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HPLC chromatography

HPLC chromatography

High Performance Liquid Chromatography (HPLC)
is a form of column chromatography that pumps a sample mixture or analyte in a solvent (known
as the
mobile phase) at high pressure through a column with chromatographic packing material (stationary
phase). The sample is carried by a moving carrier gas stream of helium or nitrogen.
HPLC has the ability to separate, and identify compounds that are present in any sample that
can be dissolved in a liquid in trace concentrations as low as parts per trillion. Because of this
versatility, HPLC is used in a variety of industrial and scientific applications, such
as pharmaceutical, environmental, forensics, and chemicals.
Sample retention time will vary depending on the interaction between the stationary
phase, the molecules being analyzed, and
the solvent, or solvents used. As the sample passes through the column it interacts between
the two phases at different rate, primarily due to different polarities in the analytes.
Analytes that have the least amount of interaction with the stationary phase or the most amount
of interaction with the mobile phase will exit the column faster.
Main components in an HPLC system include the solvent reservoir, or multiple reservoirs,
a high-pressure pump, a column, injector system and the detector.
The reservoir holds the solvent, which is referred to as the mobile phase because it
moves. There are usually a minimum of two reservoirs in a system, with each holding
up to 1000 cc of solvent and usually fitted with a gas diffuser through which helium can
be bubbled. A pump is used to generate a specified flow of the mobile phase. Although manual
injection of samples is still possible, most HPLCs are now fully automated and controlled
by computer. The injector, or auto sampler, introduces the solvent into a phase stream
that carries the sample into the high pressure (up to 400 bar) column, which contains specific
packing material needed to effect separation. The packing material is referred to as the
stationary phase because it is held in place by the column hardware. A detector is needed to see the separated
compound bands as they elute from the high pressure column. The information is sent from
the detector to a computer which generates the chromatogram. The mobile phase exits the
detector and is either sent to a waste, or collected, as desired.
Helium sparging is an effective method of degassing the mobile phase to avoid unstable
baselines caused by dissolved air. Nitrogen is used as a nebulisation gas in Evaporative
Light Scattering Detector (ELSD) where the solvent is evaporated from
the sample leaving a mist as is measured. High-Performance Liquid Chromatography – Other
HPLC Types Ultra High Performance Liquid Chromatography
(uHPLC): Where standard HPLC typically uses column
particles with sizes from 3 to 5�m and pressures of around 400 bar, uHPLC use specially designed
columns with particles down to 1.7�m in size, at pressures in excess of 1000 bar.
The main advantage of an uHPLC is speed. These systems are faster, more sensitive, and rely
on smaller volumes of
organic solvents than standard HPLC, resulting in the ability to run more samples in less
time. However, if the systems are run at typical pressures greater than 800 bar, the columns
age, or degrade quicker. Newer technology is being developed for uHPLC units to use
column particles with 1�m size, and pressure potentials up to 6,800 bar. uHPLC is also known as UPLCTM, a trademark
of the Waters Corporation. Fast protein liquid chromatography (FPLC):
FPLC is a system similar to high-performance liquid
chromatography that
is used to separate or purify proteins and other
biomolecules from complex mixtures. The main difference between FPLC and HPLC is the
standard working pressure. FPLC columns can
only be
used up
to maximal pressures of 3-5 MPa. If the
pressure of the HPLC can be limited, nearly
every FPLC column may also be used in an HPLC system.

100 thoughts on “HPLC chromatography

  1. Hi. Do you have any idea about USP L37&L38 phase know as polymethycrylate type phase, which is work 100% water mobile phase, which solvent the packers pack the column.

  2. Quick question: let's say you have a polar stationary phase and a polar mobile phase with a polar analyte. Instead of the stationary phase slowing the movement of the analyte due to polar affects, wouldn't the stationary phase speed the movement of the analyte by "pulling" it through the tube via polar affects? Thanks

  3. The best explaination on HPLC, ever. I have never heard of any explaination better than yours. I mean my professors dont teach us like that. Thank you, sir.

  4. Who the hell is hitting the Unlike button… Shame on you the Unlikers/ Im gonna invite Shomu to have a dinner with me😅👍

  5. please boy over confidence hona ki zrorat nh hai,,,,,,aram se lecture do,,,,,,kuch zyada efficiency maar raha hoo,,,control yourself

  6. Hello, thank you for this video! But I am confused as I have seen absorbance on Y-Axis , does the area correlation still works in this case?

  7. hello sir I am doing this hplc first time and I don't know how to do could you please share your email address I want to contact with you

  8. Great video👍
    U need to know that someone is using ur video idea and she is explaining in exact way like u are bt in hindi and she is also using same examples u are giving .
    I hope ur hard work not go in vain..

  9. Thank u very much sir
    I am studying biochemistry
    In exam time I don't like to read out the notes but simply watch ur videos and get good marks in exams sir

  10. Good explanation, it is in general, if yiu explain with a protein sample, it is very good to understand what chemicals we can use

  11. I'm a fan! The last time I went through any of these techniques was back in college and I appreciate the explanation. Thank you

  12. Nice one…But never seen liquid stationary phase yet…Can any one tell me the name of liquid stationary phase in Hplc ?

  13. Thank you for the all of your explanation videos..most of our university badgemates watch your videos to understand Biochemistry lessons.Thank you From SriLanka❤

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