1、 Product Principles
According to the insect toxicology principle that organophosphorus and carbamate pesticides can inhibit the activity of Acetylcholine enzyme in the central and Peripheral nervous system of insects, cause the accumulation of nerve conduction medium Acetylcholine, affect normal transmission, and make insects poisoned to death, it is used in the detection of pesticide residues. If the vegetable extract does not contain organophosphorus or carbamate pesticides or the residue is low, the enzyme activity will not be inhibited, the substrate added in the test will be hydrolyzed by Enzymatic hydrolysis, and the hydrolysate will react with the added developer to produce color. On the contrary, if the vegetable extract contains a certain amount of organic phosphorus or carbamate pesticide enzyme activity will be inhibited or partially inhibited, the substrate added in the test will not be hydrolyzed by Enzymatic hydrolysis or a small part will be hydrolyzed, so there will be no color development or little color change. Use a spectrophotometer to measure the change of absorbance value with time to calculate the inhibition rate, Then we can judge whether there are organophosphorus or carbamate pesticide residues in vegetables.
2、 Test items
For rapid detection of organophosphorus and carbamate pesticide residues in vegetables.
3、 Performance characteristics
1. According to standards: it can be tested according to both the national standard GB/T5009.199-2003 and the industry standard NY/T448-2001;
2. The color LCD 7-inch touch screen display can display various data, measurement results, and other operation prompts during the measurement process in real-time, achieving good human-machine communication;
3. Acetylcholine and butyrylcholinesterase Universal design, corresponding enzyme reagents can be selected for detection in the setting;
4. Large capacity memory, which can store more than 15000 pieces of data, and can query any group of original data stored according to time or serial number;
5. Equipped with an embedded thermal printer to quickly and automatically print detection results;
6. Original imported long life non thermal solid-state light source with high accuracy, stable performance, controllable light source, greatly extending service life;
7. Intelligent judgment of whether there is a sample placed in the channel, and the detection result is produced within three minutes;
8. The unique enzyme reagent activity determination function automatically determines whether the reagent is effective and automatically alarms if it fails;
9. Double column cassette design, easy to operate, capable of simultaneously measuring 12 samples;
10. Unique patented technology: sample detection upon release, ensuring enzyme activity is activated at the optimal time and improving the accuracy of results.
4、 Technical parameters
1. Light source wavelength: 410 ± 2nm
2. Wavelength repeatability: ± 1.5nm
3. Transmission accuracy: ± 0.3% T
4. Transmission specific gravity reproducibility: ± 0.5% T
5. Measurement range of inhibition rate: 0-100%
6. Pesticide detection line: 0.1-5mg/kg
7. Wavelength accuracy: ± 2nm
8. Light metering method:% τ)、 a. R%
9. Photometric range: 0% τ～ 200% τ (-0.301a to 3.000a)
10. Operating environment: Temperature: 5 ℃~45 ℃; Humidity: ≤ 85%
11. Power supply voltage: AC 200-240V, 50Hz
