ANNEX I

E 625 MAGNESIUM DIGLUTAMATE

Synonyms

Magnesium glutamate

Definition

Chemical name

Monomagnesium di-L-glutamate tetrahydrate

Einecs

242-413-0

Chemical formula

C10H16MgN2O8 · 4H2O

Molecular weight

388,62

Assay

Content not less than 95,0 % and not more than 105,0 % on the anhydrous basis

Description

Odourless, white or off-white crystals or powder

Identification

A.

Positive test for magnesium

B.

Positive test for glutamic acid by thin-layer chromatog-raphy

C.

Specific rotation [α]D20

Between 23,8o and 24,4o

(10 % solution (anhydrous basis) in 2N HCl, 200 mm tube)

D.

pH of a 10 % solution

Between 6,4 and 7,5

Purity

Water

Not more than 24 % (Karl Fischer)

Chloride

Not more than 0,2 %

Pyrrolidone carboxylic acid

Not more than 0,2 %

Lead

Not more than 2 mg/kg