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Mahyudin A. Rahman
Pusat Pengkajian dan Penerapan Teknologi Bioindustri
Biochemistry, Genetics & Molecular Biology Health Professions Medicine & Pharmacology Public Health

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Karakterisasi Glukoamilase Hasil Produksi Aspergillus niger BCS dengan Penyangga Fermentasi Sekam dan Dedak Mahyudin A. Rahman; Koesnandar Koesnandar; Gany H.; Ahmad Marasabessy; Ali Rohman; Usman Sumo FT
JURNAL ILMU KEFARMASIAN INDONESIA Vol 2 No 2 (2004): JIFI
Publisher : Fakultas Farmasi Universitas Pancasila

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Abstract

Glucoamylase, the enzyme which converts starch to dextrins and glucose, is used in the starch-processing industry, especially for the production of glucose crystal and high fructose syrup. The aim of this work was to produce glucoamylase by Aspergillus niger BCS using rice husk as solid substrate support. For this purpose, rice husk added to the mixture was optimized on a fixed weight ratio of cassava starch and rice bran. After that, using optimum rice husk concentration, optimization of the weight ratio of cassava starch and rice bran was carried out. Glucoamylase A. niger produced in this work was characterized by determining its optimum pH and temperature, its stability under various pH and temperature, its kinetic parameters, its hydrolysis products using soluble starch as substrate, and its molecular weights. The optimum conditions for glucoamylase production by A. niger obtained when the weight ratio of cassava starch: rice bran was 1:1 (dry basis, db) and the rice husk concentration in the fermentation medium was 20% by weight (db). Under these optimized conditions, enzyme units as high as 1774 U/g dry fermented substrate was obtained when fermentation was carried out for 5 days at 30°C. Optimum pH of glucoamylase A. niger was 4.5 and its optimum temperature activity was 65°C. This enzyme was stable at pH 3.0 - 7.0 and at a temperature up to 50°C.
Pengaruh Penambahan Zat-zat Aditif pada Aktivitas Protease Bacillus megaterium DSM 319 Sumaryanto Sumaryanto; Deden RW; Mahyudin A. Rahman
JURNAL ILMU KEFARMASIAN INDONESIA Vol 2 No 2 (2004): JIFI
Publisher : Fakultas Farmasi Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (508.604 KB)

Abstract

Bacillus megaterium DSM 319 is a microbial neutral protease producer, which is usually used for food and non food (especially for dehairing and bating processes) industries. It was shown in this experiment, that the addition of some additive substances such as sodium benzoat, ammonium quarterner, calcium chloride and zeolite tested as a stabilizer of the ability for protease enzyme activities maintain comparing with control the application for the leather process was sign the difference performance. By using varian analysis and Duncan methode analysis at the 4 additif substances above from 0%, 0.5%, 1%, and 2% can be seen that the highest activity of protease reached at 0.862 U with sodium benzoat and the lowest activity at 0.636 U with zeolite.
Co-Authors Ahmad Marasabessy Ali Rohman Deden RW Gany H. Koesnandar Koesnandar Sumaryanto Sumaryanto Usman Sumo FT