Glossary

Adduct ion

An adduct ion is formed when a molecule associates with an ion other than a proton, such as sodium [M+Na]⁺, potassium [M+K]⁺ or ammonium [M+NH4]⁺. Adducts appear at characteristic mass offsets from the protonated species and are common in peptide mass spectra. They must be distinguished from genuine impurities.

Source: en.wikipedia.org

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