Figure 1.

The influence of pH, temperature, light, and redox agents on the retention rate of blueberry anthocyanin extracts (BAEs) during six-hour storage. (A) pH: pH 1, 2, 3, 4, 5, and 6; (B) temperature: 20, 40, 60, 80, and 100 °C; (C) light: no light, indoor natural light, direct sunlight, ultraviolet light; (D) redox agent: 2% Na₂SO₃ and 2% H₂O₂. BAEs without an added redox agent were used as a control group. Data are represented as the mean ± standard deviation (SD, n = 3). Different lowercase letters indicate significant differences in BAE retention rate with different treatments at the same storage time (p < 0.05).