Sr isotope measurements in beef-analytical challenge and first results.
Anal Bioanal Chem
; 402(9): 2837-48, 2012 Mar.
Article
em En
| MEDLINE
| ID: mdl-22311428
ABSTRACT
The strontium isotope ratio ((87)Sr/(86)Sr) in beef, derived from 206 European cattle, has been measured. These cattle were located in 12 different European regions within France, Germany, Greece, Ireland, Italy, Spain and the UK. As animal protein is known to be a difficult material on which to conduct Sr isotope analysis, several investigations were undertaken to develop and improve the sample preparation procedure. For example, Sr isotope analysis was performed directly on freeze-dried meat and defatted dry mass from the same samples. It was found that enormous differences-sometimes exceeding the measurement uncertainty-could occur between the fractions and also within one sample even if treated in the same manner. These variations cannot be definitely allocated to one cause but are most likely due to inhomogeneities caused by physiological and biochemical processes in the animals as post mortem contamination during analytical processing could be excluded. For further Sr isotope measurements in meat, careful data handling is recommended, and for the authentic beef samples within this project, it was decided to use only freeze-dried material. It can be demonstrated, however, that Sr isotope measurements in beef proteins are a valuable tool for authentication of geographic origin. Although partly overlapping, some of the European sampling sites could be discriminated even by only using (87)Sr/(86)Sr.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Isótopos de Estrôncio
/
Contaminação Radioativa de Alimentos
/
Análise de Alimentos
/
Carne
Tipo de estudo:
Evaluation_studies
Limite:
Animals
País/Região como assunto:
Europa
Idioma:
En
Revista:
Anal Bioanal Chem
Ano de publicação:
2012
Tipo de documento:
Article
País de afiliação:
Alemanha