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Infrared (IR) Spectroscopy: Overview01:09

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When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
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IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
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Mass spectrometry is a powerful characterization technique that can identify and separate a wide variety of compounds ranging from chemical to biological entities, based on their mass-to-charge ratio (m/z). The instruments that allow this detection, known as mass spectrometers, have three components: an ion source, a mass analyzer, and a detector. These spectrometers differ based on the nature of their ion source and analyzers.Matrix-assisted laser desorption ionization (MALDI) is a commonly...
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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,...
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When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
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Detergent Analysis in Protein Samples Using Mid-Infrared (MIR) Spectroscopy.

Chandreyee Das1, Timothy Nadler1, Ivona Strug1

  • 1EMD Millipore Corporation, Danvers, Massachusetts.

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|August 4, 2015
PubMed
Summary

Accurate detergent quantification in protein samples is crucial for reliable analysis. Mid-infrared spectroscopy offers a rapid, sample-sparing method for analyzing detergent and protein levels, improving sample preparation efficiency.

Keywords:
detergent analysisdetergent removalinfraredmid-infrared (MIR) spectroscopyprotein samples

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Area of Science:

  • Biochemistry
  • Analytical Chemistry
  • Spectroscopy

Background:

  • Detergent presence in biological samples can interfere with downstream analyses and protein integrity.
  • Limited sample volumes and resources necessitate rapid, simple, and sample-efficient quantification methods.
  • A universal method applicable to various detergents is desirable for broad utility.

Purpose of the Study:

  • To present mid-infrared (MIR) spectroscopy methods for quantifying detergents and proteins in biological samples.
  • To provide a protocol for detergent removal and simultaneous MIR-based monitoring.
  • To enable timely decisions in sample preparation for optimal purity and yield.

Main Methods:

  • Utilizing mid-infrared (MIR) spectroscopy for analyzing detergent and protein concentrations.
  • Implementing a protocol for efficient unbound detergent removal from protein samples.
  • Monitoring detergent and protein content during sample preparation using MIR.

Main Results:

  • Demonstrated MIR spectroscopy as an effective tool for detergent and protein quantification.
  • Developed a protocol that allows for simultaneous monitoring of both components.
  • Showcased the ability of the method to guide sample preparation decisions.

Conclusions:

  • MIR spectroscopy provides a rapid and sample-efficient approach for analyzing detergent-protein mixtures.
  • The described protocol enhances sample preparation by enabling real-time monitoring and optimization.
  • This technique is valuable for ensuring analyte purity and maximizing yield in biological sample analysis.