. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. XANTHOPHYLLS AND CAROTENES OF ALGAE 177 inent, which exhibited spectral properties similar to those of violaxanthin, was ob- served again between the fucoxanthin and the neofucoxanthin B. If, however, the adsorbed pigments were washed with petroleum ether containing about 5 per cent acetone, the yellow band continued to advance ahead of the fucoxanthin, occasionally separating into two contiguous yellow bands. Pigment from the lower of these two yellow bands resembled the violaxanthin of leaves (Strain, 1938a), as is shown b
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. XANTHOPHYLLS AND CAROTENES OF ALGAE 177 inent, which exhibited spectral properties similar to those of violaxanthin, was ob- served again between the fucoxanthin and the neofucoxanthin B. If, however, the adsorbed pigments were washed with petroleum ether containing about 5 per cent acetone, the yellow band continued to advance ahead of the fucoxanthin, occasionally separating into two contiguous yellow bands. Pigment from the lower of these two yellow bands resembled the violaxanthin of leaves (Strain, 1938a), as is shown by the spectral absorption curves in Figure 4. Pigment from the upper yellow band exhibited a spectral absorption curve which (when corrected for absorption due to remaining violaxanthin) resembled the spectral curve of the flavoxanthin of leaves VIOLAXANTHIN • from pansies o from brown algae VIOLAXANTHIN • from pansies o from jreen leaves FLAVOXANTHIN. 400 450 FIGURE 4. Characteristic spectral absorption curves of flavoxanthin and of violaxanthin from pansies, leaves and brown algae. Solvent, ethanol (95 per cent). (Strain, 1938a). This flavoxanthin-like xanthophyll occurred in such small quan- tities that it could not be compared in other respects with the similar pigment of leaves. The violaxanthin-like pigment from brown algae was found to be spectro- scopically identical with violaxanthin prepared from leaves and from pansy flowers as described below (Fig. 4). Violaxanthin preparations from the several sources were also chromatographically identical. Mixtures of these preparations were in- separable by adsorption upon columns of magnesia (petroleum ether with 25 per cent acetone as wash liquid) or by adsorption upon columns of sugar (petroleum ether with per cent ;;-propanol as wash liquid).. 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 ma
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
