Theaflavins
Theaflavins are orange-yellow or reddish-brown powder or crystalline substance with an astringent taste, soluble in ethanol and ethyl acetate, prone to oxidation and discoloration under alkaline conditions, and hygroscopic.
Structure
core structure
TF1
TF2a
TF2b
TF3
Specifications
| TF20 | TF30 | TF40 | |
|---|---|---|---|
| Assay | ≥20.0% | ≥20.0% | ≥20.0% |
| Item | Standard |
|---|---|
| Loss on drying | ≤6.0% |
| Residue on ignition | ≤5.0% |
| Caffeine | ≤2.0% |
| Lead | ≤2.0mg/kg |
| Arsenic | ≤2.0mg/kg |
| Total plate count | ≤1000 cfg/g |
| Molds and yeasts | ≤100 cfg/g |
| E. coli (1g) | negative |
Package
25kg/drum
Storage
Store in light-tight, airtight and dry condition