Table 2. Summary of the Phenolic Compounds from Greek and Saudi Extracts Identified and Quantified by HPLC^a.

polyphenolic compounds	retention time (min)	EVOO extract concentration (μg/g EVOO)
		Greek	Saudi
hydroxytyrosol	1.0	15.70	8.52
tyrosol	1.9	23.11	6.92
vanillic acid	2.9	0.51	0.52
caffeic acid	3.0	0.07	0.09
p-coumaric acid	5.7	0.50	0.32
ferulic acid	7.4	0.10	0.18
oleuropein aglycone	13.0	10.42	3.55
luteolin	14.1	1.84	4.72
(+)-pinoresinol	14.6	10.78	14.53
naringenin	15.3	15.68	10.19
apigenin	16.0	1.05	3.76

^aThe wavelength at which the peak for each compound could be most reliably measured is also stated.