POLYPHENOLS, ASCORBIC ACID AND CAROTENOIDS CONTENTS AND ANTIOXIDANT PROPERTIES IN FRUITS OF CAPSICUM CHINENSE JACQ.

Abstract

Capsicum chinense Jacq. is the rich source of phytochemical substances, such as vitamin C, phenolic compounds, carotenoids, and occupies a significant place in the cooking of many peoples. The pigment composition, the amount of carotenoids, ascorbic acid and their contribution to the formation of antioxidant properties were studied. The total content of carotenoids and red/yellow pigments varied greatly among the accessions of C. chinense. The highest content of carotenoids 0.581 mg/g was observed in the varieties ‘Ognennaya Deva’ with the red fruit color in the phase of biological ripeness, where red pigments accumulated 56% more than in yellow ones. Fruits of accessions ‘Kolokolchik’ only accumulated yellow pigments, 0.318 mg/g. Presence of significant amount, 2.03 times as much red pigments as yellow ones in the variety ‘Trinidad Scorpion Chocolate’, with protein complex could cause the formation of a brown fruit color. Another tendency was observed in ‘Trinidad Dglahou’. The yellow pigment is 1.5 times as much amount as red, as estimated 0.119 mg/g of yellow and 0.077 mg/g of red pigment. The ascorbic acid content did not depend on the fruit color. Fruits of the ‘Ognennaya Deva’ accumulated the highest amount of ascorbic acid, 301 mg%. The maximum total antioxidant content, was detected in the variety ‘Ognennaya Deva’ 2.65 (TAC, mg.eq. GA/g). Analysis of the dependence of the content of thermo stable antioxidants to the total ones showed the contribution of the unstable antioxidants to thermal effects (particularly ascorbic acid) on the level of 16%, on average. A comparative assessment of the pungency level and quantitative capsaicin content in the fruit was carried out by organoleptic, spectrophotometric and HPLC methods. The intervals of observed concentrations of capsaicin were 1.0-7.5 mg/g of dry weight (HPLC), the level of pungency on the Scoville scale was 17440-153120 SHU. There was a direct correlation between the organoleptic assessment of the pepper fruit pungency and capsaicin content studied by spectrophotometry and HPLC methods.

Keywords

• polyphenols
• carotenoids
• ascorbic acid
• capsicum chinense
• antioxidants
• breeding