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White or pale white powder
(1)Wave length(nm) Max.Absorbace290nm aqueous solution.
(2)Dissolved in acetone,by addition of hydrochloric acid,the solution gradually turns from light yellow to dark purple.
(3)Dissolved in water,by addition of silver nitrate solution,yield white precipitation;separating the precipitation and which can be dissolved in nitric acid.
(4)By TLC method,the sample should show the same dominant color spot as the reference standard at the same position at 254nm.
Stir 1.0mg of powder with 300ml water by mechanical stirrer for 10 minutes,then wait for 30 minutes until the solution become completely clear.
pH value 3.0-5.0
Sample absorbance not more than that of reference substance at 570nm.
Content of acetylisovaleryl tylosin A is not less than 80 %
Loss on drying
Weight loss is not more than 4.0%
The potency of 1 milligram sample is not less than 800U of acetylisovaleryl tylosin on the dried basis.