1.background information

Food safety is one of the most important things in life, the public has always attached great importance to food safety. However, food analysis and sample treatment has always been a major problem for inspection and customs institutions. Most of the food is high in sugar, soft and easy to be deformed by grinding, and brittle and easy to be ground after being frozen at low temperature.However, due to the large sample size, manual liquid nitrogen grinding is difficult to complete. The liquid nitrogen frozen grinding machine of Ruishenbao Analysis Technology (Shanghai) Co., Ltd. is provided to solve the problem of grinding of dumpling, Snickers, dried bean curd, etc according to the requirements of a customs technical center. 

2.Sample making equipment and tools

1). Grinding equipment

Cryogenic Mill with Closed Liquid Nitrogen (LN2) Auto-fill: LPM-01

2). Grinding jar

Matching 2.1L food-grade alloy grinding tank

3. sample preparation

Cut the sample into pieces with scissors (you can put it into a grinding tank), and it is filled into the frozen grinding tank. place the frozen grinding tank in the correct working position. Adjust the pressure head of the grinding tank to the correct position. Click the " Head on" button above the operation screen. With the head in place and the freeze grinding tank pressed, close the operating cover of the freeze mill grind workshop. Click on the parameter interface, And set the parameter as：Precooling for 20 minutes (Fully freezing abrasive tools and samples in advance can appropriately reduce the precooling time）, Cryogenic valve opening temperature is -110℃，the closing temperature is -120℃，grinding time is 1min，rotate speed is1300r/min.

Open the liquid nitrogen tank outlet valve, Click the device start button to start the device. When the equipment is finished, open the freeze grinder workshop, Click the press head close button on the operation screen to open the frozen grinding tank and take out the sample. Clean the frozen grinding tank, close the outlet valve of liquid nitrogen tank, close the outlet valve of air compressor, as well as the air compressor electromechanical source, and close the frozen grinding electromechanical source.

4. Conclusion

The Ruishenbao frozen grinder can be used in large volumes to process soft, temperature-sensitive samples with high fat content or brittle at low temperatures, Such as animals and plants or a full range of food solutions. It makes the experiment more convenient and fast, saves a lot of manpower and material resources, and has high application potential.