TESTS

SPECIFICATION

Description

White or almost white crystalline powder

Identification

Infrared absorption should conform

HPLC retention time should conform

Color and clarity of solution

Clear, not more intense than Y7

Sulphated Ash

Not more than 0.1%

Organic volatile impurities

Maximum0.1percent

Heavy metals

         ≤10ppm

Related substance

TLC

Maximum 0.5.percent

HPLC

guanine: Maximum 0.7percent

single impurity : Maximum 0.5percent

Total impurities :Maximum 1.0.percent

Water

Maximum6.0percent

Assay

(Anhydrous basis)

98.5-101.0%