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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.
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Related Experiment Video

Updated: Jun 25, 2026

An Experimental and Finite Element Protocol to Investigate the Transport of Neutral and Charged Solutes across Articular Cartilage
07:57

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Published on: April 23, 2017

Multicomponent T2 relaxation analysis in cartilage.

David A Reiter1, Ping-Chang Lin, Kenneth W Fishbein

  • 1Magnetic Resonance Imaging and Spectroscopy Section, National Institute on Aging, National Institutes of Health, Baltimore, Maryland 21224, USA.

Magnetic Resonance in Medicine
|February 4, 2009
PubMed
Summary
This summary is machine-generated.

Multiexponential T(2) analysis of cartilage water compartments improves magnetic resonance (MR) specificity for early osteoarthritis detection. This method differentiates between normal and degraded cartilage by analyzing water bound to collagen and proteoglycans (PG).

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Last Updated: Jun 25, 2026

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Area of Science:

  • Biomolecular Science
  • Medical Imaging
  • Osteoarthritis Research

Background:

  • Magnetic resonance (MR) imaging is sensitive to early osteoarthritis changes like collagen disruption and proteoglycan (PG) loss.
  • Current MR techniques lack specificity in characterizing these early degenerative changes in cartilage.

Purpose of the Study:

  • To enhance the specificity of MR for early osteoarthritis detection.
  • To characterize water compartments in normal and degraded cartilage using multiexponential T(2) relaxation analysis.

Main Methods:

  • Nonnegative least squares multiexponential analysis of T(2) relaxation was applied to bovine nasal cartilage.
  • Water compartments were identified and their relaxation times (T(2)) and fractions (w) were determined.
  • Data were simulated to optimize acquisition parameters and assess experimental accuracy and precision.

Main Results:

  • Three water components were identified with distinct T(2) values and fractions.
  • Trypsinization, mimicking cartilage degradation, significantly increased T(2) values for components associated with PG-bound water.
  • The T(2) of collagen-bound water remained unaltered, confirming its assignment.

Conclusions:

  • Multiexponential T(2) analysis effectively distinguishes between normal and degraded cartilage.
  • This MR technique shows potential for increased specificity in characterizing cartilage in early osteoarthritis.
  • The findings support the assignment of T(2) components to specific water environments within cartilage.