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Sample pretreatment for food testing

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Sample pretreatment for food testing

Date of release:2020-09-03 Author: Click:

If the detection of food, in fact, it is very complex, because food contains a lot of elements, including protein, sugar, fat and vitamins and so on. It also contains inorganic elements such as potassium, calcium, iron and so on. And these components are interlaced in a more complex way. Therefore, we need to detect a lot of ingredients when testing food.

Sample pretreatment

When a certain method is used to determine the content of one component, the existence of other components often brings interference to the determination. In order to ensure the smooth progress of the analysis and obtain accurate analysis results, the force between the components in the sample must be destroyed before the determination, so that the tested component can be free, and the interference component can be eliminated. Therefore, sample pretreatment is required. In addition, some trace components, such as pollutants and pesticide residues, are difficult to detect due to their small content. In order to accurately determine their content, the samples must be enriched or concentrated before determination.

Effect of sample pretreatment

Purpose of sample pretreatment

1. Separate the components to be tested from the complex samples and make them into the solution form which is convenient for determination.

2. Remove the matrix materials that interfere with the analysis and determination.

3. If the concentration of the tested component is low, it needs to be concentrated.

4. If the tested component is difficult to be detected by the selected analytical method, it is also necessary to quantitatively convert it into another compound which is easy to detect by sample derivatization.

Requirements for sample pretreatment

1. Whether the sample should be pretreated, how to do the pretreatment, and what kind of sampling method should be considered according to the characteristics of the sample, the inspection requirements and the performance of the analytical instruments used.

2. Pretreatment should not be used or used less as far as possible, so as to reduce the operation steps, speed up the analysis speed, and reduce the adverse effects brought by the pretreatment process, such as the introduction of pollution, loss of substances to be measured, etc.

3. When the sample is treated by decomposition method, the decomposition must be complete, which can not cause the loss of the tested component, and the recovery rate of the component to be tested should be high enough.

4. The sample should not be contaminated, the components to be tested and the substances interfering with the determination should not be introduced.

5. The consumption of reagents should be reduced as much as possible. The method is simple, fast and less polluting to environment and personnel.

Sample pretreatment requirements

In fact, sample pretreatment is to distinguish some small things. It is also an important environment in the process of food composition analysis, which is related to the final success or failure of inspection. Generally speaking, only a small number of food, no specific living cells, so the detection of trace elements, is not necessary to carry out pre-treatment, direct use of instrument detection can.

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Key word:Samplepretreatment,Effectofsamplepretreatment,Samplepretreatmentrequirements

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