磺酸基功能化C/Si材料催化合成短碳链结构磷脂

Production of structured phospholipids rich in short-chain fatty acids catalyzed by SO3H-functionalized carbon/silica materials

摘要:

通过化学活化有机磺酸前驱体，低温下制备磺酸基功能化碳/硅材料（C/Si-SO3H），并将其用于大豆卵磷脂与丙酸乙酯或丁酸甲酯催化合成短碳链结构磷脂的反应中，考察了反应温度、反应时间、催化剂用量及催化剂循环对该酯交换反应的影响。采用FTIR、Raman及Boehm酸含量滴定等手段对C/Si-SO3H进行结构和表面酸性质表征，以建立该催化剂的构效关系。结果表明，C/Si-SO3H表面含有大量Brӧnsted酸性位点，因而催化性能较为突出；当催化剂用量为总质量的7%、40 ℃反应6 h，短碳链结构磷脂中丙酸或丁酸的接入率高达18.33%或16.23%，且C/Si-SO3H循环利用5次而无明显失活。

Abstract:

A kind of sulfonic acid-functionalized carbon/silica (C/Si-SO3H) material was successfully synthesized at low temperature via chemically activating organic sulfonic acid precursors, which was used for catalytic production of structured phospholipids rich in short-chain fatty acids by interesterification of soybean lecithin with ethyl propionate or methyl butyrate. The influences of reaction temperature, reaction time, catalyst amount and catalyst recyclability on interesterification were investigated in detail. Besides, the structure and surface acid properties of the as-prepared C/Si-SO3H catalyst were studied by FT-IR, Raman and Boehm titration method to establish its structure-performance relationship. The results showed that a large amount of Brӧnsted acid sites were grafted onto the C/Si-SO3H surface, suggesting its prominent catalytic activity for production of structured phospholipids rich in short-chain fatty acids. Correspondingly, the propionic acid or butyric acid incorporation was up to 18.33% or 16.23% at 40 ℃ within 6 h when the catalyst loading was 7%. Notably, C/Si-SO3H catalyst was recycled for 5 times without obvious deactivation.