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Chen T, Sun M, Li B, Wang Y, Zhang J, Xu C, Yu Y, Yuan L, Wu Y. Identifying hypothermia death in a mouse model by ATR-FTIR. Int J Legal Med 2024; 138:1179-1186. [PMID: 38191742 DOI: 10.1007/s00414-023-03156-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Accepted: 12/22/2023] [Indexed: 01/10/2024]
Abstract
The identification of hypothermia death (HD) is difficult for cadavers, especially the distinction from death due to alternative causes. A large number of studies have shown that brown adipose tissue (BAT) plays critical roles in thermoregulation of mammals. In this study, BAT of mice was used for the discrimination of HD using attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR). A modified mouse HD model conducted by Feeney DM was used in this study to obtain infrared spectra of BAT. Principal component analysis (PCA), partial least squares discriminant analysis (PLS-DA), and orthogonal partial least squares discriminant analysis (OPLS-DA) were used to establish discrimination models. The PLS-DA and OPLS-DA models exhibit prominent discriminative efficiency, and the accuracy of HD identification using fingerprint regions and ratios of absorption intensity is near 100% in both the calibration and validation sets. Our preliminary study suggests that BAT may be an extremely effective target tissue for identification of cadavers of HD, and ATR-FTIR spectra combined with chemometrics have also shown potential for cadaver identification in forensic practice in a fast and accurate manner.
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Affiliation(s)
- Tangdong Chen
- Department of Biochemistry and Molecular Biology, School of Basic Medicine, Shaanxi Provincial Key Laboratory of Clinic Genetics, The Air Force Medical University, Xi'an, 710032, China
| | - Mao Sun
- Department of Biochemistry and Molecular Biology, School of Basic Medicine, Shaanxi Provincial Key Laboratory of Clinic Genetics, The Air Force Medical University, Xi'an, 710032, China
| | - Bowen Li
- Department of Biochemistry and Molecular Biology, School of Basic Medicine, Shaanxi Provincial Key Laboratory of Clinic Genetics, The Air Force Medical University, Xi'an, 710032, China
| | - Yufeng Wang
- Department of Biochemistry and Molecular Biology, School of Basic Medicine, Shaanxi Provincial Key Laboratory of Clinic Genetics, The Air Force Medical University, Xi'an, 710032, China
| | - Juan Zhang
- Department of Biochemistry and Molecular Biology, School of Basic Medicine, Shaanxi Provincial Key Laboratory of Clinic Genetics, The Air Force Medical University, Xi'an, 710032, China
| | - Changwei Xu
- Department of Biochemistry and Molecular Biology, School of Basic Medicine, Shaanxi Provincial Key Laboratory of Clinic Genetics, The Air Force Medical University, Xi'an, 710032, China
| | - Yawen Yu
- Department of Biochemistry and Molecular Biology, School of Basic Medicine, Shaanxi Provincial Key Laboratory of Clinic Genetics, The Air Force Medical University, Xi'an, 710032, China
| | - Lijuan Yuan
- Department of Biochemistry and Molecular Biology, School of Basic Medicine, Shaanxi Provincial Key Laboratory of Clinic Genetics, The Air Force Medical University, Xi'an, 710032, China.
- Department of General Surgery, Tangdu Hospital, The Air Force Military Medical University, Xi'an, 710038, China.
| | - Yuanming Wu
- Department of Biochemistry and Molecular Biology, School of Basic Medicine, Shaanxi Provincial Key Laboratory of Clinic Genetics, The Air Force Medical University, Xi'an, 710032, China.
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