. Carotenoids, their comparative biochemistry. Carotenoids. ANIMAL CAROTENOIDS fasting and this may be taken to indicate that carotenoids play some part in gametogenesis and/or the gonads act as a reserve store of carotenoids. Contrary to a suggestion of Zechmeister«» it was found that the pigment concentrations of normal and fasted mussel tissue are independent of lipid concentrations. Mussels, kept in a similar environ- ment to that of the fasted animals, were divided into two groups, one of which was fed a carotenoid-free diet and the other a diet of Nitzschia closterium. The animals fed on
. Carotenoids, their comparative biochemistry. Carotenoids. ANIMAL CAROTENOIDS fasting and this may be taken to indicate that carotenoids play some part in gametogenesis and/or the gonads act as a reserve store of carotenoids. Contrary to a suggestion of Zechmeister«» it was found that the pigment concentrations of normal and fasted mussel tissue are independent of lipid concentrations. Mussels, kept in a similar environ- ment to that of the fasted animals, were divided into two groups, one of which was fed a carotenoid-free diet and the other a diet of Nitzschia closterium. The animals fed on A^. closterium increased their concentra- tions of zeaxanthin and mytiloxanthin, the latter being formed probably. Qlycymerin in CSj Mytiloxanchin in C52 • Hopkinsaxanthin in i-ghc I oecroleum \ 440 4ZU 44'J ^50 Wuve length (m^) 520 Fig 25—The absorption spectra of Pectenoxanthin {from Lederer, E. {1938) Bull. Soc. Chim. 20, 611), Glvcymerin {from Fabre, R., and Lederer, E {1934) Bull. Soc. Chim. 16, 105), Mytiloxanthin {from Scheer, 6 T {1940) J. biol. Chem., 136, 275), and Hopkinsiaxanthin (from Strain, H. H. {1949) Biol. Bull. Woods. Hole, 97, 206). by oxidation of alimentary carotenoids, but which of these were involved could not be determined. The mussels on the carotenoid-free diet lost much more pigment than did those that were merely fasted. This in- teresting resuh may be due to the utilization of stored carotenoids by the activities of feeding in a condition of virtual starvation, for body weight data indicated that the carotenoid-free diet was not well absorbed. In the fasted animals no useless energy was expended in " feeding " and the 177. 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 Goodwin, T. W. (Trevor Walworth). New York, Chemical Pub. Co.
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