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Isoflavones and Antioxidant Capacity of Commercial Soy-Based Beverages: Effect of Storage

  • CALLOU, Katia Rau De Almeida
  • SADIGOV, Shamil
  • LAJOLO, Franco Maria
  • GENOVESE, Maria Ines
Publication Date
Jan 01, 2010
Biblioteca Digital da Produção Intelectual da Universidade de São Paulo (BDPI/USP)
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Samples of 11 different brands of commercially available soy-based beverages (n = 65), including products made from soy protein isolate (SPI) and soy milk, mixed with fruit juice and/or flavoring, were analyzed for their isoflavone content and in vitro antioxidant activity. There was a large variation in isoflavone and total phenolics contents ranging from 0.7 to 13 mg of isoflavones/200 mL and from 6 to 155 mg equivalents of catechin/200 mL, respectively. The antioxidant activity also varied significantly among products. Storage of the beverages at room temperature caused a significant decrease of antioxidant capacity, soluble phenolics, and isoflavone contents after 9 months. When soybeans used for beverage production were stored for up to 6 months in silos, the resulting products were not affected. However, a decrease of malonyl and a proportional increase of free glucosidic forms of isoflavones were observed after storage of both the raw material and the beverages.

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