| 释义 |
carotene, carotin|ˈkærətiːn, -ɪn|
[a. G. carotin (H. W. F. Wackenroder 1831, in Mag. Pharmacie XXXIII. 148), f. L. carota carrot + -ene, -in1.]
An orange or red hydrocarbon, C40H56, synthesized in several isomeric forms by carrots and many other plants, and an important source of vitamin A. Also attrib.
1861Mrs. Beeton Bk. Househ. Managem. 563 A peculiar crystallizable ruby-red neuter principle, without odour or taste, called carotin. 1895Naturalist 24 [Berries of mountain ash.] Their colouring matter is due to carotin. 1897Jrnl. Chem. Soc. LXXII. ii. 225 The author does not attempt to decide whether the crystals formed in this reaction are all xanthophyll or all carotin crystals, or whether these are identical or whether they consist in part of colouring matters nearly related to carotene. 1951Science News XXII. 75 Vitamin A..is one half of a carotene molecule and is formed from carotene in the intestinal wall of animals. 1960[see cryptoxanthin].
Hence ˌcaroteˈnæmia (U.S. -nem-), ˌcarotiˈnæmia, the presence of carotene in the circulating blood.
1919A. F. Hess & V. C. Myers in Jrnl. Amer. Med. Assoc. LXXIII. 1745/1 In cases of carotinemia the urine was colored yellow as well as the serum. 1959Listener 11 June 1017/1 Occasional cases of a condition known as carotinaemia were encountered... It arose from an over-indulgence in carrots. |