Physical and mechanical properties of microcrystalline cellulose prepared from agricultural residues

Microcrystalline cellulose (MCC) was prepared from local agricultural residues, namely, bagasse, rice straw, and cotton stalks bleached pulps. Hydrolysis of bleached pulps was carried out using hydrochloric or sulfuric acid to study the effect of the acid used on the properties of the produced microcrystalline cellulose such as degree of polymerization (DP), crystallinity index (CrI), crystallite size, bulk density, particle size, and thermal stability. The mechanical properties of tablets made from microcrystalline cellulose of different agricultural residues were tested and compared to a commercial-grade MCC. The use of rice straw pulp in different proportions as a source of silica to prepare silicified microcrystalline cellulose (SMCC) was investigated. The effect of the percent of rice straw added on the mechanical properties of tablets before and after wet granulation was studied. (c) 2006 Elsevier Ltd. All rights reserved.