Effect of cooking on antioxidant activity in commonly consumed foods
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Date
2018
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CCSHAU
Abstract
The present investigation was conducted to evaluate the antioxidant activity of commonly consumed foods and effect of cooking on their antioxidant activity. The results of the study indicated that the total phenolics and flavonoids of cereals ranged from 30.07 to 116.66 GAE mg/100g and 17.74 to 88.88 mg RE/100g, respectively. Ferric Reducing Antioxidant Power (FRAP) and DPPH radical scavenging activity ranged from 161.59 to 760.42 mg TE/100g and 23.11 to 81.29 mg TE/100g, respectively. Boiling and pressure cooking brought about significant (p≤ 0.05) decrease in antioxidant activity of cereals except maize. Total phenolics and flavonoids of pulses ranged from 33.09 to 99.57 GAE mg/100g and 21.16 to 65.73 mg RE/100g, respectively. Ferric Reducing Antioxidant Power (FRAP) and DPPH radical scavenging activity ranged from 97.20 to 394.83 mg TE/100g and 21.08 to 107.14 mg TE/100g, respectively. Among pulses studied kidney bean had highest antioxidant activity. Antioxidant activity of most of the pulses was decreased upon boiling and pressure cooking. Total phenolics and flavonoids of green leafy vegetables ranged from 39.90 to 733.09 GAE mg/100g and 26.09 to 238.42 mg RE/100g, respectively. Ferric Reducing Antioxidant Power (FRAP) and DPPH radical scavenging activity ranged from 131.03 to 2053.75 mg TE/100g and 10.89 to 143.68 mg TE/100g, respectively. Among green leafy vegetables mint had highest antioxidant activity. Boiling and pressure cooking caused both positive and negative effect on antioxidant activity of green leafy vegetables. Total phenolics and flavonoids of other vegetables ranged from 13.53 to 50.92 GAE mg/100g and 0.94 to 37.17 mg RE/100g, respectively. Ferric Reducing Antioxidant Power (FRAP) and DPPH radical scavenging activity ranged from 53.23 to 190.96 mg TE/100g and 6.65 to 50.72 mg TE/100g, respectively. Boiling and pressure cooking caused both positive and negative effect on antioxidant activity of other vegetables. Total phenolics and flavonoids of roots and tubers ranged from 14.21 to 89.74 GAE mg/100g and 0.95 to 81.94 mg RE/100g, respectively. Ferric Reducing Antioxidant Power (FRAP) and DPPH radical scavenging activity ranged from 36.43 to 659.38 mg TE/100g and -42.67 to 33.15 mg TE/100g, respectively. Boiling and pressure cooking caused both positive and negative effect on antioxidant activity of roots and tubers. Out of the fruits analysed for antioxidant capacity, it was found that aonla had highest total phenolics (1654 mg GAE,100g), total flavonoids (512.49 mg RE/100g), ferric reducing antioxidant power (23055 mg TE/100g) and radical scavenging activity (6322.36 mg RE/100g) and Vitamin C (400.77 mg/100g). β- Carotene content was highest in mango (2210.99 μg/100g). Vitamin C and β- Carotene content of green leafy vegetables ranged from 39.46 to 148.07 mg/100g and 2053.33 to 4625.33 μg/100g, respectively.
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