28 articles in this issue
Yatim Lailun Ni’mah,Lukman Atmaja,Hendro Juwono
High Density Polyethylene (HDPE) plastic plays an important role in various applications, for example, it can be used as a container (bottle). Petrokimia Kayaku Company, a branch of Petrokimia Company of Gresik, produces herbicides using HDPE plastic bott... see more
Abdul Rahman,Amri Ismail,Desi Jumbianti,Stella Magdalena,Hanggara Sudrajat
In this paper, we report a suitable method for extracellular synthesis of copper oxide nano particles by using Phormidium cyanobacterium. We hypothesize that synthesis of copper oxide nano particles is believed to occur by extracellular hydrolysis of the ... see more
Wega Trisunaryanti,Ignatius Emmanuel
Preparation, characterization, activation, deactivation, and regeneration tests of CoO-MoO/ZnO and CoO-MoO/ZnO-Activated Zeolite (AZ) catalysts for the hydrogen production using steam reforming of alcohols in fusel oil have been conducted. Both catalysts ... see more
Ahmad Budi Junaidi,Indriana Kartini,Bambang Rusdiarso
Study of chitosan prepared with chitin deacetylation by multistage alkali treatments has been done. Chitin was extracted from Lampung white shrimp's (Litophenaeus vannamei) shell. The FTIR spectroscopy was used to determine deacetylation degree of chitin/... see more
Sunardi Sunardi,Yateman Arryanto,Sutarno Sutarno
Adsorption of gibberellic acid (GA3) onto raw and purified kaolin from Tatakan, South Kalimantan was investigated in this study. Purification process was done by sedimentation to obtain relative pure kaolinite. Raw and purified kaolin samples were charact... see more
Hari Sutrisno,Endang Dwi Siswani
Pillaring layered tetratitanates anion by zirkonium(IV) polycation species has been realized by three steps: 1). cation-exchange of potasium tetratitanates, 2). intercalation of n-butylamine compound in layered hydrogen tetratitanates and 3). intercalatio... see more
Paulina Taba
Adsorption at various interfaces has attracted the attention of many scientists. This article discusses gas-solid and vapour-solid adsorption in CMK-1 and Norit SX22 using nitrogen, water and benzene as adsorbates. For comparison, MCM-48 used as template ... see more
Purwantiningsih Sugita,Bambang Srijanto,Budi Arifin,Ellin Vina Setyowati
The coating stability of ketoprofen by chitosan-guar gum gel has been studied. Into 228.6 mL of 1.75% (w/v) chitosan solution in 1% (v/v) acetic acid, 38.1 mL of guar gum (gg) solution was added with concentration variation of 0.35, 0.55, and 0.75% (w/v) ... see more
Afifah Rosyidah,Djulia Onggo,Khairurrijal Khairurrijal,Ismunandar Ismunandar
In recent years, the ferroelectric properties of aurivillius oxides have attracted interest and an extensive amount of work has been done toward the realization of their potential application in nonvolatile memories (FeRAM: ferroelectric random access mem... see more
Barlah Rumhayati,Chasan Bisri,Wahyu O. Fajarina
The uptake of orthophosphate onto the chitosan-ferrihydrite membrane has been studied. The membrane was proposed as a new binding layer of DGT technique. Membrane was prepared from a mixture of chitosan solution with ferrihydrite (FeOOH) paste and was cro... see more
Adhitasari Suratman,Hermann Waetzig
The protein separation was studied in capillary zone electrophoresis for preventing protein adsorption on the capillary wall. ß-lactoglobulin (pI: 4.83-5.4, Mr: 18.4 kDa), cytochrome c (pI: 9.59, Mr: 11.7 kDa) and ß-casein (pI: 4.6, Mr: 24 kDa) were used ... see more
Bambang Sri Kaloko
Successful commercialization of electric vehicles will require a confluence of technology, market, economic, and political factors that transform EVs into an attractive choice for consumers. The characteristics of the traction battery will play a critical... see more
Markus T. Lasut,Hardin F. Rares,Yoshiaki Yasuda
Production of methyl mercury (MeHg) has been shown in laboratory experiments using mercuric chloride (HgCl2) compound released into natural-collected sediments with different geochemical conditions. While the HgCl2 concentration was 30 µl of 113 ppm of Hg... see more
Zaenal Abidin,Sunardi Sunardi
Analysis of Yogyakarta air quality based on concentration of lead particulate using Fast Neutron Activation Analysis (FNAA) method has been done. The sample was taken 3 times in 16 strategic locations of Yogyakarta city using Hi-Vol air sampler that equip... see more
Yusthinus T. Male,Djulia Onggo,Muhamad A. Martoprawiro,Ismunandar Ismunandar
Quantum chemical studies have been carried out on the Fe(en)2(NCS)2 (en = ethylenediamine) complex both in low and high spin states (S = 0 and S = 2) using hybrid exchange-correlation functional (B3LYP) and non-hybrid method (BLYP). Calculations were perf... see more
Suryadi Budi Utomo,Jumina Jumina,Tutik Dwi Wahyuningsih
A research has been conducted to investigate the adsorption behavior of Pb(II) and Cr(III) onto polypropylcalix[4]arene polymer. The polypropylcalix[4]arene polymer was synthesized in the presence of H2SO4 catalyst and chloroform under N2 condition for 5 ... see more
Daniel Tarigan
Maltose has been partially acetylated from the reaction of melted maltose and acetic anhydride without solvent and catalyst to produce maltocyl acetate with the yield of 67%. Lauryc acid can be methanolized using H2SO4 as the catalyst to produce methyl la... see more
Iip Izul Falah
Carbaryl (1-naphthyl-N-methylcarbamate) and carbofuran (2,3-dihydro-2,2-dimethyl-7-benzofuranol-N-methylcarbamate) are very important N-methylcarbamate pesticides due to their high insecticide and nematocide effects, and widely used in vegetables plantati... see more
M. Taufik Ekaprasada,Hazli Nurdin,Sanusi Ibrahim,Dachriyanus Dachriyanus
An antioxidant compound has been isolated from the leaves of Toona sureni (Blume) Merr. The structure was determined to be methyl 3,4,5-trihydroxybenzoate (methyl gallate), based on UV-vis, FTIR, NMR and MS spectra. The isolated compound exhibited potent ... see more
Nurdin Saidi,A. Hamid A. Hadi,Khalijah Awang,Mat Ropi Mukhtar
Isolation, identification and characterization of the compounds isolated from the bark of Cryptocarya ferrea yielded three known aphorpine alkaloids. They are (-)-O-methylisopiline 1, (+)-norlirioferine 2 and (+)-lirioferine 3. Structural elucidation was ... see more
Puspa D.N. Lotulung,Sofa Fajriah,Andini Sundowo,Euis Filaila
The Flavanone compound with anti diabetic activity was isolated from ethyl acetate extract of Artocarpus communis leaves using column chromatography techniques. The structure of the flavanone compound was elucidated on the basic of spectroscopic evidence ... see more
S.M. Mizanur Rahman,Shayla Pervin,Md. Abdul Quader,M. Amzad Hossain
Two new compounds, normal alcohol containing of higher carbons and isomer of ß-sitosterol were isolated for the first time from the petroleum extract of the leaves of Lagerstroemia speciosa. The structure of the compound has been established on the basis ... see more
Thamrin Usman,Lucy Ariany,Winda Rahmalia,Romi Advant
Esterification of fatty acids from palm oil waste (sludge oil) as biodiesel liquid base has been done by using alum [Al2(SO4)3.14H2O] catalyst. Some reaction variables like reaction time, catalyst quantity, and molar ratio of sample-reactant was applied f... see more
Weny Musa,Hersanti Hersanti,Achmad Zainuddin,Roekmi-ati Tjokronegoro
The poriferasta-5.22E.25-trien-3ß-ol compound of leaves of this plant Clerodendrum paniculatum has activity as an inducer agent of plant systemic resistance of red plant toward Cucumber Mosaic Viruses (CMV), the inhibition activity compound shows 82% inhi... see more
Rizna Triana Dewi,Yulia Anita,Enade Perdana Istyastono,Akhmad Darmawan,Muhamad Hanafi
Interaction of sulochrin to active site of glucosidase enzyme of Termotoga maritime has been studied by employing docking method using Molecular Operating Environment (MOE), in comparison with those are reports of established inhibitor a-glucosidase such ... see more
Khairan Khairan,Umar A. Jenie,Retno S. Sudibyo
Semisynthesis of D6,7-Anhydroerythromycin-A was done by biomodification technique by addition of 0.2% INH into a culture fermentation of Saccharopolyspora erythraea ATCC 11635 in medium Hutchinson. The aim of this research is to studies of fragmentation p... see more
Aline Puspita Kusumadjaja,Tutuk Budiati,Ni Nyoman Tri Puspaningsih,Sajidan Sajidan
Phytase is enzyme which hydrolysis phytic acid to anorganic phosphate and myo-inositol pentakis-, tetrakis-, tris-, bis-, and monophosphate. The use of phytase in feed industry can overcome environment and nutrition problems which were arisen from unmetab... see more
Surya Hadi
Alstonia scholaris R. Br., (Apocynaceae) is widely distributed in Indonesia and in Lombok Island, the plant locally known as ";lolon nita"; has been used to treat malaria. To locate potential bioactive compounds, acid-base extraction was carried out. From... see more