Identificação de pigmentos naturais utilizando-se cromatografia em papel
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Data
2002
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Resumo
The use
of natural dyes to demonstrate principles of paper chromatography is proposed. Extraction of the coloring compounds were
performed in order to obtain the aglycone form of the anthocyanins present in the crude extracts. Separations were carried out
on chromatographic paper with BAW (butanol/acetic acid/water) as mobile phase and the results compared with literature data.
The crude extracts were obtained from Tibouchina granulosa, Rododhendron simsii, Impatiens walleriana flowers which are
wildely found in Brazil and Phaseolus vulgaris L. grains skin which is the principal ingredient of the world famous “feijoada”.
Such species were chosen in order to attract the students attention since they are present in their quotidian, in agreement with the
new proposals for Brazilian education.
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Palavras-chave
Paper chromatography teaching, Anthocyanins, Chemical education
Citação
OKUMURA, Fabiano; SOARES, Márlon Herbert Flora Barbosa; CAVALHEIRO, Éder Tadeu Gomes. Identificação de pigmentos naturais utilizando-se cromatografia em papel. Química Nova, São Paulo, v. 25, n. 4, p. 680-683, 2002.