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L-氨基酸 >> L-胱氨酸

 

L-氨基酸 >> L-胱氨酸

 产品:L-胱氨酸

 
Product: L-Cystine base
 
Cas No.:56-89-3

 

Item

Limited

(Enterprise Standard)

Appearance

White crystalline powder or crystals

Specific  Rotation

-215~-225

State Of Solution

92%

Chloride

0.06%

Sulfate

0.02%

Iron

10ppm

Heavy Metals

10ppm

Arsenic

1.0ppm

Other Amino Acids

Chromatographically

Not Detectable

Loss On Drying

0.20%

Residue On Ignition

0.10%

Assay

98.5~101.0%

Ph

5.0~6.5

 

 Item

Limit (EP5)

Characters

A white, crystalline powder, practically insoluble in water and in alcohol. It dissolves in dilute solutions of alkali hydroxides

Identification

conforms

Specific optical rotation

-218 to -224

Ninhydrin-positive substances

Meets the requirements

Chloride

≤200ppm

Sulphate

≤300ppm

Ammonium

≤200ppm

Iron

≤10ppm

Heavy metals(as Pb)

≤10ppm

Loss on drying

≤0.50%

Sulphated ash

≤0.1%

Assay

98.5% ~ 101.0%

 

Item

Aji92

Appearance

White Crystals Or Crystalline Powder

SPECIFIC  ROTATION[Α]D20

-215° To -225°

State Of Solution

≥98%

Chloride

≤0. 02%

Sulfate

≤0. 02%

Iron

10ppm

Heavy Metals

≤10ppm

Arsenic

≤1.0ppm

Other Amino Acids

Chromatographically

Not Detectable

Loss On Drying

≤0.2%

Residue On Ignition

≤0.10%

Assay

98.5~101.5%

Ph

5.0~6.5