Application of high-performance liquid chromatography with charged aerosol detection for universal quantitation of undeclared phosphodiesterase-5 inhibitors in herbal dietary supplements

作者：Poplawska Magdalena^*; Blazewicz Agata; Bukowinska Kinga; Fijalek Zbigniew

来源：Journal of Pharmaceutical and Biomedical Analysis, 2013, 84: 232-243.

DOI：10.1016/j.jpba.2013.06.018

• Charged aerosol detector
• Universal calibration
• PDE-5 inhibitor
• Adulteration
• Counterfeit dietary supplement

Incidents of detecting novel analogues of phosphodiesterase 5 (PDE-5) inhibitors in illicit dietary supplements for erectile dysfunction are constantly reported. However, little is known about their content in a single dose, mainly due to the poor availability or inaccessibility of pure reference standards. This study presents a new strategy of quantitative analysis of unknown and recently identified compounds. Charged aerosol detector (CAD), described as %26quot;universal detector%26quot;, combined with high-performance liquid chromatography (HPLC) system proved to be a useful tool for fast and simple quantitation of PDE-5 inhibitors%26apos; analogues in a complex herbal matrix without individual reference standards available:Universal calibration was employed for calculations. Two easily obtainable reference materials - sildenafil and tadalafil - were selected as universal standards and the content of analogues was estimated with respect to their response. The error of proposed indirect determination was found to be +/- 3%, which is less than enough to obtain a reliable result of the content. The elaborated method was applied for quantitative analyses of PDE-5 inhibitors and 10 analogues detected in 22 illicit dietary supplements and two bulk powdered herbal materials. All target analogues were identified using time-of-flight mass spectrometry with electrospray ionization. Obtained results indicate that the quantity of PDE-5 inhibitors in all tested samples is considered to be pharmacologically relevant.

• 出版日期2013-10