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Atmospheric pressure photoionization–tandem mass spectrometry (APPI–MS/MS) method has been developed for quantitative determination of Sudan I to IV dyes. This study demonstrates the applicability of a simple isocratic normal phase HPLC method using isopropanol (0.3%) in n-hexane as the mobile phase for the separation of these dyes. A simple extraction procedure using n-hexane has been applied for...
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