Assertion: lignin's group | /r/HasProperty | pew
Facets:
Source sentences:
text: The main chromophoric groups in native wood lignin are various kinds of ring-conjugated ethylenic groups, such as cinnamyl alcohol and cinnamaldehyde groups together with carbonyl groups, such as -carbonyl groups and quinones (Pew and Connors 1971; Imsgard et al. 1971; Hon and Glasser 1979; Gratzl 1985).