How fast does orange juice break down?

The rate at which orange juice breaks down depends on several factors, including temperature, exposure to air, and the presence of bacteria or enzymes. Here's a general overview of how orange juice breaks down:

1. Enzymatic Browning: Orange juice contains enzymes called polyphenol oxidases, which can react with oxygen to cause browning. This reaction is accelerated by exposure to air and can lead to discoloration and off-flavors.

2. Oxidation: The vitamin C (ascorbic acid) present in orange juice is susceptible to oxidation, which can cause the juice to lose its nutritional value and develop an off-flavor.

3. Bacterial Growth: Orange juice provides a favorable environment for bacterial growth, especially at warm temperatures. Bacteria can break down the sugars and other components of the juice, leading to spoilage and souring.

4. Temperature: The higher the temperature, the faster orange juice will break down. Keeping the juice refrigerated (below 40°F or 4°C) can slow down the breakdown process and extend its shelf life.

Generally, fresh orange juice that has not been treated or preserved can last for about 2-3 days in the refrigerator. However, pasteurized or commercially produced orange juice with added preservatives may have a longer shelf life, typically around 7-10 days.

To ensure the best quality and safety, it is important to follow the storage instructions on the product label and consume orange juice within the recommended time frame.