ATR FT-IR Spectroscopy: Illuminating Blood Evidence and Advancing Forensic Science

Author：JIANGXI AIYI HI-TECH CO., LTD. Click： Time：2025-01-10 17:11:00

In recent years, FT-IR spectroscopy has become a popular technique in forensic analysis, especially as the demand for evidence and spectral data analysis in criminal investigations continues to increase. With the continuous development of portable instruments, FT-IR spectrometers have gradually been miniaturized while maintaining the necessary functions of larger devices. This technological advancement allows researchers to perform FT-IR spectroscopy directly at the crime scene, reducing the contamination and changes that may be caused by sample transportation.

A recent review article explores how an important application of FT-IR spectroscopy, attenuated total reflectance Fourier transform infrared spectroscopy (ATR FT-IR), can play a role in the analysis of blood evidence. This technology provides a precise and non-destructive examination method, injecting new impetus into forensic science. The on-site analysis capability of FT-IR spectroscopy is crucial to preserving the integrity of evidence, especially in time-sensitive criminal investigations.

Bloodstain analysis is one of the important application areas of FT-IR spectroscopy, which is often the key to solving crimes. ATR FT-IR spectroscopy can distinguish blood from other substances, analyze its biochemical composition, and estimate the deposition time of bloodstains. Based on the research results since 2008, this review discusses in detail the progress, challenges and future directions of FT-IR spectroscopy in blood analysis.

As a technology that uses the principle of infrared light absorption, FT-IR spectroscopy can identify key molecular components in blood, such as proteins, lipids and carbohydrates. This high sensitivity makes FT-IR spectroscopy a reliable tool for distinguishing blood from other biological or non-biological substances. In addition, FT-IR spectroscopy can also identify the species origin of blood, providing key evidence for cases involving multiple parties or non-human sources.

The combination of ATR FT-IR spectroscopy and chemometrics is another highlight in this review. Through the multivariate statistical methods of chemometrics, FT-IR spectroscopy analysis can achieve highly accurate qualitative and quantitative evaluation of blood evidence. This data-driven approach further enhances the value of FT-IR spectroscopy in forensic science.

Nevertheless, the application of FT-IR spectroscopy still faces some obstacles. The review points out that sample preparation problems, such as interference of substrate materials on spectral readings, and the lack of standardized protocols limit the widespread application of FT-IR spectroscopy in the field of forensics. These challenges need to be overcome by optimizing sample processing methods and establishing standardized databases.

In addition, the review also recommends combining ATR FT-IR spectroscopy with other vibrational spectroscopy techniques, such as Raman spectroscopy and near-infrared spectroscopy. The integration of FT-IR spectroscopy with these techniques can break through the current limitations and further expand its forensic capabilities.

Recent advances in FT-IR spectroscopy have made it a portable and cost-effective tool for non-destructive evidence analysis. In particular, ATR FT-IR spectroscopy has shown great potential in blood evidence analysis and will play an important role in forensic science and crime prevention.

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ATR FT-IR Spectroscopy: Illuminating Blood Evidence and Advancing Forensic Science

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