The difference between spotting capillary and sealed melting point capillary

1. Production method
The production of spotting capillaries is generally made by tangentially connecting glass capillaries and pipettes. The production process mainly includes three steps: tip treatment, tube wall protection and filling. Among them, the treatment of the tube tip is the most important part, and its shape and size directly affect the quality and stability of the capillary tube.

The sealed melting point capillary tube is made by melting point welding method. Two glass capillary tubes are heated and thermally overlapped, and then bonded together at high temperature to form a closed structure capillary tube. This production method can ensure the sealing performance of the capillary tube, but its cost is also relatively high.
2. Structure
The structure of the spotting capillary is relatively simple and its wall is thin, making it suitable for analyzing a small number of samples. The sealed melting point capillary tube has a relatively complex structure and a thick wall, which requires multiple processes to ensure its sealing performance.
3. Purpose
Spotting capillaries are generally suitable for gas chromatography analysis and microanalysis, and can meet the requirements for extremely high sensitivity and separation effects of samples. The sealed melting point capillary is mainly used in liquid chromatography analysis and high-performance liquid chromatography analysis. Its advantage is that it can avoid the problems of sample volatilization and low solubility and improve the analysis effect.
To sum up, there are differences in production methods, structures and uses between spotting capillary tubes and sealed melting point capillary tubes. Scientists can select different types of capillaries according to analysis needs to achieve precise analysis and quantitative detection of samples.
By 向阳 翟


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