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|Type:||Artigo de periódico|
|Title:||OCCURRENCE OF CIS-ISOMERS OF PROVITAMIN-A IN BRAZILIAN FRUITS|
|Abstract:||Brazil has a wide variety of tropical, subtropical, and temperate fruits with widely differing carotenoid compositions, providing a good setting for investigating the natural;occurrence of cis-isomers of provitamins. Seventy-five samples were analyzed. The fruits could be classified into two main groups: (1) those having beta-carotene as the principal provitamin and (2) those with beta-cryptoxanthin as the major provitamin. Some fruits also had alpha-carotene, gamma-carotene, alpha-cryptoxanthin, and beta-apo-10'-carotenal, usually at low levels. cis-Isomers were not found in caja, papaya (two cultivars), passion fruit, pitanga, and West Indian cherry. Traces of 13-cis-beta-carotene were found in some samples of loquat, mango (two cultivars), and piqui. Buriti, mamey, nectarine, and peach had 0.1-4.2 mu g/g 13-cis-beta-carotene and 0.1-1.0 mu g/g 9-cis-beta-carotene; the latter two fruits and piqui also had 0.2-0.4 mu g/g neo-beta-cryptoxanthin. Overestimations of only 3-10% of the retinol equivalents occurred when the isomers were not separated, indicating that this separation is not important in fresh fruits.|
|Editor:||Amer Chemical Soc|
|Citation:||Journal Of Agricultural And Food Chemistry. Amer Chemical Soc, v. 42, n. 6, n. 1306, n. 1313, 1994.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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