2.7. Ascorbic acid content
The ascorbic acid content in samples was determined based on the 2,6-dichlorophenol-indophenol (DCPIP) visual titration method (Ranganna, 1977). Mango juice was diluted with 3% metaphosphoric acid and filtered. Then, the filtrate was titrated with standardized dye solution (2,6-dichloroindophenol-indophenol and sodium bicarbonate) to a pink end point. The results obtained were expressed as milligrams of ascorbic acid per 100 ml sample, using the following equation: