Further confirmation of the structural assignments was gleaned from MALDI-collision-induced dissociation (MALDI-CID) experiments.
The higher resolution of this structure (2.8 Å vs 3.35 Å) enables confirmation of the inferred stereochemical assignments at stereocenters of GE and enables identification of additional water-mediated H-bonds, including additional water-mediated H-bonds in the network of water-mediated interactions connecting GE to Mg2+(I).
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A definitive diagnosis of sepsis was unlikely to be known at the time patients were enrolled in the study; thus confirmation of sepsis and assignment of patients to the sepsis cohort was made retrospectively.
Final confirmation of the structure, including the unambiguous stereochemical assignment, occurred 10 years later through a 12-step chemical synthesis from d-glucosamine.
Biosynthesis of resveratrol glucuronide using UDP glucuronyl transferase and liver microsomes generated material, which on cochromatography eluted with peak 1. Mass spectral analysis did not allow unequivocal confirmation of its structural assignment as either the 3 or 4′ glucuronide.
The fragmentation pattern of a synthetic peptide should therefore be highly similar to that of a "real" peptide with the same sequence, making it possible to use synthetic peptides as a source of validatory spectra when seeking confirmation of a peptide assignment by MS/MS.
Response factors generated from authentic monosaccharide standards were used for quantitation of pneumococcal polysaccharides and conjugates with confirmation of peak assignments by retention time and mass spectral analysis.
This trend could potentially assist in confirmation of phosphosite assignments in peptides containing multiple Ser, Thr, or Tyr residues.
