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
. Th