Determination of l -cysteine origin on the basis of its δ 15 N values. Bichon, E.; Sitthisack, P.; Sérée-Vattier, L.; Prévost, S.; Schiphorst, A.; Pouponneau, K.; Monteau, F.; and Le Bizec, B. 260:283–288.
Determination of l -cysteine origin on the basis of its δ 15 N values [link]Paper  doi  abstract   bibtex   
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 0.5–1.8 mg).
@article{bichon_determination_2018,
	title = {Determination of l -cysteine origin on the basis of its δ 15 N values},
	volume = {260},
	issn = {03088146},
	url = {https://linkinghub.elsevier.com/retrieve/pii/S0308814618305818},
	doi = {10.1016/j.foodchem.2018.03.139},
	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 0.5–1.8 mg).},
	pages = {283--288},
	journaltitle = {Food Chemistry},
	author = {Bichon, Emmanuelle and Sitthisack, Parina and Sérée-Vattier, Ludivine and Prévost, Stéphanie and Schiphorst, Anne-Marie and Pouponneau, Karinne and Monteau, Fabrice and Le Bizec, Bruno},
	urldate = {2019-03-29},
	date = {2018-09},
	langid = {english},
	file = {Bichon et al. - 2018 - Determination of l -cysteine origin on the basis o.pdf:C\:\\Users\\ygu\\Documents\\PCPOR066_YGU\\YGU\\Zotero\\storage\\VVJEHL49\\Bichon et al. - 2018 - Determination of l -cysteine origin on the basis o.pdf:application/pdf}
}
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