Among the factors that facilitate the development of bacteria we include?


Question by: Dr. Damiano Vitale | Last updated: September 20, 2021

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the storage temperature; relative humidity; the presence and concentration of gas; the presence and activity of other microorganisms.

What pH favors the development of bacteria?

Bacteria grow in environments with pH between 4.5 and 9, with an optimum between 6.5 and 7.5.

What are the factors that influence the development of food altering microorganisms?

The growth of microorganisms in food is strictly influenced by the nature of nutrients (sources of carbon and nitrogen), by the presence of water, growth factors and inhibitors and by some parameters that are inherent in the tissues of plants and animals, such as pH , water activity or potential …

What do bacteria need to multiply?

They also need a suitable temperature: some bacteria prefer high temperatures (“thermophilic”) and grow even at + 75 ° C, others are defined “mesophilic” and have optimal growth temperatures between + 32 and + 37 ° C , still others are defined as “psychrophils” and also grow at close temperatures …

What is not conducive to microbial multiplication?

Most bacteria grow best in foods that are neither too acidic nor too alkaline. In general, an acidic food with a ph lower than 4.2 is able to prevent its multiplication. The temperature has a decisive influence on the rate of bacterial growth.

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Which of these factors influence survival and microbial multiplication?

The effect of pH on microbial growth can be influenced by the interaction with other parameters, such as water activity (aw), salt concentration, process and storage temperature, presence of antimicrobials, buffering capacity of the food, etc.

What promotes microbial multiplication?

Temperature. The temperature greatly influences the speed of chemical reactions, the metabolism and consequently also the growth of microorganisms. By gradually increasing the temperature, the speed of the reactions increases until it reaches a maximum value.

At what temperature do bacteria grow easily?

Thermophilic bacteria: grow at high temperatures (47-70 ° C, optimum temperature: 50-55 ° C) Mesophilic bacteria: grow at intermediate temperatures (20-45 ° C, optimum temperature 30-37 ° C)

At what temperature do bacteria grow?

Above + 4 / + 5 ° C instead the temperatures of growth and bacterial proliferation begin. These temperatures are the most dangerous. At the temperature of 65 ° C there is the survival limit for many species: once this temperature is exceeded, the microorganisms present in the food begin to die.

What eats bacteria?

Bacteria that, like plants, exploit solar energy are called photoautotrophs, while chemoautotrophs are those that derive energy from chemical reactions. Bacteria that need to feed on already synthesized organic molecules, as do all animals, are called heterotrophs.

Which process alters the nutritional value of a food the least?

In general, however, breathing is a negative process as it reduces the nutritional and organoleptic properties of the food (eg.

What foods cause salmonella?

raw (or undercooked) eggs and egg-based derivatives. raw milk and raw milk derivatives (including powdered milk) meat and derivatives (especially if lightly cooked) sauces and salad dressings.

What core temperature guarantees the microbiological safety of a food?

Generally, reaching a core temperature equal to or greater than + 75 ° C is sufficient to guarantee the microbiological safety of the food.

Which bacterium produces cooking-resistant toxins?

However, the Listeria bacterium can contaminate foods after their production (for example, contamination can occur after cooking food but before packaging it).

What are the components that favor the development of germs in food?

Keeping food “warm”, at a temperature of 30-40 ° C, on the other hand, favors the development of pathogenic germs. A temperature of 60-65 ° C, on the other hand, allows the destruction of most of the microbes, even if the spores survive at temperatures above 100 ° C.

How long does it take for a bacterium to reproduce?

Many bacteria have generation times of between 1 and 3 hours, but some microorganisms are also known that grow very quickly, dividing in about ten minutes, and others that have generation times of several hours or even days.

Where do bacteria proliferate?

Bacteria are present in every environment, even in the most extreme environments, where no other life form could survive. They can be found in the air, water, soil, ocean floors, deserts, rocks, frozen permafrost soil as well as in our bodies.

How do bacteria proliferate?

Bacteria reproduce through a mechanism called cleavage, whereby a bacterial cell divides into two daughter cells, identical to the parent cell. Bacteria can be taken from the environment or even from an infected individual to be grown in the laboratory.

At what temperature is it possible to eliminate all pathogenic germs present in a food product?

Cooking at internal temperatures of 70 ° C to 100 ° C kills most of the existing pathogens; Keep food hot at a temperature equal to or higher than 65 ° C or cool it to a temperature equal to or lower than 7 ° C; Keep leftovers in the fridge and consume them within 2 to 3 days.

What is the dangerous temperature range for food storage?

To avoid the growth of potentially dangerous bacteria, food must be kept at temperatures outside the range 10 ° C – 60 ° C (the so-called “danger zone”).

At what temperature should cooked food be kept to be eaten hot?

Cooked foods to be eaten hot, such as ready meals, chickens, need to be kept at a temperature of around 60 ° – 65 °.

How many bacteria are formed in 2 hours?

For the third property it is easy to calculate the number of bacteria for every full hour: after 1 hour there are 2000 bacteria, after 2 hours there are 4000 bacteria, after 3 hours there are 8000 bacteria, etc.

What degree of acidity favors bacterial multiplication?

growth: generally molds and yeasts are more sympathetic to acidic materials, bacteria prefer environments with a neutral pH (over 7). Temperature: There are bacteria capable of reproducing even at low (7-10 ° C) or high temperatures (50-60 ° C) or heat resistant up to over 100 ° C.

What Factors Affect Bacterial Growth in Food?

the storage temperature; relative humidity; the presence and concentration of gas; the presence and activity of other microorganisms.

What are the foods most favorable to bacterial multiplication?

Foods in which microorganisms proliferate

The most suitable foods for the proliferation of bacteria are: those that have a certain degree of humidity optimal conditions for microbial development (neutral pH for bacteria, slightly acidic for yeasts and molds) suitable temperature (psychrophils, mesophiles, thermophiles)


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