BF_3試液によるビタミンAの呈色

概要

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Investigations were made on the blue color reaction of vitamin A with BF_3-etherate which disappeared in a few minutes. The substance developing blue color had absorption maxima at 600 and 430 mμ. The maximum absorption at 600 mμ rapidly disappeared, while that at 430 mμ was relatively stable. Since the absorption spectrum of the coloring substance obtained by the reaction with BF_3 reagent followed by decomposition with water well resembled those in case of SbCl_3 and GDH in the respect that in every case absorption maxima were observed at 330,350,and 370 mμ, the mechanism of color reaction of vitamin A seems to be common to all the three reagents. A marked absorption maximum was recognized at 292 mμ when the molar ratio of BF_3-etherate to vitamin A was low. Since the phenomenon is supposed to be due to some intermediate products, further investigation is in progress.
日本ビタミン学会の論文