Total, cumulative fast-kinetics and cumulative slow-kinetics antiradical activities of juices from clementine (Citrus clementina), clementine-hybrids and satsuma (Citrus unshiu) cultivars and their utility as discriminant variables.

摘要

Citrus juices were analysed for radical scavenging activity and kinetics. Juices were tested from: 3 pure clementine (Citrus clementina) cultivars (Clemenules, Hernandine and Marisol); 2 clementine-hybrid cultivars, Nova (clementine x tangelo cv. Orlando) and Fortune (clementine x mandarin cv. Dancy); 1 mandarin-hybrid cultivar, Ortanique (mandarin x orange); and 1 satsuma cultivar (Citrus unshiu cv. Clauselline). Total antiradical activity decreased in the following order: pure clementine and Nova > Ortanique > Fortune and Clauselline. Cumulative fast-kinetics antiradical activity was the major contributor to total antiradical activity, accounting for approx. 87% of the total. Ascorbic acid content was the major contributor to cumulative fast-kinetics antiradical activity, accounting for approx. 93.5%. A weak correlation (r2 = 0.151) between total flavanone-7-O-glycosides (FGs, Narirutin, Hesperidin and Didymin) content and cumulative slow-kinetics antiradical activity was observed. However, ascorbic acid and total FGs contents showed a significant negative correlation (r2 = 0.658). By using the cumulative fast-kinetics and slow-kinetics antiradical activities as variables, all the assayed juices could be distinguished from each other (P < 0.05) by statistical multivariate discriminant analysis.