Table 4.

Values of concentration (expressed in ppm) of four main pigments in ‘on-the-shelf’ EVOOs (i.e., pheophytin a, pheophytin b, β-carotene and lutein) as obtained from the deconvolution analysis of UV-vis absorption spectra the EVOO samples, after about 4 months from their production. Total amount of pigments is also reported. For each EVOO sample the concentration values obtained from the best fitting analysis are shown with the respective value of R².

Label	Pheophytin b	Pheophytin a	β-Carotene	Lutein	Total Pigments	R 2
T1	1.3 ± 0.5 ppm	16.0 ± 0.3 ppm	1.6 ± 0.1 ppm	8.0 ± 0.1 ppm	26 ± 1 ppm	0.997
T2	2.5 ± 0.2 ppm	30.1 ± 0.2 ppm	3.2 ± 0.1 ppm	10.3 ± 0.1 ppm	46.1 ± 0.6 ppm	0.998
T3	1.3 ± 0.2 ppm	10.9 ± 0.1 ppm	1.4 ± 0.2 ppm	5.7 ± 0.2 ppm	19.4 ± 0.7 ppm	0.997
T4	0.7 ± 0.2 ppm	9.5 ± 0.2 ppm	1.5 ± 0.1 ppm	6.5 ± 0.1 ppm	18.2 ± 0.6 ppm	0.998