Improvement test of Kjeldahl apparatus
In biochemical laboratories, the quantitative determination and analysis of proteins is a very important content. There are many kinds of protein content in an item, among which the Kjeldahl method is the most classic and commonly used method. The Kjeldahl method has the advantages of convenient determination of protein content, less material required, high accuracy of measurement results, and stable and reliable data. .
Nowadays, with the development of science and technology, the methods of protein measurement have become more numerous, the measuring instruments have become more accurate, and the operation has become more convenient. Among them, the instruments represented by automatic nitrogen determination instruments and fully automatic nitrogen determination instruments are among the best. Today we mainly make some improvements to Kjeldahl, making measurement more accurate and convenient.
The Kjeldahl method has been improved several times since its inception. It is divided into constant Kjeldahl nitrogen and trace Kjeldahl nitrogen. The distiller has decentralized and improved types. The latter has stereoscopic and planar types. . Now widely used is 1767 a three-dimensional modified Kjeldahl after many improvements, the structure, operability and accuracy of the nitrogen improver are greatly improved, but there are still many deficiencies.
If the decanter is too short, the pressure is not easy to control. When boiling, the sample mixture can easily rush out of the distillation bottle and enter the receiving bottle; the receiving liquid in the receiving bottle can be easily poured into the distillation bottle, which requires high stability to the heat source.
For this purpose, on the basis of multiple experiments and analyses, the 176-liter modified Kjeldahl was further modified as follows:
1, the height of the entire instrument increased from the original 35omm to 450mm. The newly added height 100mm is distributed according to the proportion of the original parts
2. Add an expansion zone C and E to the middle and upper parts of the distillation flask to act as a buffer. An expansion D is added to the corresponding part of the gas cylinder. The bottom of the original distillation bottle and the gas cylinder is also slightly enlarged. C and D are equal to B and A, respectively. E is slightly less than D.
3. Add a cavity F to the lower part of the condensing bottle G to accommodate the inhaled receiving liquid and prevent the receiving liquid from entering the distillation flask.
The improved nitrogen analyzer has been successfully tested. The actual operation proved that the further improved distiller has the advantages of good thermal stability, easy control of pressure and resistance to bumping. In the 50 samples of the test, only one case of bumping occurred, the success rate of up to 98%.
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