5 Classifications of HPLC Column

The HPLC column generally consists of a column tube, a pressure cap, a ferrule (seal ring), a sieve plate (filter), a joint, a screw, and the like. The column is a column tube with a stationary phase for separating the mixture. It is mostly made of metal or glass. It has the shape of a straight tube, a coil, a U-tube, etc., and is widely used in many fields.

HPLC column classification

There are various types of HPLC columns designed for different separation techniques, each optimized for a specific application. Here’s a breakdown of the main types of HPLC columns:

1. Reversed-phase liquid chromatography column

It is widely used in drug metabolism and kinetics, life sciences, medical health, bioanalytical testing, drug and stimulant testing, food safety analysis, environmental analysis, and various military and homeland security applications. It is also one of the most important separation and purification technologies.

2. Normal-phase liquid chromatography column

It is the earliest chromatographic mode. Until now, further purification through silica gel columns after synthesis is still an important part of the daily work of organic chemists. In theory, almost all organic compounds dissolved in n-hexane, ethyl acetate, or isopropanol can be analyzed by high-performance normal-phase liquid chromatography.

However, in practical applications, the application of high-efficiency normal-phase liquid chromatography is much less than that of reversed-phase chromatography. This is because n-hexane and ethyl acetate are not as popular as water, methanol, or acetonitrile. In addition, A-type silica normal-phase liquid chromatography gives customers inertial thinking: High-efficiency normal-phase liquid chromatography has a long equilibrium time.

3. Hydrophilic liquid chromatography column

It is a mode of operation between the normal phase and reversed-phase high-performance liquid chromatography. This model was first introduced from the sugar analysis application of the HPLC column. After that, some valuable applications have been found in Diol, silica gel, and hydrophilic polymer-bonded phases.

In recent years, high-performance hydrophilic liquid chromatography has become a popular mode of operation for chromatography, mainly because of the good retention of hydrophilic compounds and the application of high-performance hydrophilic liquid chromatography in LC-MS/MS.

4. High efficiency and strong cation exchange liquid chromatography column

Ion exchange liquid chromatography is one of the most common and useful chromatographic modes for biological separation. On the other hand, it is rarely used for small-molecule separation analysis.

5. Affinity HPLC Columns

Affinity chromatography utilizes specific biological interactions to separate compounds. The stationary phase is modified with a ligand or antibody that selectively binds to a target molecule, allowing separation based on the affinity of the analyte for the stationary phase. The Stationary Phase is ligands or antibodies that bind specific biomolecules. The mobile phase is typically a buffer solution that allows interaction with the stationary phase.

Affinity HPLC Columns are always used in the purification and isolation of biomolecules, such as proteins, antibodies, enzymes, or hormones. Used in biotechnology for applications like protein purification, enzyme activity analysis, and immunoassays.

HPLC Column Types

In general, depending on the nature of the sample, the LC method used, and the selection of different types of columns. That is, different types of columns represent different chromatographic methods.

The difference between different types of HPLC columns is the difference in column structure, column packing, and column size. Such as the NH2 HPLC Column, ODS C18 HPLC Column, C18 Alkaline HPLC Column, and C1 HPLC Column, which have different column packings.

HPLC columns are available in different sizes (length and inner diameter), sub-preparative, routine analytical, and micro. The hardware of different types of columns is also different (including joints, columns, etc.), as well as radial pressurized columns and jacketed heating columns.

The size of different liquid chromatography methods can be selected according to requirements, and the common analysis is 3 to 30 cm long, with an inner diameter of 4 to 8 mm. A column 20 cm long and 4.6 mm in inner diameter is commonly used. The preparation column has an inner diameter of 8 mm and a length of 25 cm. The microcolumn has an inner diameter of l to 3 mm and a length of 10 to 20 cm. The effect of different filler analyses may vary due to differences in the production process. The same type of filler produced by the same manufacturer may vary from batch to batch, and this difference may start from the substrate (surface area, impurities, special treatment), as well as bonded chemicals. Fillers produced by different manufacturers will also vary greatly depending on the patented technology (pretreatment, bonding process, filling technology). Due to differences, it can only be assumed that the columns of the same batch number have substantially the same properties.

Most column packing matrices use porous silica particles, usually spherical and amorphous, with different particle sizes, pore sizes, and surface areas. Porous polymer microparticles are also suitable for reversed-phase chromatography. The polymer column has a wide mobile phase range, and the mobile phase pH can range from 1 to 13. The silica matrix pH can only be between 2.5 and 7. The polymer column is better, but it is still dominated by silica-based columns. In principle, polymer columns can overcome some of the deficiencies of silica matrix columns, but a large number of experiments are needed to confirm the overall superiority of polymer matrix fillers.

Used in analytical chemistry, a high-performance liquid chromatography(HPLC) column is a column that can separate out components from the liquid sample. When liquid samples pass through the HPLC column, depending on how they interact with an adsorbent material packed inside the column, analytes elute at different times. For the highest pressure resistance, HPLC columns are usually constructed of stainless steel.

The Hawach HPLC column can not only meet our worldwide customers’ needs for fast HPLC separation, but also the traditional methods within the pharmaceutical, environmental, clinical, and food industries as well.

The particle platforms that make up the Hawach HPLC columns are monolithic silica, polymeric, monodisperse silica, ultra-pure silica, and zirconia. With the whole set of different products, you can always find the right ones for your application.

Hawach has a tradition of making innovative HPLC Columns with high column efficiency, excellent shape peaks, and low pressure for a longer lifetime. You can also find the Hawach HPLC column performing at the same level as Waters, Agilent, and GL Science.