Possibilities for recycling cellulases after use in cotton processing - Part 1: Effects of end-product inhibition, thermal and mechanical deactivation, and cellulase depletion by adsorption

• Type: Article in International Scientific Journal
• Date: 2002

Authors

Azevedo, H (Author) Other; Bishop, D (Author) Other; Cavaco Paulo, A (Author) Other

Journal

Title: Applied Biochemistry and Biotechnology

Vol. 101

Pages: 61-75

ISSN: 0273-2289

Publisher: Springer Nature

Indexing

ISI Web of Knowledge - 10 Citations

Scopus - 14 Citations

Other information

Authenticus ID: P-000-PR6

DOI: 10.1385/abab:101:1:61

Abstract (EN): Preliminary recycling experiments with cellulase enzymes after cotton treatments at 50degreesC showed that activity remaining in the treatment liquors was reduced by about 80% after five recycling steps. The potential problems of end-product inhibition, thermal and mechanical deactivation, and the loss of some components of the cellulase complex by preferential and or irreversible adsorption to cotton substrates were studied. End-product inhibition studies showed that the build-up of cellobiose and glucose would be expected to cause no more than 40% activity loss after five textile treatment cycles. Thermal and mechanical treatments of cellulases suggested that the enzymes start to be deactivated at 60degreesC and agitation levels similar to those used in textile processing did not cause significant enzyme deactivation. Analysis of cellulase solutions, by fast protein liquid chromatography, before and after adsorption on cotton fabrics, suggested that the cellobiohydrolase II (Cel6A) content of the cellulase complex was reduced, relative to the other components, by preferential adsorption. This would lead to a marked reduction in activity after several treatment cycles and top-up with pure cellobiohydrolase II would be necessary unless this component is easily recoverable from the treated fabric.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 15