Tracing the Origin of the Anomalous Matrix Suppression in Matrix‐assisted Laser Desorption Ionization and Extending the Linear Dynamic Range During Analyte Quantification
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- Tracing the Origin of the Anomalous Matrix Suppression in Matrix‐assisted Laser Desorption Ionization and Extending the Linear Dynamic Range During Analyte Quantification
- Hyo In Song; Taeghwan Hyeon; Myung Soo Kim; Joo Yeon Oh; Jeong Hee Moon
- BULLETIN OF THE KOREAN CHEMICAL SOCIETY, v.39, no.2, pp.207 - 212
- WILEY-V C H VERLAG GMBH
- In the matrix-assisted laser desorption ionization-based quantification method developed in this laboratory,
a linear calibration curve is constructed by plotting the analyte-to-matrix ion abundance ratio as a function
of the analyte concentration. As the analyte concentration increases, however, the curve deviates from linearity.
Previously, we observed that the occurrence of this deviation correlated with the decrease in the
matrix ion signal, or matrix suppression. In this work, we found that saturation of the detector was one of
the factors responsible for the above phenomena. As we decreased the detector gain, the upper limit of the
linear dynamic range increased by as much as one order of magnitude. Even after a substantial decrease
in the detector gain, however, the nonlinearity remained at a high analyte concentration, which we cannot
account for at present. The method developed in this work can be useful for the quantitative imaging of
analytes in heavily contaminated samples.© 2018 Korean Chemical Society, Seoul & Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
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