Artigo de Periódico
Evaluation of sample preparation (grinding and sieving) of bivalves, coffee and cowpea beans for multi-element analysis
Fecha
2008Registro en:
0026-265X
v. 89, v. 2
Autor
Santos, Wagna Piler Carvalho dos
Hatje, Vanessa
Lima, Leonardo Nascimento
Trignano, Stefano Valente
Barros Junior, Francisco Carlos Rocha de
Castro, Jacira Teixeira
Korn, Maria das Graças Andrade
Santos, Wagna Piler Carvalho dos
Hatje, Vanessa
Lima, Leonardo Nascimento
Trignano, Stefano Valente
Barros Junior, Francisco Carlos Rocha de
Castro, Jacira Teixeira
Korn, Maria das Graças Andrade
Institución
Resumen
Elemental analyses of food samples require several pre-treatment steps that constitute a great potential source of errors. In this study, the influence of cryogenic, ball and knife mill devices and also sieving using different sizes of sieve (100, 300 and 500 μm) was evaluated for samples of bivalves, coffee and cowpea beans. A two-factor ANOVAwas performed in each sample to test for differences between macro, micro and trace element concentrations determined by ICP OES. Results showed that the efficiency of the particle size reduction and sample homogeneity depends on the milling device and the nature of samples. Food samples may present segregation after comminution, and sieving might become a necessary step. Nevertheless, the sieve aperture has to be chosen cautiously, once it might influence the final element concentration. Overall, the expected results by employing cryogenic grinding, such as rapid sample homogenization and small particle size generated were also observed for ball mill.
Contamination can be a critical issue for some elements and need to be evaluated individually.© 2008 Elsevier B.V. All rights reserved.