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Salt- and pH-induced desorption: Comparison between non-aggregated and aggregated mussel adhesive protein, Mefp-1, and a synthetic cationic polyelectrolyte
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.ORCID iD: 0000-0002-2288-819X
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.
2013 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 408, 82-86 p.Article in journal (Refereed) Published
Abstract [en]

Mussel adhesive proteins are of great interest in many applications due to their ability to bind strongly to many types of surfaces under water. Effective use such proteins, for instance the Mytilus edulis foot protein - Mefp-1, for surface modification requires achievement of a large adsorbed amount and formation of a layer that is resistant towards desorption under changing conditions. In this work we compare the adsorbed amount and layer properties obtained by using a sample containing small Mefp-1 aggregates with that obtained by using a non-aggregated sample. We find that the use of the sample containing small aggregates leads to higher adsorbed amount, larger layer thickness and similar water content compared to what can be achieved with a non-aggregated sample. The layer formed by the aggregated Mefp-1 was, after removal of the protein from bulk solution, exposed to aqueous solutions with high ionic strength (up to 1 M NaCl) and to solutions with low pH in order to reduce the electrostatic surface affinity. It was found that the preadsorbed Mefp-1 layer under all conditions explored was significantly more resistant towards desorption than a layer built by a synthetic cationic polyelectrolyte with similar charge density. These results suggest that the non-electrostatic surface affinity for Mefp-1 is larger than for the cationic polyelectrolyte.

Place, publisher, year, edition, pages
2013. Vol. 408, 82-86 p.
Keyword [en]
Mussel adhesive protein, Aggregation, Mefp-1, Desorption, Adsorption, Dual polarization interferometry
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-129435DOI: 10.1016/j.jcis.2013.07.015ISI: 000323989900012Scopus ID: 2-s2.0-84885176888OAI: oai:DiVA.org:kth-129435DiVA: diva2:652924
Funder
Swedish Foundation for Strategic Research Swedish Research Council
Note

QC 20131002

Available from: 2013-10-02 Created: 2013-09-30 Last updated: 2017-12-06Bibliographically approved

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Dédinaité, Andra

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