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Nucleic Acids Research, 1995, Vol. 23, No. 8 1367-1373
© 1995
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A procedure for selective DNA alkylation and detection by mass spectrometry
DNA Sequencing Laboratory, imperial Cancer Research Fund PO Box 123, 44 Lincoln's Inn Fields, London WC2A 3PX, UK
*To whom correspondence should be addressed
Received December 22, 1994. Revised March 9, 1995. Accepted March 9, 1995.
A method which improves the detectability of DNA by mass spectrometry is presented. By quantitatively alkylating the backbone of phosphorothioate oligonucleotides the problems of gas phase ion generation by matrix assisted laser desorption ionization can be controlled. We have developed a selective alkylating protocol for phosphorothioate oligonucleotides whichis a facile way of generating non-ionic nucleic acids. A variety of alkylating agents was studied and their kinetics were monitored in a gel electrophoretic assay and by mass spectrometry.
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