Waters HPLC column: A Concise Guide

HPLC stands for High Performance Liquid Chromatography. Based on absorbency levels, a mixture is separated in a lab through complicated chemical procedures. By absorbency, you get to understand the power of absorbing or soaking individual components. There are various types of chromatography, including Waters HPLC column, thin layer and paper chromatography.

 

To determine the concentration pattern in molecules in a respective solution, HPLC is used extensively by the scientists. In fact, in some cases it is also used to identify solutions. However, in this procedure, many solvents are used that are mainly known as HPLC solvents. In the mobile phase, the liquid is constantly run throughout the system and it also contains non-polar HPLC solvents. The moment the sample is inserted into the HPLC, the liquid is distributed throughout the column. In here, the column is mainly known by stationary phase.

 

The roost of liquid chomotography dates back to 1900 something when a Russian botanist Mikhail Tsvet started experimenting with plant pigments in chlorophyll. From there, he invented the term ‘chromotography’ and from then onwards, this term is used extensively worldwide.

 

GE HPLC column is distinguished from traditional ("low pressure") liquid chromatography because operational pressures are significantly higher (50—350 bar), while ordinary liquid chromatography typically relies on the force of gravity to pass the mobile phase through the column. Due to the small sample amount separated in analytical HPLC, typical column dimensions are 2.1—4.6 mm diameter, and 30—250 mm length. Also HPLC columns are made with smaller sorbent particles (2—50 micrometer in average particle size). This gives HPLC superior resolving power (the ability to distinguish between compounds) when separating mixtures, which makes it a popular chromatographic technique.

 

The schematic of an HPLC instrument typically includes a sampler, pumps, and a detector. The sampler brings the sample mixture into the mobile phase stream which carries it into the column. The pumps deliver the desired flow and composition of the mobile phase through the column. The detector generates a signal proportional to the amount of sample component emerging from the column, hence allowing for quantitative analysis of the sample components. A digital microprocessor and user software control the HPLC instrument and provide data analysis. Some models of mechanical pumps in a HPLC instrument can mix multiple solvents together in ratios changing in time, generating a composition gradient in the mobile phase. Various detectors are in common use, such as UV/Vis, photodiode array (PDA) or based on mass spectrometry. Most waters HPLC column instruments also have a column oven that allows for adjusting the temperature the separation is performed at. So, don’t delay further and try one as per your needs and requirements.

 

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