الفهرس Only 14 pages are availabe for public view
 |  | from | 151 |  |  |
| | | from | 151 | | |
Abstract
Cellulosic materials are the most abundant renewable resource, they form with hemicellulose (non-cellulosic polysaccharide including glucans, mannans and xylans) the major constituents of plant cell walls. Cellulases enzyme are widely used in the bioconversion of waste cellulosic to compounds of economic importance such as glucose and cellobiose.
Generally, various treatments, changing the structure of the lignocellulosic materials or even simply affecting the lignin-hemicellulose cellulose (LHC) complex, alter its behaviour with respect to chemical or enzymic degradation.
The chemical hydrolysis of cellulose and lignocellulosic material can be carried out by means of different mild or concentrated solutions of acids or bases. The cellulose molecules are hydrolysed under the dilute acids into a simple pentoses and hexoses.
The objective of this work is to study the chemical and enzymatic hydrolysis of different raw cellulosic materials such as cotton linters, expelled fiber of maize, hollocellulose of expelled fiber of maize, bagasse, bagasse pith, rice straw, rice husk, corn maize and saw dust to glucose and cellobiose. These final products used as carbon source in fermentation medium syrup which they are more easily consumed by microorganisms.
In this study the most efficient fungal isolate was found to be belong to Aspergillus ochrceous. This organism was chosen as the experimental organism in the subsequent studied because of its highest potentiality as cellulosic organism.
The applied field of this study was summerized in enzymatic hydrolysis at time intervals of cellulose as standard sources. These obtained results will be compared with solubilization of cellulases enzyme for different carbon sources.
In this study, we focused on the highest rate of enzyme production to obtain the highest reducing sugar contents at the lowest hydrolysis time.