期刊
JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
卷 878, 期 25, 页码 2333-2338出版社
ELSEVIER
DOI: 10.1016/j.jchromb.2010.07.003
关键词
Molecularly-imprinted polymers; Microsphere; Melamine; Solid-phase extraction; Gas chromatography-mass spectrometry
资金
- National Natural Science Foundation of China [30771577, 20775007]
Molecularly-imprinted polymers in the form of microspheres were synthesized using the dispersion polymerization protocol: cyromazine was used as dummy template, while methacrylic acid, ethylene glycol dimethacrylate and acetonitrile (MeCN) were used as functional monomer, cross-linker, and porogen, respectively. When compared with the non-imprinted polymer, the molecularly-imprinted polymers (MIPs) showed outstanding affinity toward melamine in MeCN with a maximum binding concentration (B-max) of 53.20 nmol mg(-1) MIPs, imprinting effect of 4.6, and a dissociation constant (K-d) of 90.45 mu M. After optimization of the molecularly-imprinted solid-phase extraction conditions, a new method was developed to determine the melamine in milk and feed with gas chromatography-mass spectrometry. The performance of this method has been evaluated in the tainted milk and feed in terms of recovery, precision, linearity, the limit of detection (LOD) and limit of quantitation (LOQ). Recovery ranged in samples from 93.1 to 101.3% with intra-day and inter-day relative standard deviation values below 5.34%. The LOD and LOQ of melamine in milk and feed were 0.01 mu g mL(-1) (mu g g(-1)) and 0.05 mu gmL(-1) (mu g g(-1)), respectively. Crown Copyright (C) 2010 Published by Elsevier B.V. All rights reserved.
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