Simple HPLC-UV method for the quantification of bupivacaine in human plasma with one step protein precipitation

This research paper revolves around the process of the quantification of bupivacaine in human plasma through the selection of a sensitive high performance liquid chromatography method. The extraction of bupivacaine and ropivacaïne as an internal standard from plasma was performed through the use of hexane along with iso-propylalcohol. After liquid-liquid extraction we moved straightforward to the process of the mobile phase in which we had a combination of acetonitrile and potassium dihydrogen phosphate (65:35, v/v). The separation was carried out on a reversed phase C18 column with UV-detector at 210 nm for bupivacaine and 230nm for the internal standard. This particular examination exhibited excellent linearity (r2=0.999) in peak response over the concentration range of 0.1–1.5μg/mL bupivacaine in human plasma. The mean absolute recoveries for 0.5 and 1.5μg/mL of bupivacaine in plasma using the present extraction procedure were 97.43% and 95.03%, respectively. The intra- and inter-day coefficients of variation in the plasma were less than 12% at the lowest, and less than 10% at other concentrations, and the percent error values were less than 6%. The method displayed a high caliber of sensitivity and selectivity for therapeutic monitoring concentrations of bupivacaine in human plasma.