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Related Concept Videos

Protein Dynamics in Living Cells01:19

Protein Dynamics in Living Cells

Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...

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Determination of Lipid Raft Partitioning of Fluorescently-tagged Probes in Living Cells by Fluorescence Correlation Spectroscopy FCS
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Two-Dimensional Correlation Spectroscopy Analysis of Bloodstain Aging Using Fluorescence Spectral Data.

Sila Jin1,2, Alexis Weber1, Young Mee Jung2,3

  • 1Department of Chemistry, University at Albany, SUNY, 1400 Washington Avenue, Albany, New York 12222, USA.

Applied Spectroscopy
|October 22, 2025
PubMed
Summary

Forensic science can improve bloodstain dating using advanced fluorescence spectroscopy. This study reveals molecular changes in aging bloodstains, enhancing time since deposition (TSD) estimations.

Keywords:
2D gradient map2D hetero-spectral correlation analysis2D-COSFluorescence spectroscopybloodstain agingkinetic analysistwo-dimensional correlation spectroscopy

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Area of Science:

  • Biochemistry
  • Forensic Science
  • Spectroscopy

Background:

  • Accurate estimation of time since deposition (TSD) for bloodstains is crucial in forensic investigations.
  • Fluorescence spectroscopy effectively tracks endogenous fluorophores (tryptophan, NADH, flavins) but faces challenges like spectral overlap and sample variability.
  • Understanding bloodstain biochemical aging is key to developing reliable forensic methods.

Purpose of the Study:

  • To investigate time-dependent fluorescence changes in bloodstains using advanced spectroscopic techniques.
  • To gain molecular-level insights into the biochemical mechanisms of bloodstain aging.
  • To establish a foundation for more accurate and robust forensic TSD estimation.

Main Methods:

  • Utilized two-dimensional correlation spectroscopy (2D-COS) to analyze fluorescence spectral data.
  • Employed 2D gradient mapping to visualize and quantify time-dependent spectral trends.
  • Monitored bloodstain aging over a 24-hour period.

Main Results:

  • 2D-COS identified hidden spectral components and sequential molecular changes, particularly in NADH and flavin bands.
  • 2D gradient maps provided quantitative visualization of spectral changes during bloodstain aging.
  • Demonstrated sequential biochemical alterations in bloodstains over 24 hours.

Conclusions:

  • Advanced fluorescence techniques like 2D-COS offer deeper insights into bloodstain aging mechanisms.
  • The study provides a fundamental understanding of ex vivo blood degradation.
  • Findings support the development of improved forensic tools for TSD estimation.