Physico-Chemical Studies of Hemicelluloses and Lignins

摘要

The theses is broken down into two parts. The first part discusses the properties of lignins and the second part is on the properties of hemicelluloses. Lignins are complex cross linked polymers of phenylproponoid units joined largely by benzylic, phenolic ether or carbon-carbon linkages. The present investigation has been carried out on different types of pulp materials being used in the region (NWFP) and on their effluents. Lignins have been isolated by various methods. Hemicelluloses are relatively low molecular weight polysaccharides and seldom possess more than 150 to 200 sugar residues in their molecular back bone. Hemicelluloses have been isolated from different types of materials such as sugarcane bagasse, wheat straw, kaigrass and paper industries effluents. Thin layer chromatography and ultraviolet techniques have been employed for the qualitative and quantitative studies of hemicelluloses.