A Raman “spectroscopic clock” for bloodstain age determination: the first week after deposition

Abstract

Knowing the time since deposition (TSD) of an evidentiary bloodstain is highly desired in forensics, yet it can be extremely complicated to accurately determine in practice. Although there have been numerous attempts to solve this problem using a variety of different techniques, currently, no established, well-accepted method exists. Here, a Raman spectroscopic approach was developed for determining the age of bloodstains up to 1 week old. Raman spectroscopy, along with two-dimensional correlation spectroscopy (2D CoS) and statistical modeling, was used to analyze fresh bloodstains at ten time points under ambient conditions. The 2D CoS results indicate a high correlation between several Raman bands and the age of a bloodstain. A regression model was built to provide quantitative predictions of the TSD, with cross-validated root mean squared error and R 2 values of 0.13 and 0.97, respectively. It was determined that a “new” (1 h) bloodstain could be easily distinguished from older bloodstains, which is very important for forensic science in helping to establish the relevant association of multiple bloodstains. Additionally, all bloodstains were confirmatively identified as blood by comparing the experimentally measured spectra to multidimensional body fluid spectroscopic signatures of blood, saliva, semen, sweat, and vaginal fluid. These results demonstrate that Raman spectroscopy can be used as a nondestructive analytical tool for discriminating between bloodstains on the scale of hours to days. This approach shows promise for immediate practical use in the field to predict the TSD with a high degree of accuracy.

Bloodstain aging over time illustrating naturally ocurring processes

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Acknowledgments

This project was supported by Awards No. 2011-DN-BX-K551, 2014-DN-BX-K016, and 2015-R2-CX-0021 awarded by the National Institute of Justice, Office of Justice Programs, U.S. Department of Justice (I.K.L.). The opinions, findings, and conclusions or recommendations expressed in this publication are those of the authors and do not necessarily reflect those of the U.S. Department of Justice.

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Correspondence to Igor K. Lednev.

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Conflict of interest

The authors declare that they have no conflicts of interest.

Research involving human participants

Blood collection for this project was approved by the Institutional Review Board at the University at Albany. All blood donors used for this study supplied written consent, prior to blood donation, for the use of their blood for research purposes. This consent included the donors’ acknowledgement that they were healthy, over the age of 18, and not using any prescription or recreational drugs and that they could withdraw from the study at any time without any repercussions.

Funding

This project was supported by Awards No. 2011-DN-BX-K551, 2014-DN-BX-K016, and 2015-R2-CX-0021 awarded by the National Institute of Justice, Office of Justice Programs, U.S. Department of Justice (I.K.L.). The opinions, findings, and conclusions or recommendations expressed in this publication are those of the authors and do not necessarily reflect those of the U.S. Department of Justice.

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Doty, K.C., McLaughlin, G. & Lednev, I.K. A Raman “spectroscopic clock” for bloodstain age determination: the first week after deposition. Anal Bioanal Chem 408, 3993–4001 (2016). https://doi.org/10.1007/s00216-016-9486-z

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Keywords

  • Forensic
  • Blood
  • Chemometrics
  • Aging
  • Two-dimensional correlation spectroscopy
  • Time since deposition