Thus the effective utilization of lignocellulosic

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Unformatted text preview: se the composition, the chemical structure and the organization of the biopolymers in lignocellulosic materials. Then, we will describe the optimization of the ethanol organosolv pretreatment of Miscanthus x giganteus; this perennial grass requires little nitrogen fertilizer or herbicide and can grow to over 3 meters tall per year to produce from 20 to 25 tons of dry matter per hectare. The optimized conditions permitted a good separation of hemicelluloses in a water soluble fraction and cellulose in the solid residue. This procedure also produces a large amount of a high -quality lignin which is relatively pure, primarily unaltered and less condensed than other pretreatment lignin. We will describe the impact of the treatments performed at different severities on the chemica l structure of the isolated lignin fragments by spectroscopic and chromatographic techniques. The results will be compared to those from milled wood lignin from the same feedstock. The results showed that an increase in the severity of the treatment enhanced the dehydration reactions on the side chain and the condensation of lignin, increased the concentration of phenol groups and decreased the molecular mass of lignin fragments. The resulting cellulose-rich material was evaluated by enzymatic hydrolysis an d fermentation for the production of ethanol and the organosolv lignin was used as lignin-based wood adhesives satisfying the requirements of relevant international standards for the manufacture of wood particleboard. KN-03 NATURAL PRODUCTS FROM SOME INDIGENOUS MEDICINAL PLANTS Wong Keng Chong School of Chemical Sciences, Universiti Sains Malaysia, 11800 Pulau Pinang, Malaysia E-mail: kcwong@usm.my Many plants growing in Malaysia are used in traditional medicine for the treatment of a variety of ailments but for most of them little is known abo ut their chemical constituents. This paper describes the isolation and structural elucidation of some novel as well as rare naturally -occurring compounds from a number of these plants. These natural products in clude t...
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This note was uploaded on 02/17/2011 for the course CHEMISTRY 101 taught by Professor Csr during the Spring '11 term at University of Louisville.

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