LC-MS and LC-PDA analysis of Hypericum empetrifolium and Hypericum sinaicum.

Within the framework of our continuous efforts to explore Hypericum species from Jordan, we report the analysis of the major active metabolites, naphthodianthrones and phloroglucinols, in the methanolic extracts of two under-explored Hypericum species; H. empetrifolium Willd. and H. sinaicum Hochst. & Steud. ex Boiss., using LC-(+,-)-ESI-MS (TIC and SIM) and LC-UV/Vis spectroscopy. Based on their LC-UV/Vis profiles, retention times and (+,-)-ESI-MS (TIC and SIM) spectral data, hypericin, protohypericin and pseudohypericin were identified in both of the investigated species. In addition adhyperfirin was only detected in H. empetrifolium, while hyperforin and protopseudohypericin were only detected in H. sinaicum. This is the first report documenting the presence of hypericin, protohypericin, pseudohypericin, protopseudohypericin, and hyperforin in H. sinaicum, and adhyperfirin in H. empetrifolium.