Validation of a UV-Spectrophotometric Method for Quantitative Determination of Paclitaxel in a Targeted Delivery System Based on Poly(Lactic–Glycolic Acid) Copolymer Nanoparticles

A UV spectrophotometric method for quantitative determination of paclitaxel in a conjugate of poly(lactic-glycolic acid) (PLGA) copolymer nanoparticles and a protein vector (recombinant third domain of alpha-fetoprotein) was developed. Paclitaxel was determined at wavelength 260 ± 2 nm. The proposed method showed specificity, linearity (R2 = 0.9948) in the range 80 – 120% of paclitaxel nominal load in the polymer matrix (0.18 mg/mL), accuracy, and precision. The developed method could be recommended for inclusion in regulatory documentation for quality control of paclitaxel nanoparticles conjugated with a protein vector.