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Fractionated guaiacyl (G) and guaiacyl/syringyl (GS) DHPs prepared by continuous (Zutropf, ZT) and discontinuous (Zulauf, ZL) dehydrogenation schemes were subjected to quantitative 31 P NMR spectroscopy and their various hydroxyl groups determined. Two milled wood lignin samples from softwood and hardwood species were also examined. It was found that GS-DHPs resemble more GS milled...
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