Tangshan frozen fruits and vegetables processing supplier tells you about the discoloration phenomenon of frozen fruits and vegetables

After being stored for a period of time, frozen fruits and vegetables exhibit discoloration, resulting in a change in their quality. Below, we will analyze the discoloration phenomenon of frozen fruits and vegetables:

For frozen fruits and vegetables, discoloration can occur during the frozen processing stage, as well as during the frozen storage and circulation stages. Mainly due to the role of microorganisms, and the growth and reproduction of microorganisms require a suitable temperature range. Above or below this temperature will promote the inhibition, cessation, and even death of microbial life activities. Quick frozen fruits and vegetables use artificial refrigeration technology to reduce the temperature of fresh fruits and vegetables, which can greatly inhibit microbial activity and enzyme activity, and can greatly prevent spoilage.

Frozen foods such as frozen fruits and vegetables generally experience changes in color, flavor, and nutrition. Before freezing, measures are taken to inhibit or inactivate enzyme activity to reduce product quality changes caused by the presence of enzymes.

However, currently, frozen fruits are mostly processed, and there may be discoloration phenomena such as light colored fruits and vegetables or sliced fruits and vegetables turning red or black in color, green fruits and vegetables gradually losing their green color and turning gray green, and fruits and vegetables products losing their original color or deepening their original color. The main reason is that fruits and vegetables contain polyphenol oxidase enzymes, which oxidize phenols into red and black quinone compounds under the action of oxygen, and chlorophyll enzymes oxidize and decompose chlorophyll. In addition, the presence of acidic substances in processing water can also cause the product to lose its green color, and the presence of metal ions can also catalyze the browning of the product. The leakage of refrigerant can also cause discoloration.

Therefore, in order to ensure the quality of frozen fruits and vegetables, it is necessary to pay attention to each step during the processing of frozen fruits and vegetables, strictly follow the standards, and not take any details lightly.