Interaction of algal polysaccharide with lipid Langmuir monolayers

Interaction of algal polysaccharide with lipid Langmuir monolayers

Author Brito, Audrey Kalinouski de Autor UNIFESP Google Scholar
Caseli, Luciano Autor UNIFESP Google Scholar
Nordi, Cristina S. F. Autor UNIFESP Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Abstract Algal polysaccharides may assist in the incorporation of metal ions from water and also have applications in health, interacting with biomembranes. in this paper, we have exploited the interactions at the molecular level of an extract of extracellular algal polysaccharide (EPS) with biomembrane models (lipid Langmuir monolayers). From surface pressure-area isotherms and Polarization Modulation Infrared ReflectionAbsorption Spectroscopy (PM-IRRAS), we have inferred that EPS interacts with both kinds of lipids: a negatively charged and a positively charged, however with different mechanisms of action. EPS, being negatively charged, interacts with the polar heads of the positively charged lipid monolayer, while for a negatively charged lipid forming the Langmuir film, EPS penetrates into the alkyl chains of lipid in a mechanism driven mainly by hydrophobic interactions. the insights obtained in this paper are relevant because these help to understand the action of EPS in biomembranes and enable future applications of EPS-lipid hybrid Langmuir-Blodgett films for heavy metal ion sensors. (C) 2011 Elsevier B.V. All rights reserved.
Keywords Langmuir monolayer
Algal polysaccharide
Air-water interface
Metal ion sensor
Language English
Date 2011-12-01
Published in Materials Science & Engineering C-materials for Biological Applications. Amsterdam: Elsevier B.V., v. 31, n. 8, p. 1857-1860, 2011.
ISSN 0928-4931 (Sherpa/Romeo, impact factor)
Publisher Elsevier B.V.
Extent 1857-1860
Access rights Closed access
Type Article
Web of Science ID WOS:000297400800036

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