CAROTENOIDS 



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30. HiLBERT, G. E., and Jansen, E. F. (1934), J. biol. Chem., 106, 97. 



31. ZiMMERMANN, J. (1932), Rec. trav. Mm. Pays. Bos., 51, 1001. 



32. Zechmeister, L., and TUZSON, P. (1934), Naturtviss, 19, 307. 



33. Vermast, p. G. F. (1931), Naturtvtss, 19, 442. 



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42. Zechmeister, L., and Szilard, K. (1930), Hoppe-Seyl. Z., 190, 67. 



43. Gill, A. H., and Greenup, J. (1929), Dil. Fat Ind., 5, 288. 



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47. Karrer, P., and Schlientz, W. (1934), Helv. Ckim. Acta, 17, 7. 



48. Willstaedt, H. (1936), Svensk. kem. Tidskr., 48, 212. 



49. SchOn, K. (1935), Biochem. Jf., 29, 1782. 



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52. SchOn, K. (1935), Biochem. J., 29, 1779. 



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61. Zechmeister, L., and Tuzson, P. (1934), Ber. deutsch. chem. Ges., 67, 824. 



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70. Zechmeister, L., and Cholnoky, L. v. (1934), LieHgs Ann., 509, 269. 



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72. SchOn, K. (1938), Biochem. y., 32, 1566. 



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75. Karrer, P., and Jucker, E. (1947), Helv. Chim. Acta, 30, 266. 



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The most important feature which emerges from this list of xantho- 

 phylls in fruit is the first appearance of two new types of carotenoids, 

 (a) those containing a carbonyl group : rhodoxanthin, capsorubin, and 

 capsanthin and (b) those in which an oxygen atom is incorporated into 

 a furan ring (a 5 : 8-epoxide), mutatochrome. With regard to rhodo- 

 xanthin, it should be pointed out that an unconfirmed report exists 

 indicating that it occurs in the leaves of Haworthia coarctata v. Krausii 

 and Ceratozamia tnexicana,^^^ {see also p. 17). 



38 



