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Related Experiment Video

Updated: May 27, 2026

Sarcomere Shortening of Pluripotent Stem Cell-Derived Cardiomyocytes using Fluorescent-Tagged Sarcomere Proteins.

Sarcomere Shortening of Pluripotent Stem Cell-Derived Cardiomyocytes using Fluorescent-Tagged Sarcomere Proteins.

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Sarcomere length determination using front-face fluorescence polarization.

C Luc¹, S Clerjon, F Peyrin

¹Centre INRA de Theix, UR370 QuaPA, F-63122 Saint-Genes-Champanelle, France.

|November 9, 2011

Summary

This summary is machine-generated.

This study introduces a fluorescence anisotropy method to measure beef sarcomere length, aiding in detecting cold shortening and preventing meat toughness.

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Last Updated: May 27, 2026

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Examining the Conformational Dynamics of Membrane Proteins in situ with Site-directed Fluorescence Labeling

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Published on: May 29, 2011

Area of Science:

Muscle physiology
Biophysics
Food science

Background:

Tryptophan is a key intrinsic fluorophore in muscle proteins.
Proteins exhibit preferential alignments relative to muscle fiber direction.
Muscle structure impacts meat quality characteristics like toughness.

Purpose of the Study:

To estimate post-rigor sarcomere length in beef using tryptophan fluorescence.
To develop an in-line detection method for cold shortening in meat.
To correlate fluorescence anisotropy with meat structure and quality.

Main Methods:

Utilized a theoretical model and front-face fluorescence polarization.
Measured tryptophan fluorescence anisotropy.
Assessed sarcomere length in beef samples (1.6–3.4 μm).

Main Results:

Fluorescence anisotropy varied between normal, stretched, and cold-shortened beef samples.
Cold shortening led to fiber misalignment, reducing anisotropy.
The method successfully estimated sarcomere length.

Conclusions:

Fluorescence anisotropy is a viable indicator of sarcomere length and cold shortening in beef.
This technique can be applied for in-line quality control in the meat industry.
Detecting cold shortening early can mitigate meat toughness.