There is increasing awareness of functional potentials of African star apple (ASA) as an underutilized tropical fruit, yet little is known of alterations to its product properties during storage. Changes in antioxidant and antinutritional composition of beverages derived from ASA peel, pulp and seed coat fractions during 8-week storage at 26°C were investigated. Drinks derived from the peel were registered and retained significantly higher concentration of vitamin C (0.53 mg/ml, 45%) than pulp (0.17 mg/ml, 6%) and seed coat (0.35 mg/ml, 9%) drinks. Pulp fraction had higher initial flavonoid and total phenolic contents (6.44 mg/100 ml and 13.37 mg/ml) than peel (3.41 mg/100 ml and 3.05 mg/ml) and seed coat fractions (3.65 mg/100 ml and 3.04 mg/ml) but decreased significantly at 92 and 93%, 90 and 67% and 81 and 67% respectively. Beverages derived from the peel, pulp and seed coat showed 98.67, 75.30 and 76.97% DPPH and FRAP of 22.20, 10.90 and 11.87 µmol/ml respectively. A continuous decrease in oxalates and saponin, and slight increase in tannin and phytate levels were observed in all samples throughout the storage period. Findings confirmed the functional potential of ASA tissue beverages as rich sources of natural antioxidants. Effect of ambient storage on stability of studied bioactive compounds was found to be significant and may be a possible indication of product shelf life.
Key words: Bioactive components, antioxidant activity, anti-nutritional factors, Chrysophyllum albidum, storage stability.
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