MIC 320 Lecture Notes - Lecture 3: Enterococcus, Psychrophile, Clostridium
27 Oct 2016
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Lecture 4: intrinsic and extrinsic parameter of foods that affect microbial growth: extrinsic parameters the storage environment that affect both the foods and their m/o"s. Bacteria: bacteria as a group can grow at a wide temperature range from below 0 c to over 100 c, each organism has its own temperature preference, three groups of bacteria important in foods. Psychrotroph: optimum 20-30 c but grow at < Pseudomonas and enterococcus are the most common ones. Major cause of spoilage in refrigerators: psychrophile love low temperature. Mesophiles: optimum 30-40 c but grow at 20- Molds: grow over wide ranges of temperature. Yeasts: psychrotrophic and mesophilic but not thermophilic. Rh in the environment may alter the aw of foods. Rh will determine the growth of surface microorganisms. Gases in the environment will impact eh of foods and the growth of surface m/o"s: vacuum packed food anaerobic environment anaerobes, non-vacuum-packed food aerobic environment aerobes. Some gases have antimicrobial activities and are used in.
