A Complete course in canning and related processes by Anthony Lopez

By Anthony Lopez

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E. an offspring, they are a minimised dormant state of the bacterium. Endospores have a central core of cytoplasm containing DNA and ribosomes that is protected by an impermeable and rigid coat. They show no detectable metabolism and can survive extreme physical and chemical stresses, such as high levels of UV light, gamma radiation, detergents, disinfectants, heat, pressure, and desiccation. In this dormant state, bacteria may remain viable for thousands of years and can even survive exposure to the vacuum and radiation in space.

4 Effect of temperature on growth of micro-organisms In actively growing stages, most micro-organisms are readily killed by exposure to temperatures near the boiling point of water; bacterial spores, however, are more heat resistant than their vegetative cells. Bacteria can be classified according to temperature requirements for growth. • Psychrophiles have an optimum between 12 and 15 °C but can grow up to 20 °C. • Psychrotrophs have an optimum between 20 and 30 °C but can grow as low as 0 °C.

Can grow in high sugar concentrations and can cause spoilage of jams and jellies. Zygosaccharomyces. 62. 5 Important bacteria in the food industry Bacteria are the most important group of food poisoning and food spoilage organisms that must be considered in heat-processed foods (Pflug, 2005). Bacteria can be divided into groups depending on the temperature at which they grow. 1 Thermophiles Thermophiles are micro-organisms that grow optimally at between 55 and 65 °C but can grow between 40 and 90 °C.

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