STUDY ON MECHANISM AND HYDROLIZABILITY OF DCS SUBSTANCES IN PROCESS WATER BY PECTINASES
The efficiency and mechanism of two pectinases (pectate lyase (PGL) and alkaline pectinase (PL)) to hydrolyze model pectics and DCS (Dissolved and Colloidal Substances) of Masson pine BCTMP were evaluated. Both pectinases could effectively degrade the model pectics and DCS. The cationic demand (CD) values of model polygalacturonic acid and DCS could be reduced to about 20％ and 60％, respectively, by PGL. As for PL, the CD values of model pectin and DCS could also be reduced to about 20％ and 70％, respectively. However, due to the unmethylated form of pectic substances in DCS of BCTMP, PGL is more efficient than PL. The hydrolysis mechanism of polygalacturonic acid with PGL was investigated. The results showed that there was no need hydrolyzing the polymeric pectics to their monomers, since a minimum average DP (degree of polymerization) of 6.0 was required for pectic acid to interact strongly with cationic polymers and reduce the efficiency of the latter.
pectinase pectic substances DCS cationic demand hydrolysis
Zhang Chunhui Zhan Huaiyu Fu Shiyu Li Bingyun
State Key Laboratory of Pulp and Paper Engineering,South China University of Technology, Guangzhou,510640, China
国际会议
广州
英文
961-964
2010-11-08（万方平台首次上网日期，不代表论文的发表时间）