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Table 3 Antioxidant activity for grape skin using DPPH method

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

Variety Colour Organic Conventional
Antioxidant activity Antioxidant activity
(μg Trolox/g sample) (μg Trolox/g sample)
Aromat de Iaşi white 3.1 ± 0.2h 2.1 ± 0.6g
Traminer roz white 7.3 ± 0.3g 5.4 ± 0.24f
Riesling italian white 8.8 ± 0.7f 8.1 ± 0.4e
Feteasca regală white 10.1 ± 0.18e 12.2 ± 0.9d
Muscat Ottonel white 16.0 ± 0.4c 14.4 ± 0.2c
Timpuriu de Cluj white 11.8 ± 1.12d 15.73 ± 1.9c
Napoca blue-black 32.12 ± 1.4a 25.07 ± 1.3a
Chasselas doré white 7.41 ± 0.3g 2.8 ± 0.2g
Muscat Hamburg blue-black 23.01 ± 0.1b 22.77 ± 0.5b
LSD 0.05   0.86 1.73
  1. Values are mean ± SD, n = 3; in each column, mean values with different letters are significantly different at P < 0.05.