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Related Concept Videos

Sample Preparation for Analysis: Advanced Techniques01:08

Sample Preparation for Analysis: Advanced Techniques

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Accurate analysis of complex samples often requires advanced preparation techniques to achieve reliable and reproducible results. Samples containing inorganic or organic materials can be challenging to dissolve or decompose effectively. Standard sample preparation methods include acid digestion, fusion, dry ashing, and wet digestion.
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To be visualized by an electron microscope, either transmission or scanning, biological samples need to be fixed (stabilized) so the electron beam does not destroy them and dried thoroughly (desiccated/dehydrated) so the vacuum does not affect them. Fixation needs to be done as quickly as possible because the sample properties will start changing as soon as it is removed from its natural environment. For example, in a tissue sample, the oxygen levels begin decreasing, causing an altered...
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Sample preparation is an essential step in the analytical process. It involves preparing a sample so that it can be analyzed accurately. The goal is to extract the analyte, the substance you want to measure, from the sample while removing any components that may interfere with the analysis. Sample preparation techniques vary depending on the physical state of the sample.
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An analytical methodology can be divided into four sequential steps: technique, method, procedure, and protocol. A technique is a scientific principle that rationalizes a specific phenomenon through chemical measurements. Adapting a technique for analyzing a sample of interest is termed a method. The procedure outlines the directions for performing the analysis via an analytical method. The protocol is the detailed guidelines on the procedure, which should be strictly followed to obtain the...
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In certain chromatographic separations, solutes transfer between the mobile phase and the stationary phase via sorption, which typically refers to the process of adsorption. For many chromatographic systems, the sorption process often depends on the polarity of the compounds—an expression of the overall dipole moment within the molecule. During the separation process, there is competition between the solute and solvent for adsorption to the stationary phase. Highly polar compounds and...
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Carl Jung, a Swiss psychiatrist and former follower of Freud, eventually broke away from Freud's ideas to create his framework, analytical psychology. This approach emphasizes achieving a balance between the conscious and unconscious aspects of the mind and reconciling various experiences within an individual's personality. Jung believed that this process, which typically unfolds in the latter part of life, involves an ongoing journey of recognizing and incorporating unconscious...
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Gas Chromatography-Mass Spectrometry Paired with Total Vaporization Solid-Phase Microextraction as a Forensic Tool
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Microextraction sample preparation techniques in forensic analytical toxicology.

Yi He1, Marta Concheiro-Guisan1

  • 1Department of Sciences, John Jay College of Criminal Justice, The City University of New York, New York, NY, USA.

Biomedical Chromatography : BMC
|November 24, 2018
PubMed
Summary
This summary is machine-generated.

Forensic toxicology relies on sample preparation for accurate analysis. Microextraction techniques offer faster, greener methods for extracting analytes from biological samples like blood and hair.

Keywords:
biological matricesforensic toxicologymicroextractionsample preparation

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Area of Science:

  • Forensic Analytical Toxicology
  • Analytical Chemistry
  • Sample Preparation Techniques

Background:

  • Sample preparation is crucial in forensic toxicology for removing interferences and concentrating analytes.
  • Traditional extraction methods face challenges with speed, efficiency, and environmental impact.
  • Microextraction techniques have emerged as promising alternatives.

Purpose of the Study:

  • To review various microextraction methods used in forensic toxicology.
  • To discuss the applications of these techniques in analyzing biological samples.
  • To explore future trends in microextraction for forensic analysis.

Main Methods:

  • Solid-based microextraction techniques: solid-phase microextraction (SPME), microextraction by packed sorbent (MEPS), stir-bar sorptive extraction (SBSE).
  • Liquid-based microextraction techniques: single drop/hollow fiber-based liquid-phase microextraction (LPME), dispersive liquid-liquid microextraction (DLLME).

Main Results:

  • Microextraction techniques effectively remove interferences and reduce matrix effects in biological samples.
  • These methods offer advantages in speed, reduced solvent consumption, and environmental friendliness.
  • Various microextraction techniques demonstrate broad applicability in forensic toxicology.

Conclusions:

  • Microextraction techniques are advancing forensic analytical toxicology by providing efficient and sustainable sample preparation solutions.
  • Continued development in microextraction promises further improvements in speed and ecological impact.
  • These methods are vital for the accurate and reliable analysis of target analytes in forensic investigations.