China is a large agricultural country. The invention and use of pesticides have greatly increased the output of foodstuffs. Organophosphorus pesticides are the most used pesticides in China at the current stage and have promoted the development of agriculture. However, due to excessive and improper use, the agricultural environment and food safety problems caused by pesticide residues and their pollutants are getting more and more attention. Therefore, the detection of organophosphorus pesticide residues has become a very important task. One of the most effective ways to control the hazards of pesticide residues on humans is to strengthen the detection of pesticide residues in foods.
With the continuous improvement of people's quality of life, health has gradually become the focus of attention. However, during the growth process, fruits and vegetables do not know how many pesticides have been used to kill insects. As a result, pesticides and other harmful substances are increasingly left on fruits, vegetables and other foods, seriously threatening people's health. When we unknowingly eat foods that contain residual pesticides and harmful substances, they cannot be discharged from the human body and they are trapped in the human body, directly endangering human health, causing necrosis, hardening of the internal organs, weakening of immune function, and poor development. The Portable Pesticide Residue Tester can help you identify whether there are pesticide residues in fruits and vegetables in a few minutes so that you and your family and others can enjoy it with peace of mind.
However, the initial pesticide residue detection technology was limited to chemical, colorimetric and bioassay methods. The detection method lacks specificity and the sensitivity is not high. In the 1960s, gas chromatography was applied to the analysis of pesticides and drug residues, which greatly improved the detection level of pesticides and drug residues. Since the 1980s, high performance liquid chromatography has begun to be widely used for the analysis of heat-labile and ionic pesticides and their metabolites. Although the chromatographic method is accurate and highly sensitive, the equipment required is expensive, requires professional operation, and has a long analysis time, which is not conducive to on-site monitoring.
In recent years, the application of electrochemical biosensors to the monitoring of pesticide residues has attracted widespread attention. Compared with traditional HPLC, gas chromatography and other laboratory testing methods, electrochemical biosensors have the advantages of rapid detection and easy operation. , Low cost, high sensitivity, etc.; and after the miniaturization of the modified biosensor production of pesticide residue detector is easy to carry, convenient for field testing in the outdoors.
After the pesticide residue detector has been designed, it can detect that organic phosphorus and carbamate pesticides can inhibit the normal function of cholinesterase under certain conditions, and the inhibition rate is in a positive relationship with the concentration of pesticides. Under normal conditions, the enzyme catalyzes the hydrolysis of the metabolite (acetylcholine), a neurotransmitter, and the hydrolysate reacts with the chromogenic reagent to produce a yellow substance. The pesticide absorbance tester measures the change in absorbance over time and calculates the inhibition rate. The inhibition rate can be judged. Whether the sample contains organic phosphorus or carbamate pesticides.
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