DIODE ARRAY DETECTOR ELECTROSPRAY MASS SPECTROMETRY LIQUID CHROMATOGRAPHY AS APPLIED TO PARTIALLY OVERLAPPING PEAKS

Yıl 2000, Cilt: 2 Sayı: 2, 34 - 34, 01.06.2000

Richard G Brereton

Öz

It is now common to obtain information from two or more detectors
in HPLC simultaneously. Conventionally both DAD-HPLC and LC-MS data
are obtained independently, often using quite different approaches, but there
will be common features in both types of information. However, these will
be distorted, for example, Electrospray MS profiles are typically more noisy
and tailing compared to those from DAD-HPLC due to the different physical
processes of passing from the chromatographic column to the detector. A
method for obtaining and processing both types of data simultaneously is
described. The analysis of isomers with identical molecular weights and
similar elution times is particularly important in the pharmaceutical industry
where small impurities can have a major influence on biological activity.
The approach is illustrated by application to a mixture of 2- and 3-
hydroxypyridine at varying levels of overlap.