CORRELATION OF LIGNIN STRUCTURE TO ITS ANTIOXIDANT ACTIVITY

M. Azadfar, A. Gao, Mahesh Bule, Shulin Chen
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Abstract

Abstract. The structure of lignin obtained after pretreatment of lignocellulosic biomass determines its use for producing value-added products. One attractive application of the lignin is for use as an antioxidant. In this study, the lignin obtained from ozone and soaking aqueous ammonia pretreatment of wheat straw was characterized in order to reveal its primary structural properties involved in antioxidant activity. The characterization results showed that specific esters bonds in wheat straw lignin such as -C I² -COO-arabinose and –CI³OO-C- were dissociated during the pretreatment, which resulted in a reduced molecular weight and selective release of derivatives from hydroxycinnamic acid such as ferulic acid and I-coumaric acid units. The combination of these factors led to the extracted lignin having a comparable antioxidant activity to that of the currently used industrial antioxidants. The percent inhibition effect was observed to be in the following order: guaiacol > butylated hydroxytoluene > ferulic acid > lignin (86.9±0.34).
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木质素结构与其抗氧化活性的关系
摘要木质纤维素生物质预处理后获得的木质素结构决定了其用于生产增值产品的用途。木质素的一个有吸引力的应用是用作抗氧化剂。本研究对小麦秸秆经臭氧和浸泡水氨预处理得到的木质素进行了表征,以揭示其参与抗氧化活性的主要结构性质。表征结果表明,在预处理过程中,麦草木质素中特定的酯键如-c - I²-co -阿拉伯糖和 - CI³o -c -被解离,导致羟基肉桂酸衍生物如阿威酸和I′-香豆酸单元选择性释放。这些因素的综合作用使提取的木质素具有与目前使用的工业抗氧化剂相当的抗氧化活性。抑菌率依次为愈创木酚、丁基羟基甲苯、阿魏酸、木质素(86.9±0.34)。
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