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newstime:2017-09-05 times:
Appearance |
White crystalline power |
|
Purity(HPLC) |
≥98.0% |
|
pH |
8.0~9.5 |
|
Clarity and color of solution |
Should be clear and colorless |
|
Water content |
≤26.0% |
|
UV Ratio |
A250/A260 |
0.40-0.52 |
UV Ratio |
A280/A260 |
1.85-2.20 |
Heavy metals |
≤10ppm |
|
Arsenic |
≤0.00015% |
|
Lead |
≤2ppm |
|
Colony Forming Units |
≤300CFU/g |
|
Assay(on dry basis) |
97.0%~102.0% |