Vitamin C storage conditions?

Vitamin C (referred to as vitamin C) is a relatively easy to be oxidized substances, its storage conditions mainly have the following points:
First, the temperature
Vitamin C is suitable for storage in a cool place, the ideal storage temperature is below 20 ° C. Because the temperature is too high will speed up the oxidation process of vitamin C. For example, in the hot summer, if the vitamin C tablet is placed in the car in direct sunlight, the temperature inside the car may reach 50-60 ° C, in such a high temperature environment, vitamin C will be rapidly oxidized and decomposed, thus losing its efficacy.
Second, humidity
The ambient humidity should be moderate, and should avoid storing in a place that is too humid. High humidity may cause vitamin C to deliquize and deteriorate. Like in the southern Meiyu season, the air humidity can often reach 80%-90%, if the vitamin C drugs are not sealed well, it is easy to absorb water and deteriorate. Generally speaking, it is more appropriate to keep the indoor relative humidity at 40%-60%.
Third, lighting
Vitamin C needs to be stored away from light. Because light accelerates the oxidation of vitamin C, its structure is destroyed. For example, vitamin C tablets packaged in transparent plastic bottles, if placed in a windowsill for a long time in a place with strong light, the vitamin C will gradually turn yellow, which is a manifestation of the oxidation of vitamin C, and its efficacy will be reduced. It is best to store vitamin C in an opaque container or in a dark corner of a cabinet.
Fourth, packaging
For preparations such as vitamin C tablets, the original packaging is usually designed to protect the stability of the drug. Therefore, try to keep the drug in its original packaging when stored, and seal it well after each use. If it is vitamin C health care products or food supplements, some use aluminum foil packaging, this packaging can be a good isolation of air and moisture, help to preserve vitamin C.
5. Contact with other substances
Vitamin C should be avoided with oxidizing substances. For example, some strong oxidants such as potassium permanganate, if and vitamin C contact, will quickly occur REDOX reaction, so that vitamin C failure. At the same time, it is also necessary to avoid contact with alkaline substances, because vitamin C is more easily oxidized in an alkaline environment, such as in chemical experiments, when vitamin C solution encounters alkaline solutions such as sodium hydroxide, vitamin C will be quickly destroyed.