Abstract

Spoilage or pathogenic bacteria in meats are influenced by extrinsic (temperature, atmosphere), intrinsic (pH, water activity), or process factors (preservatives) and by environmental changes. Duration of ‘lag’ phase and slope of ‘log’ phase are derived from laboratory experiments, by fitting ‘primary models.’ These data are then described as a function of as few external factors as possible. These ‘secondary models’ allow microbial responses at various combinations of external factors to be ‘predicted.’ Databases and software packages allow assessment of food safety and shelf life and are essential to establish Food Safety Objectives and to conduct Quantitative Microbial Risk Assessments.

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