1,1-Diphenyl-2-picrylhydrazyl Radical-scavenging Capacity and Oxygen Radical Absorbance Capacity of Sweet Potato Cultivars with Various Flesh Colors

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  • Oki Tomoyuki
    National Agricultural Research Center for Kyushu Okinawa Region, National Agriculture and Food Research Organization
  • Sato Maki
    National Agricultural Research Center for Kyushu Okinawa Region, National Agriculture and Food Research Organization
  • Yoshinaga Masaru
    National Agricultural Research Center for Kyushu Okinawa Region, National Agriculture and Food Research Organization
  • Sakai Tetsufumi
    National Agricultural Research Center for Kyushu Okinawa Region, National Agriculture and Food Research Organization
  • Sugawara Terumi
    National Agricultural Research Center for Kyushu Okinawa Region, National Agriculture and Food Research Organization
  • Terahara Norihiko
    Department of Food Science for Health, Faculty of Health and Nutrition, Minami-Kyushu University
  • Suda Ikuo
    Department of Food Science for Health, Faculty of Health and Nutrition, Minami-Kyushu University

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Other Title
  • 有色サツマイモのＤＰＰＨラジカル消去能とＯＲＡＣ（活性酸素吸収能）
  • ユウショク サツマイモ ノ DPPH ラジカル ショウキョノウ ト ORAC カッセイ サンソ キュウシュウノウ

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Abstract

1,1-Diphenyl-2-picrylhydrazyl (DPPH) radical-scavenging capacity and oxygen radical absorbance capacity (ORAC) of ten sweet potato cultivars with various flesh colors were measured. The DPPH radical-scavenging activity (DPPH-RSA) was almost the same among the sweet potato cultivars with white, yellow, and orange flesh ; however, purple-fleshed sweet potato cultivars showed about 10 times higher activity than those with other flesh colors. A similar tendency was observed for ORAC. Therefore, electron and hydrogen atom transfer reaction-based assays could both detect the high antioxidant activity of purple-fleshed sweet potatoes. Moreover, a high correlation between the DPPH-RSA and ORAC values was found for three cultivars and seventeen breeding lines of purple-fleshed sweet potato (R=0.894). Based on these results, our DPPH radical assay appears effective as an alternative method for estimating ORAC values of purple-fleshed sweet potatoes.

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