2.3.6 Water Activity (Aw) InfluenceWater activity is another factor influencing the stability of anthocyanins. Reduced water activity enhances anthocyanin stability. Anthocyanin pigments in dried forms can exhibit remarkable stability. Anthocyanins are stable when stored in dry crystalline form or on dry paper chromatograms, which leads to the hypothesis that water is involved in discoloration reactions (Markaris, Livingston, & Fellers, 1957). The degradation of anthocyanins in freeze-dried strawberry puree increases when stored at high relative humidity conditions (Erlandson & Wrolstad, 1972). A study also reported the same trend that increasing Aw increased the degradation rate of anthocyanins (Garzón & Wrolstad, 2001).
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