Allantoin Premium

Item I

Industrial Grade

Daily chemical grade

Pharmaceutical grade

Properties

White crystalline powder, no odor and taste

Identification: IR

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Qualified

Qualified

Content (potentiometric titration), %

≥98.5

98.0~102.0

98.0~101.0

Melting point, ℃

≥223

≥225

≥225

Drying loss, %

≤0.2

≤0.15

≤0.1

Residue on ignition, %

≤0.1

≤0.1

≤0.1

pH vlue (0.5% aqueous solution, 25℃)

4.0~6.0

4.0~6.0

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Optical rotation (0.5% aqueous solution)

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-0.10°－＋0.10°

-0.10°－＋0.10°

Acidity and alkalinity

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Qualified

Reducing sustances

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Qualified

Qualified

Related substances (TLC)

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Qualified

Arsenic (As), %

≤0.0002

≤0.0002

≤0.0002

Lead (Pb), %

≤0.001

≤0.001

≤0.001

Solubility

1. Solubility increases significantly with the raising of temperature (25℃, 5.7g/L；40℃, 
   11g/L；75℃, 40g/L)
2. Poorly soluble in propylene glycol, ethyl alcohol and glycerin