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NOOR HUBDRYAWATI
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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 8 Documents
 1 
Search results for , issue "Vol 9 No 2 (2012)" : 8 Documents clear
STUDI KOMPUTASI BERBASIS DFT TERHADAP FENOMENA QUANTUM TUNNELING DALAM ISOMERISASI METILHIDROKSIKARBENA Jumaidil Awal; Rahmat Gunawan; Eva Marliana
JURNAL KIMIA MULAWARMAN Vol 9 No 2 (2012)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Density functional theory-based methods have been applied to predict the most possible one among the isomerizations of methylhydroxycarbene considering the probability of hydrogen tunneling occurrence. B3LYP/6-31+G(d,p) and M08-SO/6-31+G(d,p) methods were applied in all computations using GAMESS-US software. There were three steps of computation in this research. First, electronic structure computations of both equilibrium and transition compounds involved in all isomerization alternatives in order to obtain the optimum structures of the compounds. Second, vibrational computations of optimum transition structures to ensure that each of the respective structures is well on its potential energy surface. Third, tunneling analysis accomplished by intrinsic reaction coordinate (IRC) computatuins for all isomerization alternatives followed by tunneling probabilitycalculation using the Wentzel-Kramers-Brillouin (WKB) formula for methylhydroxycarbene isomerizations. The result of this research showed that the DFT methods successfully produced the optimum structure of each compound. Both DFT methods also successfully mapped all the intrinsic reaction coordinates. B3LYP/6-31+G(d,p) method gave tunneling probabilities of 3.55 x 10-19 for the isomerization into acetaldehyde and 3.30 x 10-20 for that into vinyl alcohol. While M08-SO/6-31+G(d,p) method gave tunneling probabilities of 2.38 x 10-23 for the isomerization into acetaldehyde and 4.79 x 10-23 for that into vinyl alcohol.Keywords: DFT, methylhydroxycarbene, hydrogen tunneling, isomerization
PREDIKSI PUNCAK KEMATANGAN BUAH NAGA MELALUI PENGUKURAN GULA REDUKSI DENGAN METODE NELSON-SOMOGYI Alimuddin -
JURNAL KIMIA MULAWARMAN Vol 9 No 2 (2012)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Prediction of dragon fruit maturation peak by measuring reductor sugar with nelson-somogyi method have been done. Prediction was done by using three modes which are experimental result, regression model and first derivation. Age of the fruit which used in this research were 1, 3, 5 and 7 weeks old. Based on the result of this research can be concluded that maturation peak of dragon fruit happens at between 5 until 6 weeks old.Keywords: Dragon Fruit, Reductor Sugar and Nelson-Somogyi Method.
UJI HIPOGLIKEMIK EKSTRAK METANOL DAUN MAJAPAHIT (Crescentia Cujete (L.) TERHADAP KADAR GLUKOSA DARAH MENCIT JANTAN Erwin -; Chaerul Saleh; Tika Purwitasari
JURNAL KIMIA MULAWARMAN Vol 9 No 2 (2012)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Hypoglycemic test of methanol extract of Crescentia cujete (L.) at dose 25 mg/kg, 50 mg/kg and 75 mg/kg given to male laboratory mice orally with glucose tolerance test method has been done. Measurement of blood glucose was carried out every 30, 60, 90, 120, 150 and 180 minutes with glucometer. Result of this research concluded that addition of methanol extract of dose 25 mg/kg gave strongest hypoglycemic effect (25.20%), followed at dose 50 mg/kg (18.00%) and at close 75 mg/kg (10.01%) at confidence limit 0.05. Phytochemical test of methanol extract of Crescentia cujete (L.) leaves shown presence of alkaloids, terpenoids, phenolic and saponin compounds.Keywords: Hypoglycemic, Crescentia cujete (L.), phyatochemical
ADSORPSI FENOL OLEH ARANG AKTIF DARI AMPAS KOPI Nisa Hayatun Nufus Sunandar; Teguh Wirawan; Rahmat Gunawan
JURNAL KIMIA MULAWARMAN Vol 9 No 2 (2012)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

The comparison of phenol adsorption with activated carbon from coffee residue has been conducted. The first step in this study is coffee residue activation with ZnCl2 in 85oC during 7 hours. The coffee residue was dryed in 24 hours at 110oC and after that it was dissolved by activated carbon with 10% HCl and pH neutralized by using aquades 65oC. The activated carbon was determinate at pH 2-6, with time 15-60 minutes and phenol concentration 2-10 mg/L. From that result would be processed with isotherm Freundlich’s equation. The optimum conditions result obtained at pH 4, time 30 minutes and adsorption capacity of 1.733 mg/g. The activated carbon has been used into waste samples which have addition of phenol and obtained result 2.4751 mg/L from 6.4778 mg/L for waste water A. W. Sjahranie hospital and 0.0560 mg/L from 2.0068 mg/L for Karang Mumus River.Keywords: Phenol, adsorption, activated carbon, coffee residue
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
UJI FITOKIMIA DAN AKTIVITAS ANTIOKSIDAN DARI EKSTRAK ETANOL BIJI KELENGKENG (Euphoria Iongan STEUD) DENGAN METODE PERENDAMAN RADIKAL 2,2-DIPHENIL-1-PICRYLHIDRAZYL (DPPH) Husnul Chatimah; Chairul Saleh; Eva Marliana
JURNAL KIMIA MULAWARMAN Vol 9 No 2 (2012)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Kelengkeng fruit already well known for Indonesian society. Not only from the contents of the fruit, but Kelengkeng also have many other beneficial from the seed, leather, root and leaves that useful for human health. In this research, phytochemical and antioxidant activity test have been done. Antioxidant activity test was carried out with scavenging test to 2,2-diphenyl-1-picrylhidrazil (DPPH) radical. On antioxidant activity test, mix of extract and DPPH are incubated for 30 minutes at 37oC, then the absorbance measured at λ = 517 nm using spectrophotometer. The absorbance from sample, blank and negative control are converted as Antioxidant Activity Absorbance (AA%). Based on result of phytochemical etanol extract, Kelengkeng contains phenolic compounds. And based on antioxidant activity test with DPPH radical scavenging method by spectrophotometer, ethanol extract of Kelengkeng has antioxidant activity about EC50(72.23±2.55) while Vitamin C as comparison has antioxidant activity about EC50(6.07±0.36).Keywords: Kelengkeng, phytochemical, antioxidant activity and DPPH
VALIDASI METODE ANALISIS KADAR TIMBAL (Pb) DALAM MADU ALAM DI KALIMANTAN TIMUR Finqo Aprianto; Bohari Yusuf; Rahmat Gunawan
JURNAL KIMIA MULAWARMAN Vol 9 No 2 (2012)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Analysis method for determining Pb content in natural honey have been developed and validated. Research was done by analyzing one natural honey sample collected from Teritip (Balikpapan) with standard analysis method and three developed analysis method which their analytical performance tested later. Pb content was determined with atomic absorption spectrometry after dry digestion (method A) or wet digestion (method B (HNO3-H2O2; 3:8), C (HNO3-H2O2; 2:1) and D (HNO3)). Analytical performance parameter e. G. Linearity, working range, limit of detection, limit of quantitation, precision and accuracy were tested. Content of Pb in natural honey sample which analyzed with method A, B, C and D were found at 0.7923 ± 0.0311 µg/g, 0.7944 ± 0.0216 µg/g, 0.7998 ± 0.0218 µg/g and 0.7912 ± 0.0160 µg/g respectively. Analytical performance of four tested analytical method were still acceptable. Significance testing result showed that there were no significant differences in precision and accuracy between developed analysis method and standard analysis method, execpt for method D. Precision of method D was significantly better than standard analysis method.Keywords: Honey, Lead, Method Validation
ISOLASI DAN IDENTIFIKASI SENYAWA STEROID DARI KULIT BATANG TUMBUHAN ANDONG (Cordyline fructicosa [L] A. Cheval) Annisa Aisya; Ritson Purba; Saibun Sitorus
JURNAL KIMIA MULAWARMAN Vol 9 No 2 (2012)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

The isolation of steroid compounds from the bark of Andong plant (Cordyline fructicosa [L] A. Cheval) that come from Samarinda have been done. Their air-dried powdered from bark of Andong plant (Cordyline fructicosa [L] A. Cheval) (250 gram) were extracted by methanol at room temperature (27oC) and fractioned with n-hexane-water (1:1). Separation of steroid compounds in n-hexane fraction by column chromatography with silica gel 60 (35-70 mesh) based on the Isocratic method and produce six fractions, that fractions were 1, 2, 3, 4, 5 and 6 fractions. Fraction 3 gave a blue fluorescent staining that was observed after under UV light and with the Lieberman Burchard produces a green stain, then the fraction 3 was tested for steroid and produces a blue color indicates a positive steroid that has a yield of 0.0536 gram. Purification of the fraction 3 produces greenish-yellow crystals with Rf value of 0.72 with eluent chloroform (100%) while the value of Rf in n-hexane = 0.68 and Rf in ethyl acetate = 0.42. the UV-Vis spectrum of the crystalline isolate results provide absorption at wavelenght of 252 nm, 263 nm and 334 nm. While the result of FT-IR spectrum gives absorption at wave numbers: 689.63; 768.03; 800.79; 901.81; 977.32; 1052.32; 1201.45; 1273.35; 1358.76; 1463.11; 1662.32; 2853.02; 2926.19; 3056.42 and 3456.33. The bark of Andong plant (Cordyline fructicosa [L] A. Cheval) contains steroid compounds.Keywords: Andong (Cordyline fructicosa [L] A. Cheval), Steroid, Isocratic, Isolation

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