. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. XANTHOPHYLLS AND CAROTENES OF ALGAE 173 lability of the pigments, the small quantities obtained, and the presence of colorless concomitants, determination of the specific absorption coefficients was not feasible. Relative absorption values were always determined within a few hours after puri- fication of the pigments by adsorption. RESULTS XaiitJiophylls of duttoins. All the diatoms yielded the same series of xantho- phyll pigments shown in Figure 1. However, different species showed significant variations in the relative am
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. XANTHOPHYLLS AND CAROTENES OF ALGAE 173 lability of the pigments, the small quantities obtained, and the presence of colorless concomitants, determination of the specific absorption coefficients was not feasible. Relative absorption values were always determined within a few hours after puri- fication of the pigments by adsorption. RESULTS XaiitJiophylls of duttoins. All the diatoms yielded the same series of xantho- phyll pigments shown in Figure 1. However, different species showed significant variations in the relative amounts of the pigments. • DIATOXANTHIN o ZEAXANTHIN • DIADINOXANTHIN o LUTEIN NEODIADINOXANTHIN. _L 400 450 500 FIGURE 2. Characteristic spectral absorption curves of diatoxanthin, zeaxanthin, diadinoxan- thin. luetin and ncodiadinoxanthin. Solvent ethanol (95 per cent). Diatoxanthin, a new xanthophyll. formed a paler but distinctly more orange band than the pigment adsorbed above it. Purified by readsorption, diatoxanthin yielded the spectral absorption curve shown with the similar zeaxanthin curve (Strain, 1938a) in Figure 2. When dissolved in ether and treated with concentrated hydrochloric acid, dia- toxanthin did not yield colored products. A mixture of diatoxanthin and zeaxan-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
