Independent analytical testing. Results apply only to the sample received, for research use only.

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Electrospray ionisation

Seen on mass spectra on reports from other laboratories.

Definition

A soft ionisation technique that transfers molecules from solution into the gas phase as charged ions without breaking them apart. Its softness is what makes it suitable for peptides: the intact molecule survives to be measured.

Related terms

Charge state
The number of charges an ion carries, written as [M+nH]ⁿ⁺ for a peptide that has picked up n protons.
Mass-to-charge ratio
The quantity a mass analyser actually sorts on, written m/z.

About mass spectrometry

Terms a reader meets on mass-spectrometric reports from other laboratories, and on confirmatory work sent out. This laboratory has no in-house mass spectrometer, and its certificates carry no mass spectrum.

DeconvolutionObserved massTheoretical massMass accuracyIsotope patternIon suppressionIsobaricStereoisomerRetro-inverso peptide

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