Novel thermodynamics of xylanase formation by a 2-deoxy-d-glucose resistant mutant of Thermomyces lanuginosus and its xylanase potential for biobleachability

Bioresource Technology
S A I BokhariFarooq Latif

Abstract

Production of xylanases by Thermomyces lanuginosus wild type and its deoxyglucose resistant mutant M7 on different substrates was investigated. The mutation conferred catabolite repression resistance as M7 supported xylanase production on glucose-based medium that was 8.8-fold higher than that of wild type. Product formation parameters were highest in media containing a combination of corncob and corn steep liquor. Among the soluble substrates, xylose was the best inducer. In the presence of glucose, the wild type produced 26 IU of xylanase per g of glucose while the xylanase yield of the mutant was 224 IU per g of glucose. Thermodynamic studies showed that M7 required lower Gibbs free energy, enthalpy and entropy for product formation than the wild type. In biobleaching studies an 18.6% decrease in kappa number and 2.63% increase in brightness for enzyme-treated pulp was observed. Moreover prebleaching with M7-derived enzyme resulted in a 27.3% reduction in chlorine demand as compared with that of 18.5% decrease when wild organism-derived enzyme was employed. These improvements indicate that the mutant-derived enzymes possessed a useful prebleaching potential and could be exploited for large-scale application.

Citations

Aug 26, 2014·Applied Biochemistry and Biotechnology·Nayeli Avila-CisnerosErnesto Favela-Torres
Jun 4, 2016·Brazilian Journal of Microbiology : [publication of the Brazilian Society for Microbiology]·Juliana Moço CorrêaRita de Cássia Garcia Simão
May 8, 2019·Biological Trace Element Research·Hamza RehmanSyed Ali Imran Bokhari

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