It is demonstrated that the Wiesner reaction (detection of lignin with phloroglucinol/HCl) is due not only to cinnamic aldehyde but also to cinnamic alcohol units of the lignin. The limits of detection of some compounds related to lignin with phloroglucinol/HCl, naphthoresor-cinol/HCl and orcinol/HCl are determined. The chemistry of the reactions is discussed.
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Geiger et al. (1979) studied this question.
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