Vitamin D
2 and vitamin D
3 gave a single reduction-wave, respectively, in polarography in acetonitrile containing 0.05 M-tetrabutylammonium iodide. The reduction-wave of vitamin was indistinguishable from that of vitamin D2, whose half-wave potentials were evaluated identically at -2.1
0 V vs. Hg. Proportionalities between wave-height and concentration were in the concentration range from 4×10
-4 M (ca. 6000 IU·Eml
-1) to 1.2×10M (ca. 18000 IUD·ml
-1).
In both cases, the conjugated three double-bond system may be reduced to two doublebond system, which corresponds to the third reduction-step of vitamin A.
Ergosterol which has a conjugated two double-bond system and an isolated double-bond gave no reduction-wave under the present conditions.
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