Data/hora: 09/06/2024 17:50:17

Biblioteca(s): 	Embrapa Pecuária Sudeste.	
Data corrente: 	06/04/2020	
Data da última atualização: 	20/04/2020	
Autoria: 	MIHAI, O.; KAWAMOTO, M. S.; LEBLANC, K. L.; GRINBERG, P.; NOGUEIRA, A. R. de A.; MESTER, Z.	
Afiliação: 	Ovidiu Mihai, National Research Council Canada; Mayumi S. Kawamoto, National Research Council Canada; Kelly L. LeBlanc, National Research Council Canada; Patricia Grinberg, National Research Council Canada; ANA RITA DE ARAUJO NOGUEIRA, CPPSE; Zoltán Mester, National Research Council Canada.	
Título: 	Determination of chromium picolinate and trace hexavalent chromium in multivitamins and supplements by HPLC-ICP-QQQ-MS.	
Ano de publicação: 	2020	
Fonte/Imprenta: 	Journal of Food Composition and Analysis, v. 87, 2020, 103421.	
ISSN: 	0889-1575	
DOI: 	https://doi.org/10.1016/j.jfca.2020.103421	
Idioma: 	Inglês	
Conteúdo: 	Chromium picolinate (CrPic) and trace hexavalent chromium (Cr(VI)) content were characterized in VITA-1 and VITB-1, two new multivitamin and mineral supplement candidate reference materials from National Research Council Canada, by two methods of high performance liquid chromatography inductively-coupled plasma triple quadrupole mass spectrometry. The conditions for the separation of Cr(VI) from EDTA-complexed Cr(III) were optimized such that species interconversions were not observed during analysis. Following extraction with dilute NH4OH in water at pH 10 (for Cr(VI)) or 3:2 acetonitrile:water (for CrPic) and quantification by standard addition, it was concluded that CrPic accounted for 95?96 % of the Cr in VITA-1 and VITB-1, while Cr(VI) was not present above the detection limit of 0.13 ?g Cr g?1. Using the two developed methodologies, commerciallyavailable nutritional supplements, in the form of vitamin tablets and dried food supplements, were assessed, and it was determined that CrPic accounted for the majority (92 %?98 %) of the chromium present in the tablets, and that Cr(VI) concentrations were below the detection limit for all samples except for the powdered beets where it accounted for nearly half of the total Cr present.	
Palavras-Chave: 	Chromium picolinate; Hexavalent chromium; Inductively coupled plasma mass spectrometry.	
Thesaurus Nal: 	High performance liquid chromatography; Ion exchange chromatography.	
Categoria do assunto: 	W Química e Física	
Registro original: 	Embrapa Pecuária Sudeste (CPPSE)	
Exemplares: 	CPPSE - (25099-1) - UPC - AP - DD - PROCI-2020.00026 - MIH - 2020.00071 - DIS