C. Garcia-viguera et P. Bridle, Influence of structure on colour stability of anthocyanins and flavylium salts with ascorbic acid, FOOD CHEM, 64(1), 1999, pp. 21-26
Ascorbic acid (330 mg/l) was added to buffered solutions (pH 2.35) of malvi
din 3-glucoside, malvidin 3,5-diglucoside and flavylium salts with differin
g 4-substituents, viz.: 5,7-dihydroxy-4'-methoxyflavylium chloride, 5,7-dih
ydroxy-4-methyl-4'-methoxyflavylium chloride and 5,7-dihydroxy-4-phenyl-4'-
methoxyflavylium chloride. Malvidin 3,5-diglucoside lost colour slower than
malvidin 3-glucoside and flavylium colour stability was in the order 4-phe
nyl > 4-methyl > 4-H. The results demonstrate that anthocyanin reactivity a
nd the status of the flavylium 4-substituent play an important role in colo
ur stability under these conditions. (C) 1998 Elsevier Science Ltd. All rig
hts reserved.