Biodiesel is an alternative to mineral fuels, with advantages such as biodegradability. However, this makes biodiesel unstable to oxidation. In this way, the use of natural or synthetic antioxidants is necessary. Although many studies have paid attention to the effect of these antioxidants on oxidation stability, not much literature about their effect of them on other properties (before and during storage) was found. The aim of this research study was to characterize biodiesel from corn and sunflower by adding two antioxidants, butylated hydroxyanisole (BHA) and tert‐butylhydroquinone (TBHQ), in order to improve its oxidation stability. Moreover, the effect of oxidation on the parameters of biodiesel was studied by using extreme oxidation conditions to accelerate the oxidation process. Both antioxidants improved the oxidation stability of biodiesel, whereas some parameters were altered (viscosity and acid number), which could make this biofuel, if high concentrations of antioxidants are used, unsuitable for commercialization according to standards.

中文翻译：

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极端氧化条件下抗氧化剂对玉米和向日葵生物柴油特性的影响

生物柴油是矿物燃料的替代品，具有生物降解性等优点。但是，这使生物柴油对氧化不稳定。这样，必须使用天然或合成的抗氧化剂。尽管许多研究已经关注了这些抗氧化剂对氧化稳定性的影响，但是，关于抗氧化剂对其他性能（在储存之前和期间）的影响的文献却很少。这项研究的目的是通过添加两种抗氧化剂丁基化羟基茴香醚（BHA）和叔丁基对苯二酚（TBHQ）来表征玉米和向日葵中的生物柴油，以提高其氧化稳定性。此外，通过使用极端氧化条件加速氧化过程，研究了氧化对生物柴油参数的影响。