About Author:
Patel Sanjay P
Sanjeevan College Of Pharmacy,
Behind Shyam Sarovar Township,
Jaipur-Agra Highway,Dausa-303303,Rajasthan
sanonly4frdz@gmail.com,sanjay_411987@yahoo.com
1.Abstract
Aceclofenac is a drug with narrow therapeutic index and short biological half-life, so can achieve steady state concentration rapidly. This study was aimed at developing and optimizing niosomal formulation of aceclofenac in order to improve its bioavailability as compare to liposomes.This niosome is prepared by modified ether injection technique. In this span 60 & span 20 is used as non ionic surfactants. Different 6 formulation are prepared, In this NFS-1 to 3 formulation are prepared using the span 60 & NFS-4 to 6 are prepared using span 20 along with different proportion of cholesterols. Because of the presence of nonionic surfactant with the lipid, there is better targeting of drugs to tumor, liver and brain. In evaluation study, the effect of the varying composition of non ionic surfactant and cholesterol on the properties such as drug entrapment efficiency, drug content, particle size & shape and drug release were studied. Moreover, the release of the drug was also modified and extended over a period of 72 h in all formulations. NSF-3 emerged as the most satisfactory formulation. Further, release of the drug from the most satisfactory formulation NSF-6 was evaluated through dialysis membrane to get the idea of drug release. The mechanism of dug release was governed by K- Peppas model. In all the niosomes prepared with spans, as the concentration of surfactant increased drug entrapment efficiency increased. Among the spans, span 60 having high phase transition temperature (gel to liquid transformation) and having critical packing parameter (CPP) ranging from 0.5 to 1 entrap drug molecule without any cholesterol. The only drawback of span 60 vesicles was rapid leakage of drug from the vesicle because of high phase transition temperature. In all the cases the best fit model was found to be Peppas with ‘n’ value between 0.65 to 0.73 suggesting the non fickian (anomalous) release mechanism for the drug i.e., erosion followed by diffusion controlled. Formulation NSF-6 showed high entrapment efficiency (96.07%±0.35), particle size (4.22±0.47μm) and drug release (87.21%) over 72 h. Hence it was considered to be good niosomal formulation with greater bioavailability.