Extraction and characterization of xylose-rich pectic polysaccharide from wheat straw

被引:9
作者
Sun, RC
Lawther, JM
Banks, WB
机构
[1] Univ Wales, BioComposites Ctr, Bangor LL57 2UW, Gwynedd, Wales
[2] Univ Wales, Sch Agr & Forest Sci, Bangor LL57 2UW, Gwynedd, Wales
关键词
xylose-rich pectic polysaccharide; pectin; wheat straw; sugars; lignin; FT-IR; phenolic acids and aldehydes;
D O I
10.1080/10236669808009722
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Xylose-rich pectic polysaccharide (XRPP) was extracted from defatted and protein-free wheat straw with a pH 1.6 solution adjusted with 20% hydrochloric acid. The yield of XRPP was 1.1% of the dried wheat straw. The isolated XRPP contained 44.8% galacturonic acid released by pectolyase treatment and 32.1% released by 2 N trifluoroacetic acid hydrolysis. The XRPP also contained 17.1% neutral sugars released by pectinase treatment and 28.4% released by acid hydrolysis. The major sugar components were found to be xylose and galactose. The weight-average molecular weight (M-w) of XRPP was about 8000 g/mol. The XRPP had low viscosity and low optical rotation as compared to citrus pectin. A comparison of the FT-IR spectroscopic data of citrus pectin and XRPP showed that the extracted XRPP belongs to pectic substances and differs from hemicelluloses with an intensive absorption band at 1740 cm(-1) The content of phenolic acid and aldehydes associated in the isolated XRPP, determined by alkaline nitrobenzene oxidation, was 1.10%.
引用
收藏
页码:345 / 356
页数:12
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