Table 4 The antioxidant activity (in DPPH, ABTA, FRAP, CUPRAC assays) of apple peels obtained by conventional and ultrasound assisted extraction.

From: Phenolic content, chemical composition and anti-/pro-oxidant activity of Gold Milenium and Papierowka apple peel extracts

Apple variety

Ultrasound assisted

Conventional

Ultrasound assisted

Conventional

DPPH/EC50 [mg/mL]

ABTS/EC50 [mg/mL]

Gold Milenium

0.142 ± 0.011*

0.119 ± 0.004

0.095 ± 0.003

0.115 ± 0.020

Papierowka

0.097 ± 0.015

0.095 ± 0.011

0.061 ± 0.009

0.070 ± 0.014

 

FRAP [μMFe2+]

0.39 mg/mL**

0.78 mg/mL

Gold Milenium

57.182 ± 6.214**

58.647 ± 0.273

118.122 ± 6.428

125.960 ± 3.436

Papierówka

95.990 ± 1.881

89.715 ± 0.714

197.327 ± 5.415

110.557 ± 14.474

 

CUPRAC/Trolox equivalents [μM]

0.39 mg/mL

0.78 mg/mL

Gold Milenium

76.720 ± 6.437

91.160 ± 9.459

145.560 ± 8.406

150.733 ± 14.088

Papierówka

102.513 ± 6.534

97.813 ± 2.282

227.210 ± 10.102

212.127 ± 7.563

  1. *Mean values from three independent experiments ± SD are shown.
  2. **0.39 and 0.78 mg/mL—the tested concentration of ethanolic extract of apple peels.
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