Item

Specification

1. Appearance:

White crystalline powder

2.  Assay:

99.5%Min

1. Melting  point:

199~201±0.5oC

1. Clarity of water solution:

Transpency, colorless, none suspended matters

5.  pH value of 1% aqueous solution:

5.0～7.0

1. Specific optical rotation:

【α】D20=-66±2º

1. IPV:

1515cm-1 1220cm-1 1050cm-1 ±(5～8) cm-1

1. Arsenic:

≤2 ppm

1. Hydroquinone:

≤10 ppm

1. Heavy metal:

≤10 ppm

1. Loss on drying:

≤0.5%

1. Ignition  residue:

≤0.5%

1. Pathogen

Bacteria:

≤300cfu/g

Fungus:

≤100cfu/g