Identifier
etd-04102008-110648
Degree
Doctor of Philosophy (PhD)
Department
School of Nutrition and Food Sciences
Document Type
Dissertation
Abstract
Cellulose is the most abundant biopolymer in nature and is the major component of lignocellulosic biomass. It has potential to produce not only glucose but value¨Cadded products such as cellobiose and oligosaccharides. Typically, enzymatic hydrolysis of cellulose produces glucose and a small amount of cellobiose. Modification of cellulase solutions altered ratio of glucose to cellobiose produced. The addition of glucose oxidase, gluconolactone, or gluconic acid significantly increased the amount of cellobiose remaining at the end of cellulose hydrolysis. Addition of glucose oxidase resulted in cellobiose being 23.7% of the product sugars from pure cellulose and 14.1% from ligonocellulose (sugarcane bagasse). The presence of gluconolactone in the reaction mixture increased cellobiose to 31.3% of the sugars from cellulose and 15.8% from bagasse. The presence of gluconic acid changed the cellobiose to 21.9% of the sugars from cellulose and 13.2% from bagasse. In order to produce cellobio-oligosaccharides, a dextransucrase from Leuconostoc mesenteroides B-512FMCM was employed to catalyze the transglycosylation reaction between cellobiose and sucrose. The major cellobio-oligosaccharides were the trisaccharides, ¦Á-D-glucopyranosyl-(1¡ú2)-cellobiose and ¦Á-D-glucopyranosyl-(1¡ú6)-cellobiose. Cellobio-oligosaccharides have valuable functional properties as potential antifungal and anticariogenic agents, and an ¦Á-glucosidase inhibitor.
Date
2008
Document Availability at the Time of Submission
Secure the entire work for patent and/or proprietary purposes for a period of one year. Student has submitted appropriate documentation which states: During this period the copyright owner also agrees not to exercise her/his ownership rights, including public use in works, without prior authorization from LSU. At the end of the one year period, either we or LSU may request an automatic extension for one additional year. At the end of the one year secure period (or its extension, if such is requested), the work will be released for access worldwide.
Recommended Citation
Kim, Misook, "Enzymatic Production and Biological Activities of Cellobio-oligosaccharides from Lignocellulose" (2008). LSU Doctoral Dissertations. 1696.
https://repository.lsu.edu/gradschool_dissertations/1696
Committee Chair
Donal F. Day
DOI
10.31390/gradschool_dissertations.1696