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首页> 外文期刊>RSC Advances >Acetic acid lignins from Chinese quince fruit (Chaenomeles sinensis): effect of pretreatment on their structural features and antioxidant activities
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Acetic acid lignins from Chinese quince fruit (Chaenomeles sinensis): effect of pretreatment on their structural features and antioxidant activities

机译：木瓜果实中的乙酸木质素：预处理对其结构特征和抗氧化活性的影响

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摘要

In this study, three pretreatment processes were evaluated for their effects on the structural features and antioxidant activities of lignins extracted by the acetosolv process from the fruit of Chinese quince. The three pretreatments included dephenolization, sugar removal, and multiple processes (a combination of both dephenolization and sugar removal). The results showed that after sugar removal pretreatment, the carbohydrate content, the molecular weight and S/G value of the lignin fractions decreased. However, after dephenolization pretreatment, the carbohydrate content and the molecular weight of the lignin fractions increased. After sugar removal and dephenolization, there were increases in the temperatures corresponding to the maximal rate of decomposition (DTG _(max) ) in all lignin fractions. The radical scavenging index of lignin after sugar removal pretreatment was higher compared to other pretreatments and no treatment. The results of these tests showed that sugar removal, as a pretreatment, enhanced lignin extraction, yielding pure and highly functional lignins. Additionally, dephenolization or multiple process were beneficial to the acquisition of macromolecular lignins. All the results provided references for the biorefinery of biomass rich in polyphenol and sugar compounds.
机译：在这项研究中，评估了三种预处理工艺对木瓜果实中乙酰丙酮法提取的木质素的结构特征和抗氧化活性的影响。这三种预处理包括脱酚，除糖和多个过程（脱酚和除糖的组合）。结果表明，除糖预处理后，木质素组分的碳水化合物含量，分子量和S / G值均降低。然而，在脱酚预处理之后，木质素级分的碳水化合物含量和分子量增加。除去糖和脱酚后，所有木质素级分中对应于最大分解速率（DTG _（max））的温度升高。脱糖预处理后木质素的自由基清除指数高于未处理的其他预处理。这些测试的结果表明，作为预处理，除糖可以增强木质素的提取，从而产生纯净且功能强大的木质素。另外，脱酚或多种工艺有利于大分子木质素的获得。所有结果为富含多酚和糖化合物的生物质生物精制提供了参考。

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