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Flow Injection Chemiluminescence Determination of Sudan I in Hot Chilli Sauce

2007; American Chemical Society; Volume: 55; Issue: 3 Linguagem: Inglês

10.1021/jf063332h

1520-5118

Yanhong Liu, Zhenghua Song, Fa‐Xin Dong, Lin Zhang,

Spectroscopy and Chemometric Analyses

A chemiluminescence method based on the luminol−H2O2 system with flow injection technology was proposed for the determination of sudan I in hot chilli sauce. It was found that sudan I could enhance chemiluminescence intensity generated from the luminol−H2O2 system. The increment of chemiluminescence intensity was proportional to the concentration of sudan I, giving a calibration graph linear over the concentration from 10 pg mL-1 to 7 ng mL-1 (R 2 = 0.9980) with the detection limit of 3 pg mL-1 (3σ) and the quantification limit of 7.5 pg mL-1. At a flow rate of 2.0 mL min-1, one analysis cycle, including sampling and washing, could be accomplished in 60 s with a relative standard deviation of <5.0%. The method has been applied successfully to the determination of sudan I in Pixian douban, Golden Mark guilin chilli sauce, and Golden Mark satay sauce, and the recovery was 90.6−110.0%. Keywords: Sudan I; chemiluminescence; luminol; flow injection