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A preliminary study on postmortem interval estimation of suffocated rats by GC-MS/MS-based plasma metabolic profiling
Takako Sato1, Kei Zaitsu, Kento Tsuboi
1Department of Legal Medicine, Osaka Medical College, 2-7 Daigakumachi, Takatsuki, Osaka, 568-8686, Japan, leg017@art.osaka-med.ac.jp.
Analytical and Bioanalytical Chemistry
|March 10, 2015
Summary
Accurate postmortem interval (PMI) estimation is challenging. This study used plasma metabolic profiling in rats to develop a prediction model, showing metabolomics can aid forensic science in determining time since death.
Area of Science:
- Forensic Science
- Metabolomics
- Biochemistry
Background:
- Accurate postmortem interval (PMI) estimation is crucial in forensic autopsies.
- Conventional methods for PMI estimation are often affected by environmental factors like temperature and humidity.
- Developing reliable methods for PMI determination remains a significant challenge in forensic investigations.
Purpose of the Study:
- To investigate the potential of plasma metabolic profiling for estimating the postmortem interval (PMI).
- To develop and validate a predictive model for PMI using endogenous metabolites.
- To explore the utility of metabolomics in forensic casework.
Main Methods:
- Sprague-Dawley rats were used, with blood samples collected at various time points postmortem (0-48 hours).
- Gas chromatography-tandem mass spectrometry (GC-MS/MS) was employed to detect and quantify 70 endogenous plasma metabolites.
- Partial least squares (PLS) regression, combined with variable importance in projection (VIP) scores and Kruskal-Wallis tests, was used to build the PMI prediction model.
Main Results:
- Distinct separation of time groups was observed in principal component analysis (PCA) score plots, indicating time-dependent metabolic changes.
- A PLS regression model was successfully constructed using significantly altered metabolites.
- The developed PLS model demonstrated high accuracy in predicting the postmortem interval and was validated successfully.
Conclusions:
- Plasma metabolic profiling is a viable approach for estimating the postmortem interval under specific conditions.
- The study provides a foundation for the application of metabolomics in forensic science for PMI estimation.
- This research represents a significant step towards integrating metabolomic techniques into routine forensic casework.
