$pH;1.7{sim}6.0$범위(範圍)의 acetate buffer 용액중(溶液中)에서 cyanidin-3-glucoside와 $Fe^{3+}$이온간(間)에 형성(形成)된 complex에 대(對)한 분광학적(分光學的) 시험(試驗)을 하였다. cyanidin-3-glucoside와 $Fe^{3+}$이온은 $pH3{sim}4$ 및 $5{sim}6$ 범위(範圍)에서 각각(各各) 543nm 및 570nm에 흡수극대파장(吸收極大波長)을 갖는 두 가지 Complex를 형성(形成)하였다. 그리고 $pH3{sim}4$에서 형성(形成)된 complex의 anthocyanin-Fe의 분자비(分子比)는 1 : 1임을 확인(確認)할 수 있었으나, $pH5{sim}6$에서는 확실하지 않았다. 시험(試驗)한 몇 가지 유기산(有機酸)들 중(中) citric acid는 Fe-anthocyanin complex 형성(形成)에 대(對)하여 현저한 저해효과(阻害效果)를 주었다.
The Fe complex formation of cyanidin-3-glucoside in acetate buffer solution $(pH1.7{sim}6.0)$ was investigated spectrophotometically. Two different complexes were formed from cyanidin-3-glucoside and $Fe^{3+}$, which had the absorption maximum at 543nm in the pH range $3.0{sim}4.0$ and at 570nm in the pH range $5.0{sim}6.0$ respectively. The molar ratio of the complex formed in the lower pH range was appeared to be 1 : 1, whereas that of the complex formed in the upper pH range was not able to be determined definitely. Among several organic acids examined, citric acid has shown the marked inhibitory effect on the Fe-anthocyanin complex formation.
