Analytical methods
(a)
Total soluble solids, total titratable acidity, pH values and ascorbic acid were determined according to AOAC (2005).
(b)
Browning index was determined according to the method of Meydev et al. (1977), as its light absorbance at 420 nm.
(c)
Determination of Firmness (N): Firmness (N) measurements were performed with a universal testing machine (Comietech, Type B, Taiwan) equipped with a 2000 N load cell and operated at a crosshead speed of 20 mm/min. The force needed to compress the disk to 15 mm with a flat-plate probe (25 mm diameter) was registered. All measurements were performed at 25 °C as reported by Susana and Almeida (2008).