2 32 



CAROTENOIDS CONTAINING CARBONYL GROUPS 



XII 



Source 

 Cyclopterus lurnpus, liver 

 Lophius piscatorius, liver 

 Perca fluviatilis , fins 

 Regalecus glesne+ liver 



Salmo salar, muscle 

 Salmo trutta'^, muscle 



Sebastes fnarinus, skin 



References 

 N. A. SoRENSEN, Z. physiol. Chem. 235 (1935) 8. 

 N. A. SoRENSEN, Tidskr. Kjemi Bergves 1935, 12. 

 E. Lederer, Bull. Soc. Biol. 20 (1938) 554, 567, 611. 

 N. A. SoRENSEN, Tidskr. Kjemi Bergves 1935, 12. — 

 R. KuHN, J. Stene and N. A. Sorensen, Ber. 72 

 (1939) 1688. 



N. A. Sorensen, Z. physiol. Chem. 235 (1935) 8. 

 N. A. Sorensen and J. Stene, Kgl. Norske Vid. Selsk. 

 Skr. 1938, No. 9. 

 E. Lederer, Bull. Soc. Biol. 20 (1938) 554, 567, 611. 



IX. Reptiles: 



Clemmys insculpata, retina G. Wald and H. Zussman, /. biol. Chem. 122 (1938) 



449. 



X. Birds: 

 Chicken, retina+ 



Phasianus colchicus, 

 'Rosen'+ 



R. KuHN, J. Stene and N. A. Sorensen, Ber. 72 

 (1939) 1688. — . G. Wald and H. Zussman, /. biol. 

 Chem. 122 (1938) 449. 



R. KuHN, J. Stene and N. A. Sorensen, Ber. 72 

 (1939) 1688. — H. Brockmann and O. Volker, Z. 

 physiol. Chem. 224 (1934) 193. 



XI. Mammals: 



Balaenoptera niusculus, Fat S. Schmidt-Nielsen, N. A. Sorensen and B. Trumpy, 



Kgl. Norske Vid. Selsk. Skr. 5 (1932) 118. — G. N. 



Burkhardt, I. M. Heilbron, H. Jackson, E. G. 



Parry and I. A. Lovern, Biochem.J. 28 (1934) 1698. 



The occurrence of astaxanthin in the green algae Haematococcus pluvialis^^ 

 is of especial interest as it disproves the view that astaxanthin is a purely 

 animal carotenoid. 



As early as 1936, Tischer discovered a pigment in the flagellate Euglena 

 heliorubescens^^ , which he termed euglenarhodon. Later he also found this 

 piigment in the green algae Haemato coccus pluvialis^^. Subsequent investigations 

 by KuHN, Stene and Sorensen^^ showed that euglenarhodon from Haemato- 

 coccus pluvialis is identical with astacene. A reinvestigation of the pigment from 

 Euglena heliorubescens by Tischer^^ led to the same result. 



KuHN and his collaborators have recently isolated astaxanthin, as well as 

 j3-carotene, from the eggs of rainbow trout, Salmo irideus, and have shown that 

 astaxanthin is the chemotactic principle responsible for attracting the trout 

 sperms. 

 References p. 253-255, 



