Fungal α-amylase entrapped in agar-agar organic matrix “beads” enhances fabric starch-desizing potentials and α-amylase-detergent compatibility
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Date
2021-08-05
Journal Title
Journal ISSN
Volume Title
Publisher
Research Square
Abstract
Aureobasidium pullulans α-amylase (ApAmy) mixed with melted agar-agar solution and drop-wisely
added to a mixture of organic solvent solution allowed for the entrapment of the α-amylase in the agaragar
organic matrix as beads. The immobilized ApAmy’s characteristics and wash performance were
elucidated in comparison with the soluble ApAmy. Agar-agar at 2.0 % (w/v) and toluene: chloroform at
3:1 resulted in the highest immobilization yield retaining about 98% residual activity after ten catalytic
cycles. The optimum temperature and pH for the immobilized enzyme were 60ºC and 6.5 respectively.
The immobilized ApAmy hydrolysed branched and linear substrates thus establishing its broad substrate
specificity. Relatively, the immobilized ApAmy (iApAmy) was more tolerant to organic solvents than the
free enzyme. The iApAmy was mildly inhibited by cobalt but metals such as zinc, manganese, calcium
and sodium enhanced the free and immobilized ApAmy activity. The iApAmy had a higher washing
efficiency (77%) in the presence of detergents than the free enzyme (68%) and control (36%).
The iApAmy showed good potentials as a detergent additive and from its characteristics, it could be
useful in other industrial applications.
Description
Staff Publication
Keywords
α-amylase,, Aureobasidium pullulans,, agar-agar,, immobilization,, detergents