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Volume 21, Issue 2, Pages 135-141

Rapid assay of picogram level of sudan I in hot chilli sauce by flow injection chemiluminescence

Xiaofei Gao, Houyong Liu, Zhenghua Song, Xili He, and Faxin Dong

Department of Chemistry, Northwest University, 710069, Xi'an, China

Copyright © 2007 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A novel chemiluminescence method for the assay of sudan I was designed using flow injection with chemiluminescence detection. The proposed method was based on the increment effect of sudan I on the chemiluminescence intensity in the luminol–KIO4 system. The increment of chemiluminescence intensity was correlated with the sudan I concentration in the range from 0.1 to 10 pg ml−1, and the determination could be performed in 0.5 min in flow rate of 2 ml min−1, including sampling and washing, giving a throughput of 120 h−1 with a relative standard deviation of less than 5.0%. The method had been successfully applied to the assay of sudan I in Pixian douban, Golden mark guilin chilli sauce and Golden mark satay sauce, and the recovery was 90.0–103.8%.