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Development and applications of a rapid back‐flush microseparation system coupled to a mass spectrometer for the quality control of combinatorial libraries
Author(s) -
Marshall Peter S.
Publication year - 1999
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/(sici)1097-0231(19990515)13:9<778::aid-rcm563>3.0.co;2-7
Subject(s) - chemistry , mass spectrometry , quality (philosophy) , process engineering , chromatography , philosophy , epistemology , engineering
A capillary precolumn was coupled directly into a valve switching system for the rapid analysis of discrete solution phase library samples. The samples, provided in dimethyl sulphoxide, are loaded onto the precolumn in an aqueous mobile phase and the trapped analytes are eluted into the mass spectrometer by a back‐flush flow of high organic content. This back‐flush elution procedure provides a very effective in‐line removal of the components in the matrix which are responsible for ion‐suppression. The ion‐suppressing components present in the sample are removed from the precolumn with the aqueous mobile phase before the back‐flush occurrs. In addition to providing an invaluable cleanup, this technique can be used as a preconcentration step. Multiple injections of a sample can be made prior to the back‐flush elution. The analysis of the solution phase discrete samples performed on this system was by positive mode electrospray ionisation. Copyright © 1999 John Wiley & Sons, Ltd.