How long can pure milk be kept at room temperature after opening?

Case 1: For ordinary bagged pure milk, you cannot drink it after 24 hours after opening. Because pure milk is a highly nutritious substance, it is easily contaminated by bacteria in the air and causes deterioration.

Situation 2: For Tetra Pak boxed pure milk, if it is opened and placed in the refrigerator, it can be drunk after 24 hours, but it is recommended to drink it within three days.

Situation 3: For Tetra Pak boxed pure milk, if it is opened, it is not placed in the refrigerator. You cannot drink it after 24 hours. At this time, the milk may have deteriorated, affecting human health.

Nutritional characteristics

Milk and its products are one of the important sources of protein, calcium, phosphorus, vitamin A, vitamin D and vitamin B2 in the diet.

Fresh milk is mainly a complex latex composed of water, fat, protein, lactose, minerals, vitamins, etc. The water content accounts for 86% to 90%, so its nutrient content is different from other foods. The comparison is relatively low. The average specific gravity of milk is 1.032, and the specific gravity is related to the solid content in the milk. Except for the relatively large changes in fat content, the various components of milk are basically stable, so the specific gravity can be used as a simple indicator to evaluate the quality of fresh milk.

Reference for the above content: Baidu Encyclopedia-Milk