Determination of harmful substances such as pesticide residues in food

Harmful substances that may appear in food include plant toxins, animal toxins, microbial toxins, and chemical pollutants
.

The main sources of these harmful substances are: residues caused by improper use of pesticides and veterinary drugs; the production of harmful substances during food processing such as smoking, frying, baking, and pickling; illegal additions and illegal mixing during food processing Dissolution of harmful substances when unqualified food containers, packaging materials, transportation tools, etc.

The detection of hazardous substances in food is an important part of food testing
.

This project mainly introduces the detection methods of common pesticide residues, veterinary drug residues, mycotoxins and illegal additives in children

Determination of pesticide residues in food

1.
Pesticide residues and their sources

Pesticides refer to the general term for various drugs used to prevent and control crop plant diseases and insect pests, weeds and other harmful organisms, and to purposefully regulate the growth of plants
.

At present, there are thousands of pesticides in use all over the world, most of which are chemically synthesized pesticides

Pesticide residues are the general term for all derivatives of pesticides that remain in organisms, agricultural products, and the environment due to the application of pesticides, as well as impurities with toxicological significance, metabolic transformation products, and so on
.

Maximum Residue Limit (MRL) refers to the maximum concentration of pesticides legally permitted inside or on food or agricultural products, expressed in terms of the mass of pesticide residues per kilogram of food or agricultural products (mg/kg)

The main sources of pesticide residues in food are: ① Unreasonable or irregular application of pesticides directly contaminates crops or food
.

②Indirect contamination of food by pesticides

2.
The harm of pesticide residues

The problem of pesticide residues is one of the main problems in food safety
.

The main hazards caused by pesticide residues are as follows: First, it endangers health

Pesticide residues are an issue that countries all over the world attach great importance to, and the limits of pesticide residues are increasingly strict
.

The "GB2763-2012 National Food Safety Standard Maximum Residue Limits for Pesticides in Foods" jointly issued by the Ministry of Agriculture and the Ministry of Health of China was officially implemented on March 1, 2013