کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7585071 | 1492032 | 2018 | 17 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Determination of l-cysteine origin on the basis of its δ15N values
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
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چکیده انگلیسی
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 6.6â° indicates a poultry feathers origin. Global uncertainty of measurement was found to be 0.1â° for δ15N (sample size of 0.5-1.8â¯mg).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Food Chemistry - Volume 260, 15 September 2018, Pages 283-288
Journal: Food Chemistry - Volume 260, 15 September 2018, Pages 283-288
نویسندگان
Emmanuelle Bichon, Parina Sitthisack, Ludivine Sérée-Vattier, Stéphanie Prévost, Anne-Marie Schiphorst, Karinne Pouponneau, Fabrice Monteau, Bruno Le Bizec,