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- W2017793896 abstract "This chapter discusses methodology for the assay and preparation of vitamin A and visual pigments, such as rhodopsin, rod opsin, iodopsin, and cone opsin. The assay for rhodopsin depends upon the fact that rhodopsin bleaches in the light to all-trans retinal and opsin. Opsin has no absorption at wavelengths longer than about 300 nm, but retinal has some absorption in the visible, and this absorption varies with the pH and the purity of the rhodopsin preparation. The assay is therefore best performed in the presence of hydroxylamine that combines with retinal to form retinaldehyde oxime, a compound with essentially no absorption at wavelengths longer than 450 nm. The assay for rod opsin depends upon the fact that opsin combines with its molar equivalent of 11-cis-retinal to form rhodopsin that has characteristic absorption properties. Iodopsin, a cone visual pigment, has been prepared from chicken, pigeon, and sea turtle retinas. As with rhodopsin, a detergent such as digitonin is required to solubilize it. Because all these animals have both rods and cones in their retinas, the extracts contain mixtures of rhodopsin and iodopsin, and the assay must detect iodopsin in the presence of what is usually an excess of rhodopsin." @default.
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- W2017793896 date "1959-02-01" @default.
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- W2017793896 title "On the occurrence of vitamin A aldehydes in fish and frog ova" @default.
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- W2017793896 doi "https://doi.org/10.1016/0006-3002(59)90038-1" @default.
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