Abstract:
The effect of six surfactants on nifedipine release from 35 % W/W Pluronic F 127 gel were studied by using modified Keshary Chien diffusion cell during 24 hours period. They were Brij 35, Tween 80, sodium laury1 sulfate, diocty1 sodium su1fosuccinate, benza1konium chloride and ch1orhexidine diacetate at 1, 3 and 5 % W/W. It was found that the release kinetics of nifedipine from P1uronic F 127 gel preparations with and without surfactants followed zero order kinetics. The highest average percentage of nifedipine release from Pluronic F 127 at 24 hours period was 47.17 % obtained from the preparation containing 5 % W/W benzalkonium chloride. while the preparation without surfactant (as control) showed only 33.67. It was found that there was no statistically significant difference on the release rate constant between the preparations containing 1 %, 3 % and 5 % W/W of Brij 35 Tween 80, and chlorhexidine diacetate and the control preparation (P>0.01). The release rate constants of nifedipine from Pluronic F 127 gel containing 5 % benzalkonium chloride, 3 %, 5 % sodium laury1 sulfate and 5 % diocty1 sodium sulfosuccinate were statistically significant difference from the control (P <0.01). The concentrations of sodium laury1 sulfate, diocty1 sodium sulfosuccinate and benzalkonium chloride positively correlated with the release rate constants of nifedipine.
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