Aim

Ketobemidone is an opioid drug that have been using against pain in various circumstances. The current research was aimed to develop and validate a HPLC-PDA method to estimate the ketobemidone in rat plasma.

Materials and Methods

The ketobemidone in the biological matrices (rat plasma) was separated using solvent extraction method using methanol as extracting solvent. An isocratic mobile phase consisting of methanol-water-phosphate buffer at 40:60:0.01 % v/v/v and Kromasil C18 column were used for separation in Liquid Chromatography (LC).

Results

The selected linearity range i.e., 0.10-25μg/mL was acceptable with r2 value 0.9998 as least square method. The determined Lower Limit of Quantification (LLOQ) is 0.10 μg/mL. The intermediate precision studies were performed within and between days; and the data obtained are within a significant range, i.e., %RSD <9.2 and the accuracy was within 10.0% of the relative error.

Conclusion

The developed method to detect the ketobemidone was successfully validated and it was successfully applied on rat pharmacokinetic study.