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Title: Morphology-induced defects enhance lipid transfer rates

Journal Article · · Langmuir
 [1];  [1];  [2];  [3];  [3];  [3];  [3];  [1];  [1]
  1. Univ. of Connecticut, Storrs, CT (United States)
  2. Univ. of Graz, Graz (Austria); Brock Univ., St. Catharines, ON (Canada)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Molecular transfer between nanoparticles has been considered to have important implications regarding nanoparticle stability. Recently, the interparticle spontaneous lipid transfer rate constant for discoidal bicelles was found to be very different from spherical, unilamellar vesicles (ULVs). Here, we investigate the mechanism responsible for this discrepancy. Analysis of the data indicates that lipid transfer is entropically favorable, but enthalpically unfavorable with an activation energy that is independent of bicelle size and long- to short-chain lipid molar ratio. Moreover, molecular dynamics simulations reveal a lower lipid dissociation energy cost in the vicinity of interfaces (“defects”) induced by the segregation of the long- and short-chain lipids in bicelles; these defects are not present in ULVs. Taken together, these results suggest that the enhanced lipid transfer observed in bicelles arises from interfacial defects as a result of the hydrophobic mismatch between the long- and short-chain lipid species. In conclusion, the observed lipid transfer rate is found to be independent of nanoparticle stability.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1327689
Journal Information:
Langmuir, Vol. 32, Issue 38; ISSN 0743-7463
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 10 works
Citation information provided by
Web of Science

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