Evaporation-induced monolayer compression improves droplet interface bilayer formation using unsaturated lipids
- Univ. of Tennessee, Knoxville, TN (United States). Department of Mechanical, Aerospace, and Biomedical Engineering
- Univ. of Tennessee, Knoxville, TN (United States). Department of Mechanical, Aerospace, and Biomedical Engineering and Bredesen Center; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Joint Institute for Biological Sciences
- Univ. of Tennessee, Knoxville, TN (United States). Department of Biochemistry, Cellular and Molecular Biology
- Univ. of Tennessee, Knoxville, TN (United States). Department of Mechanical, Aerospace, and Biomedical Engineering; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Joint Institute for Biological Sciences and Center for Nanophase Materials Sciences
In this paper, we report on a new experimental methodology to enable reliable formation of droplet interface bilayer (DIB) model membranes with two types of unsaturated lipids that have proven difficult for creating stable DIBs. Through the implementation of a simple evaporation technique to condition the spontaneously assembled lipid monolayer around each droplet, we increased the success rates of DIB formation for two distinct unsaturated lipids, namely 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) and 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC), from less than 10% to near 100%. Separately, using a pendant drop tensiometer, we learned that: (a) DOPC and POPC monolayers do not spontaneously assemble into their tightest possible configurations at an oil-water interface, and (b) reducing the surface area of a water droplet coated with a partially packed monolayer leads to a more tightly packed monolayer with an interfacial tension lower than that achieved by spontaneous assembly alone. We also estimated from Langmuir compression isotherms obtained for both lipids that the brief droplet evaporation procedure prior to DIB formation resulted in a 6%–16% reduction in area per lipid for DOPC and POPC, respectively. Lastly, the increased success rates of formation for DOPC and POPC DIBs enabled quantitative characterization of unsaturated lipid membrane properties including electrical resistance, rupture potential, and specific capacitance.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1468062
- Journal Information:
- Biomicrofluidics, Vol. 12, Issue 2; ISSN 1932-1058
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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