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Jurnal Kimia Terapan Indonesia

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Published by Lembaga Ilmu Pengetahuan Indonesia

ISSN : 08532788 EISSN : 25277669 DOI : -

Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Materials Science & Nanotechnology

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Articles 9 Documents

Search results for , issue "Vol 5, No 1 (1995)" : 9 Documents clear

A LABORATORY STUDY OF FLUIDISED DRUM GRANULATION R. Sarwono
Jurnal Kimia Terapan Indonesia Vol 5, No 1 (1995)
Publisher : Research Center for Chemistry - LIPI

Performance study of laboratory scale Fluidised Drum Granulation (FDG) has been carried out using glass beads as model particles and melted wax as binder. The equipment was running well to coat the particle. The particle growth was simple, agglomerating or layering. Several process variables such as particle size, binder spray rate and amount of binder added, and drum speed were used to determine the unwanted agglomerate formation. The mass fraction of agglomerate formation increased sharply begin from initial particle size 3 mm to smaller. The transition size is 4 mm, there was virtually no agglomerate formation. Agglomerate formation also increased with' increasing binder spray rate, and varies little with drum speed and total amount of binder added.

PREPARASI CONTOH UNTUK ANALISIS ASAM AMINO OARI BERBAGAI BAHANBERPROTEIN Sumardi Sumardi
Jurnal Kimia Terapan Indonesia Vol 5, No 1 (1995)
Publisher : Research Center for Chemistry - LIPI

analysis results are discussed. The hydrolysis methods elaborated in this paper includes: (i) The use of 6N hydrochloric acid solution at 110 and 145°C for the analysis of most amino acids. (ii) The use of 6N hydrochloric acid solution after pre-hydro-lysis oxidation procedure using performic acid for methionine and cystine determination; (iii) The use of sodium hydroxide or barium hydroxide solutions for tryptophan determination. Both precision and accuracy of the analytical data resulted from the application of those hydrolysis methods are also discussed. It may be concluded that in order to be able to determine all of the amino acids in the sample, more than one hydrolysis procedure or sample preparation method have to be used.

PENGARUH KONVEKSI MOLEKUL TERHADAP DISTRIBUSI WAKTU TINGGAL Putut Irwan Pudjiono
Jurnal Kimia Terapan Indonesia Vol 5, No 1 (1995)
Publisher : Research Center for Chemistry - LIPI

Residence Time Distribution studies were performed in a continuous vertical Couette Flow device under the conditions of negligible molecular diffusion. Most of the experiments were carried out in the laminar flow region. Diethylene glycol (DEC, 'Analar grade', BDH, Poole) were used as the flowing fluid. 1% Congo red dye solution in DEC was used as the tracer and it was injected as an impulse input through the injection port situated at the bottom of the device. The temperature was maintained at 20°C during the course of the experiments. The responses were analyzed using the mixing cup technique. The C-curves obtained were analyzed theoretically using the equation originally derived for flow through annulus. Such an approach was applied since both Couette and annular flow device have similar geometry. The responses of the secondary flow induced by the cylinder rotation at Tas>Tac were expected to be observed as the curve change from the curve characterizes the laminar flow through annulus to normal distribution.

PROSES PEMBUATAN SERTA ANALISA BENTON-38 DARI BENTONIT SEBAGAI BAHAN ADITIF PADA CAT Tasrif Tasrif; Nuryatini Nuryatini; Siti Isnijah
Jurnal Kimia Terapan Indonesia Vol 5, No 1 (1995)
Publisher : Research Center for Chemistry - LIPI

The production of bentone for paint additive from Cabentonite was carried out by ion exchange process. The process has two steps, i.e. Ca++ ion in Ca-bentonite is exchanged by Na+ ion in saturated solution of NaCl to produce Na-bentonite. Then, Na+ ion in Na-bentonite is exchanged into {(R1)2N(R2)2 + by using alkyl quaternary ammonium salt to produce bentone. lnterms of swelling characteristic the ion exchange using 140 ml of saturated solution of NaCl for 100 g Ca-bentonite produced best product with a swelling characteristic of 15.56. The amount of dimethyl distearyl ammonium salt (DAM) used for production of bentone-38 was 60 g/100 g bentonite. This is based on the ion exchange capacity of bentone-38, i.e. 69 meq for 100 g bentonite. Swelling characteristics of the above bentone-TS-R (reference) and bentone-38-H (experiment) were 24.5 and 39 in Spirit Mineral Terplne (SMT), 55 and 54 in SMT + ethanol (17:3 v/v), and the viscosity of bentone-38-R, and bentone-38-H are 7.2 cps and 6.5 cps respectively.

STUDI TENTANG SPESIES LOGAM Ni DARI BEBERAPA KATALIS PREKURSOR Ni/SiO2 TERKALSINASI DENGAN TPR DAN XRD Achmad Hanafi Setiawan
Jurnal Kimia Terapan Indonesia Vol 5, No 1 (1995)
Publisher : Research Center for Chemistry - LIPI

Three different kinds of Ni-containlng species have been identified in calcined (673°K) Ni/SiO2 catalyst precursors according to their different reducibilities during temperature programmed reduction (TPR). Species A is attributed to an easily reduced species, corresponding to the bulk NiO with little interaction with the silica surface; species B is assigned to a less easily reduced form, due to small NiO particle attached to the silica surface; species C is ascribed to a very difficult to reduce species, reflecting to the strong NiO-silica surface interaction, Nickelhydrosilicate. Species A is obtained by either impregnation and ion exchanged methods, while species B and C are only produced by the ion echange method. The retained Na in the ion exchanged-NaOH catalyst affected a decreasing in the proportion of species A and a growth of the proportion of species C. The maximum value of intensity ratios of "d-spacing-XRD " of d2 and d3 in the reduced precursor Ni/SiO2 indicated the highest of catalyst activity.

PENGARUH CARA PENAMBAHAN ENZIM GLUKOAMILASE DAN ION LOGAM ALKALI DAN ALKALI TANAH PADA PROSES SAKARIFIKASI PATI SAGU A. T. Karossi; Agus Muchliawan; Linar Z.Udin; A. Sidik
Jurnal Kimia Terapan Indonesia Vol 5, No 1 (1995)
Publisher : Research Center for Chemistry - LIPI

Production of glucose syrup enzymatically employs both alpha-amylase and glucoamylase. Alpha amylase acts during liquifaction while glucoamylase in the saccharification process. In the present study the glucoamylase was obtained from Rhyzopus oryzae fermentation for five days using 4 liter scale LKB fermentor. The influence of single stage and multiple stage additions of glucoamylase on alpha amylase liquified sago starch indicated no significant difference on the saccharification. The presence of 0.2 - 0.8 mM Li+, Na+, K+, Mg++, Ca++ and-Bar+ salts enchanced the glucoamylase activity whereas at the level of 1 mM they acted as inhibitors. The results of HPLC analysis of the saccharification product showed that the glucoamylase hydrolysed 83.3% of the sago starch yielding free glucose.

LOW-TEMPERATURE SYNTHESIS OF LEAD ZIRCONATE TITANATE (PZT) POWDER FROM METAL ALKOXIDES Silvester Tursiloadi; Hiroaki Imai; Hiroshi Hirashima
Jurnal Kimia Terapan Indonesia Vol 5, No 1 (1995)
Publisher : Research Center for Chemistry - LIPI

PZT powder precipitate has been prepared by hydrolyzing a mixture of lead di-i-propoxide, zirconium tetra-n-butoxide and titanium tetrai-propoxide. The crystallization process of the amorphous PZT was studied by means of X-ray diffraction analysis. It was found that the powder precipitate was still amorphous on heating until 400°C for 2k As an intermediate product, metastable cubic Pb2Ti2O6 (pyrochlore phase) was found after heating at 450°C for 2h. In addition to Pb2Ti206 peaks, the diffraction peaks of perovskite PZT phase were observed after heating at 430°C for 24 h. After heating at 600 °C for 2h, only diffraction peaks of tetragonal perovskite PZT phase were found. The lattice parameters of the tetragonal PZT have been obtained to be a=4.066 A c=4.196 A This tetragonal perovskite phase was stable on heating until 1000 "C. The density of the compacted powder precipitate after heating at 1000°C (a relatively low temperature for the sintering of PZT) for 30 min. was 6.1 g/cm3, about 76% of the theoretical value.

PENAPISAN AKTIVITAS ANTIPROTOZOA DALAM BIJI SAGA (Adenanthera pavonina LINN) Lenny Sutedja
Jurnal Kimia Terapan Indonesia Vol 5, No 1 (1995)
Publisher : Research Center for Chemistry - LIPI

The protozoa Tetrahymena pyriformis GL is an eucaryote. Its metabolism is similar to that of mammalia, so that it is widely used as a biological tool in protein quality as well as toxicity assays. In the framework of searching toxic or antinutritive properties in saga seed (Adenanthera pavonina LINN), extracts of saga bean were tested for their antiprotozoa activity. The saga bean extracts were obtained after successive extraction with nhexane and ethanol. Observation of total and motile cell population indicated that 0,1% saga oil in the medium did not show significant effect on the growth of T.pyriformis GL during 96 hours incubation at 30°C. While ethanol extract of saga showed significant inhibition on the growth of T.pyriformis GL. Smaller cell population was already observed at 7 hours incubation at 30°C. At 24 hours incubation, 0,1% and 1% ethanol extract of saga in the medium showed 55,1% and 87,6% inhibition respectively. Ethanol extract showed the largest anttprotozoal activity compared to the other extract. Qualitative analysis indicated the presence of saponin and alkaloid in the ethanol extract of saga bean. Chromatographic analysis with high performance liquid chromatography showed the presence of at least eight components in the ethanol extract of saga.

RADIASI SINAR ULTRA VIOLET STRAIN ASPERGILLUS ORYZAE UNTUK MENINGKATKAN PRODUKSI ALFA AMILASE Yetti M.lskandar; Linar Z. Udin; A. T. Karossi
Jurnal Kimia Terapan Indonesia Vol 5, No 1 (1995)
Publisher : Research Center for Chemistry - LIPI

Mutation of Aspergillus oryzae was carried out by ultra violet irradiation at 254 nm. The mutans obtained with 0, 10, 20,30, 40 and 50 minutes irradiation were screened for their amylolytic activity and alpha amylase production. The latter was carried out by aerobic fermentation using sago (Metroxylon spy starch in shake flasks for five days at 30°C with orbital shake at 120 rpm. The observation indicated that the mutant resulted from 10 minute irradiation demonstrated a maximum alpha amylase activity of 1675 Unit/g protein at day-d. The amylase activity was assayed at 40°C for 30 minute incubation. The starch utilization was 87% and 3.84 g dry weight of biomass per L medium was produced. The specific activity of alpha amylase obtained from untreated parental strain was 1069 Unitlg protein. Starch consumption and biomass production was 80% and 3.62 g dry weight/ L medium, respectively. The increase of alpha amylase specific activity at 10 minute irradiation time was 56%.

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