アントシアニン色素の安定化とその有効利用　ＩＩ　　酸性溶液中におけるアントシアニン色素および関連化合物の安定性

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タイトル別名
  • Stability of Anthocyanin Pigments and Related Compounds in Acidic Solutions
  • サンセイ ヨウエキチュウ ニ オケル アントシアニン シキソ オヨビ カンレン

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Using four anthocyanin pigments from Bailey Alicante A grapes and thirteen synthetic flavylium salts, the effects of two substituent groups(hydroxyl and methoxyl)on the stability of the pigment molecules have been studied in 0.2M tartaric acid-sodium tartrate buffer solutions(pH 2.5-4.5)at 50°C.(1)The pK values of the seventeen compounds investigated were determined spectrophotometrically.(2)The pigment molecules were stabilized by hydroxylation at the 5 and 7-positions in the benzopyrylium ring, and labilized by the same modification at the 3-position.(3)Since the instability of the pigment molecules increased with increasing hydroxylation in the B-ring(3', 4', and 5' -positions), it was suggested that the anthocyains hydroxylated at the ortho-position such as delphinidin-type pigments were labile.(4)The stability of the pigment molecules increased with increasing methoxylation in the B-ring.(5)From these results, it was proved that the malvidin-type pigments were the most stable.

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