1、 Technical principle of pesticide residue detector: deep integration of enzyme inhibition method and photoelectric colorimetric method

The pesticide residue detector uses enzyme inhibition rate colorimetric method as its core, which detects the inhibitory effect of organophosphorus and carbamate pesticides on bile esterase activity, achieving accurate quantification of residue levels. The technical process is as follows:

1. Enzyme catalyzed reaction: Bile A esterase catalyzes the hydrolysis of acetyl bile A base, producing bile A base and acetic acid, while reacting with a chromogenic reagent to produce a yellow substance.

2. Pesticide inhibitory effect: If organic phosphorus or amino ester pesticides are present in the sample, they will inhibit enzyme activity, leading to weakened or absent color reactions.

3. Photoelectric colorimetric analysis: The instrument measures the absorbance change at a wavelength of 410nm and calculates the inhibition rate (formula: inhibition rate=(Δ A ₀ - Δ A ₜ)/Δ A ₀ × 100%). The inhibition rate is positively correlated with pesticide concentration.

　　2、 The functional characteristics of pesticide residue detectors: triple breakthroughs in efficiency, accuracy, and intelligence

1. High throughput detection

Multi channel design: For example, a 12 channel instrument can perform cyclic detection and screen 100 vegetable samples within 2 hours, suitable for sampling in large-scale agricultural markets.

Quick results: The single sample testing time has been shortened to 3-5 minutes, meeting the real-time screening needs on site.

2. Intelligent operation

Automated process: Equipped with a 7-10 inch touch screen and built-in GB 2763 national standard method, it automatically completes the entire process of incubation, color development, reading, and data analysis.

Data cloud synchronization: supports remote control and USB drive export, and regulatory personnel can view the detection progress in real time through a mobile app, achieving "unmanned" detection.

3. Portable design

Lightweight body: weighing only 2-5kg, equipped with a rechargeable lithium battery, with a range of over 8 hours, supporting car power supply, suitable for outdoor scenes such as greenhouses and orchards.

Integrated structure: integrating sample processing, liquid addition, and stirring modules to reduce manual operation errors.

4. Full residual coverage

Multi class pesticide testing: capable of simultaneously analyzing over 200 pesticide residues, including organophosphates, carbamate, and pyrethroids.

Multi substrate adaptation: supports sample testing of vegetables, fruits, tea, grains, meat, and other products to meet the needs of the entire industry chain.

　3、 The full scenario application of pesticide residue detector: food safety defense line from the field to the dining table

1. Agricultural production process

Planting base: Detect pesticide residues 3 days before harvesting to ensure compliance with harvesting standards. For example, vegetable growers use portable instruments to detect imidacloprid residues and guide scientific medication.

Farm: Regularly detect veterinary drug residues in feed and urine to avoid antibiotic abuse. For example, pig farms ensure pork safety by detecting clenbuterol (clenbuterol) residues.

2. Acquisition and processing stages

Grain purchasing station: Use multi-channel instruments to screen for organic phosphorus pesticide residues in wheat and corn in batches, and prevent excessive grain from entering the processing stage.

Juice factory: During raw material inspection, detect residues of Penicillin A in fruits to ensure the safety of concentrated juice. After a large canning enterprise introduced a fully automated inspection line, the raw material qualification rate increased by 30% and the production efficiency increased by 40%.

3. Market supervision and enforcement of laws

Agricultural market: Personnel used colloidal gold test strips or portable instruments to detect 32 batches of chives containing banned and restricted pesticides within a week, effectively curbing the spread of risks.

School cafeteria: Conduct safety speed testing before fruit and vegetable processing to provide additional assurance for the food safety of teachers and students.

4. Import and export inspection and quarantine

Customs laboratory: Conduct comprehensive screening of hundreds of agricultural and veterinary drug residues in imported and exported meat and aquatic products using LC-MS/MS.

　4、 Precautions for using pesticide residue detectors

1. Rapid operation is required during sample processing to avoid prolonged exposure of the extraction solution to air, which may affect the stability of pesticide residues.

2. When using the pipette, it is necessary to replace the dedicated suction head. Different samples and reagents should not be used interchangeably to prevent contamination.

If there are abnormal absorbance or instrument errors during the testing process, it is necessary to first check the effectiveness of the reagents, the cleanliness of the colorimetric cell, and other issues before retesting.

4. The test results are only for rapid screening, and the final judgment should be based on the national standard confirmation method, and cannot be directly used as a basis.

　　5、 Conclusion: Empowered by technology, safeguarding the safety of the tongue

The pesticide residue detector takes high flux, high precision, and intelligence as its core, and constructs a full chain prevention and control system from the field to the dining table through technological iteration and scene adaptation. It not only improves detection efficiency and accuracy, but also promotes the transformation of food safety governance from "post disposal" to "pre prevention". With the popularization of miniaturization and green technology, this instrument will become a "technological weapon" in grassroots supervision, agricultural production, and international trade, safeguarding everyone's health.