Electrical impedance and tenderisation in bovine meat

Area of Science:

• Food Science
• Meat Science
• Electrical Engineering

Background:

• Meat quality is influenced by post-mortem aging.
• Electrical properties of meat change during aging.
• Muscle fiber mechanical resistance is a key indicator of meat texture.

Purpose of the Study:

• To investigate the relationship between electrical properties and mechanical resistance during beef aging.
• To evaluate the potential of electrical measurements for predicting meat aging.
• To assess the utility of electrical anisotropy as a meat aging indicator.

Main Methods:

• Measured electrical properties (impedance, anisotropy) and muscle fiber mechanical resistance in beef muscles (Semimembranosus, Pectoralis Profundus) from 1 to 14 days post-mortem.
• Utilized contact and penetrating electrode types for electrical measurements.
• Analyzed correlations between electrical parameters and mechanical resistance.

Main Results:

• Electrical measurements using different electrode types were highly correlated.
• Impedance and the impedance ratio (Z(1 kHz)/Z(100 kHz)) decreased with aging but showed animal-to-animal variability, limiting their predictive value.
• Meat electrical anisotropy decreased with increasing frequency and with aging, showing a significant correlation with mechanical resistance.

Conclusions:

• Electrical anisotropy is a potential, though not yet fully accurate, parameter for evaluating meat aging.
• Further improvements are needed to enhance the accuracy of electrical anisotropy measurements for practical application in meat quality assessment.