. Carotenoids, their comparative biochemistry. Carotenoids. CAROTENOIDS (ii) oL-carotene. Although a-carotene is often associated with fi-carotene in green leaves it is quite frequently absent, for neither spinach, nettle^*, artichoke, nor barley^^ leaves contain a-carotene. 68 per cent, of the species examined by MacKinney^ contained a- carotene in their leaves in amounts varying from " a trace " to 35 per cent, of the total carotene fraction. Kuhn and Lederer's^* earlier value for the a-carotene content of horse-chestnut leaves falls within this range ; similar values are reported
. Carotenoids, their comparative biochemistry. Carotenoids. CAROTENOIDS (ii) oL-carotene. Although a-carotene is often associated with fi-carotene in green leaves it is quite frequently absent, for neither spinach, nettle^*, artichoke, nor barley^^ leaves contain a-carotene. 68 per cent, of the species examined by MacKinney^ contained a- carotene in their leaves in amounts varying from " a trace " to 35 per cent, of the total carotene fraction. Kuhn and Lederer's^* earlier value for the a-carotene content of horse-chestnut leaves falls within this range ; similar values are reported for the leaves of Japanese plants. ®. a-carotene (iii) y-carotene. There is no convincing evidence that y-carotene occurs to any appreciable extent in green leaves except in those of the Californian marsh dodder {Cuscuta salina)^^, in which it is the major carotenoid component; 20-25 mg. of crystalline y-carotene was isolated from 1 kg. of these leaves compared with only 12*5 mg. of p-carotene. Kuhn and Brockmann^^ elucidated the structure of y-carotene:. 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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