How do I store the dopamine hydrochloride laboratory?

I bought powder, brown bottles, and did not indicate special storage conditions. It should be the room temperature. The dopamine hydrochloride solution is indeed easy to degrade. Powder should be good

Dopamine molecules contain two phenol hydroxyl groups, which means that it is easy to oxidize into a pupa, and its nature is similar to that of cateol (phthalamine), which is more likely to be oxidized by the oxygen in the air than phenol.After dopamine and hydrochloric acid are salted, mass amin amino (ammonium salt) is relatively stable. It is not easy to be oxidized by oxygen, nor can it absorb CO2 in the air like the free amine (or alkali-dopamine).But just mentioned, the strong reduction of the phenol hydroxyl group, so be sure to seal and save (prevent O2's oxidation), and be sure to avoid light (the ultraviolet rays can catalyze the oxidation of accelerated phenol hydroxyl), brown bottle, it is best to set it outside again.A black plastic bag is recommended to save it in a refrigerator of 2-8 ° C (although it is stable at room temperature, it is estimated that the intention of refrigerating is to slow the rate of oxidation).

Hello, how did you save and use it later?Thank you