NMR Data and Confirmational Analysis of Isomers of 3-Dehydro-beta-Ionone, a Model Compound of Vitamin A2

Abstract

The absorption of light by the photoreceptor cells in the retina initiates the processes of visual perception. There are two types of receptor cells, the rod cells, which are responsible for vision in dim light, "night vision", and the cone cells, which are responsible for color vision. Rod and cone cells contain light-sensitive pigment in their outer membranes called rhodopsin and iodopsin, respectively. Because of the greater preponderance of rod cells present in most animals, most of the visual pigment studies are limited to those of the rod cells.