How does an LC-MS work?

March 9, 2020 Off By idswater

How does an LC-MS work?

It is a powerful analytical technique that combines the resolving power of liquid chromatography with the detection specificity of mass spectrometry. Liquid chromatography (LC) separates the sample components and then introduces them to the mass spectrometer (MS). The MS creates and detects charged ions.

What does LC-MS MS tell you?

The LC-MS/MS is a powerful tool for the detection of residual chemical compounds, confirmatory identification of small organic molecules, and confirmation and quantitation of contaminants and adulterants in pharmaceutical and food samples—for example, vanilla.

How does a triple quad work?

A triple-quadrupole mass spectrometer, also known as QqQ, is a tandem MS method in which the first and third quadrupoles act as mass filters and the second causes fragmentation of the analyte through interaction with a collision gas—it is a radiofrequency-only quadrupole, and can be used in either SIM or scan mode.

What is an LC instrument?

Comprising two components, a liquid-phase separation system and a mass spectrometer, liquid chromatograph mass spectrometers (LC MS instruments) couple sample fractionation and analysis. The separation can be accomplished via standard liquid chromatography, HPLC, UPLC, or even nano-LC.

What is the difference between GC MS and GC MS MS?

Low resolution GC/MS provides the ability for fast screening of samples, while GC/MS/MS gives fast and specific confirmation of samples found to contain TCDD in the presence of interferences.

What does quad triple mean?

What is the triple or quad screening? The triple screening measures the amounts of three substances in a pregnant woman’s blood: alpha-fetoprotein (AFP), human chorionic gonadotropin (hCG), and estriol (uE3). When a test for the hormone inhibin A is added, it’s called a quad screening.

Which is better LC-MS or GC-MS?

The only difference is that LC-MS uses a solvent as its mobile phase, while GC-MS uses inert gases (like helium) in the same capacity. 3. GC-MS is the preferred standard for forensic identification, and it is also the preferred machine in terms of costs and operation.