This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process which may lead to differences between this version and the Version of Record. Please cite this article as doi: 10.1002/BMC.3779 This article is protected by copyright. All rights reserved. TITLE AND AUTHORSHIP INFORMATION A novel bioanalytical method based on UHPLC-HRMS/MS for the quantification of oleuropein in human serum. Application to a pharmacokinetic study Nikolaos Lemonakis 1 , Vassilis Mougios 2 , Maria Halabalaki 1 , Alexios–Leandros Skaltsounis 1 , Evangelos Gikas 3 Affiliation 1 Department of Pharmacognosy and Natural Products Chemistry, Faculty of Pharmacy, National and Kapodistrian University of Athens, 15771, Athens, Greece 2 School of Physical Education and Sports Science, Aristotle University of Thessaloniki, Greece 3 Department of Pharmaceutical Chemistry, Faculty of Pharmacy, National and Kapodistrian University of Athens, Panepistimioupolis Zografou, Athens, Greece * Correspondence Assistant Professor Evagelos Gikas, Department of Pharmaceutical Chemistry, Faculty of Pharmacy, National and Kapodistrian University of Athens, Panepistimioupolis Zografou, 15771, Athens, Greece, E-mail: vgikas@pharm.uoa.gr Phone: +30210 7274850 Fax: +30210 7274594