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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 β-carotene as the principal provitamin and (2) those with β-cryptoxanthin as the major provitamin. Some fruits also had α-carotene, γ-carotene, α-cryptoxanthin, and β-apo-10′-carotenal, usually at low levels. cis-Isomers were not found in cajá, papaya (two cultivars), passion fruit, pitanga, and West Indian cherry. Traces of 13-cis-β-carotene were found in some samples of loquat, mango (two cultivars), and piqui. Buriti, mamey, nectarine, and peach had 0.1-4.2 μg/g 13-cis-β-carotene and 0.1-1.0 μg/g 9-cis-β-carotene; the latter two fruits and piqui also had 0.2-0.4 μg/g neo-β-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. © 1994 American Chemical Society.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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