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Relative concentration of polyphenols in the extract during shelf-life at 37 °C (citric buffer pH = 3, 50 mM) as function of the presence of ascorbic acid (AA, 0.022%) and fructose (Fru, 10%) (A) pelargonidin-3-O-glucoside, (B) kaempferol-3-O-malonylglucoside, (C) ferulic acid hexose derivative, (D) procyanidin B. * Error bars represent standard error (n = 2). * Small letters near the regression line represent significant differences (p < 0.05), according to the colors in the legend.
