TY  - JOUR
PY  - 2021//
TI  - Drowning and postmortem immersion identification using attenuated total reflection-Fourier transform infrared spectroscopy
JO  - Microchemical journal
A1  - Xiong, Hongli
A1  - Wang, Qi
A1  - Zhao, Minzhu
A1  - Zheng, Zhe
A1  - Zhu, Shisheng
A1  - Zhu, Ying
A1  - Li, Yongguo
A1  - Li, Siqiao
A1  - Ding, Shijia
A1  - Li, Hongwei
A1  - Li, Jianbo
SP  - e106310
EP  - e106310
VL  - 167
IS  - 
N2  - It remains a major challenge for forensic practice to accurately distinguish whether a corpse in the water died from drowning or postmortem immersion. When the corpse is severely decomposed, the problem becomes more complicated. In this study, we utilized attenuated total reflection-Fourier Transform Infrared Spectroscopy (ATR-FTIR) and chemometrics to distinguish whether a corpse in the water died from drowning or postmortem immersion. The results of Principal Component Analysis (PCA) showed that there was a certain degree of difference between the freshwater group and the saltwater group due to the different concentrations of drowning medium, and the degradation of lung tissue had no significant effect on the differentiation between drowning and postmortem immersion. Amide I and amide II contribute to the distinction between drowning and postmortem immersion. Subsequently, we constructed partial least squares discriminant analysis (PLS-DA) models for the identification of drowning and posthumous immersion in the freshwater group and the saltwater group, respectively. Both models showed good classification capacity, with the accuracy rates of 94.4% and 100%, respectively. As to results of average second derivative spectroscopy, PCA and PLS-DA all indicate that the difference in protein structure and content is the key to distinguish between drowning and postmortem immersion. This pilot study demonstrates that ATR-FTIR in combination with chemometrics has the potential to be an effective method for distinguishing between drowning and postmortem immersion.<p />  <p>Language: en</p>
LA  - en
SN  - 0026-265X
UR  - http://dx.doi.org/10.1016/j.microc.2021.106310
ID  - ref1
ER  -