19 articles in this issue
Roto Roto,Iqmal Tahir,Mustofa Mustofa
Zn-Al layered double hydroxide can be used as host material for UV active compound p-aminobenzoic acid (PABA), which is having capability to block UV light of sunlight. The formation of Zn-Al-PABA was best developed in which the nucleation process was don... see more
Suharso Suharso
An investigation of the effect of sodium dodecylbenzenesulfonic acid (SDBS) on both growth rate and morphology of borax crystal has been carried out. This experiment was carried out at temperature of 25 °C and relative supersaturation of 0.21 and 0.... see more
Hari Sutrisno,Endang Dwi Siswani
Intercalation of oligomeric chromium(III) polycation species in layered tetratitanates was prepared by three steps: 1) ion-exchange of H+ for K+ in potasium tetratitanates, 2) intercalation of n-alchylamine (n-propylamine, n-butylamine, n-amylamine, and n... see more
Winarti Andayani,Agustin Sumartono
Imobilization of titanium plate using titanium diisopropoxide as a precursor, that will be used as a catalyst for degradation of pentachlorophenol (PCP) has been done. In this study 10 ppm of pentachlorophenol (PCP) solution at pH 5 was used as a model of... see more
Uripto Trisno Santoso,Kamilia Mustikasaria,Sri Juari Santosa,Dwi Siswanta
Sensitization of fulvic acid (FA) on photoreduction of Cr(VI) to Cr(III) by TiO2 photocatalyst has been studied. Parameters influencing the sensitization, i.e., pH of medium, as well as FA concentrations, TiO2 concentrations and initial Cr(VI) concentrati... see more
E. Ristin Pujiindiyati,Wandowo Wandowo,Zainal Abidin
It has been done a determination of d 18O (SO42-) and d 18O (H2O) value from Jakarta deep groundwater with depth 40-140 m. The aim of this research is to know some procesess influencing the composition of oxygen isotope in groundwater sulphate. A method c... see more
Cahyorini Kusumawardani,Sukisman Purtadi,Crys Fajar Partana,Harno Dwi Pranowo,Mudasir Mudasir
A Monte Carlo simulation was performed for Co2+ in 18.6 % aqueous ammonia solution at a temperature of 293.16 K, using ab initio pair potentials and three-body potentials for Co-H2O-H2O, Co-NH3-NH3 and Co-H2O-NH3 interactions. The first solvation shell co... see more
Bambang Rusdiarso
Synergistic extraction of cobalt(II) with mixture of acyl-pyrazolon (HL) and crown-ether (E) in the Sr(NO3)2 environment has been studied. In this research, HPMBP (phenyl-1-methyl-3-benzoil-4-pyrazolon-5) was used, with three different kinds of crow... see more
Firdaus Firdaus,Jumina Jumina,Hardjono Sastrohamidjojo
Derivatization of 5,11,17,23-tetra-t-butyl-25,26,27,28-tetrahydroxycalix[4]-arene to 5,11,17,23-tetra-amino-25,26,27,28-tetrabutoxycalix[4]arene compound via etherification, ipso nitration, and reduction reactions, respectively has been conducted. The eth... see more
Bambang Purwono,Estiana E.P Daruningsih
The nucleophilic substitution reaction to quaternary Mannich base from vanillin has been investigated. Mannich reaction to vanillin was carried out by refluxing mixture of vanillin, formaldehyde and dimethyl amine. Quaternary ammonium halide salt was obta... see more
Nur Aini,Bambang Purwono,Iqmal Tahir
Structure Activity Relationship (SAR) technique between the theoretical parameters and antioxidant activities of isoeugenol, eugenol, vanillin and their derivatives as Mannich reaction products, have been analyzed. Antioxidant activities were examined by ... see more
I Made Sudarma
The aim of this research was to prove theoretical mechanism reaction on the sulfonation of papaverine alkaloid and the result could be used as a reference on the transformation of these alkaloid to the other derivatives. Theoriticaly sulfonation of papave... see more
Ruslin Hadanu,Sabirin Mastjeh,Mustofa Mustofa,Eti Nurwening Sholikhah,Mahardika Agus Wijayanti,Iqmal Tahir
Quantitative Electronic Structure-Activity Relationship (QSAR) analysis of a series of 1,10-phenanthroline derivatives as antiplasmodial compounds have been conducted using atomic net charges (q), dipole moment (µ) ELUMO, EHOMO, polarizability (a) and log... see more
Harno Dwi Pranowo,Iqmal Tahir,Ajidarma Widiatmoko
Electronic structure and inhibition activity relationship study of curcumin analogs has been established for 29 curcumin analogs on Ethoxyresorufin O-Dealkylation (EROD) reaction using atomic net charge descriptor based on AM1 semiempirical calculations. ... see more
Sri Atun,Retno Arianingrum,Sri Handayani,Rudyansah Rudyansah,Mary Garson
The objective of these research was measured activity as antioxidant some compounds in methanol extracts of peel of banana (Musa paradisiaca Linn.), isolated some compounds which had activities as antioxidant, and determined this structure. Method of this... see more
Pipin T. Kurniawati,H. Soetjipto,Leenawati Limantara
Research on Bixa orellana L. have been done to isolate, identify and determine bixin percentage, the antioxidant and antibacterial activities of bixin from B. orellana seed. Isolation and identification of bixin was done by thin layer chromatography... see more
Sugeng Riyanto
Five extracts were obtained from extraction of rhizomes of Zingiber amaricans. Hexane, dichloromethane and methanol extracts were obtained by maceration, while dichloromethane and acetone extracts the resulted of soxhlet extraction. By column chromatograp... see more
Ahyar Ahmad,Andi Syaiful,Firman AP Firman AP,Abdul Rauf Patong
Immobilization of glucose oxidase (GOD) enzyme from Penicillium sp-3 local strain has been carried out using ionotropically entrapping method in Ca-alginate membrane coupled with Na-polyacrilate. The entrapment of the enzyme in diffusion membrane oc... see more
Madalena Madalena,Heriyanto Heriyanto,Susanti Pudji Hastuti,Leenawaty Limantara
Cassava and ceara-rubber leaves are leavy vegetables that can not be consumed in raw form because they contained cyanide, therefore cooking process is needed to remove the cyanide. However cooking process cause the changes of the content of pi... see more