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• W2105075737 startingPage "2014" @default.
• W2105075737 abstract "The analysis of oligonucleotides using matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) has led to the investigation of the use of matrix additives (i.e., co-matrices) to help improve the poor spectral quality commonly observed during the analysis of this class of compounds. The use of certain matrix additives in MALDI-MS has been investigated previously, and these additives have been shown to enhance the desorption/ionization efficiency of oligonucleotides during the MALDI experiment. Specifically, amine bases, such as piperidine, imidazole, and triethylamine, have been shown to improve mass spectral quality as assessed by improved molecular ion resolution and increased molecular ion abundance. These improvements occur due to competition between the oligonucleotide and the co-matrix for protons generated during the MALDI event. Co-matrices with proton affinities near or above the proton affinities of the nucleotide residues serve as proton sinks during the desorption/ionization process. In this work, we have investigated the use of polyamines as co-matrices for MALDI mass spectrometric analysis of oligonucleotides. Spermine tetrahydrochloride, spermine, spermidine trihydrochloride, and spermidine were evaluated for their effectiveness at enhancing the mass spectral quality of oligonucleotides analyzed using MALDI-MS. The solution-phase pK( b) values and the gas-phase proton affinities of these polyamines were determined, and it was found that the polyamines appear to be more basic than the monofunctional amines investigated previously. The mass spectral data shows that spermidine and spermine are extremely effective co-matrices, yielding improved molecular ion resolution and molecular ion abundances. The spermine co-matrices are more effective than the spermidine co-matrices, but adduction problems with the spermine co-matrices limits their overall utility. In general, polyamine co-matrices are found to be more effective than monofunctional amine co-matrices at improving the mass spectral data obtained during MALDI-MS of oligonucleotides." @default.
• W2105075737 created "2016-06-24" @default.
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• W2105075737 date "1999-10-30" @default.
• W2105075737 modified "2023-10-17" @default.
• W2105075737 title "Polyamine co-matrices for matrix-assisted laser desorption/Ionization mass spectrometry of oligonucleotides" @default.
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• W2105075737 doi "https://doi.org/10.1002/(sici)1097-0231(19991030)13:20<2014::aid-rcm748>3.0.co;2-c" @default.
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