Open Access

Table 1

Regression equations of the investigated compounds, including the coefficient of determination (R2), range of calibration, LOD and LOQ.

Compounds Regression equation R 2 Range (mg/L) LOD (mg/L) LOQ (mg/L)
Hydroxytyrosol y = 5871
x + 12
0.9997 20–100 8.5 25.76
Catechin hydrate y = 2740
x + 3
0.9998 50–200 4.74 14.38
Tyrosol y = 3969
x + 3
0.9995 25–100 3.59 10.89
p-hydroxybenzoic y = 8637
x + 2
0.9997 10–50 1.59 4.85
Luteolin-7-rutinoside y = 8337
x + 10
0.9998 50–250 6.12 18.55
Verbascoside y = 6089
x + 6
0.9998 100–250 6.86 20.79
Luteolin-7-glucoside y = 11239
x + 8
0.9997 20–100 2.78 8.42
Apigenin-7-glucoside y = 13916
x + 8
0.9998 20–100 2.29 6.95
Oleuropein y = 6210
x + 20
0.9997 100–500 13.43 40.70
Quercetin y = 10950
x + 1
0.9996 5–20 0.63 1.91
Pinoresinol y = 7193
x + 3
0.9995 20–100 2.03 6.16
Apigenin y = 3990
x + 3
0.9996 20–100 3.17 9.61

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