Determination of l-cysteine origin on the basis of its δ15N values.
Food Chem
; 260: 283-288, 2018 Sep 15.
Article
em En
| MEDLINE
| ID: mdl-29699671
ABSTRACT
The majority of l-cysteine is obtained industrially by hydrolysis of animal materials, such as poultry feathers. Despite widespread belief, there is little evidence that human hair is used as a source material and its use is explicitly banned in the European Union (2000/63/EC decision). We developed an isotope ratio mass spectrometric (EA-IRMS) method to determine carbon and nitrogen isotopic ratio in cysteine preparations and related compounds, e.g. cystine and carbocysteine. A threshold relying on the 15N/14N was established to differentiate between hair and feathers; a value below 6.6 indicates a poultry feathers origin. Global uncertainty of measurement was found to be 0.1 for δ15N (sample size of 0.5-1.8â¯mg).
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Base de dados:
MEDLINE
Assunto principal:
Espectrometria de Massas
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Cisteína
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Plumas
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Cabelo
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Isótopos de Nitrogênio
Idioma:
En
Ano de publicação:
2018
Tipo de documento:
Article