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Fruit Quality, Antioxidant Contents and Activity, and Antiproliferative Activity of Strawberry Fruit Stored in Elevated CO₂ Atmospheres

Shin, Y., Ryu, J.A., Liu, R.H., Nock, J.F., Polar-Cabrera, K., Watkins, C.B.
Journal of food science 2008 v.73 no.6 pp. S339
strawberries, Fragaria ananassa, fruit quality, antioxidants, fruit composition, antioxidant activity, carbon dioxide, controlled atmosphere storage, ascorbic acid, anthocyanins, flavonoids, phenolic compounds, anticarcinogenic activity, cultivars, firmness, dehydroascorbic acid, liver neoplasms, cultured cells, cell proliferation, temporal variation, food storage
The effects of CO₂ in the storage atmosphere on color, firmness, ascorbic acid (AA), anthocyanins, flavonoids, phenolics, total antioxidant activity, and antiproliferative activity of strawberry fruit have been investigated. "Northeaster" and "Earliglow" strawberries were stored in air or in 20% CO₂ (in air) at 3 °C for 20 d. Color changes in Northeaster were delayed more by CO₂ treatment than in Earliglow. Firmness of CO₂-stored fruit increased slightly compared with those stored in air. The increases in total and reduced AA concentrations during air storage were usually prevented by CO₂ storage in both cultivars. Dehydroascorbic acid (DHA) concentrations increased during CO₂ storage. Anthocyanins and flavonoids, and total antioxidant activity of both cultivars were higher in air-stored fruit than in CO₂-stored fruit. The total phenolic concentration was lower in CO₂-stored Earliglow fruit than in air, but storage treatment did not affect that of Northeaster. A 40 mg/mL concentration of Northeaster strawberry extract inhibited about 80% of HepG₂ human liver cancer cell proliferation. CO₂ treatment did not affect the antiproliferative activity of strawberry fruits, but antiproliferative activity was greater at harvest than after storage.