Kinetics of Tropomyosin Denaturation as a Predictive Model for Verifying Thermal Processing of Beef Products

Authors: Chen, Fur-Chi¹; Hsieh, Y.-H. Peggy²; Bridgman, Roger C.³; Kilonzo-Nthenge, Agnes¹

Source: Journal of Food Protection®, Volume 69, Number 10, October 2006 , pp. 2447-2453(7)

Publisher: International Association for Food Protection

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Abstract:

An enzyme-linked immunosorbent assay (ELISA) was developed to study thermal denaturation of tropomyosin (Tm) using the time-temperature requirements for cooked beef. The ELISA employed a monoclonal antibody (MAb 2C9) raised against bovine Tm for quantifying residual Tm in muscle extracts. The specificity of MAb 2C9 to bovine Tm was demonstrated by Western blot and the analytical validity of ELISA was confirmed by dot blot. Thermal denaturation of Tm, in the temperature range between 54.4 and 70.0°C, showed first-order dependency. Kinetic parameters of Tm denaturation were derived from isothermal heating of beef muscle extract at 54.4, 57.2, 60.0, and 62.8°C. Temperature dependency of the rate constant (k) was demonstrated by Arrhenius plot; the activation energy (E_a) of Tm denaturation was determined to be 484 kJ·mol⁻¹. A mathematic model describing the impact of the heating time-temperature on Tm denaturation was developed. Predicted Tm from the integrated time-temperature model agreed closely with the measured Tm in dynamically heat-processed beef samples. Percent errors between the measured and the predicted values ranged from −5.1 to 5.3%. The kinetic model provides an accurate and reproducible prediction of the impact of actual heating time-temperature on residual Tm in cooked beef. The MAb-based ELISA and kinetic model developed in this study have the potential to be adapted by the meat industry as a quality control tool.

Document Type: Research article

Affiliations: 1: Institute of Agricultural and Environmental Research, Tennessee State University, Nashville, Tennessee 37209, USA 2: Department of Nutrition, Food and Exercise Sciences, Florida State University, Tallahassee, Florida 32306, USA 3: Hybridoma Facility, Auburn University, 3410 Skyway Drive, Auburn, Alabama 36830, USA

Publication date: 2006-10-01

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Kinetics of Tropomyosin Denaturation as a Predictive Model for Verifying Thermal Processing of Beef Products

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