title: Development of a reversed-phase high-performance liquid chromatography method for the analysis of components from a closed-loop insulin delivery system.
abstract: A reversed-phase HPLC method has been developed which enables separation of the three components of a closed-loop insulin delivery system, namely concanavalin A methacrylamide (Con A-MA), dextran methacrylate (Dex-MA) and bovine insulin. The analysis of Con A-MA represents a significant challenge due to the formation of multiple conformations on contact with the chromatographic surface and the mobile phase. The extent of conformational change is shown to be dependent on a number of parameters: column temperature, mobile phase pH, contact time with the chromatographic surface, salt type and concentration and the organic modifier. By manipulation of these variables, protein denaturation can be minimised and recovery improved.
authors.affiliation: Leicester School of Pharmacy, Faculty of Health and Life Sciences, De Montfort University, The Gateway, Leicester LE1 9BH, UK.
authors.forename: Kirsty
authors.initials: K
authors.lastname: Sawicka
authors.forename: Tarsem
authors.initials: T
authors.lastname: Sahota
authors.forename: M Joan
authors.initials: MJ
authors.lastname: Taylor
authors.forename: Sangeeta
authors.initials: S
authors.lastname: Tanna
mesh_terms: D000178:Acrylamides / Q000737:chemistry; D000818:Animals; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D003208:Concanavalin A / Q000737:chemistry; D003911:Dextrans / Q000737:chemistry; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007328:Insulin / Q000008:administration & dosage* / Q000737:chemistry; D007332:Insulin Infusion Systems; D011487:Protein Conformation; D015203:Reproducibility of Results; D013696:Temperature
chemical_list: D000178:Acrylamides; D003911:Dextrans; D007328:Insulin; D003208:Concanavalin A; C045985:methacrylamide