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Photostabilization mechanisms of the main wood photostabilizers from the heartwood extract in Acacia confusa: okanin and melanoxetin

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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.

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Acknowledgements

The authors thank for the financial support (NSC 102-2313-B-002-023-MY3) from the Ministry of Science and Technology Taiwan. We also appreciate Assistant Research Fellow Min-Jay Chung (the Experimental Forest, National Taiwan University), Associate Professor Ting-Feng Yeh and Ms. Mao-Ju Chang (School of Forestry and Resource Conservation, National Taiwan University) for the supports of materials.

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  1. Tzu-Cheng Chang

    Present address: Department of Forestry and Natural Resources, National Ilan University, No.1, Section 1 Shennong Road, 260, Yilan City, Yilan County, Taiwan

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  1. School of Forestry and Resource Conservation, National Taiwan University, No. 1, Section 4 Roosevelt Road, 106, Taipei, Taiwan

    Tzu-Cheng Chang & Shang-Tzen Chang

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Chang, TC., Chang, ST. Photostabilization mechanisms of the main wood photostabilizers from the heartwood extract in Acacia confusa: okanin and melanoxetin. Wood Sci Technol 53, 335–348 (2019). https://doi.org/10.1007/s00226-019-01084-1

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