Nonionic surfactants enhanced enzymatic hydrolysis of cellulose by reducing cellulase deactivation caused by shear force and air-liquid interface. (February 2018)

• Record Type: Journal Article
• Authors: Lou, Hongming; Zeng, Meijun; Hu, Qiaoyan; Cai, Cheng; Lin, Xuliang; Qiu, Xueqing; Yang, Dongjie; Pang, Yuxia
• Is Part Of: Bioresource technology. Volume 249(2018)
• Page Start: 1
• Page End: 8
• Publication Date: 2018-02
• Subjects: Nonionic surfactants -- Enzymatic hydrolysis -- Deactivation -- Shear force -- Air-liquid interface; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2017.07.066
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: High speed shearing would lead to cellulase deactivation. Nonionic surfactants could reduce shear deactivation of cellulase. The enhancement of nonionic surfactants is notable at high agitation rate. Abstract: Effects of nonionic surfactants on enzymatic hydrolysis of Avicel at different agitation rates and solid loadings and the mechanism were studied. Nonionic surfactants couldn't improve the enzymatic hydrolysis efficiency at 0 and 100 rpm but could enhance the enzymatic hydrolysis significantly at high agitation rate (200 and 250 rpm). Cellulase was easily deactivated at high agitation rate and the addition of nonionic surfactants can protect against the shear-induced deactivation, especially when the cellulase concentration was low. When 25 mg protein/L of cellulase solution was incubated at 200 rpm for 72 h, the enzyme activity increased from 36.0% to 89.5% by adding PEG4600. Moreover nonionic surfactants can compete with enzyme in air-liquid interface and reduce the amount of enzyme exposed in the air-liquid interface. The mechanism was proposed that nonionic surfactants could enhance the enzymatic hydrolysis of Avicel by reducing the cellulase deactivation caused by shear force and air-liquid interface.