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

Table 3 Antioxidant activity for grape skin using DPPH method

Variety	Colour	Organic	Conventional
		Antioxidant activity	Antioxidant activity
		(μg Trolox/g sample)	(μg Trolox/g sample)
Aromat de Iaşi	white	3.1 ± 0.2^h	2.1 ± 0.6^g
Traminer roz	white	7.3 ± 0.3^g	5.4 ± 0.24^f
Riesling italian	white	8.8 ± 0.7^f	8.1 ± 0.4^e
Feteasca regală	white	10.1 ± 0.18^e	12.2 ± 0.9^d
Muscat Ottonel	white	16.0 ± 0.4^c	14.4 ± 0.2^c
Timpuriu de Cluj	white	11.8 ± 1.12^d	15.73 ± 1.9^c
Napoca	blue-black	32.12 ± 1.4^a	25.07 ± 1.3^a
Chasselas doré	white	7.41 ± 0.3^g	2.8 ± 0.2^g
Muscat Hamburg	blue-black	23.01 ± 0.1^b	22.77 ± 0.5^b
LSD 0.05		0.86	1.73

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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