Abstract
A simple method for immobilization of amylase (Am) on montmorillonite (Mt) was developed. Direct immobilization of crude commercial Am was initially evaluated by size exclusion chromatography by considering Am peaks (in comparison to the pure enzyme from the same source), while the immobilized enzyme performance was monitored by anion exchange chromatography. The immobilized Am showed approximately 55.6 ± 0.7 % (n = 3) of the activity of the free enzyme. Both free and immobilized Am showed maximum performance in neutral pH (pH ∼ 7). The immobilized Am maintained more than 60 % of its initial activity after 10 reuse cycles. The immobilized enzyme was successfully applied for starch removal in crude carbohydrates extracted from medicinal plant samples.
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