胶原降解物制备表面活性剂能的研究

Preparation and Properties of Amino Acid Surfactants with Different Lipophilic Groups

将胶原蛋白水解物与不同碳链长度的酰氯进行反应,制备了一系列不同碳链长度的CxLS表面活性剂;根据反应后产物中的游离氨基转化率确定最佳反应条件。通过FT-IR对CxLS的结构进行表征,同时测定了CxLS溶液的表面张力、起泡性和泡沫稳定性等参数。结果表明:合成CxLS的最佳反应pH值为9,乙酸乙酯与月桂酰氯的体积比为2∶1,反应温度为60℃,转化率最高为77.9%。随着酰氯的碳链长度增加,CxLS中游离氨基含量下降,泡沫稳定性增加。酰氯碳链长度为12的月桂酰基CxLS具有最低的表面张力和良好的泡沫稳定性。

The collagen hydrolysate was prepared by waste leather shavings via alkali hydrolysis.According to Schotten-Baumann reaction,varied collagen hydrolysate-based amino acid surfactants were prepared with collagen hydrolysate and different kinds of acyl chloride with different carbon chain length.The optimal reaction conditions were determined by the free amino content in surfactant solution.The structures of amino acid surfactants were evaluated by Fourier transform infrared spectroscopy analyses(FT-IR).Their physicochemical properties,such as surface tension,foaming and foam stability were investigated.It can be obtained that the reaction pH value was 9,the volume ratio of ethyl acetate to lauroyl chloride was 2∶1,the reaction temperature was 60℃and the highest conversion rate was 77.9%.As carbon chain length of acyl chloride increasing,the free amino content in surfactants declined,and their foam stability increased.Lauroyl surfactant with C12 has the lowest surface tension and highest foaming stability.