Tramadol HCl was microencapsulated with Ethylcellulose using multiple emulsion solvent evaporation method. A 32 factorial design employed to study the effect of drug: polymer ratio and volume of External phase (1% PVA) on % yield, % encapsulation efficiency, particle size, % drug release rate. The drug: polymer ratio and volume of continuous phase were significant effect on % yield, % entrapment efficiency, particle size, % drug release rate. % drug release was Biphasic system first initially bursting effect and finally sustained. Higher Percentage yield (77.4%) and Higher Percentage Encapsulation Efficiency(31.1%) were observed in Batch EC3. All the microspheres were spherical in nature its surface was smooth observed in SEM report.

Author(s): Patel Keyur , Patel Vishnu, Patel Mandev, Patel Pranav, Ajmera Ankit, Rathod Kinjal

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