Use of thermogravimetric analysis to monitor the effects of natural laccase mediators on flax pulp

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• 作者：Carlos Vila^a ; Agust&#xed ; n Garc&#xed ; a Barneto^b ; ^{agustin.garcia@diq.uhu.es"" rel=""nofollow} ; Amanda Fillat^a ; Teresa Vidal^a ; José ; Ariza^b
• 关键词：Laccase ; Flax pulp ; Thermogravimetric analysis ; Simulation ; Natural mediators
• 刊名：Bioresource Technology
• 出版年：2011
• 出版时间：June 2011
• 年：2011
• 卷：102
• 期：11
• 页码：6554-6561
• 全文大小：568 K

文摘

The effects of 1-hydroxybenzotriazole (HBT) and the natural laccase mediators gallic acid, caffeic acid and p-hydroxybenzoic acid, on the enzymatic bleaching of flax pulp were compared. The treatment was performed under atmospheric air and oxygen pressure, and, for the first time, monitored by thermogravimetric analysis (TGA) for comparison with chemical analysis, FTIR and X-ray diffraction (XRD) spectroscopies. Thermogravimetric data were simulated by applying a nucleation kinetic equation to a combustion model based on four pseudo-components (hemicellulose, amorphous and crystalline cellulose, and lignin). The results thus obtained show that the effects of the natural mediators are similar to those of HBT and lead to increased order in cellulose microfibril surfaces. An increase in pulp crystallinity was additionally exposed by the XRD and FTIR techniques, and a reduction in microfibril equatorial size by the XRD patterns. Simulated DTG curves were used to determine the kinetic parameters for thermal degradation.