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- [4] Fast cleanup method for the analysis of sudan I-IV and para red in various foods and paprika color (oleoresin) by high-performance liquid chromatography/diode array detection: Focus on removal of fat and oil as fatty acid methyl esters prepared by transesterification of acylglycerols [J]. JOURNAL OF AOAC INTERNATIONAL, 2007, 90 (02) : 437 - 445