Table 6: Phenolic compounds isolated from Tonda di Villacidro, Tonda di Cagliari, Semidana, and Bosana EVOO hydrophilic fraction.

CompoundsTonda di VillacidroTonda di CagliariSemidanaBosana
(mg/kg)(mg/kg)(mg/kg)(mg/kg)
MinMaxMean±SDMinMaxMean±SDMinMaxMean±SDMinMaxMean±SD

Hydroxytyrosoltr2.70.40.90.612.82.43.6tr7.52.12.63.426.99.08.6
Tyrosolnd2.51.21.00.312.25.33.2tr8.84.52.911.836.722.511.6
Vanillic acidndndndtr0.80.30.20.33.91.31.4tr1.60.60.3
p-Coumaric acidnd0.10.00.10.10.70.30.20.04.61.51.8tr3.20.40.4
3,4-DHPEA-EDA0.419.76.87.40.41.91.00.73.322.011.67.92.067.69.813.3
Pinoresinolndndndndndndtr32.312.414.04.122.99.87.6
p-HPEA-EDA3.423.310.37.90.531.010.610.52.529.213.69.811.266.435.819.9
Luteolin1.04.42.51.82.116.15.53.32.34.53.41.00.27.12.81.7
Acetoxypinoresinol2.38.45.42.5ndndnd0.517.48.46.4tr10.75.33.3
3,4-HPEA-EA0.35.12.21.71.640.714.814.61.073.220.825.722.3145.084.755.4
Apigenin0.96.12.02.01.16.51.91.40.65.91.02.00.22.10.80.4

Min = minimal value; Max = maximal value; mean = average value; SD = standard deviation; nd = not detected (<LOD); identification based on RT and UV-Vis spectra of pure compounds; tentative identification by UV-Vis spectra and comparison of retention times with the literature data; 3,4-DHPEA-EDA, dialdehydic form of decarboxymethyl elenolic acid linked to hydroxytyrosol (decarboxymethyl oleuropein aglycone); p-HPEA-EDA, dialdehydic form of decarboxymethyl elenolic acid linked to tyrosol (decarboxymethyl ligstroside aglycone); 3,4-DHPEA-EA, oleuropein aglycone.