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Abstract:The electrochemical reduction behavior of selegiline was investigated by cyclic voltammetry using glassy carbon electrode and validated by square wave cathodic adsorptive stripping voltammetry. Selegiline gave one well-defined reduction peak in the potential range −0.4 to −0.5 V versus Ag/AgCl electrode. The reduction process is irreversible and partial diffusion controlled. Various chemical and instrumental parameters affecting the electroanalytical response for the determination of selegiline were investigated and optimized. Under optimized conditions, the adsorptive stripping peak current is found to be linear over the concentration range of 3.0×10 −7 -2.5×10−5 M with a detection limit of 3.04×10 −8 M and a lower limit of quantification of 1.01×10 −7 M.

Methods: MT microspheres were prepared using emulsion cross-linking method. Polymer-drug compatibility study was done using Fourier transform infrared. Physical characteristics were evaluated by particle size,SEM, flow properties etc. In vitro studies for evaluating drug release for MT-loaded chitosan microspheres were done by dissolution study.Results: Particle size of the formulated microspheres was found to be within the range of 110-130 µm. Flow properties of F1-F7 such as angle of repose, bulk density, and tapped density were found to be within limits. Drug entrapment efficiency was found to be better for all the formulations within the range of 74.82-84.32% w/w. Drug loading capacity was found to be in the range of 56-83.2% w/v. In vitro drug release was found to be in the range of 81.32-96.23% w/v. Conclusion:In spite of all the above results, we conclude that F5 formulation was optimized depending on the data obtained from the drug loading capacity and percentage drug release studies. F5 formulation is formulated with drug-polymer ratio 1:2 with 1% of di octyl sodium sulfo succinate and 8 ml of glutaraldehyde as a cross-linking agent.

The present paper deals with the development of silymarin entrapped Chitosan Phthalate (CP) nanoparticles for targeting colon cancer. The QbD approach is applied to optimize the silymarin loaded chitosan phthalate nanoparticles. DOE was employed to evaluate the dependent variables from the responses of CP nanoparticles. The CP NPs were found to be 140% of mucoadhesivity at pH 7.4, superior to pH 1.2 (10%). The result revealed the chemical or ionic bond formation between the positively charged amino groups of chitosan phthalate and the negatively charged sialic acid residue of mucin present in the mucous membrane. In vitro drug release profiles were carried out under acidic and basic pH conditions. The release of encapsulated silymarin was found to be poor in acidic conditions and maximum in basic conditions. The results suggested that chitosan phthalate nanoparticles could have the potential to enhance the bioavailability of silymarin.