adenosine grade

there are three grades adenosine in market.

 1,  first  is common grade which is low assay and white powder apperance,of course also is very cheap, and its price is usd 20/kg.

2. second is usp grade which is high assay and white crystalling powder apperance, and its pirce is usd 40/kg.

3. third is bacterial test grade which is high assay and has test bacterial, and can be add in material or cosmetic safely, its price is usd 60/kg.