UHT Introduction
UHT, Ultra High Temperature treated
Ultra high temperature instantaneous sterilization, 135-140 ℃, 4-10 seconds, is a sterilization process for fresh milk processing, which does not require refrigeration storage below 10 ℃ and can have a shelf life of up to 1-6 months
Currently, almost all liquid milk in Tetra Pak brick/pillow packaging (commonly known as paper packaging) on the market uses UHT
Milk is highly loved by people because it is rich in nutrients. But as a result, milk is prone to spoilage and difficult to store.
In order to ensure the freshness and safety of milk consumption, it is necessary to sterilize and safely package the milk.
Barrier packaging of UHT milk
Fat, protein (amino acids), and vitamins in milk are easily oxidized by oxygen and lose their nutritional ＆#118alue and fresh taste.
There are two effective ways to prevent oxidative deterioration:
1. Reduce the circulation and storage temperature (usually 0-5 ℃), thereby reducing the oxidation rate.
2. Use barrier packaging materials to block the passage of oxygen into the interior of the packaging
UTH milk is mainly packaged with Tetra Pak bricks/pillows, commonly known as paper packaging
Comparison of Pasteurized Milk and UHT Milk
The liquid milk currently sold on the market includes two types: pasteurized milk and ultra-high temperature instant sterilized (UHT) milk. Normal temperature milk, due to its long shelf life, is prone to forming a national brand. Pasteurized milk is not suitable for long-distance transportation and can only be sold within a certain geographical range.
However, due to the high pollution of domestic raw milk in the actual process, enterprises generally adopt high-strength sterilization.
1. UHT milk
UHT milk, also known as room temperature milk, high-temperature milk, ultra-high temperature instant disinfection milk, and ultra-high temperature heat treated milk, is produced by heating at 137-145 degrees Celsius for 4-15 seconds. Because of high temperature treatment, some thermolabile nutrients such as vitamins in milk will be destroyed, lactose in milk will also be coked, and certain Maillard reaction will occur between protein and lactose, which will brown milk and destroy the original flavor of milk.
The identification method for UHT milk is: Tetra Pak brick (pillow) packaging (commonly known as paper packaging), sold in boxes in supermarkets, without refrigeration, with a shelf life of 1-6 months.