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Related Concept Videos

2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
COSY90 is the standard two-dimensional (2D) COSY experiment that...
High-Resolution Mass Spectrometry (HRMS)01:15

High-Resolution Mass Spectrometry (HRMS)

The resolution of a mass spectrometer depends on the efficiency of separating ions with different ion masses. The mass of an atom is approximated to the sum of the masses of protons and neutrons inside, considering the masses of protons and neutrons as equal. However, the masses of the proton (1.6726 × 10−24 g) and neutron (1.6749 × 10−24 g) are not truly equal. There is a minor error in the expression of atomic masses relative to the simplest atom of hydrogen. For example, the mass of helium...
2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other axis.
2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)

Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
NMR and Mass Spectroscopy of Carboxylic Acids01:30

NMR and Mass Spectroscopy of Carboxylic Acids

In ¹H NMR spectroscopy, acidic protons (–COOH) of carboxylic acids are highly deshielded and absorb far downfield, at around 9–12 ppm. The chemical shift value depends on the concentration and solvent used.
While α protons of carboxylic acids absorb at 2–2.5 ppm, β protons absorb further upfield.
Carboxylic acids are easily identified by dissolving them in deuterium oxide, which results in a rapid exchange of the acidic protons with deuterium. This leads to the disappearance of the acidic...
NMR Spectroscopy of Aromatic Compounds01:14

NMR Spectroscopy of Aromatic Compounds

Aromatic compounds can be identified or analyzed using proton NMR and carbon‐13 NMR. Typically, aromatic hydrogens or hydrogens directly bonded to the aromatic rings are strongly deshielded by the aromatic ring current. Therefore, they absorb in the range of 6.5–8.0 ppm in proton NMR spectra. For instance, aromatic hydrogens directly bonded to the benzene ring absorb at 7.3 ppm. However, aromatic hydrogens of larger rings absorb farther upfield or downfield than the ideal range. Consider...

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Species Determination and Quantitation in Mixtures Using MRM Mass Spectrometry of Peptides Applied to Meat Authentication
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Species Determination and Quantitation in Mixtures Using MRM Mass Spectrometry of Peptides Applied to Meat Authentication

Published on: September 20, 2016

HRMAS-NMR spectroscopy and multivariate analysis meat characterisation.

Mena Ritota1, Lorena Casciani, Sebastiana Failla

  • 1Agricultural Research Council-Research Centre for the Soil-Plant System, Instrumental Centre of Tor Mancina Strada della Neve Km 1, 00016 Monterotondo, Rome, Italy.

Meat Science
|July 24, 2012
PubMed
Summary

Nuclear magnetic resonance spectroscopy differentiated beef breeds by analyzing muscle metabolic profiles. This technique successfully classified Buffalo and Chianina, aiding in meat traceability and quality assessment.

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Area of Science:

  • Metabolomics
  • Animal Science
  • Spectroscopy

Background:

  • Understanding muscle composition differences across cattle breeds is crucial for meat science and traceability.
  • High-resolution magic angle spinning-nuclear magnetic resonance (HR-MAS-NMR) spectroscopy offers a non-destructive method for metabolic profiling.

Purpose of the Study:

  • To differentiate muscle metabolic profiles of four cattle breeds (Chianina, Holstein Friesian, Maremmana, Buffalo) using HR-MAS-NMR.
  • To develop predictive models for breed classification based on muscle metabolomics.

Main Methods:

  • HR-MAS-NMR spectroscopy was used to analyze longissimus dorsi and semitendinosus muscles.
  • Chemometric methods including Principal Component Analysis (PCA) and discriminant analyses (PLS-DA, OPLS-DA) were applied.
  • Intelligent bucketing was employed for Maremmana breed data to address resonance shifts.

Main Results:

  • Excellent classification accuracy was achieved for Buffalo and Chianina breeds.
  • Holstein Friesian breed showed lower separation, indicating more similar metabolic profiles.
  • Variable Importance in Projection (VIP) values identified key metabolites contributing to breed discrimination.

Conclusions:

  • HR-MAS-NMR combined with chemometrics is effective for differentiating cattle breeds based on muscle metabolic profiles.
  • The study highlights the potential for NMR-based meat authentication and quality assessment.
  • Metabolite profiles provide a biochemical basis for distinguishing between breeds like Chianina, Buffalo, and Holstein Friesian.