INFLUENCES OF MALTODEXTRIN AND HOT AIR TEMPERATURE ON LOSSES OF BETACYANIN AND ANTIOXIDANT CAPACITY IN BEETROOT JUICE SPRAY DRYING

Beetroot (Beta vulgaris L.), which is rich in betacyanin and antioxidant compounds, has been utilized as a good source of red pigment and antioxidants. Nevertheless, these compounds are thermally sensitive, consequently, being degraded in processes conducted at high temperature. This research focused on effects of maltodextrin and hot air temperature on losses of betacyanin and antioxidant capacity in spray drying of beetroot juice. Results indicated that adding maltodextrin and temperature of hot air significantly influenced on loss by thermal effect, consequently, on the recovery yield of betacyanin and antioxidant capacity of beetroot juice powder. Adding maltodextrin enhanced protection of betacyanin and antioxidants in beetroot juice against thermal effect. Increasing temperature of hot air caused increase in loss by thermal effect of betacyanin and antioxidant capacity. The loss of antioxidant capacity by thermal effect was higher than that of betacyanin. Results also indicated that the suitable conditions of spray drying of beetroot juice are adding maltodextrin to reach 30 % w/w of total solid content and 150 oC of hot air temperature.