21 articles in this issue
Hari Sutrisno,Sunarto Sunarto
The polymorphic phases of titanium dioxide were successfully prepared by heat treatments of protonic lepidocrocite titanate, H0.54Ti1.8650.135O4?0.5H2O at various temperatures. The prepared powders were characterized with EDX (Energy Dispersive X-ray), Sc... see more
Didik Prasetyoko,Cholifah Endah Royani,Hamzah Fansuri,Zainab Ramli,Hadi Nur
Hydroxylation reaction of phenol into diphenol, such as hydroquinone and catechol, has a great role in many industrial applications. Phenol hydroxylation reaction can be carried out using Titanium Silicalite-1 (TS-1) as catalyst and H2O2 as an oxidant. TS... see more
Z.H. Tengku Faisal,Faisal Amri,Iqmal Tahir
Coconut shell (CS) is one of agro-waste material which has high natural lignocellulosics content. This material provides a potential resource as a reinforcement agent in thermoplastic elastomeric olefin (TEO). In this study, CS was used as filler in TEO c... see more
Ani Mulyasuryani,Anna Roosdiana,Arie Srihardyastutie
Potentiometric urea biosensor development is based on urea hydrolysis by urease resulted CO2. The biosensor is used chitosan membrane and the H3O+ electrode as a transducer. The research was studied of effecting pH and membrane thickness to the biosensor ... see more
Hermin Sulistyarti,Spas D. Kolev,Stephanie Lim
The importance of developing method for thiocyanate becomes obvious, because thiocyanate can inhibit iodine uptake of thyroid gland leading to mumps disease. In this work, thiocyanate is oxidized by permanganate in the acid donor stream to cyanide, which ... see more
Restu Kartiko Widi
Reaction kinetics for the oxidation of propane over diluted-leached MoVTeNb is described. This paper is focused on the study of products selectivity profile and determination of the orders of propane disappearance and propene formation. The result shows t... see more
Amaria Amaria,Suyono Suyono,Eko Sugiharto,Anis N Rohmah
Au(III) sorption by S. cerevisiae biomass extracted from beer waste industry was investigated. Experimentally, the sorption was conducted in batch method. This research involved five steps: 1) identification the functional groups present in the S. cerevis... see more
I Wayan Sutapa,Ria Armunanto,Karna Wijaya
The dissociative chemisorption of hydrogen on both pure and Sc-incorporated Mg(0001) surfaces have been studied by ab initio density functional theory (DFT) calculation. The calculated dissociation energy of hydrogen molecule on a pure Mg(0001) surface (1... see more
Edy Cahyono,Muchalal Muchalal,Triyono Triyono,Harno Dwi Pranowo
Kinetic in cyclisation-acetylation of (R)-(+)-citronellal with acetic anhydride was investigated over Zn2+-Natural zeolite (Zn2+-Natzeo) as a catalyst. (R)-(+)-citronellal has been isolated from citronella oil by fractional distillation under reducing pre... see more
Surya Hadi,Dina Asnawati,Novi Febrianti
The leaves of Voacanga foetida (Bl.) Rolfe, have been used ethnomedically for the treatment of wounds, itches, and swellings particularly in Lombok island. A phytochemical study has been done to investigate chemical compounds responsible against the cause... see more
Elvina Dhiaul Iftitah,M. Muchalal,Wega Trisunaryanti,Ria Armunanto
Two steps transformation of (+)-citronellal, cyclization and hydrogenation, on ZnBr2/?-Al2O3 and Ni/?-Al2O3 catalyst have been realized with the selectivity to cyclization products (isopulegols) was very high (yield up to ~92.58%) over ZnBr2/?-Al2O3 under... see more
Abdullah Abdullah,F Fadhillah,Supranto Supranto,A. Prasetya
Research on transesterification of crude palm oil (CPO) using petroleum benzin as solvent has been done. This research aims to determine the optimum concentration of catalyst KOH and NaOH, mole ratio of methanol to oil, volume ratio of solvent to oil, and... see more
Erwin Erwin,Alfian Noor,Nunuk Hariani Soekamto,Tjodi Harlim
Using data from UV, IR, 1H-NMR, 13C-NMR, dan NMR-2D analysis, a compound of 6,6'-dimethoxy-4,4'-dihydroxy-3',2'-furano-isoflavane (1) was successfully isolated from chloroform fraction of heartwood in Melochia umbellata (Houtt.) Stapf var. Degrabarata K (... see more
Rofiq Sunaryanto,Bambang Marwoto,Tun Tedja Irawadi,Zainal Alim Mas’ud,Liesbetini Hartoto
Purification and structure elucidation of antibiotic produced by marine actinomycetes (Streptomyces sp A11) was conducted. Production of antibiotic was carried out by liquid fermentation using yeast and peptone medium for 5 days fermentation. Purification... see more
Fitrya Fitrya,Lenny Anwar,Eliza Eliza,Muharni Muharni
A flavonoid compound was isolated from dried rihzomes of tunjuk langit (Helminthostachis zaylanica Lin), a traditional medicine from South Sumatera, Indonesia. Extraction was done by maceration methode and separation of isolated compound was conducted by ... see more
Hanapi Usman,Prastawa Budi,Ahyar Ahmad
A research on antibacterial bioactivity of protein fraction isolated from several species of sponges of Barang Lompo Island has been conducted. Pre-purification of protein using fractional method, showed maximum bioactivity with the inhibition zone of 26 ... see more
Heny Ekowati,Indwiani Astuti,Mustofa Mustofa
Calanone (coumarin derivate compound), isolated from Calophyllum sp. had been shown to have cytotoxic activity on leukemia L1210 cell line with IC50 = 59.40 mg/mL. Calanone presumed have anticancer activity on HeLa cervical carcinoma cell. This study was ... see more
Ahyar Ahmad,Harningsih Karim
Chromatin assembly factor-1 (CAF-1), a protein complex consisting of three subunits, p150, p60, and p48, is highly conserved from yeast to humans and facilitated nucleosome assembly of newly replicated DNA. The p48 subunit, CAF-1p48 (p48), with seven WD (... see more
Yohanes Buang
The effects of dietary adenine on growth, lipid secretion, and liver lipid contents were studied. Rats were paired-fed 0.25 % adenine diet or a diet without adenine for 10 days. The final body weight and relative liver weight were recorded. Serum lipid pr... see more
Hasnah Natsir,Abd. Rauf Patong,Maggy Thenawidjaja Suhartono,Ahyar Ahmad
Chitinase is an extracellular enzyme which is capable in hydrolyzing insoluble chitin to its oligomeric and monomeric components. The enzyme produced by thermophilic bacteria was screened and isolated from Sulili hot spring in Pinrang, South Sulawesi, Ind... see more
Yanni Sudiyani,Euis Hermiati
Lignocellulosic biomass is a potential alternative source of bioethanol for energy. The lignocellulosics are abundantly available in Indonesia. Most of them are wastes of agriculture, plantation and forestry. Among those wastes, oil palm empty fruit bunch... see more