Three unique polysaccharides (1-3) have been obtained from the 0.5 M NaOH extract of the stem of Cistanche deserticola Y. C. Ma. The results of methylation analysis, partial acid hydrolysis, 13C, 1H NMR, 1H-1H COSY, HMQC and HMBC spectroscopic analyses indicate that they are all composed of glucose, having a backbone of alpha-(1 --> 6)-glucan, and have different molecular weights. Their structures differ from that of linear starch.
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Wu et al. (2005) studied this question.
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