Detection of pesticide residues in traditional Chinese medicinal materials

Due to the wide variety of medicinal herbs, the basic composition of various medicinal herb samples is complex, and the predicted composition of various pesticides is different. There are also influences from homologous compounds, isomers, degradation products, metabolic products, etc. of pesticides. Heavy metals and other chemical pollutants that medicinal herbs come into contact with during production, transportation, and processing may also accumulate in their tissues, thereby increasing the difficulty of pesticide residue analysis in medicinal herbs.

Before pesticide residue determination, there should be a pre-treatment method suitable for traditional Chinese medicine, which converts the medicine into a sample solution that can be tested on the machine, generally including extraction, purification, concentration and other pre-treatment steps. According to the different types of pesticides tested, different pre-treatment techniques need to be used for medicinal samples.

Detection of pesticide residues in traditional Chinese medicinal materialsThrough testing, we can effectively promote the scientific and standardized development of production in the process of origin, place of origin, planting process, harvesting and place of origin processing, packaging and storage, gradually establish the quality control of the whole process of production, circulation and use of Chinese herbal medicines, Chinese herbal decoction pieces, traditional Chinese patent medicines and simple preparations, and gradually realize the source, destination, and responsibility of key varieties of Chinese herbal medicines can be traced, and promote the standardization, standardization, and large-scale development of the industry.

Detection of pesticide residues in traditional Chinese medicinal materialsThe pollution of traditional Chinese medicinal materials can generally be divided into: excessive pesticide residues, indirect environmental pollution, and pollution caused during harvesting, processing, storage, and transportation. If prohibited pesticides are used, excessive pesticide residues pose a greater threat to other types of pesticide pollution.

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1. Basic indicators: impurities, moisture, dryness, weight loss, ignition residue, ash content, extracts, tannins, volatile oils, properties, etc;

2. Pesticide residue testing: testing for 33 pesticide residues including hexachlorobenzene, hexachlorocyclohexane, heptachlorocyclohexane, pentachloronitrobenzene, chlordane oxide, cis epoxyheptachlorocyclohexane, etc;

3. Ingredient content: content determination and identification;

4. Characteristic testing: appearance characteristics, traditional Chinese medicine characteristics, etc;

5. Identification and detection: TLC identification, paper chromatography identification, gas chromatography identification, liquid chromatography identification, infrared spectrum identification, microscopic identification of Chinese medicinal materials, microscopic identification of traditional Chinese patent medicines and simple preparations

6. Microbial testing: bacteria, mold, yeast, Escherichia coli, Salmonella, Pseudomonas aeruginosa, bacterial endotoxins, sterility test, initial contamination bacteria, etc

7. Heavy metal detection: lead, chromium, mercury, arsenic, copper, etc

8. Fungal toxin detection: aflatoxin, etc;

9. Other indicators such as toxicology: abnormal toxicity, pyrogen test, hemolysis and coagulation test, allergic reaction, mycoplasma test, abnormal toxicity, heat source, allergy test, hemolysis test, etc;