Kendrick mass

[1][2] This definition of mass was first suggested in 1963 by chemist Edward Kendrick,[1] and it has been adopted by scientists working in the area of high-resolution mass spectrometry, environmental analysis,[3][4][5][6] proteomics, petroleomics,[2] metabolomics,[7] polymer analysis,[8] etc.

As an example, Kendrick analysis has been used for visualizing families of halogenated compounds of environmental interest that differ only by the number of chlorine, bromine or fluorine substitutions.

[16] The Kendrick mass defect is defined as the exact Kendrick mass subtracted from the nominal (integer) Kendrick mass:[17][18] In recent years the equation has changed due to rounding errors to: The members of an alkylation series have the same degree of unsaturation and number of heteroatoms (nitrogen, oxygen and sulfur) but differ in the number of CH2 units.

Alternatively, a KMD plot can be constructed for the same copolymer by using propylene oxide as the base unit.

Polymer mass spectra containing multiple charge ions exhibit isotopic splitting.

[23] Kendrick mass defect plots created by using fractional base units exhibit enhanced resolution.