Mass spectral analysis of eleven analogs of vitamin A

The low resolution mass spectra of 5,6‐monoepoxyretinoic acid, 5,8‐monoepoxyretinoic acid, 5,6‐monoepoxyretinyl acetate, 5,8‐monoepoxyretinyl acetate, 5,8‐monoepoxyretinal, trimethylsilyl‐5,6‐monoepoxyretinoate, trimethylsilyl‐5,8‐monoepoxyretinoate, methyl‐5,6‐monoepoxyretinoate, methyl‐5,8‐monoepoxyretinoate, β‐C19‐retinal and β‐C19‐retinyl acetate‐analogs of vitamin A—are presented. Characteristic features of the spectra are discussed. In addition, high resolution mass measurements are presented for six fragment ions of all‐trans‐retinoic acid and eleven fragment ions of methyl‐5,6‐monoepoxyretinoate.