ARS | Publication request: Total anthocyanins, total carotenoids, hydrophilic- and lipophilic-ORAC levels in diverse clones and breeding lines over six field environments

Submitted to: American Journal of Potato Research
Publication Type: Abstract Only
Publication Acceptance Date: April 15, 2009
Publication Date: N/A

Technical Abstract: Seven specialty clones were grown in six field locations and tuber samples were analyzed for total carotenoids, total anthocyanins, hydrophilic_Oxygen Radical Absorbance Capacity (ORAC), and lipophilic (ORAC). Four of the genotypes had red or purple pigmented flesh. The highest total anthocyanins content among clones with red or purple coloration in skin and/or flesh at a specific location was 70 mg/100 g fresh weight (FW). By comparison a red or purple skinned white fleshed genotype has 0.5 mg of total anthocyanins This clone, POR04PG82-1, averaged 49 mg over all locations. There was significant genotype x environment interaction for total anthocyanins and H-ORAC for these pigmented clones. Two clones had exceptionally high total carotenoids. POR03PG6-3 averaged 1008 micrograms per 100 g FW reaching a level of 1292 micrograms at one location. POR02PG4-2 averaged 1159 micrograms, reaching a 1320 micrograms at one location. Although total anthocyanins were positively correlated with H-ORAC, such was not the case in comparing total carotenoids with L-ORAC. Locations were not different for L-ORAC, but were for H-ORAC. The high elevation Central Oregon Plateau tended to engender the highest concentrations of total anthocyanins, however, this was not matched in the concentration of total carotenoids. Colorless compounds present in both hydrophilic and lipophilic phases contribute to the antioxidant levels of certain clones.