一种新的Bola型表面活性剂及其临界胶束浓度的不同方法测定

摘要

成功合成了一种以苯丙氨酸为极性头基的新的 Bola型表面活性剂1,12-二苯丙氨酸十二烷(DADPhe),并依次用表面张力法、电导率法和芘荧光探针法测定了1,12-二苯丙氨酸十二烷的临界胶束浓度(CMC),测定结果分别为0.04 mmol · L-1、0.03 mmol · L-1和0.0298 mmol·L-1。实验结果表明,此3种方法的测定值略有不同,其中电导率法和芘荧光探针法的数值相近,而表面张力法所得数值与其他2种方法有微小差异,推测与环境因素有关。进一步分析比较3种实验结果的差异性发现,芘荧光探针法测定的结果更为准确适宜。%A novel bola amphiphile 1,12-phenylalanine dodecanediamine(DADPhe),employed phenylalanine as the pole head was synthesized.The CMC of DADPhe was determined by surface tension method, conductivity and pyrene fluorescence spectroscopy with the results 0.04 mmol·L-1 ,0.03 mmol·L-1 and 0.029 8 mmol·L-1 respectively.The experimental results showed that conductivity and pyrene fluorescence spectroscopy have a similar value,and the value of surface tension method,however,has a minor different from them.It is possibly because of the environmental factors.The results with comparative analyses showed that the pyrene fluorescence spectroscopy method is the most accurate and suitable.