The daily consumption of blueberries and other antioxidant-rich fruits is often limited by seasonal availability, market accessibility and cost and time constraints; in addition, frozen and thermally processed products may be selected over fresh products because of the greater convenience. There is currently not sufficient knowledge about the anthocyanidin content of thermally processed fruits. Few papers have reported the quantification of anthocyanidins or the effects of food processing on these molecules. The preservation of anthocyanins is of great interest because the degradation of these compounds may considerably affect the color, the sensorial acceptance and the nutritional value of the fruit and the food products containing anthocyanin-rich fruits