title: Isolation of oligogalacturonic acids up to DP 20 by preparative high-performance anion-exchange chromatography and pulsed amperometric detection.
abstract: Milligram quantities of oligogalacturonic acids up to a degree of polymerization (DP) of 20 were purified by high-performance anion-exchange chromatography utilizing a preparative-scale (21-mm i.d.) CarboPac PA1 column and a nonlinear potassium acetate (pH 7.5) gradient. Detection was accomplished by pulsed amperometry without post-column addition of hydroxide. Pulsed amperometry at near-neutral pH is an excellent detection method for preparative separations of carbohydrates because it avoids base-catalyzed degradation reactions that can occur at high pH. This method was simpler, faster, had higher sample loading capacity and allowed for the isolation of higher DP oligogalacturonic acids than other methods reported previously. With this improved method, multi-milligram quantities of valuable oligogalacturonic acids (up to DP 20) can be readily isolated.
authors.affiliation: US Department of Agriculture, ARS, Eastern Regional Research Center, 600 East Mermaid Lane, Wyndmoor, PA 19038, USA. ahotchkiss@arserrc.gov
authors.forename: A T
authors.initials: AT
authors.lastname: Hotchkiss
authors.forename: S L
authors.initials: SL
authors.lastname: Lecrinier
authors.forename: K B
authors.initials: KB
authors.lastname: Hicks
mesh_terms: D002852:Chromatography, Ion Exchange / Q000379:methods*; D004563:Electrochemistry; D006863:Hydrogen-Ion Concentration; D009844:Oligosaccharides / Q000302:isolation & purification*; D011108:Polymers / Q000302:isolation & purification
chemical_list: D009844:Oligosaccharides; D011108:Polymers; C412763:oligogalacturonic acid