chromatographic system was composition of mobile phase, volume injection sample, flow rate and pH eluent. Optimum measurement conditions obtained was mobile phase composition (water : methanol) with 70 : 30, volume injection sample are 5 mL, flow rate are 0.5mL/menit and pH eluent are 7. The analytical performance that obtained is good showed with the reproducibility value as percentage coefficient variance (% CV) was 0.0664%, limit of detection (LOD) was 0.44 ppm, with a recovery percentage of > 95%. The results obtained showed the HPLC technique can be used for the routine analysis in the determination of chlorpyrifos for the vegetable samples.
ANALISIS KANDUNGAN ASAM ASKORBAT DALAM BUAH NAGA MERAH (Hylocereus polyrhizus) DENGAN IODIMETRI Abdul Rahim; Alimuddin Alimuddin; Erwin erwin
JURNAL KIMIA MULAWARMAN Vol 14 No 1 (2016)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

ABSTRACT             The research to determine “Analysis the Content of Ascorbic Acid in the Red Dragon Fruit by Iodimetri” Vitamin C concentration of postharvest red dragon fruit (Hylocereus Polyrhizus) and at the same time to recognize those the packaging could affected conten of obtained Vitamin C. Analysis process was conducted by iodimetric titration method through the sample of dragon fruit with saving period and packaging varied. The result of completed research find out there was are difference concentration of Vitamin C between packaged dragon fruit and without package, the concentration of Vitamin C in packaged dragon fruit was increase the concentration of Vitamin C from the first day (11,1680 mg/100 gram of sample) to the third day (14,8017 mg/100 gram of sample) and decrease until the fifth day (10,4743 mg/gram of sample), otherwise by another treatment without package the concentration of Vitamin C are increase from the first day (7,4928 mg/100 gram of sample) to the sixth day (19,6784 mg/100 gram of sample) and decreased until the eighth day (14,1395 mg/100 gram of sample). Keywords  : Red dragon fruit (Hylocereus Polyrhizus), Vitamin C dan iodimetric titration.
Potensi Pemanfaatan Ekstrak Kubis Ungu (Brassica oleracea L.) sebagai Indikator Asam Basa Alami Erwin -; Muhammad Asfian Nur; Aman Sentosa Panggabean
JURNAL KIMIA MULAWARMAN Vol 13 No 1 (2015)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

The study of potential use of extracts and fractions of purple cabbage (Brassica oleracea L.) as an indicator of acid-base has been conducted. This research aims to determine the color change at a certain pH to extract total, n-hexane, ethyl acetate and methanol fraction. Based on the results of the test changes color only total extracts and methanol fraction that is suitable as indicator. Statistical test that the t test for total titration end point extracts, t calculate is smaller than t table [0.4241 <2.776], it showed no significant difference between the endpoint using the total extract with bromine thymol blue indicator. While the endpoint for methanol fraction having t calculategreater than t table [6.323> 2.776],indicating the end point of the titration using methanol fraction was significantly different compared with bromine thymol blue indicator.Keywords: Brassica oleracea L, indicator, and acid-base
DETEKSI DOPAMIN SECARA VOLTAMETRI MENGGUNAKAN ELEKTRODA PASTA KARBON TERMODIFIKASI ETER MAHKOTA (DIBENZO-18-CROWN-6) Irdawati Irdawati; Manuntun Manurung; Kadek Adi Septiawan
JURNAL KIMIA MULAWARMAN Vol 12 No 2 (2015)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

The research about the detection of dopamine by voltammetry method using crown ether modified carbon paste electrode has been carried out. The aims of this research are to investigate the influence of pH and the composition of modifier to the sensitivity and limit of detection for dopamine analysis. The measurement was conducted by differential pulse voltammetry method.The optimum of pH and modifier (crown ether) composition in the detection of dopamine are 4,0 and 0.8%, respectively. The linear concentration range is obtained from 10 to 200 µM, linear regression equation y = 4,968 + 0,068x with R2 = 0,9988 and limit of detection 6,865 x 10-6 M. The modified carbon paste electrode has relative standard deviation smaller than Horwitz’s (1,28%<5,66%), therefore this electrode has a good reproducibility. The recovery using crown ether-modified carbon paste electrode is 99,0% showing a good accuration. The measurement of commercial samples contain dopamine HCl (Giulini and Proinfark injection) is 87,0% and 91,5% compared with the composition on the label
Isolasi dan Identifikasi Senyawa Metabolit Sekunder dari Rimpang Temu Hitam (Curcuma aeruginosa Roxb) Yuwinda Cindy Elisabet Panggabean; Eva Marliana; Rita Hairani; Swandari Paramita; Sjarif Ismail
JURNAL KIMIA MULAWARMAN Vol 18 No 1 (2020)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/jkm.v18i1.807

Abstract

Isolation and identification of secondary metabolites from ethyl acetate fraction of rhizomes of Temu Hitam (Curcuma aeruginosa Roxb.) have been done. The separation of ethyl acetate fraction and further seperation were performed using gravity column chromatography with n-hexane and ethyl acetate (9.5:0.5-3:7) as solvent systems to obtain the isolate (oil;0.0216 g). Based on UV analysis of isolate, the result showed 1 peak at ? 206.14 nm. In addition, the FT-IR spectra indicated the presence of functional groups of OH, aliphatic C-H, C=O and C-O. According to the result of the UV and FT-IR spectra, the isolate can be identified as terpenoid.
STUDI AB INITIO GRAFIT BATUBARA SEBAGAI MATERI PENYIMPAN HIDROGEN Rahmat Gunawan; Melanie David; Hideaki Kasai; Muhammad A. Martoprawiro; Cynthia L. Radiman; Herman K. Dipojono
JURNAL KIMIA MULAWARMAN Vol 8 No 1 (2010)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Calculation of density functional theory (DFT) is carried out to investigate the adsorption of six molecules of H2 molecules on a graphite planar layer with a doping of alkali metal (Li, Na, and K). We reported that the DFT-GGA method, the presence of alkali metals on graphite, and H2-(GICs), have changed the interaction and the electronic system. We also reported that the ratio increased electron transfer from K to Na and Li. The calculation of the charge density shows that the increase in energy due to the transfer of electrical charge from GICs to six molecules of H2. This changes the electronic properties of graphite that are important in applications such as hydrogen storage.Keywords: Molecule Hydrogen, Graphite Intercalated Compounds, Density Functional Theory
PEMANFAATAN KARBON AKTIF DARI BATUBARA KOTOR (DIRTY COAL) SEBAGAI ADSORBEN ION LOGAM Cd 2+ DAN Pb 2+ DALAM LARUTAN Yogie Henry Payung; Saibun Sitorus; Alimuddin -
JURNAL KIMIA MULAWARMAN Vol 11 No 2 (2014)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

The research of activated carbon utilization of dirty coal as an adsorbent ion cadmium (Cd) and plumbum (Pb) has been done. In this research, the variations of solutions pH value (1, 2, 3, 4, 5 and 6), contact time (5, 10, 15, 30, 45, 60, 75 and 90 minutes), and the variation of concentration (20, 40, 60, 80 and 100 mg/L) were applied. The determination of cadmium and plumbum ion concentraction used an Atomic Absorption Specthrometer (AAS). The optimum condition cadmium ion on pH 4, than in the plumbum on pH 5 with optimum time contact is 15 minutes and the maximum adsorptive capacity cadmium ion in value is 2,90 mg/g, than on plumbum ion is 3,08 mg/g.Keywords: Adsorption, Activated Carbon, Dirty Coal, Cadmium, Plumbum, Ion, Solution

Page 12 of 23 | Total Record : 224

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