Apart from the 5–5′ couplings seen in the HSQC analysis, the formation of C5‐condensed phenolics is further supported by 31 P NMR spectroscopy for the cyclic extracted lignin samples (Figure 7 ), where an increasing trend is observed.
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Toward a Consolidated Lignin Biorefinery: Preserving the Lignin Structure through Additive-Free Protection Strategies.
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