The gentler, resolution-based ES ionization produces ions with a distribution of net cost states that spreads the molecule signal amongst several mass-spectrometric peaks, complicating interpretation of the resulting mass spectrum. This downside is compounded by salts associating with the molecule in the course of the pattern-preparation process. Richard Smith reported putting reduction of salt content by incorporating an online microdialysis unit earlier than the ionizing step. Both single- or double-stranded PCR products of a hundred bp might be analyzed and correct mass measurements obtained without any detectable fragmentation that will make sequencing much more troublesome. The researchers additionally demonstrated a way for dynamic range expansion using Fourier transform ion cyclotron resonance MS that considerably extends the helpful learn length for sequencing.
Lloyd Smith’s laboratory is exploring causes for DNA fragmentation during MALDI from a solid matrix. Fragmentation depends on sequence as well as matrix, and chemical modification might limit the breakage. Smith’s group identified a base-protonation mechanism they imagine is involved in strand breakage, and the crew is now developing a set of modified nucleotides that could provide safety.
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