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Modelling post-mortem tenderisation-III: Role of calpain I in conditioning.

¹Department of Veterinary Medicine, University of Bristol, Churchill Building, Langford, Bristol BS18 7DY, UK.

|November 9, 2011

Summary

A simple model explains beef tenderness variations using calpain I (a protease). This enzyme activates as muscle pH drops, tenderizing meat through proteolysis until depleted, with temperature influencing the rate.

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Area of Science:

Meat Science
Biochemistry
Food Technology

Background:

Beef tenderness is a critical quality attribute influenced by post-mortem muscle changes.
Electrical stimulation and storage temperature significantly affect meat tenderization processes.

Purpose of the Study:

To develop a model explaining beef tenderness variation based on calpain I activity.
To investigate the role of calpain I proteolysis in beef tenderization under different storage conditions.

Main Methods:

A simple mathematical model was developed to simulate calpain I activity.
Muscle pH changes and temperature effects on calpain I kinetics were analyzed.
Model parameters were derived from experimental data.

Main Results:

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Calpain I activation at pH ~6.1 initiates proteolysis and tenderization.
Tenderization rate is proportional to calpain I concentration, which decreases via autolysis.
Higher temperatures reduce overall tenderization due to calpain I inactivation kinetics.
The model predicted 68% of the variation in beef toughness.

Conclusions:

Calpain I-mediated proteolysis is a key mechanism driving beef tenderization.
Temperature significantly impacts the rate and extent of calpain I-driven tenderization.
The developed model accurately predicts tenderness variations in beef.