کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5551030 | 1402937 | 2017 | 6 صفحه PDF | دانلود رایگان |
A new postchemiluminescence (PCL) reaction was observed when urea was injected into the reaction mixture after the CL reaction of N-bromosuccinimide and dichlorofluorescein. A possible reaction mechanism was proposed based on the studies of the CL kinetic characteristics, CL spectra, fluorescence spectra, and other experiments. A new flow injection CL method for the determination of urea was established based on the PCL reaction. The relative standard deviation for the determination of urea was 1.3% (n = 11, c = 5.0 Ã 10â8 g/mL). The CL intensity responded linearly to the concentration of urea in the range 2.0 Ã 10â9-1.0 Ã 10â6 g/mL (r = 0.9992). The detection limit was 7 Ã 10â10 g/mL. The method had been applied to the determination of urea in milk with satisfactory results.
The proposed method provides a simple and ultrasensitive methodology for the determination of urea in milk using a postchemiluminescence system of the NBS-dichlorofluorescein-urea.111
Journal: Journal of Food and Drug Analysis - Volume 25, Issue 3, July 2017, Pages 472-477