Entity

Time filter

Source Type

Belo Horizonte, Brazil

Nascimento R.S.,Federal University of Minas Gerais | Froes R.E.S.,Fundacao Ezequiel Diaz | e Silva N.O.C.,Fundacao Ezequiel Diaz | Naveira R.L.P.,Fundacao Ezequiel Diaz | And 2 more authors.
Analytical Letters | Year: 2010

A fast procedure to determine essential and toxic metals in Brazilian human milk by ICP OES is proposed. Mature and colostrum human milk samples were mineralized using closed-pressurized and high-performance microwave digestion oven. Aqueous calibration was performed for all analytes investigated. A reference material, Infant Formula, was analyzed to test the accuracy of the proposed methodology. Recovery rates ranged between 83 and 117%. The precision of the method was better than 3.3% (R.S.D.) for all analytes investigated. Higher concentrations, on average, of the metals studied in the colostrum human milk could be found in relation to the mature human milk. © Taylor & Francis Group, LLC. Source


Nascimento R.S.,Federal University of Minas Gerais | Froes R.E.S.,Fundacao Ezequiel Diaz | e Silva N.O.C.,Fundacao Ezequiel Diaz | Naveira R.L.P.,Fundacao Ezequiel Diaz | And 3 more authors.
Talanta | Year: 2010

In this study we compared the use of ordinary least squares and weighted least squares in the calibration of the method for analyzing essential and toxic metals present in human milk by ICP-OES, in order to avoid systematic errors in the measurements used. Human milk samples were provided by maternity clinic Odete Valadares and digested by means of a high-performance microwave (MW) oven. Evaluation of plasma short and long-term stability was made using a solution of digested milk (1:50) with 2.0 mg L -1 Mg in HNO 3 2% (v/v). The detection power resulted to be at or below the μg L -1 level, whilst the precision expressed as relative standard deviation R.S.D. was almost always equal to or better than 3.3%. Certified reference material Infant Formula (NIST SRM 1846) was used to assess the accuracy of the proposed method, which proved to be accurate and precise. Recovery rates were in the range of 83-117%. Aqueous calibration was carried out for each element under study. © 2009 Elsevier B.V. All rights reserved. Source

Discover hidden collaborations