Analyte focusing by micelle collapse is investigated as an on-line sample preconcentration technique in partial-filling MEKC with detection using UV and ESI-MS. Enhancement in peak height sensitivity of more than a 100 was obtained for model alkylphenylketones and dialkylphthalates using analyte focusing by micelle collapse-partial-filling MEKC with UV or ESI-MS detection.
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Quirino et al. (2009) studied this question.
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