-4 degrees. That is, in the fresh-keeping cabinet of the refrigerator.

Generally, the sample retention time is 48 hours, and the sample retention amount is not less than 111 grams for each dish, so the samples should be kept separately without confusion; After 48 hours, pour the remaining vegetable samples into the trash can, and thoroughly clean and disinfect the sample box to avoid cross-contamination.

It should also be noted that the dishes in the sample box must be cooled before they can be covered and put into the refrigerator. Hot dishes cannot be put into the refrigerator. On the one hand, it will increase the temperature in the refrigerator; on the other hand, it will accelerate the deterioration of the samples, which will not achieve the expected effect.

Extended information:

1. When selecting a kitchen, the following two factors should be considered: First, we should pay attention to preventing the pollution of the kitchen environment by neighboring enterprises and try our best to avoid the discharge of "three wastes" (waste water, waste residue and waste gas) from enterprises. Second, the kitchen is best not to be located in the basement, because the basement is not conducive to ventilation, lighting, smoke and dust removal and moisture-proof, and food is also prone to mildew and rot.

2. The kitchen should take measures to eliminate harmful insects such as flies, rats, cockroaches and breeding conditions.

3. Every kitchen must deal with garbage and waste according to hygiene regulations. Outdoor trash cans should be easy to clean, prevent insects and mice from entering, prevent sewage from leaking, and treat them in time to protect the environment from odor, insects and bacteria pollution.

The garbage bins (boxes) in the kitchen must be covered with lids and have enough capacity to hold garbage. Bagging and management must be carried out according to hygiene requirements, and cleaning should be carried out in time. Buckets and boxes should be cleaned inside and outside with hot water and detergent. This work should be done at an appropriate time.

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