10 articles in this issue
Triyono Triyono
Arrhenius equation stated that reaction will proceed faster at higher temperature and with lower activation energy (Ea). Many literatures reported that preexponential factor (A) is constant for certain reaction and there is no relation between A and Ea. E... see more
Wega Trisunaryanti,Triyono Triyono,Mudasir Mudasir,Akhmad Syoufian
Multiple regression study of the influence of catalyst's characters with ?-Al2O3 as a support, including acidity, specific area, average pore volume, average pore radius, Ni content, and Mo content the hydrocracking conversion of asphaltene has been condu... see more
Uripto Trisno Santoso,Herdiansyah Herdiansyah,Wega Trisunaryanti,Sri Juari Santosa
The objective of this study is to develop a rate equation for reduction of Cr(VI) by humic acid (HA) using a continuum multicomponent model. HA was extracted from peat soil samples in Gambut Subdistrict, South Kalimantan. Parameters influencing the ... see more
Sutarno Sutarno,Yateman Arryanto
Faujasite was hydrothermally synthesized from fly ash at 100oC in alkaline solution by reflux with various concentration of HCl and fusion with NaOH (weight ratio of NaOH/fly ash = 1.2) pretreatments. Thermal stability of faujasite from fly ash was tested... see more
Karna Wijaya,Eko Sugiharto,Mudasir Mudasir,Iqmal Tahir,Ika Liawati
The synthesis and characterization of iron oxide-montmorillonite and its structural stability test with various concentration of sulfuric acid were conducted. Synthesis was performed by treating Na-montmorillonite clay with oligocations of iron, followed ... see more
Daryono Hadi Tjahjono,Amir Musadad,Septy Mariana K
A differential pulse polarographic method for a quantitative analysis of chloramphenicol residue in milk had been developed. Result showed that the method using dropping mercury electrode as working electrode, Ag/AgCl electrode as reference electrode, and... see more
Emma J Pongoh,Rymond J Rumampuk,Ponis Tarigan,Anthony J Herlt,Lewis N Mander
An antifeedant triterpenoid saponin has been isolated from the seed of Barringtonia asiatica and its structure elucidated mainly by two dimensional NMR spectroscopy is identified as 3-O-{[ß-D-galactopyranosyl(1?3)-ß-D-glucopyranosyl (1?2)]-ß-D-glucuronopy... see more
Hanoch J Sohilait,Hardjono Sastrohamidjojo,Sabirin Matsjeh,J Stuart Grossert
Synthesis of safryl ketone from safrole has been achieved through conversion of allyl group to secondary alcohol, followed by oxidation with PCC-Al2O3. The oxymecuration-demercuration reaction of safrole with HgSO4-NaBH4 yields safryl alcohol (66.38%) and... see more
Deni Pranowo,M Muchalal
Research on transesterification of soybean oil with sodium methoxide as the catalyst in methanol has been conducted. Yields of transesterification reaction were analyzed by gas chromatography-mass spectroscopy (GC-MS). GC-MS spectrum showed that mehtyl pa... see more
Yuliana Yuliana,Harno Dwi Pranowo,Jumina Jumina,Iqmal Tahir
Quantitative Electronic Structure Activity Relationship (QSAR) analysis of a series of benzalacetones has been investigated based on semi empirical PM3 calculation data using Principal Components Regression (PCR). Investigation has been done based on anti... see more