Carotenoids, total polyphenols and antioxidant activity of grapes (Vitis vinifera) cultivated in organic and conventional systems

Table 4 Antioxidant activity for grape skin using ORAC method

Variety	Colour	Organic	Conventional
		Antioxidant activity	Antioxidant activity
		(μmol TE/g sample)	(μmol TE/g sample)
Aromat de Iaşi	white	16.8 ± 0.6^g	14.7 ± 1.6^g
Traminer roz	white	17.4 ± 0.2^g	20.4 ± 1.4^f
Riesling italian	white	25.6 ± 0.6^e	25.1 ± 1.4^e
Feteasca regală	white	28.2 ± 0.9^d	28.4 ± 1.9^d
Muscat Ottonel	white	30.1 ± 0.4^c	32.4 ± 0.2^b
Timpuriu de Cluj	white	35.8 ± 1.2^b	30.4 ± 0.9^c
Napoca	blue-black	43.5 ± 0.9^a	40.4 ± 0.5^a
Chasselas doré	white	22.4 ± 1.2^f	19.8 ± 0.4^f
Muscat Hamburg	blue-black	25.8 ± 1.8^e	25.2 ± 1.5^e
LSD 0.05		0.92	1.14

Values are mean ± SD, n = 3; in each column, mean values with different letters are significantly different at P < 0.05.

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