Simultaneous Analysis of Nε‐(Carboxymethyl)Lysine and Nε‐(Carboxyethyl)Lysine in Foods by Ultra‐Performance Liquid Chromatography‐Mass Spectrometry with Derivatization by 9‐Fluorenylmethyl Chloroformate |
| |
| Authors: | Yanqiong Zhou Qin Lin Cheng Jin Lu Cheng Xiaoyan Zheng Ming Dai Ying Zhang |
| |
| Affiliation: | 1. Dept. of Food Science and Nutrition, College of Biosystems Engineering and Food Science, Zhejiang Univ, Hangzhou, PR China;2. with Fujian Inspection and Research Inst. for Product Quality, Fuzhou, PR China |
| |
| Abstract: | Isotope dilution ultra‐performance liquid chromatography–electrospray tandem mass spectrometry with derivatization by 9‐fluorenylmethyl chloroformate was successfully applied to quantify Nε‐(carboxymethyl)lysine (CML) and Nε‐(carboxyethyl)lysine (CEL) in processed foods. We demonstrate that this analytical method is well validated for the determination of CML and CEL contents in processed foods. Relative standard deviations (RSD) indicate repeatability (RSD < 6% for CML and CEL) and reproducibility (RSD < 6% for CML and < 7% for CEL) in this method. Percent recovery is also good. We obtain recoveries of 102% to 112% for CML and 86% to 114% for CEL. CML levels detected in the samples vary from 2.29 to 480 mg/kg food, whereas CEL is detected in significantly lower concentrations ranging from 0.56 to 107 mg/kg food. These data could help consumers make better food choices by monitoring intake of advanced glycation end‐products, which may pose a risk to human health. |
| |
| Keywords: | FMOC‐Cl derivatization Nε ‐(carboxyethyl)lysine (CEL) Nε ‐(carboxymethyl)lysine (CML) processed foods UPLC– MS/MS |
|
