Volpi N Separation of capsular polysaccharide K4 and defructosylated K4 derived disaccharides by high-performance capillary electrophoresis and high-performance liquid chromatography Electrophoresis24(6) (2003)
1063-1068
NCBI PubMed ID:12658696 Journal NLM ID:8204476 Publisher: Wiley-VCH Correspondence: volpiunimo.it Institutions: Dipartimento di Biologia Animale, University of Modena and Reggio Emilia, Modena, Italy
A rapid, highly sensitive and reproducible high-performance capillary electrophoresis (HPCE) method (electrokinetic chromatography with sodium dodecyl sulfate) is described for the determination of disaccharides present in the polysaccharide from the uropathogenic Escherichia coli K4 bacteria (05:K4:H4) and its defructosylated product. Following chondroitinase digestion of K4 and its derivative, the two disaccharides, ∆HexAFrc-GalNAc for K4 and ∆HexA-GalNAc for defructosylated K4, are separated and readily determined within 20 min on an uncoated fused-silica capillary using normal polarity at 20 kV and detection at 230 nm. Comparison was made by separation of these two disaccharides in isocratic strong-anion exchange HPLC. A linear relationship was found for the two unsaturated disaccharides over a wide range of concentrations, from approximately 0.5 to 5 micro g for high-performance liquid chromatography (HPLC) and from approximately 0.06 to 0.3 micro g for HPCE. The HPCE separation produced a greater detection sensitivity (about 10 times greater) than HPLC. The described methods were used to evaluate the defructosylation process of K4 under drastic acid conditions. Good correspondence was found for the amount of unsaturated disaccharides for the two techniques.
Methods: HPLC, defructosylation, enzymatic digestion, capillary electrophoresis (CE) Enzymes that release or process the structure: chondroitinase Comments, role: product obtained by chondroitinase digestion of capsular polysaccharide
Related record ID(s): 8617, 8800, 8802 NCBI Taxonomy refs (TaxIDs):562 Reference(s) to other database(s): GlycomeDB:36805 Show glycosyltransferases
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