Bambang Setiaji

Universitas Gadjah Mada | UGM · Department of Chemistry

The research was done in Waenalut village, South Buru, Indonesia. In farming, Waenalut farmers applied sasi kelapa local wisdom which is a prohibition not to harvest coconut for certain period, generally for six months. Copra is the main products which made traditionally by smoking or asar. The research aimed to investigate the quality of copra mad...

Coconut ( Cocos nucifera L.) is common plant for the Moluccan farmers to apply local wisdom in cultivation, called sasi . This study describes sasi implementation of coconut cultivation in South Buru and its effects on the quality of the coconut harvest. The research was conducted by field observation and interviews. Data were obtained from coconut...

This study was carried out to analyze the suitability of the identification of four indigenous cellulose-producing acetic acid bacterial isolates (ANG29, KRE65, ANG32 and SAL53) based on the analysis of whole cellular protein profiles against identification based on phenotypic traits. Whole cellular protein profiles were determined by sodium dodecy...

Study on cytotoxicity of diarylaniline derivatives by using quantitative structure-activity relationship (QSAR) has been done. The structures and cytotoxicities of diarylaniline derivatives were obtained from the literature. Calculation of molecular and electronic parameters was conducted using Austin Model 1 (AM1), Parameterized Model 3 (PM3), Har...

‘Tall Type’ coconut plant is commonly grown by South Buru people in Moluccas province, Indonesia to support social and economic aspects. A part of Namrole people applied local wisdom called sasi kelapa, which was prohibition of picking coconuts in certain period of time. The objective of the research was to find out the age and the quality of the c...

Nanoencapsulated liquid smoke was made to enhance the physicochemical qualities, ease of handling and application of liquid smoke (LS) prepared from pyrolysis of coconut shells. A descriptive experiment was conducted to compare redistilled LS (sample F1), homogenised dispersion of nanoparticles (sample F2) and spray dried nanoencapsulated preparati...

Physicochemical properties of cellulose produced by local bacterial strain Gluconacetobacter xylinus KRE-65 by static and agitated fermentation methods was studied. Cellulose production by G. xylinus KRE-65 was carried out in coconut base medium with static and agitated fermentation methods. The dry weight, morphological and physicochemicalproperti...

Coconut presscake is a byproduct of processing VCO which has a relatively high protein content of 24.22%. Coconut presscake protein not fully utilized. Coconut presscake protein have functional properties that can affect the characteristics of food products. This study aims to determine the separation method of VCO which can produce protein isolate...

The study on the preparation and preparation of activated carbon from coconut shell charcoal via the combined chemical (ZnCl2) and physical (CO2) activations has been carried out. This study was aimed to study the chemical change occurred during the activation. The charcoal was immersed in the solution of ZnCl2, where the concentration of solution...

The aim of this research was to study the effect of stearic acid and TEA concentration on physical and chemical properties of cosmetic emulsion using coconut oil as raw material. The emulsion was made by emulsification of water phase (glycerin, aquadest and TEA) and oil phase (coconut oil, stearic acid, lanolin, cetyl alcohol). To determine the eff...

Physicochemical properties of bacterial cellulose produced by newly acetic acid bacterial strain Gluconacetobacter xylinus ANG-29 in different fermentation methods were compared using SEM and XRD techniques. Production of cellulose by G. xylinus ANG-29 with static fermentation method, shaking at 50 rpm, 100 rpm and 150 rpm were 1.59±0.08 g/100 ml,...

The effect of KOH stabilizer on mechanical and chemical properties of liquid rubber compound has been examined. Liquid rubber made by mixing stearic acid and zinc oxide as activator, 3,5-di-tert-butyl-4-hydroxy toluene and liquid smoke as antioxidant, CaCO3 as filler, dibenzothiazole disulfide and tetramethyl thiuram disulfide as accelerator, KOH a...

The effect of ZnO as activator on mechanical and chemical properties of liquid rubber compound has been examined. Liquid rubber made by mixing some chemicals such as stearic acid and Zinc Oxide as activator, BHT and liquid smoke as antioxidant, CaCO3as filler, MBTS and TMTD as accelerator, KOH as stabilizer and Sulphur as vulcanizing agent with con...

Identification of antibacterial compound of P. fluorecens and S. aureus from coconut shell liquid smoke (CS-LS) extracts completely has been done. CS-LS extraction was done by liquid-liquid partition in n-hexane, diethyl ether and nbutyl alcohol solvents. Identification of compound was done using Gas- Chromatography-Mass Spectroscopy (GC-MS), and a...

Study on anti-HIV activity of diarylaniline derivative compounds by using quantitative structure-activity relationship (QSAR) has been done. The compounds structure and their anti-HIV activities were obtained from literature. Molecular and electronic parameters were calculated by Austin Model 1 (AM1), Parameterized Model 3 (PM3), Hartree-Fock (HF),...

The study investigated the characteristics of chitosan-maltodextrin (CS-MD) nanoparticles incorporating coconut shell liquid smoke at various formulations. Chitosan-maltodextrin nanoparticles were prepared with the addition of 1.0% sodium tripolyphosphate (TPP) into a solution of liquid smoke. Sample consisting of CS-MD nanoparticles in 1.0% acetic...

The research was aimed at determining spray drying conditions during the production of smoke particulate powder and its consequences on the physical properties of the product. The experiment was carried out using a complete randomized factorial design. Samples were three solution of chitosan (CS)-maltodextrin (MD) based nanoparticles i.e. CS (0.5%...

The tar resulted from pyrolysis of coconut shell is a waste. It is important to be clarified their chemical composition and physical properties in order to find out their feasibility as source of a fuel. This research was resulted two immiscible organic fractions, and these were further determined their physical properties such as water composition...

Styrofoam has been undegreadable matter. When it’s been used as raw material of antishock packing made the problem of environmental issues. It’s meant to be a replacement for styrofoam and more degreadable. Cocodust is more degreadable due naturally than synthesized polymerization of styrofoam. Cocodust has been preparated for electronic and glassw...

Application of activated zeolite (ZAA) as molecular sieve to separate compounds of coal tar from vaccum fractional distillation, have been done. The size of zeolite was 10-20 mesh and used as solid phase in column chromatography with length of 30 cm. The first step of the research was coal pyrolisis and the product (tar) was distillated by fraction...

Determination of solvation structure of Ni2+ ion in water has been achieved using Monte Carlo method using canonic assemble (NVT constant). Simulation of a Ni2+ ion in 215 H2O molecules has been done under NVT condition (298.15 K). The results showed that number of H2O molecules surround Ni2+ ion were 8 molecules in first shell and 17 molecules in...

Pair potential function of Ni2+-H2O system has been constructed by ab initio method at UHF (Unrestricted Hartre-Fock) level. The basis sets used for energy interaction calculation were LANL2 Double-z ECP of Hay and Wadt for Ni2+ and Double-z Polarization of Dunning for H2O. Construction of pair potential function was done by collecting more than 30...

The computational chemistry calculation to determine the stabilization energy and ligand-ligand repulsion energies of [Co(NH3)n]2+ system was done by using LANL2DZ basis set for Co2+ and 6-31G* basis set for NH3 at the level theory of unrestricted Hartree-Fock (UHF). Result from the calculation shows that the larger number of NH3 ligand present in...

Catalysts with Ni and Pt as active metals in peleted zeolite were used for conversion of amyl alcohol, isoamyl alcohol and their mixture to hydrocarbon compounds. The catalysts were prepared by impregnation the peleted zeolite in NiCl2.6H2O and PtCI4 solution, while stirring for 24 hours then followed by oxidation with 02 gas at 350 °C for 2 hours...

Classical and quantum mechanical/molecular mechanical (QM/MM) molecular dynamics (MD) simulations have been performed to describe structural and dynamical properties of Co2+ in water. The most important region, the first hydration shell, was treated by ab initio quantum mechanics at unrestricted Hartree-Fock (UHF) level using the LANL2DZ ECP basis...

The activated carbon production from coconut shell with chemical and physical process has been done. This research was investigated the effect of soaking concentration of ammonium bicarbonate as the activator to the characteristics of product. It was also to study the application of activated carbon as an adsorbent in virgin coconut oil purificatio...

The solvation structure of Cu+ in water and in liquid ammonia has been investigated using the Metropolis Monte Carlo method. The systems consisting of one Cu+ in 215 solvent molecules have been simulated at a temperature of 240 K for ammonia and 298 K for water, respectively. Cu+−ammonia and Cu+−water pair potentials have been newly developed based...

Separation of coal tar process has been done by fractionation column using zeolite -Mn as stationary phase. Zeolite -Mn was produced with natural zeolite from Wonosari as raw material and was processes by ion exchange technique of Mn2+ to substitute the cation in the pore of zeolite. The zeolite was made in varying of particle size i.e. 20 - 28, 12...

Telah dilakukan kajian hubungan kuantitatif struktur-sifat antara temperatur transisi gelas (Tg) polimer turunan polietilen dengan sifat-sifat kimia fisikanya. Penelitian dilakukan melalui pemodelan terhadap trimer dari polimer- polimer tersebut dalam bentuk struktur sindiotatik dengan menggunakan perndekatan perhitungan semi empirik metode AM1 (Au...

Application of activated zeolite (ZAA) as molecular sieve to separate compounds of coal tar from vaccum fractional distillation, have been done. The size of zeolite was 10-20 mesh and used as solid phase in column chromatography with length of 30 cm. The first step of the research was coal pyrolisis and the product (tar) was distillated by fraction...