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- E-ISSN 2288-8985
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Identification and evaluation of fragmentation pathways of PDE-5 inhibitor analogues using LC-QTOF-MS
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
2015, v.28 no.4, pp.278-287
https://doi.org/10.5806/AST.2015.28.4.278
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(2015). Identification and evaluation of fragmentation pathways of PDE-5 inhibitor analogues using LC-QTOF-MS. Analytical Science and Technology, 28(4), 278-287, https://doi.org/10.5806/AST.2015.28.4.278
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Abstract
Phosphodiesterase type 5 inhibitors (PDE-5 inhibitors) are used in the treatment of erectile dysfunction. In recent years, a number of reports have been conducted on dietary supplements contaminated with PDE-5 analogues. In this study, 58 analogues of PDE-5 inhibitors were sorted into five groups: tadalafil, sildenafil, hongdenafil, vardenafil, and other analogues. These analogues were then evaluated using a liquid chromatographyquadrupole- time of flight mass spectrometry (LC-QTOF-MS) electrospray ionization mass method. Each compound has a unique fragmentation ion, which can be easily analyzed qualitatively. The fragmentation pathways of the analogues were elucidated based on the QTOF-MS and MS/MS data. Common ions were confirmed for each group by analyzing the structural characteristics and fragmentation pathways. Specifically, common ions were observed at m/z 169.08 and 135.04 (tadalafil analogues), m/z 311.15 and 283.12 (sildenafil analogues and hongdenafil analogues), and m/z 312.16 and 151.09 (vardenafil analogues). The advantage of this method is that the structure of unknown components can be determined by interpreting the product ions. Hence, the developed method can be used for the identification of unknown compounds. Fragmentation pathways may also aid in the detection and identification of PDE-5 inhibitor analogues.
- keywords
- PDE-5, LC-QTOF-MS, fragmentation pathway, identification, unknown compounds
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