Oxygen radical absorbance capacity (ORAC) is a method for evaluating antioxidant capacities of both hydrophilic compounds (H-ORAC) and lipophilic compounds (L-ORAC). In this study, we evaluated antioxidant capacities of four vegetables (spinach, komatsuna, tomato, and cucumber) from different season and regions using ORAC methods. H-ORAC values of spinach, komatsuna, tomato, and cucumber ranged from 915.2 to 3302.7 μmol Trolox equivalent (TE)/100 g fresh weight (FW), 517.5 to 2312.2 μmol TE/100 gFW, 264.0 to 491.7 μmol TE/100 g FW, and 152.8 to 265.7 μmol TE/100 g FW, respectively. L-ORAC values of them ranged from 545.0 to 1387.3 μmol TE/100 g FW, 186.8 to 827.8 μmol TE/100 gFW, 27.6 to 55.7 μmol TE/100 g FW, and 97.0 to 182.4 μmol TE/100 g FW, respectively. Differences in their H-ORAC values were observed among producing area. H-ORAC values of cucumber harvested in summer were higher than in winter, whereas that of spinach harvested in summer was lower than in winter. Neither producing area nor harvest time affected their L-ORAC values under this experimental condition. Therefore, it is suggested that producing area and harvest time are important factors in antioxidant capacities of vegetables.
酸化ストレスが様々な疾病に寄与していることが明らかにされており, 食品由来の抗酸化物質の摂取が重要視されてきている. 本研究では, ラジカル捕捉能を測定するORAC法を用いて, 産地および収穫時期によるホウレンソウ, 小松菜, トマト, およびキュウリの抗酸化能の変動に関して基礎的な知見を得ることを目的とした. その結果, 産地および収穫時期は上記野菜の親水性抗酸化物質量に影響を及ぼすことを明らかにした.
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産地および収穫時期の違いがホウレンソウ・小松菜・トマト・キュウリの抗酸化能に及ぼす影響
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