Detection of Sildenafil Analogues in Herbal Products for Erectile Dysfunction

  title={Detection of Sildenafil Analogues in Herbal Products for Erectile Dysfunction},
  author={Sharon Sze-Yin Oh and Peng Zou and Min-Yong Low and Hwee-Ling Koh},
  journal={Journal of Toxicology and Environmental Health, Part A},
  pages={1951 - 1958}
Sildenafil, the active ingredient in Viagra (Pfizer), is a prescription medicine used for erectile dysfunction. Compounds with chemical structures similar to that of sildenafil were isolated and purified during the analysis of some herbal products marketed for treatment of erectile dysfunction. Structural elucidation using liquid chromatography–diode array detection, infrared spectroscopy, liquid chromatography–tandem mass spectrometry, and nuclear magnetic resonance spectroscopy confirmed that… 
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