|
ITEM
|
STANDARD
|
|
Appearance
|
White or pale-white crystalline powder
|
|
Identification
|
The retention time of the major peak of the sample solution corresponds to that of the standard solution.
|
|
Heavy metal
|
10ppm Max
|
|
Loss on drying
|
0.5% Max
|
|
Residue on ignition
|
0.1% Max
|
|
PH
|
5.0-7.0
|
|
Melting range
|
203~206℃
|
|
Specific optical rotation
|
(α)D20 =+176~184º
|
|
Hydroquinone
|
≤10 ppm
|
|
Total Plate Count
|
<1000 cfu/g
|
|
Yeasts & Molds
|
<100 cfu/g
|
|
E.Coli
|
Negative
|
|
Salmonella
|
Negative
|
|
Assay(HPLC)
|
≥99.0%
|