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|Type:||Artigo de periódico|
|Title:||Evaluation Of Methodologies For The Determination Of Provitamins A [avaliacao De Metodologias Para A Determinacao De Pro-vitaminas A]|
|Abstract:||Many analytical methods have been developed with the purpose of establishing a simple, rapid and economic procedure for determining the provitamins A in foods. In the present study, three methods were assessed: those of COST91, IVACG and RODRIGUEZ-AMAYA et alii simplied. Kale, carrot, papaya and tomato were chosen as food samples because of their distinct characteristics in terms of the provitamin A composition. Incomplete extraction and drastic saponification were the principal deficiencies of the COST91 method. In addition, α- and β-carotene eluted together and β-cryptoxanthin and δ-carotene were not considered. For the IVACG method, the extraction was insufficient only for kale; it was more versatile than that of COST91 since the different provitamins were separated. Of the different saponification procedures, cold saponification was confirmed to be the best technique. The RODRIGUEZ-AMAYA et alii simplified method proved to be the method of choice, principally for its simplicity and accuracy.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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