MICROBIAL FOOD SAFETY A FOOD SYSTEMS APPROACH

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MICROBIAL FOOD SAFETY A FOOD SYSTEMS APPROACH Charlene Wolf-Hall and William Nganje

Chapter 2: Ecological Concepts of Foods and Definitions of Pre- and Post-Harvest

Key Questions What is ecology, and how are these concepts applied to foods? How are microorganisms affected by the environmental factors in foods? What is hurdle technology? What do pre- and post-harvest mean?

Ecological Terms Ecology - The branch of biology that deals with the relations of organisms to one another and to their physical surroundings. Ecosystem – A functional system which includes the organisms of a natural community together with their environment. Microbiome - The full collection of microbes (bacteria, fungi, virus, etc.) that naturally exist within a particular biological niche such as an organism, soil, a body of water, etc.

Microbiomes of Food Food is not sterile The majority of microorganisms in food microbiomes are harmless

Bacterial Growth Curve

Modeling Microbial Growth and Survival www.combase.cc

Microbial Food Safety Terminology Infective Dose - The number of pathogenic microorganisms necessary to cause infection in a host. Secondary Metabolites - Chemicals synthesized by organisms that do not appear to have a direct role in the organism's growth. Antibiotics and mycotoxins are examples of secondary metabolites. Toxin - A substance that has toxicity.

FAT TOM F = Food A = Acidity T = Time T = Temperature O = Oxygen M = Moisture National Restaurant Association Educational Foundation (2012) ServSafe CourseBook, 6th edition.

Hurdle Technology - The strategic manipulation of environmental factors to control microorganisms in foods, allowing for better quality food production Bacterial growth and reduction curves depicting Escherichia coli O157:H7 (USDA, 2003). (A) Under aerobic conditions in broth culture at 25°C, pH 7, 0.5% sodium chloride and initial concentration of 3 colony forming units (CFU)/ml (time is the hurdle). (B) The same conditions except for a temperature of 5°C (time and temperature are hurdles). (C) The same conditions as (B), but with a lower pH of 4.5 (time, temperature and pH as hurdles). (D) Survival during fermentation of Soujouk-style fermented sausage (time, temperature, pH, oxygen content, additives, and competing microflora as hurdles).

Changes to Environmental Conditions Pre-Harvest - Occurring before a crop or livestock for food are harvested. Post-Harvest - The handling of food crops or animals immediately after the harvest step.

THANK YOU Name: Charlene Wolf-Hall & William Nganje Email: charlene.hall@ndsu.edu & William.Nganje@ndsu.edu