Milk can be preserved for longer periods by following some basic methods:
Refrigeration: The best way to preserve milk is to keep it refrigerated at a temperature between 33°F to 40°F (0.5°C to 4°C). This slows down the growth of bacteria and keeps the milk fresh for longer.
Use airtight containers: Store milk in airtight containers to prevent the entry of air and the growth of bacteria. Glass jars, plastic bottles, or food-grade plastic bags are good options.
Pasteurization: Pasteurization is the process of heating milk to a specific temperature for a certain period to kill harmful bacteria. Most milk sold in stores is pasteurized, which extends its shelf life.
Ultra-pasteurization: Ultra-pasteurization is a process of heating milk to an even higher temperature than regular pasteurization. This method extends the shelf life of milk for up to several months when it is stored under refrigeration.
Freezing: Milk can be frozen for up to six months. However, it's important to note that freezing milk can cause it to separate and change in texture. It's best to freeze milk in airtight containers, leaving some room at the top for expansion.
UHT (Ultra-high temperature) processing: UHT processing is a method of heating milk to a very high temperature for a very short period, then packaging it in a sterile, airtight container. This process allows milk to be stored at room temperature for up to six months without spoiling.
By following these methods, you can preserve milk for as long as possible while maintaining its quality and freshness.