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Author Spotlight: Quantification of Complex Lipidomic Samples Using Stable Isotope Labeling
Published on: August 23, 2024
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Development, Validation, and Application of a New Method To Correct the Nonlinearity Problem in LC-MS/MS
Qian Liu1,2, Fulin Jiang1, Janshon Zhu3
1School of Pharmaceutical Sciences , Sun Yat-sen University , Guangzhou 510006 , Guangdong Province , China.
Analytical Chemistry
|July 4, 2019
Summary
Stable isotope-labeled internal standards (SIL-IS) can cause issues in nonlinear liquid chromatography-tandem mass spectrometry (LC-MS/MS) bioanalysis. A new component equation (CE) calibration method effectively corrects for this cross-talk, ensuring accurate quantification.
Area of Science:
- Analytical Chemistry
- Biochemistry
- Pharmacology
Background:
- Liquid chromatography coupled with tandem mass spectrometry (LC-MS/MS) is vital for bioanalysis.
- Stable isotope-labeled internal standards (SIL-IS) are commonly used for quantification.
- Nonlinear system responses in LC-MS/MS can lead to inaccuracies due to cross-signal contributions between analytes and SIL-IS.
Purpose of the Study:
- To illustrate the problems caused by cross-talk between analytes and SIL-IS in nonlinear LC-MS/MS systems.
- To propose and validate a new calibration method, the component equation (CE), for nonlinearity correction.
Main Methods:
- Investigated the impact of SIL-IS addition on analyte signal response in nonlinear LC-MS/MS.
- Developed and applied the component equation (CE) for calibration curve correction.
- Compared the accuracy of CE calibration against the standard SIL-IS method using drugs with linear and nonlinear responses.
Main Results:
- Cross-talk between analyte and SIL-IS significantly affects quantification in nonlinear LC-MS/MS.
- The proposed CE calibration method demonstrated acceptable accuracy.
- CE calibration was comparable to standard SIL-IS methods with proper weighting and superior without weighting.
Conclusions:
- Nonlinearity in LC-MS/MS systems requires careful consideration when using SIL-IS.
- The component equation (CE) offers a reliable alternative for correcting nonlinearity in LC-MS/MS quantification.
- CE calibration provides a robust approach to enhance the accuracy of bioanalytical measurements.
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