（4） Drug residue detection

1. The initial screening method is designed for speed and convenience, and is a positive or negative test method for a certain concentration of a drug in a certain matrix. Traditionally, microbial inhibition tests have been used for antibiotic preliminary screening of large batches of samples, and are still widely used today. In addition, new rapid detection kits based on radioimmunoassay and enzyme immunity are also being used for initial screening of designated drugs. However, these initial screening tests are not always accurately equal to or below the detection threshold, and can usually only be classified and cannot be confirmed as a specific compound, which can or cannot be used for quantification. Therefore, if there are indeed illegal residual drugs in the sample, it is necessary to use another analytical test method to detect and determine

2. The purpose of detection methods is to perform separation and quantitative analysis, and may provide some qualitative data that is meaningful for analysis. Most GG and LC methods fall within this category

3. The confirmation method is to provide clear identification for residual drugs in question. Due to its sensitivity and specificity, mass spectrometry is the first confirmed method, and there have been discussions on establishing a guide for mass spectrometry data of positive test products

To avoid confusion in naming, the three method types mentioned above are also known as "primary method", "secondary method", and "tertiary method". The "tertiary method" named in this way also provides preliminary information on the existence of a compound; The 'secondary method' is used to determine concentration. Perhaps some structural information can also be provided; The "first level method" is both quantitative and qualitative confirmation

Function of testing report:

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6. Industrial problem diagnosis: Verify the troubleshooting and correction of industrial production problems

BAIJIAN testing process:

1. Telephone communication and confirmation of requirements

2. Recommend solutions and confirm quotations

3. Mail samples and arrange testing

4. Progress tracking and result feedback

5. Provide reports and after-sales service

6. If urgent or priority processing is required

Our Competitive Edge:

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7. Possess authoritative qualifications such as CMA, CNAS, CAL, etc

8. The testing report is authoritative and effective, and is generally used in China