title: Interfacial molecular imprinting of Stöber particle surfaces: a simple approach to targeted saccharide adsorption.
abstract: The use of surfactant headgroups for interfacial imprinting is established as a simple and tunable approach to create molecularly imprinted silica nanoparticles based on a modification of the Stöber method. Adsorption of D-glucose and D-xylose (initial concentrations ranging from 0.139 to 1.67 mol/l) is measured on silica nanoparticles created by the addition of a glucose-based surfactant (n-octyl-β-D-glucopyranoside (C8G1)) or surfactant mixtures (C8G1 and cetyltrimethylammonium bromide (CTAB)) to Stöber particles shortly after their precipitation. Silica particles synthesized in the presence of C8G1 as an imprinting surfactant have a significantly higher affinity for glucose over xylose (as much as 3.25 times greater at 0.25 M saccharide), and an enhanced affinity for glucose relative to non-imprinted silica particles (as much as 4 times greater at 0.25 M), which adsorb glucose and xylose similarly. Glucose imprinting is significantly enhanced using a surfactant mixture of 1:1 C8G1/CTAB. The interfacial activity of the nonionic imprinting surfactant at the silica surface is suggested to be improved by the presence of interfacial cationic CTAB, which is driven to the silica surface through electrostatic interactions. The concept of imprinting through the interaction of surfactant headgroups with the soft surface of silica particles is supported by the importance of the time of addition of the surfactants. The greatest enhancement in glucose adsorption is observed when the surfactants are added 1 min after precursor addition (at the onset of aggregated particle formation, as indicated by solution turbidity) and the silica affinity for glucose decreases with the time of surfactant addition. The versatility of the surfactant imprinting of Stöber particles is demonstrated by the enhanced adsorption of xylose relative to glucose on particles imprinted using a 1:1 mixture of n-octyl-β-D-xylopyranoside and CTAB, suggesting that the process can be customized to selectively adsorb target molecules of interest.
authors.affiliation: Department of Chemical and Materials Engineering, University of Kentucky, 177 F.P. Anderson Hall, Lexington, KY 40506-0046, USA.
authors.forename: Suvid
authors.initials: S
authors.lastname: Joshi
authors.affiliation: Department of Chemical Engineering, University of Massachusetts Amherst, 686 North Pleasant Street, 159 Goessmann Lab, Amherst, MA 01003, USA.
authors.forename: Alexander
authors.initials: A
authors.lastname: Rao
authors.affiliation: Department of Occupational and Environmental Health, University of Iowa, UI Research Park, 124 IREH, Iowa City, IA 52242, USA.
authors.forename: Hans-Joachim
authors.initials: HJ
authors.lastname: Lehmler
authors.affiliation: Department of Chemical and Materials Engineering, University of Kentucky, 177 F.P. Anderson Hall, Lexington, KY 40506-0046, USA.
authors.forename: Barbara L
authors.initials: BL
authors.lastname: Knutson
authors.affiliation: Department of Chemical and Materials Engineering, University of Kentucky, 177 F.P. Anderson Hall, Lexington, KY 40506-0046, USA. Electronic address: stephen.rankin@uky.edu.
authors.forename: Stephen E
authors.initials: SE
authors.lastname: Rankin
mesh_terms: D000327:Adsorption; D000077286:Cetrimonium; D002593:Cetrimonium Compounds / Q000737:chemistry; D005947:Glucose / Q000302:isolation & purification*; D005960:Glucosides / Q000737:chemistry; D054802:Molecular Imprinting; D053758:Nanoparticles / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D013499:Surface Properties; D013501:Surface-Active Agents / Q000737:chemistry; D014994:Xylose / Q000302:isolation & purification*
chemical_list: D002593:Cetrimonium Compounds; D005960:Glucosides; D013501:Surface-Active Agents; C018619:octyl-beta-D-glucoside; D012822:Silicon Dioxide; D014994:Xylose; D005947:Glucose; D000077286:Cetrimonium
keywords: Adsorption; Glycobiology; Molecular imprinting; Nanoparticles; Separations