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The negative control

The negative control

The negative control

The negative control

1

Results : Characteristic spot can be observed clearly , while the negative control did not show spot .

结果：斑点显色清晰，阴性对照无干扰。

3

Result : This identification was exclusive, the negative control had no a interference .

结果：薄层鉴别专属性强，阴性对照无干扰。

6

RESULTS The TLC spots were fairly clear and the negative control showed no interference .

薄层色谱法的斑点清晰，阴性对照无干扰。

8

What is the purpose of the negative control ?

做阴性对照的目的是什么？

9

You are supposed to do the negative control at the same time as when you are testing the product .

当你们测试产品时你们应该同时做阴性对照。

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