STRUCTURAL STUDIES OF GUM-ARABIC, THE EXUDATE POLYSACCHARIDE FROM ACACIA-SENEGAL
STRUCTURAL STUDIES OF GUM-ARABIC, THE EXUDATE POLYSACCHARIDE FROM ACACIA-SENEGAL
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DOI：
10.1016/0008-6215(86)80018-0
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发表时间：
1986-08-01
影响因子：
3.1
通讯作者：
WONG, E
中科院分区：
文献类型：
--
作者：
DEFAYE, J;WONG, E
A 25.182-MHz 13 C-n.m.r.阿拉伯树胶的光谱允许所有C-1共振的明确表征。这些分配已被证实的相关性的修改后，这些信号的强度控制酸水解和释放的片段的表征。其他碳的共振已被分配通过部分放松的T1光谱的多糖通过分级降解的胶。这些结果表明，阿拉伯树胶主要由（1 → 20）-（10）- 3）-β- D-半乳聚糖核心与（1 →）6）-β- D-吡喃半乳糖基支链和α- L-阿拉伯呋喃糖基-（1 →3）-α- L-阿拉伯呋喃糖基和α- L-吡喃鼠李糖基-（1 →4）-β- D-吡喃葡萄糖基糖醛酸基团分别连接到分支单元的3位和6位。
A 25.182-MHz 13C-n.m.r. spectrum of gum arabic allows unambiguous characterisation of all the C-1 resonances. These assignments have been confirmed by correlation of the modification of the intensities of these signals after controlled acid hydrolysis and characterisation of the released fragments. The resonances of the other carbons have been assigned through partial relaxed T1 spectra of the polysaccharides obtained by graded degradation of the gum. These results indicate gum arabic to consist mainly of a (1 .fwdarw. 3)-.beta.-D-galactan core with (1 .fwdarw. 6)-.beta.-D-galactopyranosyl branches and with .alpha.-L-arabinofuranosyl-(1 .fwdarw. 3)-.alpha.-L-arabinofuranosyl and .alpha.-L-rhamnopyranosyl-(1 .fwdarw. 4)-.beta.-D-glucopyranosyluronic acid groups attached to positions 3 and 6, respectively, of the branch units.