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The application of matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS) is presented for the determination of five sulfonated azo dyes in chili powders. To circumvent problems related to spectral noise and overall poor precision, acid red 88 was used as internal standard and sample cleanup was performed via ion pairing of anionic species with benzyltributylammonium...
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