23 articles in this issue
Paulina Taba,Russell F. Howe,Graine Moran
The high use of surface-active agents (surfactants) by industry and households today leads to environmental pollution, therefore treatments are required to remove such substances from the environment. One of the important and widely used methods for remov... see more
Fakhili Gulo
A novel niobium oxychloride cluster compound, RbNb6Cl12O2 was obtained by solid state synthesis from stoichiometric mixture of RbCl, Nb2O5, NbCl5 and Nb powder, heated at 675 °C. Its structure was determined by single-crystal X-ray diffraction. It crystal... see more
Agus Abhi Purwoko
A number of arenetricarbonylchromium(0) complexes, [(?6-arene)Cr(CO)3], in which arene = benzene, chlorobenzene, phenyltrimethylsilane, and acenaphthene were synthesized. Electronic absorptions of these complexes were recorded in various solvents, ranging... see more
John Hendri,Irwan Ginting Suka,Wasinton Simanjuntak,Annisa Annisa,Gatot Gatot
In this study, high density polyethylene (PE) film (thickness 80 µm) was modified by grafting of acrylic acid (AA) onto the film using 15 kGy of g irradiation as initiator, applied at different exposure times. In addition to irradiation dose, other variab... see more
Irwan Ginting Suka,Wasinton Simanjuntak
This study was carried out to investigate the grafting of4-Vinyl Pyridine (4-VP) on silica prepared from rice husk, with the main aim to study wether the 4-VP grafted retains its characteristics. For this purpose, the grafted silica was analysed using FTI... see more
Rodiansono Rodiansono,Reda Ariyantie,Abdullah Abdullah
Preparation of a kaolin-hydroxyl chromium composite and characterization of its physico-chemical properties were conducted. The olygomer hydroxyl-chromium was prepared by adding Na2CO3 to 0.1 M chromium nitrate solution (ratio OH/Cr = 2) and then dried at... see more
Narsito Narsito,Sri Juari Santosa,Setya Lastuti
The kinetics of photo-reduction of manganese(IV) oxide, MnO2 in aqueous medium, in the presence of humic acid has been investigated, including the possibility for the involvement of such radicals in the reduction. Results showed that in aqueous medium, th... see more
Savitri Lodha,Abhilasha Jain,Mukesh Paliwal,Pinki B. Punjabi
The photocatalytic degradation has been considered to be an efficient process for degradation of organic pollutants, which are present in the effluents released by industries. The photocatalytic bleaching was carried out on rhodamin-B (cationic dye) in th... see more
Haryo Satriya Oktaviano,Wega Trisunaryanti
Cobalt and nickel based catalysts for ethanol steam reforming have been prepared. Preparation of Na-Ni-Mo/C, Na-Co-Mo/C, K-Ni-Mo/C and K-Co-Mo/C have been carried out using sol-gel method by applying citric acid as complexion agent and source for support ... see more
Triyono Triyono,Wega Trisunaryanti
Effect of cerium on hydrodesulfurization catalysts performance have been investigated. The catalysts were Pt or Pt-Ce supported on zeolite. The Pt/Zeolite catalyst was prepared by wet impregnation method, while that of Pt-Ce/Zeolite catalyst was prepared ... see more
M. Monajjemi,S. Afsharnezhad,M.R. Jaafari,S. Mirdamadi,H. Monajemi,S. Mollaamin
The effect of the polarity of the environment on the conformation zwitterionic membrane dilauroyl phosphatidylcholine (DLPC) has been investigated with calculation at the Hatree-Fock level using the 6-31G* basis set with Onsager continuum solvation model.... see more
Oman Zuas
Maming Maming,Jumina Jumina,Dwi Siswanta,Firdaus Firdaus,Hardjono Sastrohamidjojo
The study on transport of Cr(III), Cd(II), Pb(II), and Ag(I) through bulk liquid membrane using p-tert-butylcalix[4]arene-tetraethylester as ions carrier has been conducted. The aims of this work are to determine the optimum condition, efficiency, and sel... see more
I Wayan Sudiarta,Ni Putu Diantariani
Studies on biosorption and desorption of Cr(III) on algae (Eucheuma spinosum) adsorbent have been carried out. These studies included determination of biosorbent acidity, optimum pH, contact time of biosorption, isoterm and biosorption capacity, and mecha... see more
Erin Ryantin Gunawan,Dedy Suhendra
The synthesis of wax ester using refined, bleached and deodorized (RBD) palm kernel oil (PKO) and oley alcohol catalyzed by Lipozyme IM was carried out. Response surface methodology (RSM) based on a five-level, four-factor central composite rotatable desi... see more
Hanoch J. Sohilait
In these studies, Pyridinium chlorochromate-Alumina was used for oxidation of secondary alcohols (safryl alcohol and methyleugenyl alcohol) to ketone. The oxidation of safryl alcohol with PCC-Al2O3 followed by purification by potassium bisulfite yie... see more
Fauzia Anjum Chattha,Saeed Ahmed Nagra,Munawar Ali Munawar
A series of coumarins have been prepared by the Pechmann reaction of different phenols with ethyl acetoactate as well as malic acid using catalytic amount of sulfuric acid under microwave irradiation for few seconds.
Elfita Elfita,Supriyatna Supriyatna,Husen H. Bahti,Dachriyanus Dachriyanus
A diprenylated xanthone, 1,5-dihydroxy-3-methoxy-4,7-diprenylxanthone (1) had been isolated the first time from the dichloromethane extract of the stem bark of Garcinia griffithii, together with 1,7-dihydroxyxanthone (2) and polyisoprenylated benzophenone... see more
M. Amzad Hossain,Atiqur Rahman,Sun Chul Kang
Phytochemical investigations on the chloroform extract of the arial part of Orthosiphon stamineus resulted in isolation of one new prenylated compound 5,7-dimethoxy-3,4'-dihydroxy-3',8-di-C-prenylflavanone together with four known flavonoids compounds, si... see more
Ratna Agung Samsumaharto
Lipase (triacylglycerol acylhydrolase, EC 3.1.1.3) was extracted and purified from acetone dry powder of cocoa (Theobroma cacao. L.) of clone PBC 159 extract. The Lipase from AcDP of cocoa beans was used for purification using 40-60 and 60-80% ammon... see more
Hernawan Hernawan
Hibiscus radiatus Cuv calyces extracts rich in polyphenols was screened for their potential to inhibit oxidation of human low-density lipoproteins-cholesterol (LDL-C) in vitro. The inhibition of LDL-C oxidation (antioxidant activity) was determined by mea... see more
Andi Hairil Alimuddin,Masriani Masriani
Screening of antimicrobial activity compound from steam bark of Shorea foxworthyi Sym by Thin Layer Chromatography-Bioautography method have been conducted. The result of this research can be base in elucidation of antimicrobial activity compounds from S.... see more
Tri Joko Raharjo,Ariyani Setyo Widhiyati,Endah Mulya Asih,Sumiaty Sumiaty,Raden Tambunan,Ani Setyopratiwi
The role of phenolic compounds on antihypercholeserol activity of Virgin Coconut Oil (VCO) has been investigated. The in vivo studies ware carried out by treatment of two groups of Wistar white mouse (Ratus norvegicus) using high phenolic VCO and low phen... see more