Michele Savino

Phenolic acids profile, nutritional and phytochemical compounds, antioxidant properties in colored barley grown in southern Italy

Free, soluble conjugated, and insoluble bound phenolic acids and some of the main antioxidant phytochemicals (i.e., total polyphenols, proanthocyanidins, carotenoids) were investigated in 20 genotypes of colored barley. These included 16F8 recombinant inbred lines (RILs) obtained from crosses of four parental lines: 2005 FG, K4-31, L94, and Priora. The aim of this work was these to promote the introduction of new barley genotypes with high contents of such natural antioxidants, and of dietary fiber. These new genotypes will enlarge the market of novel functional foods. Large variations were seen in the contents of phytochemicals and β-glucans across these barley genotypes. The highest protein (14.4%) and β-glucan (4.6%) contents were in the blue naked parental genotype 2005 FG. Overall, insoluble bound phenolic acids represented 88.3% of the total phenolic acids, and ferulic acid was the main conjugated phenolic acid. Salicylic and gallic acids were the most represented among the free phenolic acids, with no p-coumaric and cinnamic acids detected. Total polyphenols and proanthocyanidins were highest in the RILs 3009 (2917u202fμgu202fg-1) and 1997 (1630u202fμgu202fg-1). The barley line with high total polyphenols (RIL 3009) also showed the highest antioxidant capacities (by both DPPH and ABTS methods: 13.4u202fμmolu202fg-1 and 15.6u202fμmolu202fg-1, respectively). Among the RILs examined, 3004, 3008, and 3009 showed 30% higher antioxidant capacities than their parentals, thus providing potential health-promoting benefits.