| ≥1 piece |
alpha arbutin CAS 84380-01-8
Assay: 99% by HPLC
|
Item
|
Specification
|
Results
|
|
Appearance
|
White crystalline powder
|
White crystalline
|
|
Assay
|
99.0%Min
|
99.90%
|
|
Melting?? point
|
203-206degree
|
204.6-205.8
|
|
Clarity of water solution
|
Transpency, colorless, none suspended matters
|
Pass
|
|
pH value of 1% aqueous solution
|
5.0-7.0
|
6.05
|
|
Specific optical ratation
|
D 20 =+176~184degree
|
+179.5
|
|
Arsenic
|
2 ppm max
|
pass
|
|
hydroquinone
|
10 ppm max
|
pass
|
|
Heavy metal
|
10 ppm max
|
pass
|
|
Loss on drying
|
0.5% max
|
0.05%
|
|
Ignition?? residue
|
0.5% max
|
0.04%
|
|
Pathogen
|
Bacteria:300cfu/g max
Fungus:100cfu/g max
|
20
20
|
|
Conclusion
|
|
pass
|
MP : 203-207 degree