Abstract
RETINENE, obtained by Wald from dark-adapted retinas, is defined as the chromogen responsible for a maximum at 664 mµ in the absorption spectrum of the blue solution obtained by mixing retinal extracts with antimony trichloride in chloroform. Such extracts show (in chloroform) an ultra-violet absorption band with λmax.385 mµ. It has recently been suggested1 that the chromogen is vitamin A aldehyde, and that it can be obtained by direct oxidation of vitamin A alcohol.
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