Changes in Attenuated Total Reflection Fourier Transform Infrared Spectra as Blood Dries Out |
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| Authors: | Yinming Zhang MM Qi Wang MB Bing Li MB Zhijun Wang MB Chengzhi Li MM Yao Yao MM Ping Huang PhD Zhenyuan Wang MD PhD |
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| Affiliation: | 1. Department of Forensic Medicine, School of Medicine, Xi'an Jiaotong University, Xi'an, PR, China;2. Department of Forensic Pathology, Institute of Forensic Science, Ministry of Justice, Shanghai, PR, China |
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| Abstract: | The time since deposition (TSD) of a bloodstain is a valuable piece of evidence for forensic scientists to determine the time at which a crime took place. The objective of this study was to determine whether attenuated total reflection (ATR) Fourier transform infrared (FTIR) spectroscopy could be used to estimate the TSD of a bloodstain in a relatively early period (from 0 min to the time required for the bloodstain to dry out). For this purpose, we used ATR‐FTIR to study the variation in absorbance at certain wavelengths as rat and human blood sample dried out. The absorbance at 3308/cm (A3308) was found to have a close correlation with the TSD during this time period, and the changes in A3308 during the drying of rat and human blood drops under the same controlled conditions showed similar results. The current study indicates that ATR‐FTIR spectroscopy has potential as a tool for estimating TSD at early time periods of blood deposition. |
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| Keywords: | forensic science forensic pathology time since deposition bloodstain Fourier transform infrared spectroscopy Logistic regression analysis |
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