ESTIMATION OF KINETIC PARAMETERS FOR RICE STARCH HYDROLYSIS INHIBITED BY ADDED MATERIALS

In the present study, glucose, maltose, and glycerol inhibition effects for alpha-amylase hydrolyzing rice starch were investigated. For the enzymatic hydrolyzsis of rice starch, α-amylase enzyme produced from Bacillus licheniformis was used. During the starch hydrolysis experiments, the temperature...

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Bibliographic Details
Published in:Chemical engineering communications 2007-03, Vol.194 (3), p.334-344
Main Authors: Apar, Dilek Kiliç, Özbek, Belma
Format: Article
Language:English
Subjects:
Alpha-amylase
Bacillus licheniformis
Hydrolysis
Inhibition kinetic
Oryza sativa
Rice starch
Stirred batch reactor
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Summary:In the present study, glucose, maltose, and glycerol inhibition effects for alpha-amylase hydrolyzing rice starch were investigated. For the enzymatic hydrolyzsis of rice starch, α-amylase enzyme produced from Bacillus licheniformis was used. During the starch hydrolysis experiments, the temperature and pH were kept constant at 60°C and 6.5 respectively. The reactions were carried out in 0.5 L of aqueous solutions containing 1, 2, 4, and 8% (w/v) rice starch. The amount of α-amylase enzyme added to this solution was 5 mL per liter (approximately 130500 units/L). The amounts of glucose, maltose, and glycerol added to the reaction solution were 4 and 8% (w/v), 4 and 8% (w/v), and 5 and 10% (v/v), respectively. An emprical model effectively simulated the data of residual starch concentration as a function of processing time for each condition. The Lineweaver-Burk plots showed that the inhibition effects of these added materials were uncompetitive.
ISSN:0098-6445
1563-5201
DOI:10.1080/15397730600830039