25 articles in this issue
Zipora Sembiring,Buhani Buhani,Suharso Suharso,Sumadi Sumadi
The research on the adsorption process of metal ions of Pb(II), Cu(II) and Cd(II) on Nannochloropsis sp biomass encapsulated by silica aquagel has successfully been done. The research was carried out in a series of experiments using batch method to obtain... see more
Is Fatimah,Narsito Narsito,Karna Wijaya
The effect of synthesis parameters to the physical properties of pillared saponite and pillared montmorillonite was examined. Mol ratio of Al to clay mass in the range 1.0 - 5.0 and two different calcination methods; conventional calcination and microwave... see more
Silvester Tursiloadi
A technique to determine the surface fractal dimension of mesoporous TiO2 using a dynamic flow adsorption instrument is described. Fractal dimension is an additional technique to characterize surface morphology. Surface fractal dimension, a quantitative ... see more
Erizal Erizal,Rahayu C Rahayu C
Interpenetrating networks (IPN) crosslinked polymer of polyvinyl alcohol (PVA) containing copolymer N-isopropylacryalmide (NIPAAm) were fabricated by radiation technique and characterized in terms of their aqueous swelling and critical behaviour. The infl... see more
Herry Poernomo
Characterization of fly ash nano particles as backfilled material candidate in the radioactive waste repository has been done. The objective of this research is to determine the permeability (K) and migration rate (Vr) of uranium in the backfilled materia... see more
Nuniek Herdyastuti,Tri Joko Raharjo,Mudasir Mudasir,Sabirin Matsjeh
Chitinase is enzyme that hydrolyzes chitin, a polimer of b-1,4-N-Acetilglucosamine which is the most abundant natural resource after cellulose. Chitinolytic microorganism can be found in environment like soil and water that contain chitin, or in ext... see more
Reni Subawati Kusumaningtyas,Leenawaty Limantara
Isomerization and oxidation have been known as the major factors of the degradation of carotenoid compounds. Results showed that the isomerization of the carotenoid in the oil palm fruit, during the sterilization process, promotes the decrease of the conc... see more
Luthfi Pratama,Yoeswono Yoeswono,Triyono Triyono,Iqmal Tahir
Biodiesel synthesis by transesterification reaction of coconut oil with methanol by using ash of palm empty fruit bunches (EFB) as base catalyst has been conducted. Sample of ash was prepared through heating, screening, reashing, and finally determining o... see more
Philiphi de Rozari
Lake Markermeer is a large fresh water lake in the centre of the Netherlands. Since Lake Markermeer is categorised as a shallow lake, it is very susceptible for sediment resuspension. The general objective of this study is to investigate sediment and nutr... see more
Lia Kusmita,Leenawaty Limantara
Chlorophyll is green pigment that can be found in plant chloroplast. Higher plants usually have two kinds of chlorophylls, chlorophyll a and b. These green pigments are easily degraded by temperature, light intensity, oxygen, acid, and water. Water causes... see more
Ermin K. Winarno,Winarti Andayani,Agustin Sumartono
The determination of methyl mercury content in green muscle (Mytilus viridis L.) that were taken from Pasar Pelelangan Ikan Muara Angke, Jakarta Bay has been carried out. Sampling was taken in November 2005 and March 2006, the samples were bought from the... see more
I Made Sudarma,Maria Ulfa,Sarkono Sarkono
The aim of this preliminary research was to synthesize derivatives of eugenol such as 4-allyl-2-methoxy-6-nitrophenol (2) and 4-allyl-2-methoxy-6-aminophenol (3). The result could be used as a reference on the transformation of eugenol to its derivatives.... see more
Jamaludin Al Anshori,Muchalal Muchalal,Sutarno Sutarno
Synthesis of menthol using Ni/?-Al2O3 15% has been carried out started from pulegol as precursor. Structure elucidation of the products was achieved by GC-FID, GC-MS, FTIR, and 1H-NMR evidences. Isomers identification and their stability were determined b... see more
Bambang Purwono,Catur Mahardiani
The synthesis of azo compounds from eugenol has been carried out by diazotation reaction. The diazonium salt was produced by reaction of aniline and sodium nitrite in acid condition at 0-5 °C temperature to yield benzenediazonium chloride salt. The salt w... see more
Galuh Widiyarti,Muhammad Hanafi,Wahyudi Priyono Soewarso
The monolaurin compound had been synthesized from lauric acid and glycerol by using sulfuric acid (H2SO4) as catalyst. The synthesis of monolaurin was done by batch esterification on the free solvent system. The esterification reaction was performed on th... see more
Venty Suryanti,Sri Hastuti,Tutik Dwi Wahyuningsih,Mudasir Mudasir,Dina Ika Muliawati
Optimization condition of the biosurfactants production by P. aeruginosa using soybean oil as substrate has been examined. The media containing 10% v/v of the soybean oil and 6 days of the fermentation time was the optimum condition for the biosurfactants... see more
Heriyanto Heriyanto,Suryasatriya Trihandaru,Leenawaty Limantara
Research on bacteriochlorophyll (BChl) a and its derivatives had been conducted to determine the coordination state and the aggregation process in acetone-water and methanol-water. The results showed that there were mainly two absorption peaks in BChl a a... see more
Agus Abhi Purwoko,Alistair J. Lees
A series of electronic spectral changes was observed when (arene)M(CO)3 complexes (where arene = benzene, chlorobenzene, phenyltrimethylsilane, acenaphthene, mesitylene, and M = Cr or W) were irradiated with 313 nm light in benzene solution at 298 K in th... see more
Hanggara Sudrajat,Danis Sriwijaya,Herman Siagian,Ria Armunanto
Ab initio calculations have been performed in order to investigate the conformational characteristics of p-(nitro)methoxycalix[4]arene and p-(tert-butyl)methoxycalix[4]arene. The structures of four types (cone, partial cone, 1,2-alternate and 1,3-alternat... see more
Enade Perdana Istyastono
Interaction of curcumin to dipeptydyl peptidase-4 (DPP-4) has been studied by employing docking method using Molecular Operating Environment (MOE) and AutoDock as the docking software applications. Although MOE can sample more conformational spaces that r... see more
M. Amzad Hossain,Zhari Ismail
This paper presents the studies performed on extraction of Orthosiphon stamineus, Benth by using different solvent for the identification and quantification of the caffeic acid derivatives such as caffeic acid and rosmarinic acid which confers to th... see more
Hendig Winarno,Ermin Katrin W
Isolation and elucidation of benzophenone glucoside from ethyl acetate extract of Phaleria macrocarpa bark and its inhibitory activity test against leukemia L1210 cell line have been done. The Phaleria macrocarpa bark were macerated using n-hexane, ethyl ... see more
Aliefman Hakim
Two prenylated flavones have been successfully isolated from the methanol extract of the heartwood Artocarpus scortechinii King. They were determined as artelastisin and artelastin. It has been reported that artelastisin and artelastin were obtained from ... see more
Sri Atun
Isolation and structure elucidation of some compounds from stem bark of Anisoptera marginata had been done. The isolation of those compounds was carried out by chromatographyc method and structure elucidation was performed by interpretation of spectroscop... see more
Lanny Hartanti,Henry Kurnia Setiawan
Cinnamic acid is one of known tyrosinase inhibitors. This study investigated the inhibition of tyrosinase activity of some cinnamic acid derivatives, i.e. 4-buthoxy-cinnamic acid, 4-n-butylcinnamic acid and 4-phenylcinnamic acid. Each inhibitor used in th... see more