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- W2008051678 abstract "In this work, the implementation of isotope dilution mass spectrometry (IDMS) using minimal labeling and isotope pattern deconvolution (IPD) is evaluated as a strategy for the minimization of matrix effects during trace determination of β2-agonists in complex matrices by liquid chromatography electrospray ionization mass spectrometry (LC–ESI-MS). First, the parameters affecting the measurement of isotopic composition of organic compounds by liquid chromatography electrospray ionization high resolution mass spectrometry with a time-of-flight analyzer were evaluated using as a case of study three different β2-agonists: clenbuterol, clenproperol and brombuterol. Then, a calibration graph-free IDMS methodology was evaluated in order to overcome matrix effects in LC–ESI-MS in complex samples. In this procedure singly 13C-labeled analogues of clenbuterol, clenproperol and brombuterol were employed in combination with IPD. Using this approach accurate and precise results were obtained in the simultaneous quantification of β2-agonists in human urine and bovine liver, even at the sub ng g−1 and particularly in spite of the previously reported matrix effects. Recovery rates in the range of 97–114% in fortified human urine and from 95% to 111% in fortified bovine liver were obtained with RSD (%) of independent recovery experiments always lower than 6%. These results demonstrate that the proposed methodology based on the use of 13C1-labeled standards and IPD is a reliable approach for accurate LC–MS quantitation of small molecules and compatible with full-scan high-resolution mass spectrometry." @default.
- W2008051678 created "2016-06-24" @default.
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- W2008051678 date "2013-05-01" @default.
- W2008051678 modified "2023-10-18" @default.
- W2008051678 title "Overcoming matrix effects in electrospray: Quantitation of β-agonists in complex matrices by isotope dilution liquid chromatography–mass spectrometry using singly 13C-labeled analogues" @default.
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- W2008051678 doi "https://doi.org/10.1016/j.chroma.2013.02.074" @default.
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