title: Microfluidic etching and oxime-based tailoring of biodegradable polyketoesters.
abstract: A straightforward, flexible, and inexpensive method to etch biodegradable poly(1,2,6-hexanetriol alpha-ketoglutarate) films is reported. Microfluidic delivery of the etchant, a solution of NaOH, can create micron-scale channels through local hydrolysis of the polyester film. In addition, the presence of a ketone in the repeat unit allows for prior or post chemoselective modifications, enabling the design of functionalized microchannels. Delivery of oxyamine tethered ligands react with ketone groups on the polyketoester to generate covalent oxime linkages. By thermally sealing an etched film to a second flat surface, poly(1,2,6-hexanetriol alpha-ketoglutarate) can be used to create biodegradable microfluidic devices. In order to determine the versatility of the microfluidic etch technique, poly(epsilon-caprolactone) was etched with acetone. This strategy provides a facile method for the direct patterning of biodegradable materials, both through etching and chemoselective ligand immobilization.
authors.affiliation: Department of Chemistry and the Carolina Center for Genome Science, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, USA.
authors.forename: Devin G
authors.initials: DG
authors.lastname: Barrett
authors.forename: Brian M
authors.initials: BM
authors.lastname: Lamb
authors.forename: Muhammad N
authors.initials: MN
authors.lastname: Yousaf
mesh_terms: D000096:Acetone / Q000737:chemistry; D001672:Biocompatible Materials / Q000737:chemistry*; D002152:Calorimetry, Differential Scanning; D004058:Diffusion; D004952:Esters / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000494:pharmacology; D007659:Ketones; D008024:Ligands; D046210:Microfluidic Analytical Techniques; D044085:Microfluidics / Q000379:methods*; D008855:Microscopy, Electron, Scanning; D010091:Oximes / Q000737:chemistry*; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors
chemical_list: D001672:Biocompatible Materials; D004952:Esters; D005456:Fluorescent Dyes; D007659:Ketones; D008024:Ligands; D010091:Oximes; D000096:Acetone