I have read a lot about sample digestion methods in food testing on the Internet. Combined with daily work, I will summarize some of them now. Hope can get more advice and enlightenment.
Digestion methods and comparison of commonly used samples for element detection in the food industry:
Commonly used are microwave digestion, high-pressure digestion, and electric hot plate wet heating (so-called low-pressure digestion), etc.
First of all, the microwave digestion method is currently more trusted and widely used, but this type of digestion method is widely used in scientific research institutions. For example, food and drug inspection institutes, quality supervision bureaus, entry-exit, provincial and municipal CDCs and other institutions, as well as authoritative third-party testing units, such as: SGS, etc., are more widely used. The most common microwave digestion instruments are imported American CEM, Milstone, Anton Paar, Jena, Beifen Rayleigh and other well-known manufacturers. It is understood that the current research institutes use more microwave digestion instruments from Paian in the United States.
It has many advantages, such as convenient use, accurate and convenient sample detection data, batch operation and high authority. At the same time, its use cost is higher than other processing methods, and it has high requirements for users. It is sometimes difficult to meet the special and harsh requirements of individual elements, such as the digestion and detection of heavy metal lead in food, drug and dairy products. Lead needs to be simultaneously High temperature and high pressure, high temperature and high temperature cannot be used for microwave digestion, and high temperature cannot be used for high pressure. When digesting lead elements, it is difficult to completely digest them.
Secondly, the high-pressure digestion method was the most important national standard reference method before microwave digestion, with a wide range of applications and simple operation. The requirements for users are not very strict, and the batch processing sample volume is large, and at the same time high temperature and high pressure, especially for difficult-to-digest metal elements, especially lead, chromium and other elements, the effect is excellent. The cost is relatively more economical. At present, such methods are widely used in CDC and third-party testing, Food and Drug Administration, grain and oil inspection stations and other fields in 2013 and 2014. The data obtained from the experiment are also considerable and accurate.
Finally, the electric heating plate heating is the wet digestion method. For some simple and easy-to-digest sample digestion, the temperature requirement is not too high, and the pressure is not high, so it is easy to digest. The electric heating plate is directly matched with PTFE crucibles, beakers, test tubes, etc. Low cost, convenient and simple. At present, such methods are widely used in small enterprises or small units such as major pharmaceutical factories, dairy factories, and food factories. The utility model has the advantages of convenient use, low cost and simple operation. Disadvantages: low pressure, basically useless for insoluble and difficult to digest samples.
The above are some of the digestion methods summarized by the individual. No matter which digestion method is used, it has its own advantages and disadvantages.
Hope everyone give advice.