Capacità antiossidante della cariosside in linee di sorgo

In the framework of a preliminary characterization of sorghum breeding lines as potential raw materials for the development of gluten-free food products, the content of antioxidant compounds (total phenols) and total antioxidant capacity (TAC) were determined in 40 genotypes, differing for their grain colour (ranging from white-yellow to red, brown and black) and thousands seeds weight (6.93 - 39.6 g). Maximum TAC value was 125.06 mmolTE/kg dm by ABTS assay and 102.28 mmolTE/kg dm by DPPH. A large variability was observed also for total phenols, ranging from 0.60 to 14.03 gGAE/kg dm. Simple correlation coefficients between antioxidant compounds and colour parameters indicated that the pericarp colour is not per se an efficient marker in the selection of genotypes with specific content of tannins and antioxidant capacity.