Journal
FOOD CHEMISTRY
Volume 169, Issue -, Pages 314-319Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2014.07.144
Keywords
Milk; Melamine; Cloud point extraction; Triton X-114; Fluorescence; Adulteration
Funding
- Brazilian agency Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- Brazilian agency Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)
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An environmental friendly procedure was developed for fast melamine determination as an adulterant of protein content in milk. Triton X-114 was used for sample clean-up and as a fluorophore, whose fluorescence was quenched by the analyte. A linear response was observed from 1.0 to 6.0 mg L-1 melamine, described by the Stern-Volmer equation I degrees/I = (0.999 +/- 0.002) + (0.0165 +/- 0.004) C-MEL (r = 0.999). The detection limit was estimated at 0.8 mg L-1 (95% confidence level), which allows detecting as low as 320 mu g melamine in 100 g of milk. Coefficients of variation (n = 8) were estimated at 0.4% and 1.4% with and without melamine, respectively. Recoveries to melamine spiked to milk samples from 95% to 101% and similar slopes of calibration graphs obtained with and without milk indicated the absence of matrix effects. Results for different milk samples agreed with those obtained by high performance liquid chromatography at the 95% confidence level. (C) 2014 Elsevier Ltd. All rights reserved.
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