In this work, one-step growth models using hyperspectral imaging (HSI) (400–1 000) nm were successfully developed in order to estimate the microbial loads, minimum growth temperature (Tmin) and maximum specific growth rate (μmax) of Brochothrix thermosphacta in chilled beef at isothermal temperatures (4–25) ℃. Three different methods were compared for model development, particularly using (Model I) the predicted microbial loads from partial least squares regression of the whole spectral variables; (Model II) the selected spectral variables related to microbial loads; and (Model III) the first principal scores of HSI spectra by principal component analysis. Consequently, Model I showed the best ability to predict the microbial loads of B. thermosphacta, with the coefficient of determination (Rv2) and root mean square error in internal validation (RMSEV) of 0.921 and 0.498 (lg (CFU/g)). The Tmin (–12.32 ℃) and μmax can be well estimated with R2 and RMSE of 0.971 and 0.276 (lg (CFU/g)), respectively. The upward trend of μmax with temperature was similar to that of the plate count method. HSI technique thus can be used as a simple method for one-step growth simulation of B. thermosphacta in chilled beef during storage.
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Food Science and Human Wellness
Available online: 26 February 2024
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