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A capillary electrophoresis method for free fatty acids screening and acidity determination in biodiesel
Electrophoresis ( IF 2.9 ) Pub Date : 2021-02-02 , DOI: 10.1002/elps.202000289
Renata Takabayashi Sato 1 , Júlia Bruce Alves 1 , Tatiane Lima Amorim 1 , Marcone Augusto Leal de Oliveira 1
Affiliation  

The advent of policies that incentivize or require alternative diesel fuels has increased the demand for the development of fast analytical methods aiming for the quality control of these fuels. This study approached an alternative method for the determination of biodiesel acidity employing capillary zone electrophoresis based on free fatty acids screening and quantification. Sample preparation comprised vortex‐assisted liquid‐liquid extraction of free fatty acids and was a crucial step for analysis. It was studied through a 32 full factorial design considering sample mass and the stirring time. Then, solvent suitability was evaluated univariately. The free fatty acid screening was carried out employing a capillary zone electrophoresis method able to separate C16:0, C18:0, C18:1 n‐9, C18:2 n‐6, and C18:3 n‐3, major fatty acids in a variety of vegetable oils used for biodiesel synthesis. In addition to the straightforward sample preparation protocol, the running time of the developed method was only 12 min. Moreover, ultraviolet absorption indirect detection of analytes was approached to avoid analytes derivatization, considering the lack of chromophore groups in saturated fatty acids. Statistical tests did not evidence any significant differences in the biodiesel acidity determination expressed in percentage of free fatty acids when comparing the proposed capillary zone electrophoresis method and the traditional potentiometric titration approach within the 95% confidence interval, which demonstrates the suitability of this alternative method for the biodiesel quality control in routine.

中文翻译:

一种用于生物柴油中游离脂肪酸筛选和酸度测定的毛细管电泳方法

激励或要求替代柴油燃料的政策的出现增加了对开发旨在控制这些燃料质量的快速分析方法的需求。本研究采用基于游离脂肪酸筛选和定量的毛细管区带电泳来确定生物柴油酸度的替代方法。样品制备包括游离脂肪酸的涡旋辅助液-液萃取,是分析的关键步骤。它通过 3 2研究考虑样品质量和搅拌时间的全因子设计。然后,单变量评价溶剂适用性。采用毛细管区带电泳法进行游离脂肪酸筛选,能够分离主要脂肪酸 C16:0、C18:0、C18:1 n-9、C18:2 n-6 和 C18:3 n-3在用于生物柴油合成的多种植物油中。除了简单的样品制备方案外,所开发方法的运行时间仅为 12 分钟。此外,考虑到饱和脂肪酸中缺乏发色团,采用紫外吸收间接检测分析物以避免分析物衍生化。
更新日期:2021-02-02
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