2.7. Determination of total anthocyanin contents (TAC)
TAC of extracts was determined by measuring the visible absorbance
at 530 nm against a blank of 10% formic acid in distilled
water. A calibration curve was built with MVG solutions (25,
12.5, 6.25, 3.125 lg/ml in 10% aqueous formic acid). All samples
were diluted in 10% aqueous formic acid until the absorbance
was within the calibration limits. The results are expressed in mg
MVGE/g DW.