Comparative Analysis of the Distribution of Copper in Green and Brown Brazilian Propolis Extracts
We proposed here a novel analytical procedure for copper speciation in green and brown propolis extracts using SEC—HPLC—GFAAS with 0.5% m v−1 SDS in 2.5 m mol L−1 Tris–HCl (pH 7.4) as the mobile phase buffer solution. Both basic (0.05 mol L−1 NaOH) and acid (0.05 mol L−1 HCl) conditions were evaluated for sample extraction. Depending on the extraction procedure, differences in copper distribution were identified. Copper was mainly associated with high-molecular-weight (HMW) fractions in green propolis extract when extracted with basic solution, whereas with acid extraction solution, only low-molecular-weight (LMW) fractions were obtained in both samples. Furthermore, combined analysis of results obtained using SEC-UV and GF AAS confirmed the association of copper with LMW and HMW species.
KeywordsPropolis Fractionation Copper SEC on-line UV detection SEC off-line GF AAS
The authors are grateful to the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) and Fundação de Amparo à Pesquisa do Estado do Pará (FAPESPA) for financial support. KGF, PON (Grant CNPq Nº 551983/2009-4) and JAN also thank the CNPq for providing research and fellowship support.
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Conflict of interest
The authors declare that they have no conflict of interest.
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