Anthocyanin standards: Cyanidin-3-diglucoside-5 glucoside
and Cyanidin 3, 5 diglucoside were obtained from Carl
Roth GmbH D-76185 Karlsruhe, Germany.
Butylated hydroxy toluene (BHT) and solvents used for
spectral and HPLC analyses were of HPLC grade and were
purchased from Sigma Chemical Company USA.