Introduction to bactericidal preservatives
Biocidal preservatives are a class of chemicals used to kill or inhibit the growth of microorganisms. They play an important role in keeping food safe and extending its shelf life.

Bactericidal preservatives can be divided into several types based on their origin and chemical properties. Some of them are natural substances, while others are synthetic compounds. Depending on the application, bactericidal preservatives can be divided into several categories, such as food, industrial and medical. The details are as follows:

Classification
Classification by source: Natural germicidal preservatives are mainly derived from plants, animals or microorganisms, such as citric acid, lactic acid, etc. Synthetic germicidal preservatives include a variety of organic and inorganic compounds.
They are classified according to their chemical properties: Oxidative bactericidal preservatives destroy the cellular structure of microorganisms due to the release of oxygen, and reducing bactericidal preservatives inhibit the growth and reproduction of microorganisms due to reduction reactions.
Mechanism
Denaturation of proteins. Bactericidal preservatives can react with proteins of microorganisms, leading to denaturation of proteins and, thus, inactivation of microorganisms.
Enzyme inhibition. Bactericidal preservatives can affect the activity of enzymes in microbial cells and influence their metabolic pathways, thereby inhibiting the growth and reproduction of microorganisms.
application
Preservation in food products: Potassium sorbate, sodium benzoate, etc. can be used. These substances can effectively extend the shelf life of food products and are harmless to the human body when used in certain doses.
Preservation of industrial products: for example, preservatives used in coatings, adhesives and textiles such as 2-methyl-4-isothiazolin-3-one (MIT) and 5-chloro-2-methyl-4-isothiazol chlorin-3-one ( CMI). These substances have a broad-spectrum bactericidal effect and are safe for the human body and the environment.
Influencing factors
Effect of pH: The effectiveness of some germicidal preservatives may vary at different pH values.
Effect of temperature. Increasing the temperature usually increases the effectiveness of bactericidal preservatives, but may also affect their stability.
safety
Toxicity and safety assessment: The selection of bactericidal preservatives requires consideration of their toxicity and potential effects on the human body. For example, BIT is an industrial sterilizing preservative that is considered relatively safe, with low toxicity and easy biodegradability.
It should be noted that when using germicidal preservatives, relevant regulations and standards should be strictly followed to avoid excessive use to avoid adverse effects on human health. In addition, to achieve the best antiseptic effect, suitable bactericidal preservatives should be selected according to the specific environment and conditions of use.

Here are some common biocides and preservatives and their characteristics:

Chlorines: They have strong oxidizing properties and are often used to purify water and disinfect medical equipment.
Peroxide: Has strong oxidizing power, but its chemical properties are unstable. Please pay attention to safety when using it.
Benzoic acid and its salts. Commonly used in food preservatives, they can effectively inhibit the growth of mold and yeast.
Potassium sorbate: is a food preservative and has a good inhibitory effect on bacteria and mold.
To summarize, we can say that sterilization and preservatives are an integral part of modern life. Correct and reasonable use ensures the quality and safety of the product, as well as extends its service life. When selecting germicidal preservatives, full consideration should be given to their effectiveness, safety and environmental impact, and relevant laws and regulations should be followed to ensure their scientific and safe application in various fields.