Food safety has become the most concerned issue for people nowadays. Excessive use of pesticides in agricultural products has led some illegal vendors and food processing enterprises to bleach, fumigate, and dye food with toxic chemical raw materials for profit, resulting in excessive levels of sulfur dioxide, coloring agents, formaldehyde, sodium sulfite, and other substances in food, seriously damaging the health of consumers. Due to the long time and certain lag of traditional detection methods, rapid detection can be chosen as a screening method. The main safety issues currently present in food are:

1. Excessive pesticide residues in food

2. Adding industrial bleaching agents to food - such as white pellets and sulfur dioxide

3. Adding preservatives - formaldehyde - to food

4. Adding colorants - nitrite and nitrate - to food

Hengmei has launched a rapid pesticide residue detector that can comprehensively detect multiple varieties, including organic phosphorus and amino acid ester pesticide residues in vegetables, fruits, grains, tea, water, and soil.

Healthy fruits and vegetables need to be tested to know; Pay attention to physical health, starting with pesticide residues. Below, the editor will introduce how to use the pesticide residue detector:

Preparation stage:

[1] Prepare reagents, buffer solutions, etc. using pesticide residue reagents. Prepare the test samples and reagents. Supporting tools for testing

Note: Pesticide residue reagents are stored frozen before preparation, with a shelf life of 18 months (0-5% C refrigerated)

[2] Turn on the pesticide residue detector, perform self check and preheating to ensure that the instrument can be used normally.

Detection stage:

[1] Take 2g of fruit and vegetable samples, shake for about 1-2 minutes, and let them stand for 2 minutes. Add 10ml buffer and shake

[2] Extract 2.5ml of clear water, add 100ul of enzyme and 100ul of color developer separately, mix well, and let it stand for 10 minutes.

[3] Add 100ul of substrate, shake well and immediately pour into the colorimetric dish. Place it in the instrument channel in a timely manner, close the lid, press the "drug residue detection button", and select the channel to be detected,

Then start the detection. The instrument starts for 3 minutes, completes timing, displays absorbance and inhibition rate, and automatically prints the detection results.

Main parameters of pesticide residue detector:

1. Widely used for rapid detection of organophosphate and carbamate pesticide residues in foods such as vegetables, fruits, tea, grains, and agricultural products; In addition, it can also be used for on-site testing in fruit and vegetable tea production bases and agricultural wholesale sales markets, as well as safety speed testing before fruit and vegetable processing in restaurants, schools, canteens, and households.

2. Acetylcholinesterase and butyrylcholinesterase reagents can both be used, meeting the requirements of national standards and the standards of the Ministry of Agriculture.

3. Automatically determine whether the sample is qualified, making the test results more intuitive.

4. The instrument has a database of over 100 vegetable names, which can be directly accessed by clicking. And vegetable names can be edited and printed directly.

5. Detection channels: 8 detection channels, capable of testing multiple samples simultaneously. Each sample is controlled by a program to work independently without interfering with each other.

6. The main control chip adopts a 32-bit processor, which runs faster and has strong stability.

7. Display mode: 5-inch LCD touch screen display, user-friendly Chinese operation interface, intuitive and simple reading.

8. The printer uses a 5V serial port for printing, and can choose to print manually or automatically. The printing result takes three minutes and the printing format includes the name of the tester, absorbance difference, testing time, testing institution, sample name, and result judgment.

9. The light source adopts imported ultra high brightness light-emitting diodes, which have the advantages of low power consumption, high precision, strong stability, controllable light source that can turn off unused light sources, and fast response speed.

10. Designed with USB 2.0 interface, it is convenient for data storage and movement, and can be directly connected to a computer at any time. The instrument can also be controlled by a computer. Implement data query, browsing, analysis, statistics, printing, etc.

11. High degree of intelligence, the instrument has self checking function: it has power on self checking and zero adjustment functions, and has automatic detection of repeatability function

The instrument has its own protection function, which can set a username and password to prevent non staff operations.

12. Adopting DC12V DC power supply, the safety system is higher and equipped with a 2A lithium battery charger.

13. The instrument has the functions of recalibration, locking, and factory reset.

14. Technical parameters;

Pesticide residue detector * wavelength configuration: 410nm;

*Inhibition rate display range: 0% to 100%;

*Inhibition rate measurement range: 0% to 100%;

*Transmittance accuracy: ± 1.5%;

*Transmission density repeatability: ≤ 0.5%;

*Drift: ≤ 0.00bs/3min;

*Inhibition rate indication error: ≤ 10%

*Inhibition rate repeatability: ≤ 5%

15. Optional features

1) Data can be wirelessly transmitted to mobile phones or networks through the GPRS module.

2) 5-inch touch screen or 7-inch touch screen, the instrument defaults to a 5-inch screen.

3) The instrument can achieve self heating function.

4) Large capacity lithium batteries can be configured.