. Carotenoids, their comparative biochemistry. Carotenoids. 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:. (iv) cis'isomers. It is obvious that molecules with structures such as the carotenoids possess, have many spatial poss
. Carotenoids, their comparative biochemistry. Carotenoids. 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:. (iv) cis'isomers. It is obvious that molecules with structures such as the carotenoids possess, have many spatial possibilities. Since the other carotenes reported to occur in leaves are stereoisomers of the parent ^-carotene, it will be convenient at this point to discuss briefly the stereochemistry of the carotenoids. Gillam and El Ridi^^ in 1935-6 were the first to draw attention to the lability of carotenoids in solution, and since then Zechmeister ^ • and his co-workers have rehivestigated the problem at great length and in 1944 Zechmeister produced an authoritative review on the subject. The diW-trans form of a carotenoid, the most stable form because of its 8. 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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