Waters Technologies Corporation

Daniel Golick

Marc Victor Gorenstein

Scott Geromanos

Steven J Ciavarini

Guo-Zhong Li

Keith Fadgen

Jeffrey Cruz Silva

Marths Degen Stapels

A method of mass spectrometry is disclosed comprising mass analysing an eluent from a chromatography device and obtaining parent ion data sets and corresponding product ion data sets, and determining whether, in a first product ion data set, one or more product ions are present that are related to one or more parent ions in a corresponding first parent ion data set, based on the mass or mass to charge ratio and/or intensity of the one or more product ions and the one or more parent ions. If it is determined that the one or more product ions are present, the method further comprises removing the one or more product ions from one or more second product ion data sets to produce one or more second modified product ion data sets and/or removing ions other than the one or more product ions from the first product ion data set to produce a first modified product ion data set.

Method to remove ion interferences

A method of analyzing a complex sample includes performing a sequential chromatographic-IMS-MS analysis of a sample to obtain a plurality of experimental mass spectra having isotopic clusters, wherein each spectrum of the plurality of spectra is associated with a chromatographic retention time and an ion-mobility drift time. The method also includes calculating a model isotopic cluster of a precursor or product ion associated with a candidate compound in the sample, in correspondence to the natural isotopic-abundance ratios of elements composing the compound. The method further includes comparing peaks of the model isotopic cluster to corresponding peaks of an isotopic cluster of one of the experimental mass spectra to extract one or more saturated or interfered peaks of the experimental isotopic cluster, wherein at least one of the peaks of the experimental isotopic cluster is un-saturated and un-interfered.

Method and an apparatus for analyzing a complex sample

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Newton, MA, United States of America

Daniel Golick