Quantification of Anti-Osteoporotic Anabolic Peptide in Stealth Lipid Nanovesicles Through Validated RP-HPLC Method

Abstract Background Teriparatide is a recombinant fragment of human parathyroid hormone, a potent osteoanabolic agent used for osteoporosis. Objective The present study endeavored to develop a simple, rapid, and reliable reverse phase-high performance liquid chromatography (RP-HPLC) method for the determination of teriparatide in pegylated lipid nanovesicles for rapid formulation development/optimization. Method A rapid RP-HPLC-based analytical method was developed for the quantification of teriparatide in pegylated lipid nanovesicles. The method was optimized on a Waters XBridge C18 (4.6 × 150 mm, 10 μm) column with a mobile phase consisting of 0.1% formic acid in water and acetonitrile both in a linear gradient program. In the method, a short run time of 9 min was achieved at a flow rate of 1.0 mL/min with an injection volume of 50 µL at a detection wavelength of 210 nm. The developed method was validated according to the ICH Q2 (R2) guideline. The method was applied for the quantification of teriparatide in prepared pegylated lipid nanovesicles. Teriparatide encapsulated pegylated lipid nanovesicles were prepared by the ethanol injection method. Further, these vesicles were characterized for % entrapment efficiency (%EE), particle size, zeta potential, and morphology by Cryo-SEM. Results The teriparatide was eluting at 4.8 min in the run. Further, for the method validation, the linear relationship between concentration and response was established over the concentration range of 50–250 µg/mL with the R2 > 0.999. The method sensitivity was shown with LOD and LOQ with the value of 100 ng/mL and 500 ng/mL, respectively. The method was found to be accurate and precise with the recovery ranging in 100 ± 2% and RSD <2%, respectively. Minor deliberate changes proved the robustness of the developed method. Conclusions These results indicated that the developed and validated method is accurate, precise, rapid, reliable, and fit for the quantification of teriparatide in different formulations. Highlights The RP-HPLC method was developed and validated for the quantification of teriparatide from novel pegylated lipid nanovesicles.