The Influence of Harvest Moment and Cultivar on Variability of Some Chemical Constituents and Antiradical Activity of Dehydrated Chokeberry Pomace

Abstract

This paper’s aim was to study how the antioxidant activity and the level of certain phenolic complexes and carotenoids vary in the pomace obtained from the fruits of two cultivars of chokeberry at different times of harvest after reaching the stage of maturity. The influence of the cultivar, harvest moment, and the combined effect of these two factors on the antioxidant activity and the dehydrated pomace content in components with antioxidant potentials, such as total phenolics, total tannins, total flavonoids, lycopene, and β-carotene was analyzed. The methanolic extract from the pomace obtained from the ‘Melrom’ cultivar had the highest efficiency (92.14 ± 5.02%). The antiradical activity of the pomace was maximal (93.27 ± 4.32%) after the middle of the harvest season (3 September). The pomace obtained from the ‘Nero’ cultivar displayed superior levels of phenolic content (13,030.16 ± 1414.46 mg/100 g), flavonoids (4627.83 ± 509.63 mg CE/100 g), tannins (7458.56 ± 529.43 mg/100 g), and lycopene (1.171 ± 0.388 mg/100 g). The ‘Melrom’ cultivar presented superior content of β-carotene (0.313 ± 0.07 mg/100 g). On average, a positive significant correlation between radical scavenging activity with total phenolic content and β-carotene was observed. The combined cultivar × harvest moment effect was reflected in the variations in the total tannins content and the total flavonoid content, but also in the antiradical activity of the methanolic extracts. Dehydrated pomace from chokeberry fruit can be an important source of antioxidant biological compounds and can be used to make innovative foods.

Keywords

• antioxidant activity
• β-carotene
• flavonoids
• lycopene
• phenolics
• tannins