Métodos de controle químico de amostras de própolis / Chemical control methods of propolis samples

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

22/11/1996

RESUMO

A number of parameters and respective methods of analysis for chemical control of samples and tinctures of propolis is presented. It is suggested the determination of the contents of total phenolics, flavonoids, phenolic acids, waxes, ashes, volatile substances and dry residue for chemical control of samples of crude propolis. For propolis tinctures, in addition to the first four parameters it is proposed the determination of the density and the content of ethyl alcohol. The validity of the proposed methods for quantification of total phenolics, flavonoids and phenolic acids was evaluated by means of analysis of a mixture containing known quantities of several flavonoids and phenolic acids. The percentages of the differences between the actual contents and the measured quantities in the standard mixture remained always below 10,0%. The utility of the proposed methods is shown by the determination of the proposed parameters in samples of crude propolis collected in distinct localities of Brasil, and also in samples of ethanolic and hydroalcoholic tinctures of propolis. Because all assays were conducted as triplicates it was possible to demonstrate that all methods present good reproducibility. The samples of crude propolis assayed showed contents of total phenolics 30% below the average of the values reported for samples of propolis from Europe. The contents of flavonoids are also relatively small when compred with the contents generally reported for samples of propolis from temperate regions.

ASSUNTO(S)

apis mellifera apis mellifera chemical control controle químico farmacognosia farmacognosy flavonóides flavonoids medicamento natural products phenolic substances produtos naturais propolis propolis substâncias fenólicas

ACESSO AO ARTIGO

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