J.N. Since bacteria are easy to grow in the lab, their growth has been studied extensively. Microbial growth •The microbial growth is the increase in number of cells rather than in size of individual cells. Growth Curve. Inhibition of Microbial Growth. Bacterial growth curve and its significance. Sofos, in Encyclopedia of Food Safety, 2014. Preserving agents that increase the acidity of food, such as citric acid, are commonly added to help prevent bacterial growth and allow for longer storage. 9. Method of Obtaining Bacterial Growth Curve For example, bacteriostatic treatments inhibit the growth of bacteria, whereas fungistatic treatments inhibit the growth of fungi. Temperature is the most efficient means to control microbial growth. Factors affecting microbial growth in food (a) Intrinsic factors: These are inherent in the food. Vol. 2 (Supplement), 2003 —COMPREHENSIVE REVIEWS IN FOOD SCIENCE AND FOOD SAFETY 21 Chapter III Factors that Influence Microbial Growth ability to participate in chemical/biochemical reactions, and its availability to facilitate growth of microorganisms. Microbial growth on meat products, as well as other foods, is affected, not only by the type and level of initial contamination but also by various factors associated with the product (intrinsic) or its environment (extrinsic). Methods and Results: The influence of temperature and pH was studied through fermentation and modelling. Vinegar and lemon juice have a similar effect. The acidity of food is also an important factor affecting bacterial growth 1. When plotted on a graph, a distinct curve is obtained referred to as the bacterial growth curve. Factors affecting Microbial growth Physical factors •pH •Temperature •Osmotic pressure •Hydrostatic pressure Although each factor affecting growth is considered separately in the following discussion, these factors occur simultaneously in nature. Factors that Influence Microbial Growth December 31, 2001 Evaluation and Definition of Potentially Hazardous Foods 1. Aims: To study the effect of different fermentation conditions and to model the effect of temperature and pH on different biokinetic parameters of bacterial growth and exopolysaccharides (EPS) production of Streptococcus thermophilus ST 111 in milk‐based medium. They include: Hydrogen ion concentration (pH), moisture content, nutrient content of the food, antimicrobial substances ad biological structures. They include: pH, water activity, oxidation reduction potential, nutrient content, antimicrobial contents, biological structure (b) Extrinsic factors: Are factors external to the food that affect microbial growth… Bacteria have a minimum, optimum, and maximum temperature for growth and can be divided into 3 groups based on their optimum growth temperature: psychrophils, mesophils, thermophils, or … 17.2: Factors that Influence Bacterial Growth - Biology LibreTexts Factors that determine whether a particular treatment is -cidal or -static include the types of microorganisms targeted, the concentration of the chemical used, and the nature of the treatment applied. Factors affecting microbial growth in food (a)Intrinsic factors: These are inherent in the food. Temperature. 1. 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