Analysis of the installation of chromatographic column and the method to prevent the injection needle from bending

Analysis of the installation of chromatographic column and the method to prevent the injection needle from bending

Chromatography column installation method and how to prevent the injection needle from bending

1. The column must be installed and removed at room temperature. The identification speed is fast (1 hour), which is very important for rescuing poisoned patients and providing doctors with treatment plans in a timely manner

2 Quality control of drugs and impurity inspection The purity of drugs is usually determined by physical constants such as melting point and absorbance value. )
For example, the remaining lipids in the column can be used with non-aqueous solvents such as methanol, acetonitrile, and tetrahydrofuran.

3. Place the valve in the "inject" position, and the mobile phase elutes the sample through the desorption cell for injection.
(2) Mobile phase:
The various organic solvents used in the mobile phase should be chromatographically pure as much as possible. The water used for the mobile phase is preferably ultrapure water or double-distilled water from all glassware.
For a typical silica gel bonding column, if there is no buffer solution, it is recommended to use the following solvent series: Dongao Accounting Net School
100% methanol
100% acetochlor
75% ethazene-25% isopropyl alcohol
100% isopropyl alcohol
100% dichloromethane
After using 100% n-hexane with methylene chloride or n-hexane, the column must be rinsed with isopropanol due to solvent compatibility before using the original aqueous solvent. Biological fluids containing protein substances can also be adsorbed on the filling surface.

(3) HPLC analysis
1. Insert the spme needle into the spme / hplc interface desorption cell, and place the injection valve in the "load" position.
nka-ii Polar reddish brown opaque spherical particles 160 ~ 200 145 ~ 155 Phenols and organics are removed.

d190 Macroporous styrene-sh (b) ≥0.7 (hg ++) Dedicated for mercury removal (apparent density 1.03,
The sulfur content of mercapto resin is 14%, and the elution rate is 100%). When the analyzed sample is a solid sample dissolved in a solvent, the syringe should be washed with the solvent in time after injection.

How to prevent the injection needle from bending

Many novices doing chromatographic analysis work often bend the needle and syringe rod of the syringe for the following reasons:

1. The inlet is tightened too tightly, and it is tightened too tightly at room temperature. When the temperature of the vaporization chamber rises, the silicone seal will expand more tightly. At this time, it is difficult to pierce the syringe.
h107 Non-polar black shiny spherical particles 1000 ~ 1300-medical, sleeping blood poisoning blood perfusion, removal of organic matter, etc.

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