Ester linkages between the carboxyl group in glucuronic acid and lignin in lignified plant cell walls have often been demonstrated by alkaline degradation or sodium borohydride reduction of acidic lignin-carbohydrate complexes (LCC).1~3) However, each of these methods has one serious disadvantage that the binding unit toward the glucuronic acid residue is indeterminate. In this article, we report a novel technique to obtain direct evidence for ester linkages between glucuronic acid and lignin by adopting selective cleavage of methoxybenzyl glucuronate with 2,3dichloro-5,6-dicyano-l ,4-benzoquinone (DDQ).
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Watanabe et al. (1988) studied this question.