Photostabilization mechanisms of the main wood photostabilizers from the heartwood extract in Acacia confusa: okanin and melanoxetin
Journal
Wood Science and Technology
Journal Volume
53
Journal Issue
2
Pages
335-348
Date Issued
2019
Author(s)
Chang T.-C.
Abstract
Flavonoids are secondary metabolites with abilities to reduce the thermal- and photoinduced degradation of polymeric materials. Previous studies indicated that the flavonoids in Acacia confusa heartwood had photostabilities that can reduce the photoinduced degradation of lignin in wood. Hence, the photostabilities and the photostabilization mechanisms of major flavonoids in A. confusa heartwood merit further study. This study demonstrates that the flavone (7,3′,4′-trihydroxy-5-methoxyflavone), flavonols (melanoxetin and 7,8,3′-trihydroxy-3,4′-dimethoxyflavone) and chalcone (okanin) in A. confusa heartwood have good UV absorptivity, singlet oxygen quenching ability and phenoxyl radical scavenging ability, in particular, the two most abundant flavonoids, melanoxetin and okanin. Additionally, okanin can quench excited lignin. Accordingly, these flavonoids can remove hazards induced during lignin photodegradation.
SDGs
Type
journal article