抄録
The authors have devised a simple method to reduce and decolorize the artificial dyes, yellow AB and OB, in the unsaponifiable fraction of margarine by treating the petroleum ether solution with glacial acetic acid and sodium hydrosulfite. Applying this method, the vitamin A in margarine which did not contain carotenoides, could be determined easily. The recovery of vitamin A throughout the whole procedure was over 93%. In this determination, yellow AB was found to be reduced to 1,2-naphthylenediamine and aniline by sodium hydrosulfite.
