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Biomacromolecules

Title:		Water-stable all-biodegradable microparticles in nanofibers by electrospinning of aqueous dispersions for biotechnical plant protection
Author(s):		Bansal P; Bubel K; Agarwal S; Greiner A;
Address:		"Department of Chemistry and Scientific Centre for Materials Science, Philipps-Universitat Marburg, Hans-Meerwein-Strasse, Geb H, D-35032 Marburg, Germany"
Journal Title:		Biomacromolecules
Year:		2012
Volume:		20120124
Issue:		2
Page Number:		439 - 444
DOI:		10.1021/bm2014679
ISSN/ISBN:		1526-4602 (Electronic) 1525-7797 (Linking)
Abstract:		"Pheromone eluting oligolactide (OLA) microcapsules immobilized in electrospun biodegradable polyester nanofibers were obtained by electrospinning of aqueous dispersions of the microcapsules. OLA was prepared by conventional melt polycondensation of lactic acid. Following the protocol of the solvent displacement method, OLA was dissolved in acetone and mixed with Brij S20 and the pheromone of the European grape vine moth, Lobesia Botrana, (E,Z)-7,9-dodecadien-l-yl acetate (DA). Up to 32 wt % of this mixture could be dispersed in water with colloidal stability of several weeks without any sedimentation. Without DA as well as OLA, no stable dispersions of OLA in water were obtained. Replacement of DA by classical hydrophobes typically used for miniemulsions did not yield stable dispersions, but the addition of octyl acetate, which shows structural similarity to DA, yielded stable dispersions in water up to 10 wt %. Dispersions of OLA/DA were successfully electrospun in combination with an aqueous dispersion of a biodegradable block copolyester resulting in water-stable nanofibers containing OLA/DA microcapsules. Release of DA from microcapsules and fibers was retarded in comparison with non-encapsulated DA, as shown by model studies"
Keywords:		"Acetates/chemistry Animals Biodegradation, Environmental Capsules/chemistry Dodecanol/*analogs & derivatives/chemistry Electrochemistry Emulsions Hydrophobic and Hydrophilic Interactions Insect Repellents/*chemical synthesis Microscopy, Electron, Scanning;"
Notes:		"MedlineBansal, Priyanka Bubel, Kathrin Agarwal, Seema Greiner, Andreas eng Research Support, Non-U.S. Gov't 2012/01/04 Biomacromolecules. 2012 Feb 13; 13(2):439-44. doi: 10.1021/bm2014679. Epub 2012 Jan 24"