Structural characterization and conformational properties of a polysaccharide isolated from Dendrobium nobile Lindl.
文献类型： 外文期刊
作者： Zhang, Yi 1 ; Wang, Hongxin 1 ; Guo, Qingbin 5 ; Wang, Junqiao 6 ; Cui, Steve W. 4 ;
作者机构： 1.Jiangnan Univ, Sch Food Sci & Technol, State Key Lab Food Sci & Technol, Wuxi 214122, Jiangsu, Peoples R China
2.Shanghai Acad Agr Sci, Res Ctr Agr Prod Preservat & Proc, Shanghai 201403, Peoples R China
3.Jiangnan Univ, Natl Engn Res Ctr Funct Food, Wuxi 214122, Jiangsu, Peoples R China
4.Agr & Agri Food Canada, Guelph Res & Dev Ctr, 93 Stone Rd West, Guelph, ON N1G 5C9, Canada
5.Tianjin Univ Sci & Technol, Key Lab Food Nutr & Safety, Tianjin 300222, Peoples R China
6.Nanchang Univ, State Key Lab Food Sci & Technol, 235 Nanjing East Rd, Nanchang 330047, Jiangxi, Peoples R China
关键词： Dendrobium nobile Lindl.; Polysaccharide; Structure; Methylation analysis; NMR; Modelling
期刊名称：FOOD HYDROCOLLOIDS （ 影响因子：9.147； 五年影响因子：9.169 ）
ISSN： 0268-005X
年卷期： 2020 年 98 卷
页码：
收录情况： SCI
摘要： A water-soluble polysaccharide (JCP-40) from Dendrobium nobile Lindl. was extracted and purified. It was demonstrated as a single symmetrical peak based on HPSEC analysis and had an average molecular weight of 67.5 kDa. Combined with monosaccharide composition analysis, methylation analysis, 1D/2D NMR spectroscopy, the structural features of JCP-40 was proposed as follows: the major sugar residues of JCP-40 consisted of -> 4)-beta-D-Manp (1 -> and -> 4)-beta-D-Glcp (1 ->. Acetyl groups were found attached to the O-2 or O-3 positions on mannosyl residues based on NMR spectrum results. Rotational isomeric state (RIS)-Metropolis Monte Carlo method indicated that repeating unit increased from 30 to 120, the influence of Mw in this range affected chain flexibility. The conformational parameters (derived from R-g vs Mw and [eta] vs Mw) from HPSEC suggested a random coil conformation for JCP-40.
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