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Table 4 Antioxidant activity for grape skin using ORAC 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
(μmol TE/g sample) (μmol TE/g sample)
Aromat de Iaşi white 16.8 ± 0.6g 14.7 ± 1.6g
Traminer roz white 17.4 ± 0.2g 20.4 ± 1.4f
Riesling italian white 25.6 ± 0.6e 25.1 ± 1.4e
Feteasca regală white 28.2 ± 0.9d 28.4 ± 1.9d
Muscat Ottonel white 30.1 ± 0.4c 32.4 ± 0.2b
Timpuriu de Cluj white 35.8 ± 1.2b 30.4 ± 0.9c
Napoca blue-black 43.5 ± 0.9a 40.4 ± 0.5a
Chasselas doré white 22.4 ± 1.2f 19.8 ± 0.4f
Muscat Hamburg blue-black 25.8 ± 1.8e 25.2 ± 1.5e
LSD 0.05   0.92 1.14
  1. Values are mean ± SD, n = 3; in each column, mean values with different letters are significantly different at P < 0.05.