Aggregation of liposomes in presence of La3+: A study of the fractal dimension

Juan Sabín, Gerardo Prieto, Juan M. Ruso, Paula Messina, and Félix Sarmiento
Phys. Rev. E 76, 011408 – Published 30 July 2007; Erratum Phys. Rev. E 82, 049903 (2010)

Abstract

A study of the fractal dimension of the aggregation of three different types of large unilamellar vesicles, formed by egg yolk phosphatidylcholine (EYPC), dimyristoyl-phosphocholine (DMPC), and dipalmitoyl-phosphocholine (DPPC), in the presence of La3+, is presented. Aggregate liposome fractal dimensions were calculated by two methods, aggregation kinetics, using the approaches diffusion-limited cluster aggregation (DLCA) and reaction-limited cluster aggregation (RLCA) and angle-scattering light dispersion. Electrophoretic measurements show a similar variation of the zeta potential (ζ potential) for EYPC and DPPC, with a small increase of initial positive values. However, the ζ potential of DMPC changes from a initial negative value to near zero with increasing La3+ concentration. The evolution of the aggregate sizes was followed by light scattering. DPPC and DMPC show a RLCA regimen growth at low La3+ concentrations and a DLCA regimen at higher concentrations. In the case of EYPC, the final size of aggregation strongly depends on La3+ concentration. The calculated fractal dimension is in the range 1.8 to 2.1.

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  • Received 8 March 2007

DOI:https://doi.org/10.1103/PhysRevE.76.011408

©2007 American Physical Society

Erratum

Erratum: Aggregation of liposomes in presence of La3+: A study of the fractal dimension [Phys. Rev. E 76, 011408 (2007)]

Juan Sabín, Gerardo Prieto, Juan M. Ruso, Paula Messina, and Félix Sarmiento
Phys. Rev. E 82, 049903 (2010)

Authors & Affiliations

Juan Sabín, Gerardo Prieto, Juan M. Ruso, Paula Messina*, and Félix Sarmiento

  • Biophysics and Interfaces Group, Department of Applied Physics, Faculty of Physics, University of Santiago de Compostela, E-15782 Santiago de Compostela, Spain

  • *Present address: Department of Chemistry, National University of Sud, Bahía Blanca, Argentina.
  • Author to whom correspondence should be addressed. Fax: +34 981 520 676; fsarmi@usc.es

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Issue

Vol. 76, Iss. 1 — July 2007

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