Estimation of the age of human bloodstains by electron paramagnetic resonance spectroscopy: long-term controlled experiment on the effects of environmental factors.

@article{Fujita2005EstimationOT,
  title={Estimation of the age of human bloodstains by electron paramagnetic resonance spectroscopy: long-term controlled experiment on the effects of environmental factors.},
  author={Yoshihiko Fujita and Koichiro Tsuchiya and S. Abe and Yoshiharu Takiguchi and Shin-Ichi Kubo and Hiromu Sakurai},
  journal={Forensic science international},
  year={2005},
  volume={152 1},
  pages={
          39-43
        }
}
In this study, we examined the efficacy and limitations of electron paramagnetic resonance (EPR) for estimating the age of human bloodstains. At 77K, human bloodstains give four striking EPR signals in the g=6.2 (g6), 4.3 (g4), 2.27 (H) and 2.005 (R) regions due to ferric high-spin, ferric non-heme, ferric low-spin and free radical species, respectively. We found that plotting double logarithms of the EPR intensity ratio of H/g4 versus days past bleeding gave a linear correlation up to 432 days… CONTINUE READING
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