Appearance

White crystal or crystalline powder,no odor

The product is soluble in water and methanol, slightly soluble in ethaol, insoluble in chloroform or ether

White crystalline powder,no odor

Complies

Melting point

220~225℃

220.6~224.2℃

Specific absorption

1%

（E1cm）778~818

791

Indentification

(1) Should be positive

(2) The infrared absorption spectrum should be consistent with the reference map

(3) Should be positive

Positive

Complies

Positive

Relative substance

Calculated by the external standard method based on the peak area, dicyandiamide should not exceed 0.02%, the peak area of other single magazines should not be greater than 0.2 times (0.1%) of the main peak area in the control solution, and the sum of the peak areas of other impurities should not be greater than the main peak area of the control solution (0.5%).

Complies

Moisture, %

≤0.5

0.1

Residue on ignition

≤0.1

0.04

Heavy metals,%

≤0.002

Complies

Assay

≥98.5%

99.43%

Total aerobic bacteria，cfu/g

≤1000

Complies

Coli Group, cfu/g

≤30

Complies

Yeast&Mold,cfu/g

≤100

Complies

E. Coli

Negative

Complies