What are the common pretreatment methods before food drying?

Because food itself contains protein, fat, sugar and so on. , interfere with the analysis and determination, before the analysis and determination, the sample should be treated to remove the interfering substances and concentrate the tested substances. Sample treatment should be based on the physical and chemical properties of the tested object and the characteristics of the sample. For example, dehydrated vegetables are a kind of processed food that is very popular with consumers in recent years because they are easy to carry after purchase.

The following methods are commonly used:

1, organic matter destruction method ① dry ashing to avoid the loss of tested substances, adding alkali or acid ② wet digestion.

2. Distillation method ① Atmospheric distillation ② Vacuum distillation ③ Steam distillation ④ Fractionation ⑤ Sweep distillation method.

3. Solvent extraction, solvent layering, soaking, salting out, sulfonation and chromatographic separation.