期刊
CARBOHYDRATE POLYMERS
卷 223, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2019.115127
关键词
Gleditsia sinensis Lam.; Galactomannan deposition; Mannose to galactose ratio; Solubility; Rheological properties
资金
- National Key R&D Program of China [2016YFD0600803]
- National Natural Science Foundation of China [31670579]
- Guangxi Key Laboratory of Chemistry Engineering of Forest Products [GXFC18-01]
- Specific research project of Guangxi for research bases and talents [AD18126005]
Pods from a Gleditsia sinensis Lam. tree were collected and the galactomannan content and other properties were determined at their different developmental stages. In green and immature seed, galactomannan was substituted to a great extent with a mannose to galactose (M/G) ratio of 2.4 from crude polysaccharides. During late galactomannan deposition, it was substituted to a lower extent and this ratio increased rapidly, reaching a M/G ratio of 3.1. Average molecular weight (M-w) of the extracted polysaccharides first increased, reached the maximum (1.19 x 10(6)) at 17 weeks after flowering (WAF), and then decreased. These changes might result from primary galactomannan biosynthesis and from galactose removal by alpha-galactosidase in the endosperm. The solubility of crude polysaccharides decreased with increased M/G ratio and maximum solubility was more than 89% that collected at 13 WAF. Rheological properties showed that apparent viscosity was largely influenced by the molecular weight and M/G ratio of galactomannans.
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