Medical

base peak

Also found in: Encyclopedia.

base peak

The ion in a mass spectrum with the highest measured abundance.
The relative abundance of the base peak ion is assigned a value of 100, and the abundances of all other ions plotted in that mass spectrum are normalised to that value. The y-axis in a mass spectrum is therefore given in terms of relative abundance.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
References in periodicals archive
This applies to any SMN mutated site; when the percentage of variant base peak is similar to that of differential site on exon 7, it implies that the mutation is in SMN1 [Figure 6].
M = 110 is base peak. m/z PICS 67% interval 95% interval unc.
All the fragmentations of cellulose are present and the base peak of fragmentation appears at m/e 76 due to positive ion or free radical positive ion of CS2.
The base peak at m/z 545 corresponding to the loss of 30 u (methoxy group) from fragment ion at m/z 575 was indicative of the presence of a methyl group on the flavone moiety (chrysoeriol) in compound 5.
The mass spectra exhibited m/z 437 (M-45, 392, 1.0%) with a base peak at 148 for the fragment [C.sub.7][H.sub.3][N.sub.3]F.
The complex A showed base peak at m/z = 152 due to [C.sub.10][H.sub.17]N fragment ion and 4,4'-dimethoxy-2,2'-bipyridine ligand in the complex showed peak at m/z = 217 with relative intensity of 25%.
A third approach is to align the "Base Peak" chromatograms, as performed by SIEVE from Thermo Scientific, and a fourth approach is an alignment using MS/MS scan times (identified peptides), such as that found in IDEAL-Q [24].
Mass spectral data of (2) indicated that this compound was a nonadienol which readily dehydrated to give an ion at m/e 122 and other prominent ions at m/e 67, 93, 79, 55 and 41; mass spectrum of (3) resembles a sesquiterpene with molecular ion of m/z 204, with characteristic ions at 49 (base peak), 84, 105, 133, 147, 161, 175 and 189; the mass spectrum of peak (7) showed characteristic ions at 49 (base peak), 93, 107, 119, 135, 161, 189 and molecular ion m/z 204; peak (8) displayed a molecular ion of m/z 204, with characteristic ions at 41, 91, 197, 135 (bases peak); and peak (9) had a molecular ion of m/z 204, with characteristic ions at 49 (base peak), 84, 105, 133, 147, 161, 175 and 189.
The mass spectral data recorded an odd number base peak at 163 M/Z for a compound whose molecular weight was observed at 194 M/Z.
One of the resulting peaks is a hydroxylation metabolite at 603.2805 m/z that elutes after 8.45 minutes and has an intensity that is less than 15% relative to the base peak in the same spectrum.
Copyright © 2003-2025 Farlex, Inc Disclaimer
All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional.