1. Dehydrated synthetic medium:
A list of valid culture media catalogues should be kept. The list should include the following: â‘ container tightness inspection; â‘¡ record the date of first opening; â‘¢ sensory inspection of the contents. The quality of the dehydrated synthetic medium after opening depends on the storage conditions. The quality of the dehydrated medium can be judged by observing the fluidity, uniformity, agglomeration and color change of the powder. If it is found that the medium is damp or has obvious changes in physical properties, it should not be used again.
2. Commercial ready-to-use medium: it should be stored and used strictly in accordance with the storage conditions, expiration date and use methods provided by the supplier.
3. Laboratory-made medium:
It should be stored under conditions that ensure that its ingredients will not change, that is, protected from light and dry storage, if necessary, stored in a refrigerator at 5 ℃ ± 3 ℃. It is generally recommended that the plate should not exceed 2 to 4 weeks, and the medium in bottle and test tube should not exceed 3 ~ 6 months, unless certain standards or experimental results indicate that the shelf life is longer than the above. It is recommended that the unstable additives to be added should be used immediately, unless some standards or experimental results indicate that the shelf life is longer; the solid medium containing active chemicals or unstable components should also be used immediately. Times melted. Storage should establish a valid period of validity. Observe the medium for color changes, evaporation / dehydration, or microbial growth. When such changes occur, use should be prohibited.
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