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The evolution of the vitamin C content of a model system solution (0.6 mg/mL) with different concentrations of HT added (0.05, 0.1, 0.5 and 1 mg/mL of solution) stored at room temperature (a) and at 4 °C (b) with DTT (+DTT = total ascorbic [AA + DHAA]) and without DTT (−DTT only acid ascorbic, AA). The data are shown as mean ± SD of quadruplicates. Letters (a–e) indicate significant differences among groups at p < 0.05.
