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Isobaric

Seen on limitation statements.

Definition

Having the same nominal mass as another compound. Isobaric species cannot be told apart by mass measurement alone and need chromatographic separation or an orthogonal approach.

Related terms

Orthogonal method
A second method that separates or detects on a different physical principle from the first, so that what the first method could not distinguish, the second can.
Stereoisomer
A molecule with the same atoms and connectivity but a different three-dimensional arrangement.

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.

Electrospray ionisationMass-to-charge ratioCharge stateDeconvolutionObserved massTheoretical massMass accuracyIsotope patternIon suppressionRetro-inverso peptide

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