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Lượt truy cập
 Lượt truy cập :  14,855,257

62.01

Công nghệ sinh học công nghiệp

Đỗ Hữu Nghị; Vũ Đình Giáp; Đỗ Hữu Chí; Trần Thị Như Hằng; Trần Thị Hồng Hà; Lê Mai Hương; Đỗ Hữu Nghị(1)

Cố định Cellulase từ nấm Trichoderma sp. trên hạt composit tạo bởi Chitosan và canh lanh hoạt hóa

Immobilization of cellulase from fungus Trichoderma sp. on composite beads of chitosan and activated kaolin

Khoa học và Công nghệ

2014

5

557-566

0866-708X

Cellulase; Trichoderma; Cố định enzyme; Hạt composit; Nghiên cứu

In the present study, the composite beads were successfully prepared using chitosan and activated kaolin, which had a diameter of approx. 4.5 mm and pore size of 10 - 50 um. Cellulase was purified from liquid-state cultivation of Trichoderma sp. by using ion-exchange (DEAEcellulose) and size-exclusion (Sephadex G 100) chromatography, and was afterward immobilized on the composite beads with the yield of 78.7 percent. The immobilization efficiency, stabilities of composite particle and immobilized enzyme as well as operational stability were evaluated. The pH - and thermal stabilities of immobilized enzyme were significantly higher than those of the free enzyme (remaining activity increased 35 percent as incubated at 60°C and 22 percent at pH 9.0). The immobilized enzyme has a reusability of at least 4 times. It remained more than 50 percent of its activity after 12 times of reuse.

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