Analytical methods
(a) Total soluble solids, total titratable acidity, pH values and ascorbic acid were determined according to.
(b) Browning index was determined according to the method of, 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.
(d) Determination of total anthocyanins content: The total anthocyanins were determined as reported by. Ten gm of sample was filtered through glass wool, and the pulp washed with 90 ml of a Ethanol: HCl mixture previously prepared mixing 79.7 ml of anhydrous ethyl alcohol with 20.3 ml of HCl