Stereochemical configuration and provitamin a activity; a comparison of all-trans-gamma-carotene and pro-gamma-carotene with all-trans-beta-carotene in the chick

Greenberg, S.M.; Calbert, C.E.; Pinckard, J.H.; Deuel, H.J.; Zechmeister, L.

Archives of Biochemistry 24(1): 31-39


ISSN/ISBN: 0096-9621
PMID: 15408892
Accession: 025522456

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Chicks were successfully used in a growth expt. to determine vit. A potency of provit. A. In the chick, pro-gamma-carotene was found to have a provit. A potency of 51% while all-trans-gamma-carotene (prepared by stereoisomerization of pro-gamma-carotene) had a potency of 42% of that of all-trans-beta-carotene. The results obtained with the chick are in close agreement with those obtained in rat growth studies where the potency of this poly-cis carotenoid was shown to be as great or greater than that of the corresponding poly-trans compound.