L. WANG ET AL.
Copyright © 2013 SciRes. ENG
Table 3. Precision and recovery of LC- MS/MS analysis (n =
5).
Dye
amount
spiked Intra-day Inter-day
(mg/kg) Recovery Precision Recovery Precision
Sudan I 0.25 87.7% 4.75% 90.7% 5.27%
0.50 90.0% 3.97% 93.2% 3.16%
1.00 94.0% 7.05% 90.4% 5.80%
Sudan II 0.25 86.1% 4.59% 91.9% 3.43%
0.50 88.5% 2.49% 91.7% 2.24%
1.00 91.1% 5.27% 89.7% 4.64%
Sudan III 0.25 80.7% 7.60% 86.3% 5.50%
0.50 82.5% 2.91% 89.3% 3.12%
1.00 89.2% 5.80% 88.9% 5.06%
Sudan IV 0.25 81.1% 6.27% 85.6% 7.58%
0.50 101.6% 3.97% 104.4% 4.76%
1.00 103.1% 4.49% 100.1% 12.20%
Sudan Red G 0.25 90.8% 7.31% 93.4% 5.06%
0.50 90.5% 3.83% 93.5% 2.88%
1.00 96.2% 5.42% 93.3% 4.14%
Sudan Red 7B 0.25 92.4% 10.16% 99.7% 6.24%
0.50 101.8% 3.21% 100.5% 3.15%
1.00 91.7% 5.97% 95.9% 7.68%
Sudan Black B
0.25 88.3% 4.10% 89.2% 4.40%
0.50 89.6% 4.23% 89.1% 3.25%
1.00 93.7% 7.20% 91.4% 4.07%
Sudan Yellow 0.25 98.8% 5.77% 94.2% 4.34%
0.50 98.7% 3.37% 94.8% 2.42%
1.00 100.7% 5.88% 93.0% 3.60%
4. Conclusion
A sensitive UPLC-ESI-MS/MS assay was developed to
determine eight Sudan dyes in chili powder. The method
had simple pretreatment, and offered high selectivity.
Sensitivity, precision and rec ov ery of variation were ac-
ceptable. The method could be used for routine analysis.
5. Acknowledgements
This work was supported by the Plan of Science and
Technology of Beijing (Z111100074211021).
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