在微乳配方开发过程中,通常选用短链醇作为助表面活性剂,然而有些药物在这些助表面活性剂中的溶解度或相容性并不理想。因此,选用非醇类物质(Plurol^(?) Oleique CC 497、Capyrol^(TM) 90或Transcutol^(?))为助表面活性剂,并以Labrasol^...在微乳配方开发过程中,通常选用短链醇作为助表面活性剂,然而有些药物在这些助表面活性剂中的溶解度或相容性并不理想。因此,选用非醇类物质(Plurol^(?) Oleique CC 497、Capyrol^(TM) 90或Transcutol^(?))为助表面活性剂,并以Labrasol^(?)为表面活性剂,Labrafil^(?)M 1944为油相,分别绘制了空白微乳的伪三元相图。结果表明,这些助表面活性剂的种类和表面活性剂/助表面活性剂比例(K_m)对o/w型微乳的形成有影响。展开更多
Temperature dependent phase behavior of Pseudo-ternary Thiourea X-100 + 1-hexanol (1:5 molar ratios)/oil/water systems is reported. The influence of nature of hydrocarbon oil and type of electrolytes (weak as well as ...Temperature dependent phase behavior of Pseudo-ternary Thiourea X-100 + 1-hexanol (1:5 molar ratios)/oil/water systems is reported. The influence of nature of hydrocarbon oil and type of electrolytes (weak as well as strong) has been investigated on the temperature induced phase behavior of the ternary system. At surfactant concentration, Φs = 40%, a “nose shaped” microemulsion region is observed. Below one-phase microemulsion region, Lα phase appears. The presence of NaCl decreases the domain size of 1Φ micellar region whereas oxalic acid first decreases the domain below Φw 18 in the lower boundry of the phase diagram. The critical weight fraction of water, Φwcri decreases in presence of both electrolytes. However, Φwmax increases in presence of oxalic acid and remains constant in presence of NaCl as compared to salt free system. Furthermore, when cyclohexane was replaced by a longer straight chain hydrocarbon, dodecane, the domain of the one-phase microemulsion region is tremendously increased.展开更多
文摘Temperature dependent phase behavior of Pseudo-ternary Thiourea X-100 + 1-hexanol (1:5 molar ratios)/oil/water systems is reported. The influence of nature of hydrocarbon oil and type of electrolytes (weak as well as strong) has been investigated on the temperature induced phase behavior of the ternary system. At surfactant concentration, Φs = 40%, a “nose shaped” microemulsion region is observed. Below one-phase microemulsion region, Lα phase appears. The presence of NaCl decreases the domain size of 1Φ micellar region whereas oxalic acid first decreases the domain below Φw 18 in the lower boundry of the phase diagram. The critical weight fraction of water, Φwcri decreases in presence of both electrolytes. However, Φwmax increases in presence of oxalic acid and remains constant in presence of NaCl as compared to salt free system. Furthermore, when cyclohexane was replaced by a longer straight chain hydrocarbon, dodecane, the domain of the one-phase microemulsion region is tremendously increased.
