The samples CAE and CAE + R showed a similar antioxidant capacity that was stable during 17 weeks of storage at 20 °C in darkness. This evolution in antioxidant capacity is in agreement with that observed in plum peel model juices at pH 4.5 in the same storage conditions (Hernández-Herrero & Frutos, 2011), and at pH 4.0 and 23 °C in darkness (Hernández-Herrero & Frutos, 2014a).