TMA were quantified by pH-differential method according to Giusti and Wrolstad (2001) with the use of above-mentioned
equipment. Extracts of blueberries (n = 3) were diluted with two buffer solutions at pH 1 and 4.5. Cyanidin-3-glucoside (Cy-3-G) (MW = 449.2 g mol1) was used as a standard with a molar absorptivity coefficient of 26,900 L mol1 cm1. The results were expressed as g Cy-3-G 100 g1 DM.