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Gothenburg Researchers Develop Coatings that Prevent Barnacles from Forming Colonies

Published on 2011-10-10. Author : SpecialChem

It is not necessary for an effective anti-fouling coating to release toxins into the environment. Scientists at the University of Gothenburg have shown that it is instead possible to mix into the coating molecules on which the adult barnacles cannot grow. The result has been published in the scientific journal Biofouling.

Fouling of hulls is a problem for all boat owners, and one of the most difficult organisms to deal with is barnacles. A research group at the Department of Cell and Molecular Biology has therefore studied the biology of barnacles in detail, and focussed on one particularly sensitive stage in the barnacle life cycle.

"When newly matured adult barnacles attempt to penetrate through the coating in order to establish a fixed location to grow, they are extremely sensitive to certain molecules known as 'macrocyclic lactones', which are normally produced by certain bacteria," says Professor Hans-Björne Elwing of the Department of Cell and Molecular Biology at the University of Gothenburg.

A better effect when no toxin is released to the environment

When such molecules are mixed into the anti-fouling coating, the treated surface is first colonised by barnacles in the normal way. But as soon as the young barnacles have matured into adults and attempt to establish stronger contact with the surface, they lose contact and probably die. It is also the case that certain brown algae counteract the colonisation by barnacles on the surfaces of leaves in a similar manner.

"Using this discovery, we have managed to create coatings with new binding agents that shut down the release of the macrocyclic lactones into the marine environment. Further, only trace amounts of the macrocyclic lactones are required in the coating to give full effect against barnacles."

The research group has shown through field trials on leisure craft that the addition of macrocyclic lactones can fully replace copper in coatings used on such craft, on both the eastern and the western coasts of Sweden, and for several seasons.

"While it is true that it is only barnacles that are affected by the additive, the growth of algae and similar organisms can be counteracted relatively simply by other methods."

The study has been carried out by Emiliano Pinori, Mattias Berglin, Mats Hulander, Mia Dahlström and Hans Elwing at the University of Gothenburg, in collaboration with Lena Brive at the SP Technical Research Institute of Sweden in Borås. The article Multi-seasonal barnacle (Balanus improvisus) protection achieved by trace amounts of a macrocyclic lactone (ivermectin) included in rosin-based coatings has been published in the journal Biofouling.

About the University of Gothenburg

The University of Gothenburg has approximately 39,000 students and 5,000 employees. It is one of the major universities in northern Europe. They are also one of the most popular universities in Sweden - the University of Gothenburg has the highest number of applicants to many programmes and courses.

The University's roughly 40 different Departments cover most scientific disciplines, making it one of Sweden's broadest and most wide-ranging higher education institutions.

In an international perspective too, the University of Gothenburg is unusually comprehensive, with cutting-edge research in a number of dynamic research areas. Cooperation with Chalmers University of Technology, Sahlgrenska University Hospital, society at large and trade and industry has been consistently strengthened and intensified over recent years, as have international contacts and collaborative projects with partners abroad.

Source: University of Gothenburg


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