Abstract
Mixed micellization behavior of an amphiphilic phenothiazine
drug promazine hydrochloride (PMZ) in the presence of conventional
dodecyltrimethylammonium bromide (DTAB) as well as gemini
1,4-bis(N-dodecyl-N,N-dimethylammonium)butane
bromide (12-4-12) cationic surfactants has been studied at four
different fixed temperatures and compositions by conductometric
technique. The experimental data have been analysed by considering
different theoretical models of Clint, Rubingh, Motomura and
Rodenas. The cmc and cmcid values indicate mixed
micelle formation between the components and strong synergism is
observed in the mixed systems. The micellar (actual) mole
fractions of surfactants
(χ
1
Rub,
χ
1
M,
χ
1
Rod and
χ
1
id), calculated on the
basis of different theoretical proposed models used in the present
study, show greater contribution of surfactants in mixed
micelles. Activity coefficients (f
1
and f
2) are always less than unity
indicating nonideality in the systems. Thermodynamic parameters
are also evaluated and discussed which suggest that at higher
temperatures dehydration of hydrophobic part of the drug takes
place.
摘要:在传统的十二烷基三甲基溴化铵(DTAB)和双明烷基溴化铵(12-4-12)阳离子表面活性剂存在下,研究了一种两性的吩噻嗪类药物盐酸异丙嗪(PMZ)的混合胶束化行为,通过电导法在四种不同固定温度和组成下进行了研究。实验数据通过Clint、Rubingh、Motomura和Rodenas等不同理论模型进行分析。临界胶束浓度(cmc)和cmcid值表明组分之间形成了混合胶束,并且在混合系统中观察到强烈的协同作用。根据本研究中使用的不同理论模型计算的表面活性剂的胶束(实际)摩尔分数(χ1Rub、χ1M、χ1Rod和χ1id)显示出表面活性剂在混合胶束中的更大贡献。活度系数(f1和f2)始终小于单位,表明系统中存在非理想性。还评估和讨论了热力学参数,表明在较高温度下,药物疏水部分发生脱水。