The black chokeberry - also known as aronia berries - has attracted scientific interest due to its deep purple, almost black pigmentation which arises from dense contents of phenolic phytochemicals, especially anthocyanins. Total anthocyanin content in chokeberries is 1480 mg per 100 g of fresh berries, and proanthocyanidin concentration is 664 mg per 100 g (Wu et al. 2004, 2006). Both values are among the highest measured in plants to date.
USDA Database for the Oxygen Radical Absorbance Capacity (ORAC) of Selected Foods, Release 2 - Prepared by Nutrient Data Laboratory, Beltsville Human Nutrition Research Center (BHNRC), Agricultural Research Service (ARS), U.S. Department of Agriculture (USDA) - May 2010USDA Plant Guide for Symbol ARME6: Black Chokeberry (PDF) May 2005