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The Journal of Pure and Applied Chemistry Research
Published by Universitas Brawijaya
ISSN : 23024690     EISSN : 25410733     DOI : http://dx.doi.org/10.21776/ub.jpacr
Core Subject : Health, Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry Materials Science & Nanotechnology Medicine & Pharmacology
The Journal of Pure and Applied Chemistry Research focuses in publishing research articles in the field of Chemistry and Applied Chemistry. The target is in exploring, investigating, and developing chemicals sources from local and/or Indonesian to increase the value. Scope of the journal is organic chemistry, analytical chemistry, inorganic chemistry, biochemistry, and physical chemistry. Included the topic also organic chemistry natural product, theoretical and computational chemistry.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 263 Documents
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Practical Preparation of (4R,5R,E)-methyl 5-(tert-butyldimethylsilyloxy)-4-hydroxyhepta-2,6-dienoate Yudhi Dwi Kurniawan; Duen-Ren Hou; Rurini Retnowati
The Journal of Pure and Applied Chemistry Research Vol 3, No 1 (2014)
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (340.16 KB) | DOI: 10.21776/ub.jpacr.2014.003.01.164

Abstract

This study is aimed to improve the preparation of uselful synthetic block (4R,5R,E)-methyl 5-(tert-butyldimethylsilyloxy)-4-hydroxyhepta-2,6-dienoate (1). This intermediate was used in the synthesis of (+)-Cladospolide D. The strategy developed by Voigtritter et al. was adopted to exploit the acceleration effect of copper (I) iodide. This compound was prepared from D-mannitol-derived dienediol (2) coupled with methyl acrylate through olefin cross-metathesis reaction in various conditions. It was found that performing the reaction in the presence of 3 mol% of CuI in refluxing diethyl ether gave the product up to 75% of yield with lower catalyst loading, i.e.: 2 mol%.
Dilute Ionic Liquids Pretreatment of Palm Empty Bunch and Its Impact to Produce Bioethanol Lucy Arianie; Utin Dewi Pebriyana; Yudiansyah Yudiansyah; Nora Idiawati; Deana Wahyuningrum
The Journal of Pure and Applied Chemistry Research Vol 3, No 2 (2014)
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1355.056 KB)

Abstract

Ethanol production through ionic liquids pretreatment of palm empty bunch (PEB) was carried out. This research aims to investigate impact of ionic liquids synthetic i.e 1-butyl-3-methyl imidazoliumbromide or [BMIM]bromide toward cellulose’s palm empty bunch and convert its cellulose into bioethanol. Ionic liquid was synthesized  through reflux and microwave assisted synthesis methods. Research investigation showed that microwave assisted synthesis produce [BMIM]bromide 90% faster than reflux method. The characterization of synthesized product using FTIR, 1H-NMR, 13C-NMR and LC-MS showed that these reactions have been carried out successfully. Scanning electron microscope figure out changes morphological surface of palm empty bunch caused by ionic liquid pretreatment. Crystallinity index of PEB milled and cellulose of PEFB after [BMIM]bromide dissolution were identified using comparison of PEB FTIR spectrum. Cellulose without dilute [BMIM]bromide have higher LOI number than cellulose after [BMIM]bromide dissolution. It indicated that a large part of cellulose after dissolution has been changed into amorf. Hydrolysis residue of palm empty bunch hydrolyzed by sulfuric acids 5%, 100 0C for 5 hours and produce 685 ppm of reducing sugar. Simultaneous Saccharification and Fermentation using Trichoderma viride and Saccharomyce cerevisiae  for 5 days produce 0,69% of bioethanol.
Study of Structural Properties of Mesoporous Carbon From Fructose with Zinc Borosilicate Activator Tutik Setianingsih; Indriana Kartini; Yateman Arryanto
The Journal of Pure and Applied Chemistry Research Vol 3, No 3 (2014)
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (446.981 KB)

Abstract

Structural properties, including pore structure, functional group of carbon surface, and crystal structure of carbon built by zinc borosilicate (ZBS) and ZnCl2 (Z) have been investigated in this work. Physically, ZBS and ZnCl2 may act as template of carbon, whereas the Zn(II) cation act as chemical activator of carbonization. All precursors of ZBS (silicagel, boric acid, and ZnCl2) may act as catalysts of caramelization. The caramelization was conducted hydrothermally at 85oC and thermally 130oC. The carbonization was conducted at 450oC. The resulted carbons were washed by using HF 48% solution, 1M HCl solution, and aquadest respectively. The solid products were characterized by using nitrogen gas adsorption, infrared spectrophotometry, X-ray diffraction, and Transmition Electron Microscopy. Result of research showed that ZBS built larger mesopore volume, larger pore domination of pore size, more hydrophobic carbon, and more amorf than ZnCl2.
Study of Suspension Concentration Effect to The Electrical Resistance of Zinc Sulphophthalocyanine (ZnPcSn) Thin Film as Prototype of Ozone Detector Dhesy Galuh Ratnawati; Masruroh MASRUROH; Rachmat Triandi Tjahjanto
The Journal of Pure and Applied Chemistry Research Vol 3, No 2 (2014)
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (573.417 KB)

Abstract

We have studied the fabrication of zinc sulphophthalocyanine (ZnPcSn) thin film as prototype of ozone detector. The aim of this research is to find the relation between the electrical resistance of ZnPcSn thin film and the ZnPcSn suspension concentration. The thin film of ZnPcSn was deposited on Printed Circuit Board (PCB) substrate by using spin coating method, then, annealed at temperature of 100 oC. The resistance of ZnPcSn thin film was measured as it was exposed with ozone, synthesized from fresh air, for 60 min continuously. The electrical measurement was conducted twice for each point of data. The result of this research shows that the electrical resistance of ZnPcSn thin film decreases during the ozone exposure, and, it can be concluded that as the concentration of ZnPcSn suspension concentration increase, more amount of ozone can be adsorbed by thin film.
Extraction of Copper(I) Thiosulfate by Modified Chitosan Okky Anggraito; Akhmad Sabarudin; Ani Mulyasuryani
The Journal of Pure and Applied Chemistry Research Vol 3, No 2 (2014)
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (617.304 KB)

Abstract

Chitosan is one of non-toxic natural biopolymer and abundance in nature. Chitosan have two active sites such as amine and hydroxyl groups. Amine groups (-NH2) in chitosan can be modified into secondary amine (-NHR). In this research, copper was dissolved as copper(I) thiosulfate as anion complex (Cu(S2O3)23-) and chitosan was modified by trimethylamine sulfur trioxide (TMAS). One of hydrogen atom in –NH2 was substituted by –SO3Na. The result of this research, the modified chitosan was identified by FT-IR. FT-IR spectra gave characteristic band at 3600-3200 cm-1 (O-H and N-H); 1648 cm-1 (C=O); 1115,74 cm-1 (S=O) and 617,18 cm-1 (N-S). The result of surface analysis using SEM and TEM showed that the surface morphology of sulfated chitosan as a result of modification is different in comparison with chitosan. Based on chitosan, pH extraction was adjusted to pH 3 until 8. After optimum pH of extraction was obtained then re-extraction was done by using thiosulfate solution at 0.05 ; 0.10 ; 0.50 ; and 1.00 M. Extraction and re-extraction of copper(I) thiosulfate was analyzed by Atomic Absorption Spectrophotometer (AAS). The highest efficiency extraction using modified chitosan and chitosan respectively at pH 3 and 6. The efficiency re-extraction using modified chitosan and chitosan respectively 100% and below 100%.
Bimetallic Heteronuclear Complexes Bridged with Ferrichexathiocyanate-Synthesis, Characterization and Antibacterial Properties Mohammad Nasir Uddin; D A Chowdhury; Jashmin Akter
The Journal of Pure and Applied Chemistry Research Vol 3, No 3 (2014)
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (656.51 KB)

Abstract

A number of heterobinuclear thiocyanato-bridged complexes of cations, [M(NH2X)6]2+ and [M(en)3]2+ (where en= Ethylenediamine, X = H, Ph; M= Ni, Cu, Cd, Zn), with ferrichexathiocyanate have been prepared. The complexes have been characterized by FT-IR, 13C NMR and UV-vis spectroscopy, metal analysis, magnetic and conductance studies.  The composition complexes has been proposed on the basis of experimental and literature evidences. The antibacterial activity of the prepared complexes has also been investigated against the gram positive-Bacillus cereus and gram negative- Salmonella typhi and Escherichia coli pathogens.
Portable Solid Phase Extraction of Copper, Cadmium and Lead Using Analig ME-02 Chelating Resin and Their Determination by Atomic Absorption Spectrometry Mohamed Abousa Gaza; Lukman Hakim; Akhmad Sabarudin
The Journal of Pure and Applied Chemistry Research Vol 3, No 2 (2014)
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (369.44 KB)

Abstract

ABSTRACT The adsorption of metallic elements on the solid phase chelating resins is probably the most effective separation and preconcentration methods. In this work, portable Solid phase extraction (SPE) was constructed using a commercially available plastic syringe containing certain amount of the Analiq ME-02 chelating resin. The ability of this portable SPE was evaluated through adsorption-desorption process of copper, lead, and cadmium prior their determination by atomic absorption spectrometry (AAS). Some parameters affecting the adsorption-desorption of these heavy metal ions on the Analiq ME-02, which include effect of pH and concentration of eluent ((HNO3), were investigated in detail. It was found that quantitative adsorptions (> 90%) of copper, lead, and cadmium are obtained at all pHs (4-8) examined, whereas 1 M HNO3 was found to be effective for the desorption of these metals with the recoveries in the range of 93 -114%. Such results indicated that Analig ME-02 has excellent chelating ability (pH-independent) for the adsorption of copper, lead, and cadmium, while portable SPE system provides easiness and effectiveness for collection/preconcentation of metallic elements.
Determination of Hydroquinone in a Square Wave Voltammetry based on Screen Printed Carbon Electrode Alfita Safitri; Ani Mulyasuryani; Rachmat Triandi Tjahjanto
The Journal of Pure and Applied Chemistry Research Vol 4, No 1 (2015)
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (566.055 KB) | DOI: 10.21776/ub.jpacr.2015.004.01.187

Abstract

Hydroquinone is a phenolic compound are often used extensively in the cosmetics industry as whitening agent. This compound is very toxic and their use should be monitored. Due to the impact of hydroquinone, the use of hydroquinone restricted by BPOM (Food and Drug Regulatory Department in Indonesia) maximum by 0.02%. The aim of this study was to establish a new simple sensitive voltammetry method for determination of hydroquinone using screen printed carbon electrode (spce). In this study, linear concentration range, limit of detection, sensitivity and accuracy were investigated. Before the determination of parameters analysis, the method require the optimization of method parameters such as frequency and pulse height. This study were showed that the measurement of hydroquinone with square wave voltammetry method has linear concentration range 1 - 100µM, limit of detection 23.4µM, sensitivity 0.075µM/µA and accuracy 0.9969. The proposed method was succesfully applied in whitening cream cosmetic samples with good enough results.
Shortcut Approach to 1,4-Diazepine from 3-Pyridylnitrene Intermedietes under Mild Condition Siti Mariyah Ulfa; Hideki Okamoto; Kyosuke Satake
The Journal of Pure and Applied Chemistry Research Vol 3, No 3 (2014)
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (493.978 KB)

Abstract

The reaction of nitropyridine derivatives and tributylphosphine (Bu3P) with the existence of nucleophilic solvent gives ring expansion product as diazepines in medium yield. Reaction mechanism subjected the formation of phenylnitrene, followed by intramolecular electrophilic insertion reaction to pyridine ring and subsequent ring enlargement. The intermediate in the reaction confirmed by computational calculation using B3LYP/6-31G* level. The intramolecular insertion reaction of pyridylnitrene is considered suppressed by the low HOMO (-9.932 eV) energy level of pyridine ring compared to that of benzene (-9.653 eV), hence 1,4-diazepine is obtained when employed 3-nitro-2,6-lutidine as starting material. The formation of diazepines was confirmed by the analysis of 1H NMR data. Separation of the product mixture using column chromatography on SiO2 was carried out and found to give expected diazepine along with the reduction product.
Effect of beta-Carotene from Yellow Ambon Banana Peel on Rat Serum Retinol Level Suparmi Suparmi; Harka Prasetya; Martanto Martosupono; Lasmono Tri Sunaryanto
The Journal of Pure and Applied Chemistry Research Vol 3, No 2 (2014)
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (15.377 KB)

Abstract

Vitamin A Deficiency (VAD) is associated with significant morbidity and mortality from common childhood infections and is the world’s leading preventable cause of childhood blindness. Studies showed that carotenoid is one of the promissed vitamin A source. However the studies  on  carotenoid from yellow  banana peel and its potential as a natural source of vitamin A has not been widely reported. This study was conducted to measure the blood serum retinol levels of rats after administration of β-carotene from yellow ambon banana peel. This was an experimental study with post test only control group design, with sample size of 18 rats with age 1 month, devided into 3 groups. β-carotene dose administered based on the dose of red capsules vitamin A are (200,000 doses SI) for toddlers aged 12-59 months. Serum retinol levels were measured using a spectrophotometer according metide. This present study showed that the blood serum  level in group treated with  of β - carotene from yellow ambon banana peel (28.35 ± 1.61 mg/ dL ), was significantly different (p < 0.05) from that of   control group ( 22.08 ± 1.35 mg /dL ). β-carotene from yellow ambon banana peel are potential as provitamin A.

Page 4 of 27 | Total Record : 263

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