31 articles in this issue
Katsutoshi Inoue
Pectic acid contained in some fruits like orange and apple is natural chelating polymeric material, exhibiting excellent adsorption behavior for some cationic metal ions including toxic heavy metals such as lead and copper. In addition, it also exhibits e... see more
Maming Maming,Jumina Jumina,Dwi Siswanta,Hardjono Sastrohamidjojo,Keisuke Ohto
The study on the transport behavior of Cr(III), Cd(II), Pb(II), and Ag(I) through bulk liquid membrane using p-tert-butylcalix[4]arene-tetradiethylacetamide as ions carrier has been conducted. The aims of this work are to determine the optimum condition, ... see more
Roto Roto,Iqmal Tahir,Umi Nur Sholikhah
Synthesis of Zn-Al-SO4 hydrotalcite and its application as anion exchanger for hexacyanoferrat (II) have been studied. Synthesis of Zn-Al-SO4 hydrotalcite was carried out by stoichiometric method and hydrothermal treatment. Sulphate in hydrotalcite interl... see more
Muzakky Muzakky
Prediction of adsorption model of Mn2+, Cd2+ and Hg2+ in water-sediment systems along Code River, Yogyakarta has been experimentally investigated. The aim of this investigation is to predict the transfer models based on isotherm adsorption of Mn2+, Cd2+ a... see more
Adlim Adlim,Mohamad Abu Bakar
Colloidal gold nanoparticles prepared by employing chitosan as the stabilizer in solvent of methanol-acetic acid solution were stable for months without precipitation. The mole ratio of chitosan-gold ions of 5:1 - 30:1 gave dispersed and fine gold particl... see more
Suharso Suharso
The kinetics of crystal growth of borax has been studied by using conductivity method at temperature of 25 °C and at various relative supersaturations. It was found that the growth rate increases with increasing supersaturation. At low concentration, grow... see more
Fitria Rahmawati,Sayekti Wahyuningsih,Nurani Handayani
Surface modification of graphite/TiO2 has been done by mean of Cu electrodeposition. This research aims to study the effect of Cu electrodeposition on photocatalytic enhancing of TiO2. Electrodeposition has been done using CuSO4 0,4 M as the electrolyte a... see more
Elida Purba
X-ray diffraction (XRD) is a powerful technique for the study of polymorphism and polymorphic phase transformations. Monitoring of phase transformation directly has been very limited to-date. The XRD system used in this study was used to determine the rat... see more
Wega Trisunaryanti,Suryo Purwono,Arista Putranto
Catalytic hydrocracking of waste lubricant oil into liquid fuel fraction using ZnO, Nb2O5, activated natural zeolite (ZAAH) and their modification has been investigated. The zeolite was produced in Wonosari, Yogyakarta. Activation of the zeolite was carri... see more
Tutik Setianingsih,Uswatun Hasanah,Darjito Darjito
Textile sludge waste contains many organic matters so that it is potential to be used as mesoporous carbon precursor. Actived carbon with mesopore character is effective as adsorbent and catalyst carrier of large molecules. Synthesis of the activated meso... see more
M. Amzad Hossain,S. M. Salehuddin
A more sensitive GC-MS method has been established for the determination of some carcinogenic polycyclic aromatic hydrocarbons (PAHs) in vehicles exhaust tar samples. The tar samples were extracted using dichloromethane (DMC): n-hexane solvent mixture. A ... see more
Erin Ryantin Gunawan,Dedy Suhendra
The lipase synthesis of wax esters using palm oil fractions (palm oil and palm kernel oil) and long chain alcohol as substrates was carried out. The present work focuses on the synthesis of wax esters using Lipozyme. Five parameters such as reaction time,... see more
Agustine Susilowati,Aspiyanto Aspiyanto,Hakiki Melanie,Yati Maryati
Preparation of vegetable broth from mung beans (Phaseolus radiatus L.) in semi pilot scale is an attempt development to get product of savory flavor in larger scale. The aim of this activity was to find out the effect of process multiplication on composit... see more
Sari Edi Cahyaningrum,Narsito Narsito,Sri Juari Santoso,Rudiana Agustini
In this study, papain was immobilized on chitosan with Mg(II) cosslinked agent. Studies on free and immobilized papain systems for determination of optimum pH, optimum temperatur, thermal stability and reusability were carried out. The results showed that... see more
Lestyo Wulandari
An accurate and sensitive HPLC method has been developed for the determination of mebhydroline napadisylate in the tablet. The Chromatography was performed on a reversed phase C-18 column, using a mobile phase of acetonitrile : ammonia 25% (80 : 20 v/v) a... see more
M. Amzad Hossain,S. M. Salehuddin,M. J. Kabir
Toxic normal hydrocarbon (NH), nonadecane in the methanolic extract of the whole of cabbage samples collected from different districts of Bangladesh was analyzed by GC-MS. It was observed that NH deposition on the samples takes place in different morpholo... see more
Hellna Tehubijuluw,Ismunandar Ismunandar
Determination of lattice energy, U, is an important work for ionic compounds, due to it is the driving force in the compounds formation. The objective this work are twofold, firstly to determine lattice energy of perovskite oxide using an approximate equa... see more
Herudi Kandau,Hanggara Sudrajat,Andreas Napitupulu,Syahrul Khairi,Zaky Al-Fatony,Herman Siagian
Hydrogen bonded neutral clusters of ammonia, (NH3)n (n = 2-6), have been theoretically investigated employing the D95++(d,p) (and wherever necessary, higher) basis sets at the Hartree-Fock (HF) level as well as with second-order Møller-Plesset (MP2) pertu... see more
Hanggara Sudrajat,Ria Armunanto
Molecular structures were optimized for the calix[4]arene by ab initio method at the Hartree-Fock level of theory using LANL2DZ and 6-311G basis sets. Conformational equilibrium of four calix[4]arene conformers are reported. The results are compared with ... see more
Paul Robert Martin Werfette,Ria Armunanto,Iqmal Tahir
Analysis of quantitative structure - activity relationship (QSAR) for a series of antimalarial compound artemisinin derivatives has been done using principal component regression. The descriptors for QSAR study were representation of electronic structure ... see more
Mohammed Hadi Al–Douh,Shafida Abd Hamid,Hasnah Osman
The reaction of o-vanillin A with benzyl bromide B2 in acetone as the solvent and K2CO3 as a base in the presence of tetra-n-butylammonium iodide (TBAI) as catalyst formed benzyl o-vanillin, C. The complete assignments of C using PROTON, APT, DEPT-135, CO... see more
Ida Bagus Putra Manuaba
In this study, triphenyltin benzoate was synthesized first, and followed by antitumor prescreening test of the compound towards a human cervical carcinoma cell line, HeLa. Three reaction steps were employed to obtain the compound needed, i.e. 1) synthesiz... see more
Maulidan Firdaus,Jumina Jumina,Chairil Anwar
A simple, energy-efficient, and relatively quick synthetic procedure for the synthesis of (1)-N-4'-methoxybenzyl-1,10-phenanthrolinium bromide, based on green chemistry principles has been carried out. The synthesis was started by solvent-free reduction o... see more
Tutik Murniasih,Kyoko Adachi
In our course of screening for secondary metabolite derived from marine bacterial, we isolate the antimicrobial compound collysmicin A from the ethyl acetate extract of Streptomyces sp Q-629K. Separation of this compound was carried out by silica gel open... see more
Tukiran Tukiran,Prima Ardhiana,Suyatno Suyatno,Kuniyoshi Shimizu
A long chain alcohol, 1-eicosanol together with two sterols, ß-sitosterol and stigmasterol had been isolated from hexane extract of stem bark of pacar cina (Aglaia odorata Lour) (Meliaceae). These structures had been established based on spectroscopic dat... see more
Yetti Mulyati Iskandar,Sri Priatni
Soybean fermentation was carried out by using mixed culture Rhizopus oligosporus C and Rhizopus oryzae L16 (1:1) as inoculum. Incubation places in an incubator at 30 oC for 5 days and assessment of ß-glucosidase activity daily was investigated. Isoflavone... see more
Antonius R.B. Ola,Bruce F. Bowden
(-) Z-Pinnatifidenyne, a novel C-15 acetogenin has been isolated along with the known compound (+)-3Z,6R,7R-obtusenyne and (+) (3Z)-laurenyne from the Australian red alga Chondria armata. The structures of the compounds were elucidated based on spectral d... see more
Ratna Agung Samsumaharto
A study was carried out to characterize the cocoa lipase from cocoa beans (Theobroma cacao, L.) of clone PBC 159. The optimum temperature of cocoa lipase was 30-40 °C and the pH optimum was 7.0-8.0. The moleculer weight of the lipase enzyme was in between... see more
Ahyar Ahmad
For better understanding of DNA replicating-coupled chromatin assembly and transcription regulation in eukaryotes, we studied biochemical and genetic analysis of nuclear-related proteins from chicken DT40 cell lines. The genetic analysis of some nuclear p... see more
S. M. Mizanur Rahman,Serajum Munira,M. Amzad Hossain
Two new compounds were identified as 2-ethyl-cyclohex-2-ene-6-hydroxy-methylene-1-carboxylic acid and 3b-hydroxy-lup-20(29)-en-28-oic acid, respectively, from the petroleum ether extracts of Cleome rutidosperma plant. These two constituents is the first t... see more
Sofnie M. Chairul
Isolation of carbamate coumpound from ethyl acetate extract of stem bark of Aglaia angustifolia (Meliaceae), was carried out. The dried stem bark of A. angustifolia was extracted with ethanol (polar solvent), ethyl acetate (medium of polar) and water. Fro... see more