tailieunhanh - Waste Water Treatment and Reutilization 2011 Part 14

Tham khảo tài liệu 'waste water treatment and reutilization 2011 part 14', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 16 Low-Value Maize and Wheat By-Products as a Source of Ferulated Arabinoxylans Claudia Berlanga-Reyes1 Elizabeth Carvajal-Millan1 Guillermo Nino-Medina4 Agustín Rascón-Chu2 Benjamin Ramirez-Wong3 and Elisa Magana-Barajas3 Centro de Investigation en Alimentation y Desarrollo . Hermosillo Sonora Laboratorio de biopolímeros CTAOA 2Laboratorio de biotecnología. CTAOV 3Departamento de Investigación y Posgrado en Alimentos Universidad de Sonora 4Facultad de Agronomía Universidad Autónoma de Nuevo León i 2 3 4México 1. Introduction The major polymers in the cell walls are cellulose 25-35 hemicelluloses 40-50 and lignin 7-10 . Both cellulose and hemicelluloses function as structural supporting materials in the cell walls cellulose has a high tensile strength and gives rigidity to the walls whereas hemicelluloses impart elasticity to the structure by cross-linking cellulose micro fibrils Ishii 1997 . Xylans occur as the most common hemicelluloses and after cellulose they are the second most abundant polysaccharides in the plant kingdom. Arabinoxylans AX are hemicelluloses built up of pentose sugars mostly arabinose and xylose residues and are therefore often referred to as pentosans Izydorczyk Biliaderis 1995 . AX consist of backbone chains of P 1 4 linked-linked D-xylopyranosyl units to which aL arabinofuranosyl substituents are attached through O-2 and or O-3 Fincher Stone 1974 . Some of the arabinose residues are ester linked on O -5 to ferulic acid FA 3-methoxy 4 hydroxy cinnamic acid Smith Hartley 1983 . AX are mayor dietary fiber components of many cereals like wheat rye corn barley oat rice and sorghum Fincher Stone 1974 . AX are classified into water-extractable WEAX and water-unextractable AX WUAX . The WUAX present a combination of no covalent interactions and covalent bonds with other cell walls components such as proteins cellulose and lignin Andrewartha et al. 1979 . AX can be isolated by water and by alkali extraction Cui et al. 2001 . The extractability .

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