Article Determination of Phenolic Hydroxyl Group Content of Milled Wood Lignins (MWL's) from Different Botanical Origins Using Selective Aminolysis, FTIR, 1H-NMR, and UV Spectroscopy was published on January 1, 1992 in the journal Holzforschung (volume 46, issue 5).
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Faix et al. (1992) studied this question.