title: Development of improved nanoparticulate polyelectrolyte complex physicochemistry by nonstoichiometric mixing of polyions with similar molecular weights.
abstract: Water-based, biodegradable polyelectrolyte complex dispersions (PECs) prepared by mixing oppositely charged polyions are advantageous drug delivery systems due to constituent biocompatibility and nanoparticulate architectures. Reaction phase environmental parameters dictate PEC physicochemical properties, and specifically, complexation between polyelectrolytes having significantly different molecular weights leads to formation of water-insoluble aggregates. Starting with this fact, four-component similar and dissimilar molecular weight PEC chemistries were applied and compared with and without frequency-induced dispergation. The goal was to define nanoparticulate PEC systems with desirable characteristics for use in biological systems. Results show PEC formulations from precursors with similar low molecular weights yielded dispersions with suitable physicochemical characteristics, as verified by photon correlation spectroscopy and TEM, presumably due to efficient ion pairing. Similar low molecular weight PECs fabricated with dispergation exhibited pH-independent stability, as validated by charge and size measurements. These physicochemical advantages lead to an ideal delivery platform.
authors.affiliation: Department of Chemical Engineering, Vanderbilt University, Nashville, Tennessee 37235-1604, USA.
authors.forename: Sean M
authors.initials: SM
authors.lastname: Hartig
authors.forename: Gianluca
authors.initials: G
authors.lastname: Carlesso
authors.forename: Jeffrey M
authors.initials: JM
authors.lastname: Davidson
authors.forename: Ales
authors.initials: A
authors.lastname: Prokop
mesh_terms: D001672:Biocompatible Materials; D002627:Chemistry, Physical / Q000379:methods; D003102:Colloids / Q000737:chemistry*; D004573:Electrolytes / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007477:Ions; D046911:Macromolecular Substances; D046529:Microscopy, Electron, Transmission; D008970:Molecular Weight; D053758:Nanoparticles / Q000737:chemistry*; D010455:Peptides / Q000737:chemistry; D011108:Polymers / Q000737:chemistry; D012995:Solubility; D014867:Water / Q000737:chemistry
chemical_list: D001672:Biocompatible Materials; D003102:Colloids; D004573:Electrolytes; D007477:Ions; D046911:Macromolecular Substances; D010455:Peptides; D011108:Polymers; D014867:Water