Combining a flow reactor with spray dryer to allow the preparation of food-grade quality sodium 2-polyhydroxyalkyl-1,3-thiazolidine-4-carboxylates with a low environmental impact
作者:Olalla Novo、Mercè Balcells、Ramon Canela-Garayoa、Jordi Eras
DOI:10.1039/c5ra19880a
日期:——
these compounds in powder form. The reaction was carried out using equimolar ratios of L-cysteine, aldehyde, and sodium hydroxide in water as solvent. Formaldehyde, three aldohexoses (D-glucose, D-galactose, D-mannose), three aldopentoses (D-xylose, D-ribose, D-arabinose), and mixtures of these compounds were used as the starting aldehydes. We optimized the pH, reaction temperature, and pump flow rate
1,3-噻唑烷-4-羧酸(TCA)和2-取代的1,3-噻唑烷-4-羧酸(2S-TCA)在农学,食品和药品中用作半胱氨酸和谷胱甘肽的添加剂前药。行业。使用连接到喷雾干燥器的流动系统,在这里我们制备了粉末形式的这些化合物的钠盐。使用等摩尔比的L-半胱氨酸,醛和氢氧化钠在水中作为溶剂进行反应。甲醛,三个醛己糖(D-葡萄糖,D-半乳糖,D-甘露糖),三个醛糖(D-木糖,D-核糖,D-阿拉伯糖)和这些化合物的混合物用作起始醛。我们优化了pH,反应温度和泵的流量,以达到55%至100%的转化率。对喷雾干燥的参数进行了优化,以达到超过79%的收率。最后,测量粉末的物理性质和这些盐在水中的稳定性,并与相应的酸进行比较。发现这些盐在30天后比酸更稳定(分别为13.6%至17.7%和59.8%至92.1%的水解)。由于所使用的反应物,溶剂,水和碱可以是食品级的,因此最终产品将满足食品级质量的要求。