Seven ways to preserve food (seven common ways to preserve food)

1. Drying: Drying is mainly to control the moisture in food and reduce water activity, so as to achieve the purpose of preservati

Seven ways to preserve food (seven common ways to preserve food)

1. Drying: Drying is mainly to control the moisture in food and reduce water activity, so as to achieve the purpose of preservation.

2. Freezing: lowering the temperature to inhibit the biochemical activities of the food itself and the growth of microorganisms, thereby achieving the purpose of preservation.

3. Heat treatment: By heating, the food quality is denatured to meet people's needs, and microorganisms are killed, so as to achieve the purpose of preservation.

4. Controlled atmosphere storage: It is mainly used for the preservation of plant foods such as fruits and vegetables. By adjusting the gas composition in the sealed room, it can inhibit the post-ripening process of plant foods and extend the storage period.

5. Pickling: Pickle food with salt, sugar or wine to change the osmotic pressure of the food, and use other chemicals to inhibit the growth of microorganisms, thereby achieving the purpose of preservation.

6. Vacuum packaging and sealing: remove the air to put the food in a vacuum state, inhibit the growth of microorganisms, and achieve the purpose of preservation.

7. Increase the hydrogen ion concentration: Most bacteria cannot grow and reproduce normally below pH 4.5, so the method of increasing the hydrogen ion concentration can be used for antisepsis. Vinegar pickling is adding vinegar to food, such as common vinegar pickling and acid fermentation. This method is often used in fruits and vegetables, such as pickled cucumbers, sauerkraut, etc.