HIGHLIGHTS
SUMMARY
Different different functional functional_groups groups and and possess possess industry Different types types of of lignin lignin contain contain different different molecular weights and elemental compositions. The functional_groups in lignin include include methoxy, methoxy, carbonyl, carbonyl, carboxyl, carboxyl, and hydroxyl groups groups linked linked to aromatic or or lignin and hydroxyl to aromatic aliphatic moieties in various amounts and proportions, leading to different lignin aliphatic moieties in various amounts and proportions, leading to different lignin composicompositions and structures. Four different approaches can be used to chemically modify lignin: synthesis of new chemically active_sites; lignin . . .
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