Asked by: Grit Hoque
medical health infectious diseases

What are the factors affecting the growth of microorganisms in food?

Last Updated: 28th January, 2020

Factors affecting microbial growth in food (a) Intrinsic factors: These are inherent in the food. 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.

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Likewise, people ask, what are the factors affecting the growth of microorganism?

The growth of microorganisms is influenced by various physical and chemical factors of their environment. ? Physical factors- Temperature, pH, osmotic pressure, hydrostatic pressure and radiation. ? Chemical factors- Oxygen, carbon, nitrogen, phosphorus, sulfur, etc.

Subsequently, question is, what are the intrinsic factors for the microbial growth? The growth depends on the availability of nutrients and other factors present over there. (i) Intrinsic Factors : pH, moisture etc. (ii) Extrinsic Factors : Temperature, Oxygen etc. Microbial cells require water in an available form to grow in food products.

Similarly one may ask, what are the six factors that affect the growth of bacteria?

Factors That Affect the Growth of Microorganisms

  • Nutrients. All microorganisms need food.
  • Temperature. In general, the higher the temperature, the more easily microorganisms can grow up to a certain point.
  • pH Levels.
  • Moisture.
  • Elements Present.

What inhibits the growth of microorganisms?

Is a drug or chemical that inhibit the growth and reproduction of microorganisms. ? A bacteriostatic agent is one that specifically inhibits the metabolism and reproduction of bacteria.

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How does temperature affect the growth of microorganisms?

Physical Factors that Control Microbial Growth. Generally,an increase in temperature will increase enzyme activity. But if temperatures get too high, enzyme activity will diminish and the protein (the enzyme) will denature. On the other hand, lowering temperature will decrease enzyme activity.

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How does oxygen affect the growth of microorganisms?

Bacteria that require oxygen to grow are called obligate aerobic bacteria. In fact, the presence of oxygen actually poisons some of their key enzymes. Some bacteria (S. pneumoniae) are microaerophilic or aerotolerant anaerobes because they grow better in low concentrations of oxygen.

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How pH affects the growth of microorganisms?

Moderate changes in pH modify the ionization of amino-acid functional groups and disrupt hydrogen bonding, which, in turn, promotes changes in the folding of the molecule, promoting denaturation and destroying activity. The optimum growth pH is the most favorable pH for the growth of an organism.

Aamir Mosandl


What is growth of microorganisms?

The growth of microorganisms is a highly complex and coordinated process, ultimately expressed by increase in cell number or cell mass. In general, when all other conditions are kept ideal, growth of the microorganisms is dependent on the substrate (nutrient) supply.

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Where are growth factors produced?

Some growth factors are similar to hormones in that they can be secreted into the blood stream, which carries them to their target tissues. However, whereas the production of hormones is limited to glandular tissue, growth factors can be produced by many different types of tissue.

Tisha Jessi


Why is Fattom important?

FAT TOM is an acronym for food, acidity, time, temperature, oxygen, and moisture. These are the six conditions in which food borne pathogens require to grow and spread. This acronym is great to remember these conditions and to prevent the growth of food borne pathogens which can cause food borne illnesses.

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What is the best way to limit the growth of bacteria in food?

The best way to limit bacteria in food is to cook the food to 165 degrees or better. This kills off harmful bacteria making the food safe to eat. If there is any food left over after eating, cooling it and refrigerating it within 2 hours after serving it will keep the bacteria count down.

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What are the extrinsic factors?

Extrinsic factors are known to make the bowler more susceptible to injury, especially in the presence of intrinsic factors.Intrinsic, or person-related, factors include muscle strength, flexibility, balance and biomechanics.

Villaviciosa Jahniche


What is implicit factor?

Implicit factors imply some connection between items in a sample. If your sample has a lack of independence, that's an indication that there may be one or more implicit factors in your sample. The word “factor” is extremely broad, and it means that practically anything can be an implicit factor.

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What is intrinsic and extrinsic growth?

Explanation: The intrinsic growth factors are mediated due to internal balance of the body these includes the role of internal secretions like enzymes and hormones over the organism whereas the external growth factors comes from the environmental factors.

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What are the biotic factors that affect microbial growth?

There are a variety of environmental factors that affect microbial growth. The most important physical factors are pH, temperature, oxygen, pressure, and salinity.

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What are the factors of food spoilage?

Factors that affect food spoilage include:
  • Microorganisms.
  • Enzymes.
  • Air.
  • Light.
  • Insects, Rodents, Parasites and Other Creatures.
  • Physical Damage.
  • Temperature.
  • Time.

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What are the intrinsic parameters of food?

Intrinsic parameters of food include pH, moisture, oxidation-reduction potential (presence or absence of oxygen), nutrient content, occurrence of antimicrobial constituents, and biologic structures.

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How does moisture affect microbial growth?

Studies have indicated that the growth of microorganisms, such as fungus and bacteria, completely cease when temperatures reach < -18°C/0°F. Thus, decreasing temperature and moisture (relative humidity), creates a less hospitable environment for microorganisms to grow.

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What factors influence the microbial community found on fresh fruits and vegetables?

The authors suggest several factors that may contribute to the differences they observed, including farm locations, storage temperature or time, and transport conditions. These surface bacteria on produce can impact the rate at which food spoils, and may be the source of typical microbes on kitchen surfaces.

Anabela Pauhl


How do food preservatives affect the growth of microorganisms?

Preservatives can be grouped into three general types: antimicrobials that block growth of bacteria, molds or yeasts; antioxidants that slow oxidation of fats and lipids that leads to rancidity, and a third type that fights enzymes that promote the natural ripening that occurs after fruits or vegetables are picked.