The effect of phospholipids, 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) and phospholipase A2 (PLA2), in the presence of calcium ions on surface properties of silica particles was investigated by means of zeta potential, mean diameter and light transmittance. Silica particles were precoated with the monolayer or the bilayer of the phospholipid from the chloroform solution (silica/DPPC) or coated by DPPC adsorption (silica+DPPC) from the aqueous solution containing calcium ions. It was found that the presence of Ca2+ ions improved remarkably neutral phospholipid (DPPC) adsorption on the silica surface. The obtained silica suspensions were found to be stable probably due to steric stabilization. The zeta potential of silica/DPPC suspension and the light transmittance through the suspension decrease after the PLA2 action in 1 mM calcium chloride solution were probably due to the hydrolysis products adsorption on the silica particles and formation of insoluble calcium palmitate molecules.
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March 2015
Research Article|
March 01 2015
Influence of DPPC layers and PLA2 on surface properties of silica particles
Aleksandra Szczes, DSc;
Aleksandra Szczes, DSc
*
Assistant professor, Department of Physical Chemistry-Interfacial Phenomena, Maria Curie-Sklodowska University, Lublin, Poland
*Corresponding author e-mail address: aszczes@umcs.pl
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Lucyna Holysz, DSc
Lucyna Holysz, DSc
Professor, Department of Physical Chemistry-Interfacial Phenomena, Maria Curie-Sklodowska University, Lublin, Poland
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This article is dedicated to Professor Emil Chibowski on his 70th birthday.
*Corresponding author e-mail address: aszczes@umcs.pl
Publisher: Emerald Publishing
Received:
October 29 2013
Accepted:
December 10 2013
Online ISSN: 2050-6260
Print ISSN: 2050-6252
ICE Publishing: All rights reserved
2015
Surface Innovations (2015) 3 (1): 3–9.
Article history
Received:
October 29 2013
Accepted:
December 10 2013
Citation
Szczes A, Holysz L (2015), "Influence of DPPC layers and PLA2 on surface properties of silica particles". Surface Innovations, Vol. 3 No. 1 pp. 3–9, doi: https://doi.org/10.1680/si.13.00027
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