Detection instruments "arrest" pesticide residue fruits and vegetables

On the 6th, the Guangdong Provincial Department of Agriculture notified the sampling results of pesticide residues in some of the province's agricultural products, which showed that the qualified rate of pesticide residues in the litchi sample was 100%, and pesticide residues and tea had detected excessive pesticide residues. So how are pesticide residues in fruits and vegetables detected? Now in the field of testing equipment, what other instruments are showing their talents, and what are the fruits and vegetables containing pesticide residues? Some experts have suggested that ozone can eliminate pesticide residues, and what kind of ozone-specific instruments are used?

Rapid Detection of Pesticide Residues

Pesticide residue refers to the general term for pesticide precursors, derivatives, metabolites, degradants, and impurities that remain in the environment, organisms, and food after the pesticide is used. The excessive pesticide residue caused by vegetables is mainly caused by organophosphorus pesticides and carbamate pesticides that are banned by some countries in vegetable production, such as methamidophos, omethoate, formazan, parathion and methyl parathion. Wait.

The agricultural and sideline products that exceed the long-term consumption of pesticide residues, although not causing acute poisoning, may cause chronic poisoning in humans and animals, leading to the occurrence of diseases and even affecting the next generation.

So what technology applications can detect pesticide residues? It is reported that the traditional GC/MS and other pesticide residue analysis technologies have high detection costs and long periods of time. This has brought a lot of inconvenience to food safety supervision agencies in the pre-production, mid-production, and post-production supervision of agricultural products. Therefore, it has also spawned a large number of Rapid pesticide residue detection techniques include chemical rapid test, immunoassay, enzyme inhibition, and bioassay.

The chemical rapid measurement method is mainly based on the redox reaction, the color change of the hydrolysate and the detection solution, and is used for rapid detection of organophosphorus pesticides, but has low sensitivity, limitations in use, and is susceptible to interference by reducing substances; the immunoassay method is mainly used. Refers to radioimmunoassay and enzyme immunoassay. The most commonly used enzyme-linked immunosorbent assay (ELISA) is based on the specific recognition and binding reactions of antigens and antibodies. For small molecular weight pesticides, artificial antigens need to be prepared in order to perform immunoassays.

In addition, the enzyme inhibition method is the most mature and widely used rapid pesticide detection technology, mainly based on the specific inhibition of acetylcholine by organic phosphorus and carbamate pesticides. The bioassay method, as its name implies, is the use of living organisms to respond sensitively to pesticide residues, such as feeding samples of house flies and observing mortality rates to determine the amount of pesticide residues. This method is simple in operation, but it is qualitatively rough, low in accuracy, and narrow in application to pesticides.

Pesticide Detection "Soldier" - Testing Instruments

Pesticide residue detection instruments vary in type, according to the function and detection efficiency can generally be divided into pesticide rapid test card, pesticide residue detector, high-speed large-capacity pesticide residue detector, food safety detection box, there are other similar chromatograph, spectrometer and other high-end instrument. It must be emphasized that there are also differences between the quality of different instruments.

The reference to the pesticide speed test card, which is detected in the form of a card, is a type of rapid detection. To a certain extent, it is not an instrument, so despite the fast results, the operation of the tester is not very demanding, and some relatively simple tests or methods are simple and fast. However, the results can only be analyzed toxic and non-toxic, there is no technical participation.



In addition, the Pesticide Residue Tester has a wide range of applications where the test results are more accurate. It can quickly detect organic phosphorus and urethane pesticide residues in vegetables, fruits, grains, tea, water and soil. With the advantages of high accuracy, ability to undertake large amount of detection, and multiple test samples at the same time, it is applicable to agricultural inspection centers, industrial and commercial departments, production bases, farmer's markets, and supermarkets at all levels. The high-speed and large-capacity pesticide residue detector is mainly used for detection performance and detection improvement. It can detect 96 samples at a time and is an upgraded version of the former.

The food safety detection box can be configured according to the detection target requirements. Generally, the pesticide residue fast test card, the nitrite fast test tube, the formaldehyde qualitative quick test box, the formaldehyde semi-quantitative test kit, the water injection meat test paper, and the vinegar can be selected. Rapid determination of the total acid test kits, vinegar free acid speed test paper, soy sauce, total acid and amino acid nitrogen test kits, etc. nearly 30 configurations. Others include tea treasures for measuring tea leaves alone, fluorescent whitening devices for measuring mushrooms, and high-precision instruments such as gas chromatographs and liquid chromatographs, ultraviolet spectrophotometers, and atomic absorption spectrophotometers. The test results are generally applicable to characterization of food safety incidents caused by pesticide residues.

The feasibility of ozone to pesticides remains to be discussed

In January of this year, Professor Zhao Jianzhuang of the Beijing Agricultural College's Capital Agricultural Products Safety Industry and Technology Research Institute laboratory used a self-developed pesticide residue rapid-measuring device to test and confirm rapeseed with insect eyes. The pesticide residue was as high as 66.8%. Therefore, whether there are insect eyes or insect-free eyes, fruits and vegetables can not avoid pesticide residues in order to remove insects, and how to remove pesticide residues before use, what instruments can be used to improve this problem? The "Qingdao Morning Post" on June 5 reported that ozone is the most effective and safest method for removing pesticides.

According to the report description, experts from the special Qingdao Food Safety Special Action Program sought to find a number of products that were sterilized using ozone technology. On June 5, after repeated trials and comparisons, combined with trials and verifications by consumers, the expert group finalized a high-tech "disinfector" narcotics washing machine that can most effectively remove pesticide residues.

There are also experts questioning that the data from the research laboratory is not sufficient to prove that the ozone equipment has been put into the public kitchen. This is actually no need for verification. The labs often use the most advanced instruments to prove the data in the most scientific way. If the ozone equipment enters the home, it is another situation. Then returning to the original topic, the key to the control of pesticide residues in fruits and vegetables lies in the source. Only supervision from the source, or the development of green pesticides, does not require much effort to develop follow-up machines.