Abstract 3,3′,5,5′-Tetramethoxybiphenyl-4,4′-diol (TMBP) is described in the literature as having antioxidant activity, and can be obtained through enzyme-catalyzed processes. Its use as an additive to biodiesel offers a more sustainable substitute for the antioxidants commonly used for the conservation of this type of biofuel. In this work, TMBP was synthesized from 2,6-dimethoxyphenol catalyzed by the laccase from Botryosphaeria rhodina MAMB-05, and applied to soybean biodiesel to evaluate its antioxidant action by the determination of the induction period, and kinetic and thermodynamic oxidation parameters. Biodiesel samples containing TMBP presented induction periods higher than the 6 h in the Rancimat test conducted at 110 °C. The reaction rate constants at all temperatures examined were lower than those obtained for samples containing tert -butylhydroxytoluene (BHT), a common synthetic antioxidant added to biodiesel. The kinetic and thermodynamic parameters of oxidation indicated the effectiveness of TMBP in the inhibition of oxidative processes in soybean biodiesel compared to BHT. The antioxidant action of TMBP was not impaired as a function of thermal degradation, as thermogravimetry analyzes indicated degradation events occurring only above 270 °C.

中文翻译：

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3,3',5,5'-四甲氧基联苯-4,4'-二醇：一种增强大豆生物柴油氧化稳定性的新型抗氧化剂

摘要 3,3',5,5'-四甲氧基联苯-4,4'-二醇（TMBP）在文献中被描述为具有抗氧化活性，可以通过酶催化过程获得。将其用作生物柴油的添加剂，为保护此类生物燃料常用的抗氧化剂提供了一种更具可持续性的替代品。 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 在这项工作中，TMBP 由来自 Botryosphaeria rhodina MAMB-05 的漆酶催化的 2,6-二甲氧基苯酚合成，并应用于大豆生物柴油，通过测定诱导期、动力学和热力学氧化参数来评估其抗氧化作用。在 110 °C 下进行的 Rancimat 测试中，含有 TMBP 的生物柴油样品的诱导期高于 6 小时。在所有检测温度下的反应速率常数都低于含有叔丁基羟基甲苯 (BHT)（一种添加到生物柴油中的常见合成抗氧化剂）的样品的反应速率常数。氧化的动力学和热力学参数表明，与 BHT 相比，TMBP 在抑制大豆生物柴油氧化过程中的有效性。TMBP 的抗氧化作用不会因热降解而受损，因为热重分析表明降解事件仅发生在 270 °C 以上。