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Title: Reversible, on-demand generation of aqueous two-phase microdroplets

Patent ·
OSTI ID:1375237

The present invention provides methods of on-demand, reversible generation of aqueous two-phase microdroplets core-shell microbeads, microparticle preparations comprising the core-shell microbeads, and drug delivery formulation comprising the microparticle preparations. Because these aqueous microdroplets have volumes comparable to those of cells, they provide an approach to mimicking the dynamic microcompartmentation of biomaterial that naturally occurs within the cytoplasm of cells. Hence, the present methods generate femtoliter aqueous two-phase droplets within a microfluidic oil channel using gated pressure pulses to generate individual, stationary two-phase microdroplets with a well-defined time zero for carrying out controlled and sequential phase transformations over time. Reversible phase transitions between single-phase, two-phase, and core-shell microbead states are obtained via evaporation-induced dehydration and water rehydration.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC05-00OR22725
Assignee:
UT-BATTELLE, LLC
Patent Number(s):
9,730,898
Application Number:
13/970,724
OSTI ID:
1375237
Resource Relation:
Patent File Date: 2013 Aug 20
Country of Publication:
United States
Language:
English

References (31)

Generation of Monodisperse Droplets by Shape-Induced Shear and Interfacial Controlled Fusion of Individual Droplets On-Demand patent-application December 2012
Monodisperse Water-in-Water-in-Oil Emulsion Droplets journal January 2011
Interfacial tension controlled fusion of individual femtolitre droplets and triggering of confined chemical reactions on demand journal January 2010
Budding and Asymmetric Protein Microcompartmentation in Giant Vesicles Containing Two Aqueous Phases journal January 2008
Rapid cell extraction in aqueous two-phase microdroplet systems journal January 2010
Self-Propelled Dropwise Condensate on Superhydrophobic Surfaces journal October 2009
Microcompartmentation in Artificial Cells: pH-Induced Conformational Changes Alter Protein Localization journal April 2010
Polymer Encapsulation within Giant Lipid Vesicles journal June 2007
Flow of microgel capsules through topographically patterned microchannels journal January 2007
Precisely targeted delivery of cells and biomolecules within microchannels using aqueous two-phase systems journal July 2011
Size-dependent detachment of DNA molecules from liquid–liquid interfaces journal January 2011
Aqueous Phase Separation in Giant Vesicles
  • Helfrich, Marcus R.; Mangeney-Slavin, Lauren K.; Long, M. Scott
  • Journal of the American Chemical Society, Vol. 124, Issue 45, p. 13374-13375 https://doi.org/10.1021/ja028157+
October 2002
Complete Budding and Asymmetric Division of Primitive Model Cells To Produce Daughter Vesicles with Different Interior and Membrane Compositions journal June 2011
Rounded multi-level microchannels with orifices made in one exposure enable aqueous two-phase system droplet microfluidics journal January 2011
Tunable spatial heterogeneity in structure and composition within aqueous microfluidic droplets journal June 2012
Transition from Complete to Partial Wetting within Membrane Compartments journal September 2008
Membrane nanotubes induced by aqueous phase separation and stabilized by spontaneous curvature journal March 2011
Wetting-Induced Budding of Vesicles in Contact with Several Aqueous Phases journal February 2012
Dynamic microcompartmentation in synthetic cells journal March 2005
Stepwise Synthesis of Giant Unilamellar Vesicles on a Microfluidic Assembly Line journal March 2011
Electrophoretic partitioning of proteins in two-phase microflows journal January 2007
Continuous-Flow Fractionation of Animal Cells in Microfluidic Device Using Aqueous Two-Phase Extraction journal September 2005
Affinity Two-Phase Partitioning in Acoustically Levitated Drops journal January 2004
Forced generation of simple and double emulsions in all-aqueous systems journal April 2012
Microfluidic fabrication of water-in-water (w/w) jets and emulsions journal March 2012
Monodisperse w/w/w Double Emulsion Induced by Phase Separation journal August 2012
Microfluidic aqueous two phase system for leukocyte concentration from whole blood journal October 2008
Microextraction in a tetrabutylammonium bromide/ammonium sulfate aqueous two-phase system and electrohydrodynamic generation of a micro-droplet journal August 2007
Cell separation by an aqueous two-phase system in a microfluidic device journal January 2009
Microfluidic generation of microgels from synthetic and natural polymers journal January 2009
Monodisperse hydrogel microspheres by forced droplet formation in aqueous two-phase systems journal January 2011