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01-03-2020 | Brainstem Contusion | Original Article

Evaluating the effects of causes of death on postmortem interval estimation by ATR-FTIR spectroscopy

Authors: Kai Zhang, Qi Wang, Ruina Liu, Xin Wei, Zhouru Li, Shuanliang Fan, Zhenyuan Wang

Published in: International Journal of Legal Medicine | Issue 2/2020

Abstract

Estimating postmortem interval (PMI) is one of the most challenging tasks in forensic practice due to the effects of many factors. Here, attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy combined with chemometrics was utilized to evaluate the effects of causes of death when estimating PMI and to establish a partial least square (PLS) regression model, which can precisely predict PMI under different causes of death. First, the sensitivities to causes of death (brainstem injury, mechanical asphyxia, and hemorrhage shock) of seven kinds of organs were evaluated based on their degrees of cohesion and separation. Then, the liver was selected as the most sensitive organ to establish a PMI estimation model to compare the predicted deviations from different causes of death. It turns out that the cause of death has no significant effect on estimating PMI. Next, a PLS regression model was built with kidney tissues, which have the lowest sensitivity, and this model showed a satisfactory predictive ability and wide applicability. This study demonstrates the feasibility of using ATR-FTIR spectroscopy in conjunction with chemometrics as a powerful alternative for detecting changes in biochemistry and estimating PMI. A new perspective was also provided for evaluating the effect of causes of death when predicting PMI.

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Title: Evaluating the effects of causes of death on postmortem interval estimation by ATR-FTIR spectroscopy
Authors: Kai Zhang
Qi Wang
Ruina Liu
Xin Wei
Zhouru Li
Shuanliang Fan
Zhenyuan Wang
Publication date: 01-03-2020
Publisher: Springer Berlin Heidelberg
Keyword: Brainstem Contusion
Published in: International Journal of Legal Medicine / Issue 2/2020
Print ISSN: 0937-9827
Electronic ISSN: 1437-1596
DOI: https://doi.org/10.1007/s00414-019-02042-z

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Evaluating the effects of causes of death on postmortem interval estimation by ATR-FTIR spectroscopy

Abstract

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Abstract

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