Abstract
In this work, high-performance liquid chromatography (HPLC) coupled to electrospray time-of-flight mass spectrometry (ESI-TOF-MS) and electrospray ion trap multiple-stage tandem mass spectrometry (ESI-IT-MS2) has been applied to screen phenolic compounds in olive leaf extracts. The use of a small particle size C18 column (1.8 μm) provided great resolution and made separation of a lot of isomers possible. The structural characterization was based on accurate mass data obtained by ESI-TOF-MS, and the nature of fragmentation ions were further confirmed by ESI-IT-MS2 when possible. In addition, we employed tetrazolium salt (MTT)-based assays to assess the effects of olive leaf extracts on the growth of human tumor-derived cells. Upon this approach, we achieved an accurate profile of olive leaf phenolics along with the identification of several important isomers of secoiridoids and flavonoids. This will allow a better understanding of the complete composition of olive-leaf-bioactive compounds as well as their involvement in Olea europaea L. biochemical pathways. Importantly, olive leaf extracts exhibited dose-dependent inhibitory effects on the metabolic status (cell viability) of three breast cancer models in vitro. Since the tumoricidal activity of the extracts should be mainly attributed to the identified olive leaf phenolics, these findings warrant further investigation at the structure–function molecular level to definitely establish the anticancer value of these phytochemicals.
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Acknowledgments
The author, Dr. Shaoping Fu, acknowledges financial support from the Spanish Ministry of Education and Science (project SB2006-0157). The author, Dr. David Arráez-Román, also acknowledges financial support from the Consejería de Innovación, Ciencia y Empresa (Junta de Andalucía, Excellence Project P07-AGR-02619, Contrato reincorporación de doctores). The authors also gratefully acknowledge the financial support from MEC (AGL2008-05108-CO3-03/ALI and AGL2007-60778/ALI to V. Micol) and Junta de Andalucía, Excellence Project P09-CTS-4564. Work by Javier A. Menendez was supported in part by Instituto de Salud Carlos III (Ministerio de Sanidad y Consumo, Fondo de Investigación Sanitaria-FIS, Spain, Grants CP05-00090, PI06-0778 and RD06-0020-0028 to Javier A. Menendez). Javier A. Menendez was also supported by a Grant from the Fundación Científica de la Asociación Española Contra el Cáncer (AECC, Spain). We also thank New Developments in Nutraceuticals, Inc., for providing us with the olive leaf extracts.
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Fu, S., Arráez-Roman, D., Segura-Carretero, A. et al. Qualitative screening of phenolic compounds in olive leaf extracts by hyphenated liquid chromatography and preliminary evaluation of cytotoxic activity against human breast cancer cells. Anal Bioanal Chem 397, 643–654 (2010). https://doi.org/10.1007/s00216-010-3604-0
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DOI: https://doi.org/10.1007/s00216-010-3604-0