Mass spectrometer device

A mass spectrometer is an instrument that measures the mass-to-charge ratio of ions, essential for identifying substances in chemistry and biology.

About this subject

A mass spectrometer is an analytical instrument that determines the molecular and elemental composition of samples. Its principle involves ionization of molecules, separation of ions based on their mass-to-charge ratio (m/z), and detection. Developed by Francis Aston in the early 20th century, the device enabled the discovery of isotopes and revolutionized analytical chemistry.

There are several types of mass spectrometers, such as the quadrupole, time-of-flight (TOF), and Orbitrap. Each has specific advantages: the quadrupole is robust and common in gas chromatography-mass spectrometry (GC-MS), while TOF offers high resolution and speed. The Orbitrap, developed in the 2000s, provides exceptional precision for proteomics.

In practice, mass spectrometers are used in medical diagnostics (newborn screening, drug detection), pharmaceutical quality control, environmental analysis (pollutants, pesticides), and security (explosives). A curious fact: modern instruments can detect amounts on the order of attomoles (10^-18 mol), equivalent to a few hundred molecules.

Frequently Asked Questions

How does a mass spectrometer work?

It ionizes sample molecules, separates the ions by mass-to-charge ratio (m/z) using electric or magnetic fields, and detects them, producing a mass spectrum that identifies the compounds.

What are the main types of mass spectrometers?

The most common are quadrupole, time-of-flight (TOF), Orbitrap, and Fourier transform ion cyclotron resonance (FT-ICR). Each is suited for different applications, varying in resolution and sensitivity.

How is mass spectrometry used in medicine?

It is used for newborn screening to detect metabolic diseases, identifying cancer biomarkers, and monitoring levels of therapeutic drugs or drugs of abuse in blood.