异丁香酚脱氢聚合产物的合成及其抗氧化性能研究

doi:10.3969/j.issn.0253-2417.2018.01.013

Abstract

Abstract: The lignin dehydrogenation polymers (DHP) were prepared using lignin precursor isoeugenol as raw material and laccase as catalyst.The structure of DHP was characterized by FT-IR,¹³C NMR spectroscopy and GPC.The antioxidant activity of DHP was also studied by investigating the effect of the product on the half inhibitory concentration (IC₅₀) of diphenyl picrylhydrazyl radical (DPPH·) and on retarding the oxidation of β-carotene.The results showed that the structure of DHP was similar to the Ginkgo milled wood lignin (MWL).The ¹³C NMR spectrum showed that the typical lignin substructures such as β-5,β-O-4,β-1,β-β exist in the DHP.The content of free phenolic hydroxyl in DHP decreased with the increase of molecular weight.After classification,it was found that the ether-soluble fraction (DHP①) had the best antioxidant properties.The IC₅₀ value of this fraction was only 0.12 g/L.The increase of the volume or concentration of DHP could improve the ability of inhibition of oxidation of β-carotene.

Key words: lignin, dehyrogenation polymer, DPPH method, antioxidant property, β-carotene

CLC Number:

TQ35

CHEN Xuekuan, ZHAO Houkuan, WU Hongfei, YE Zhezi, XIE Yimin. Preparation and Antioxidant Properties of Dehydrogenation Polymer of Isoeugenol[J]. Chemistry and Industry of Forest Products, 2018, 38(1): 87-92.

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Preparation and Antioxidant Properties of Dehydrogenation Polymer of Isoeugenol

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