Glossary

Protonated molecule

A protonated molecule, written [M+H]⁺, is the ion formed when a neutral molecule gains a proton during positive-mode ionisation. Its m/z equals the molecular mass plus about 1.007 Da. Multiply protonated forms such as [M+2H]²⁺ are common for peptides analysed by electrospray ionisation.

Source: en.wikipedia.org

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