Bazoti F.N., Gikas E., Puel C., Coxam V., Tsarbopoulos A. (2005) Development of a sensitive and specific solid phase extraction--gas chromatography-tandem mass spectrometry method for the determination of elenolic acid, hydroxytyrosol, and tyrosol in rat urine. J Agric Food Chem 53:6213-21 PubMed (16076096)

Compound Mean content
Tyrosol 31.5 mg/g fresh weight
Hydroxytyrosol 37.5 mg/g fresh weight
Elenolic acid 186.2 mg/g fresh weight
Oleuropein 8.99 mg/g fresh weight