Abstract
Abstract Problems associated with the use of tetrabutylammonium fluoride like incomplete desilylation and removal of the tetrabutylammonium salts during large scale syntheses of oligoribonucleotides (RNA) have been eliminated by the use of triethylamine trihydrofluoride and precipitation of the RNA with 1-butanol. An efficient anion-exchange HPLC method has been developed for the purification of chemically synthesized RNA and the resulting product precipitated directly by the addition of 1-propanol. A new activator, 5-ethylthio-1H-tetrazole significantly enhances the synthesis quality and yield of oligoribonucleotides. RNA synthesized using these improvements has been shown to be biologically active by a comparative ribozyme-substrate assay.
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