Optimization of Sample Preparation processes of Bone Material for Raman Spectroscopy

Area of Science:

• Forensic Science
• Biophysics
• Analytical Chemistry

Background:

• Raman spectroscopy shows promise for determining postmortem interval from skeletal remains.
• Sample fluorescence is a significant limitation in Raman spectroscopic analysis of bone.
• Effective sample preparation is crucial for accurate forensic analysis.

Purpose of the Study:

• To compare the efficacy of chemical bleaching and scraping for reducing bone sample fluorescence.
• To evaluate the impact of these preparation methods on Raman spectral data.
• To determine the optimal sample preparation technique for forensic applications.

Main Methods:

• Bone samples were prepared using chemical bleaching and scraping techniques.
• Raman spectra were acquired at 1064 nm excitation post-preparation.
• Fluorescence levels were visually assessed from the obtained spectra.

Main Results:

• Both chemical bleaching and scraping reduced fluorescence in bone samples.
• Scraping demonstrated greater effectiveness in fluorescence reduction compared to chemical bleaching.
• Scraping is a less destructive method, preserving the original state of skeletal material.

Conclusions:

• Bone scraping is recommended over chemical bleaching for sample preparation in Raman spectroscopy for forensic analysis.
• This method enhances the reliability of postmortem interval calculations from skeletal remains.
• Preserving sample integrity is critical for accurate forensic investigations.