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Related Concept Videos

IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

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When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
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Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
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IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

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A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to...
1.2K
Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
335
Applications of IR Spectroscopy: Overview01:11

Applications of IR Spectroscopy: Overview

515
The non-destructive nature and ability to provide valuable chemical information make IR spectroscopy a versatile technique with broad applications in various scientific and industrial fields. IR spectroscopy is commonly used to identify and characterize organic and inorganic compounds. It provides information about the functional groups present in a molecule and the bonding between atoms. This helps in the structural elucidation of compounds during organic synthesis, pharmaceutical research,...
515
Mass Spectrometry: Complex Analysis01:21

Mass Spectrometry: Complex Analysis

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Mass spectrometry is an important technique for the identification of pure compounds. However, it has some limitations for the analysis of complex mixtures, often due to excessive fragmentation making the spectrum too complicated to decipher. Mass spectrometry can be combined with suitable separation methods in sequence, forming hyphenated methods, which are useful in the analysis of complex mixtures.
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
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Gas Chromatography-Mass Spectrometry Paired with Total Vaporization Solid-Phase Microextraction as a Forensic Tool
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[Vibrational spectroscopy use for forensic purposes combined with machine learning].

R Alpuche1, Yu I Pigolkin2, S N Zakharov2

  • 1University at Albani - State University of New York, New York, USA.

Sudebno-Meditsinskaia Ekspertiza
|August 27, 2024
PubMed
Summary

Vibrational spectroscopy and machine learning offer powerful forensic tools. This research focuses on a universal method for identifying bodily secretions, determining trace age, and revealing host phenotypes like sex, race, and age.

Keywords:
Raman spectroscopyfluids of the bodyforensicmachine learningresidues of firearm

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Area of Science:

  • Forensic Science
  • Analytical Chemistry
  • Biotechnology

Background:

  • Vibrational spectroscopy, including Raman spectroscopy, is increasingly utilized in forensic science for drug identification.
  • Emerging spectroscopic technologies are expanding applications to analyze diverse forensic evidence like documents, textiles, and biological traces.
  • Current forensic methods for serological studies often lack universality and comprehensive profiling capabilities.

Purpose of the Study:

  • To develop a universal method for identifying major human bodily secretions using vibrational spectroscopy.
  • To establish a technique for determining the time elapsed since a biological trace was deposited.
  • To enable the determination of host phenotypic information (sex, race, age) from biological traces.

Main Methods:

  • Utilizing advanced vibrational spectroscopy techniques for chemical analysis of biological samples.
  • Applying machine learning algorithms for pattern recognition and data interpretation.
  • Developing specific spectral signatures for various bodily secretions and associated biomarkers.

Main Results:

  • Demonstrated the potential of vibrational spectroscopy for the universal identification of key bodily secretions.
  • Successfully correlated spectral data with the time elapsed since trace deposition.
  • Achieved accurate determination of host sex, race, and age from analyzed biological traces.

Conclusions:

  • Vibrational spectroscopy, enhanced by machine learning, presents a significant advancement for forensic serology.
  • The developed universal method offers a powerful tool for forensic investigations, providing detailed information from biological evidence.
  • This technology has the potential to revolutionize the analysis of various forensic trace materials beyond bodily secretions.