Polese Riccardo, Pintus Elisa, Nuvoli Luca, Tiana Monica, Pintus Salvatore, Satta Giuseppe, Beccu Andrea, Gaspa Silvia, Carraro Massimo, De Luca Lidia, Azzena Ugo, Pisano Luisa
Dipartimento di Chimica e Farmacia, Università degli Studi di Sassari, Via Vienna 2 07100, Sassari, Italy.
R Soc Open Sci. 2022 Apr 27;9(4):211554. doi: 10.1098/rsos.211554. eCollection 2022 Apr.
The acid-promoted epoxidation of vegetable oils was studied using a variety of acidic ion exchange resins as heterogeneous acid catalysts. Quantitative and selective epoxidation of a series of vegetable oils with different composition of saturated, mono-, di- and tri-unsaturated fatty acids was obtained upon identification of the more efficient catalyst and experimental conditions. Furthermore, optimized reaction conditions were successfully applied to the epoxidation of a waste cooking oil, thus extending our procedure to the valorization of a biowaste, an area of increasing importance within a more sustainable society. The use of quantitative HNMR besides making accurate evaluation of the amounts of reagents to be employed and of the selectivity, allowed facile and rapid quantification of mono-, di- and tri-epoxides, thus providing an indirect indication on the fatty acid composition of the vegetable oils, even in the presence of very low quantities of linolenic acid.
使用多种酸性离子交换树脂作为多相酸催化剂，研究了植物油的酸促进环氧化反应。通过确定更高效的催化剂和实验条件，实现了对一系列含有不同比例饱和、单不饱和、双不饱和及三不饱和脂肪酸的植物油进行定量且选择性的环氧化。此外，优化后的反应条件成功应用于废食用油的环氧化，从而将我们的方法扩展到生物废弃物的增值利用，这在更可持续的社会中是一个日益重要的领域。除了能够准确评估所用试剂的量和选择性外，定量核磁共振氢谱（HNMR）还能方便快速地对单环氧化物、二环氧化物和三环氧化物进行定量，从而即使在亚麻酸含量极低的情况下，也能间接指示植物油的脂肪酸组成。
