Abstract
A novel, dual gradient LC method for quantification of vardenafil (VR) and its degradant products was developed with a multivariate approach. In the QbD approach, primary parameters were screened from the Ishikawa diagram and studied via Plackett Barman’s design. Critical factors (mobile phase composition A, mobile phase composition B, temperature and flow rate) were optimized by central composite design (CCD). Optimized dual gradient method includes A: (water:ACN) (400:100, v/v) pH adjusted in the aqueous phase to 4.7 with acetic acid, B: (water: ACN) (200:300, v/v), 0.9 mL/min flow rate, 20 °C temperature and 36 min as run time. Found eight degradant peaks of VR in different stress conditions were evaluated by LC–PDA and are different from USP 2018 monograph. The study reveals that VR is prone to degrade in sunlight, thermal and hydrolysis, while stable in oxidation. The developed LC method found sensitive, specific, robust with linearity ranging 10–35 µg/mL and correlation coefficient (R2) 0.9997. The fully validated stability-indicating method is green, buffer-free, LC–MS compatible, precise, robust and accurate. The developed method can be successfully applied to monitor the stability of VR from its marketed formulation and can be extrapolated to measure the VR from biological samples.
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Abbreviations
- CQA:
-
Critical quality attribute
- DP:
-
Degradation product
- DMSO:
-
Dimethyl sulfoxide
- ED:
-
Erectile dysfunction
- FTIR:
-
Fourier transforms infrared spectrometer
- MFAT:
-
Multiple factors at a time
- OFAT:
-
One factor at a time
- QbD:
-
Quality by design
- QTPP:
-
Quality target product profile
- SIAM:
-
Stability indicating analytical method
- VR:
-
Vardenafil
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The authors would like to thank the Institute of Pharmacy, Nirma University, India for providing necessary facilities and fellowship for this work.
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Patel, M.N., Kothari, C.S. A Comprehensive Stability Study of Vardenafil Using Quality by Design Approach. Chromatographia 84, 751–767 (2021). https://doi.org/10.1007/s10337-021-04059-2
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DOI: https://doi.org/10.1007/s10337-021-04059-2