Development of alginate hydrogels active against adhesion of microalgae

Type Article
Date 2019-03
Language English
Author(s) Nassif L. Abi1, 2, Rioual S.1, Trepos RozennORCID3, Fauchon M.3, Farah W.2, Hellio C.3, Abboud M.2, Lescop B.1
Affiliation(s) 1 : Univ Bretagne Occidentale, Lab STICC, CNRS, UMR 6285, 6 Av Le Gorgeu, F-29285 Brest, France.
2 : Univ St Joseph, Fac Sci, UEGP, Beirut, Lebanon.
3 : Univ Bretagne Occidentale, LEMAR, BIODIMAR, UMR 6539, 6 Av Le Gorgeu, F-29285 Brest, France.
Source Materials Letters (0167-577X) (Elsevier Science Bv), 2019-03 , Vol. 239 , P. 180-183
DOI 10.1016/j.matlet.2018.12.106
WOS© Times Cited 9
Keyword(s) Biofilm, Adhesion, Alginate, Zinc, Biomaterials, Microalgae

Microorganisms have the ability to settle on nearly all man-made surfaces in contact with seawater and subsequently to form biofilm. Biofilms control and removal is necessary in the sectors of maritime transport, energy... In this work, we present the development of new pure calcium, zinc or copper alginate, but also mixed Ca/Cu and Ca/Zn alginate hydrogels. These materials have been evaluated for their potential inhibition of adhesion of two key biofilm-forming microalgae Halamphora coffeaeformis and Cylindrotheca closterium). All the tested materials have presented high adhesion inhibition about 80%). Copper-base materials present a high toxicity against H. coffeaeformis. Pure zinc alginate is also toxic for this strain. However, the addition of calcium in zinc alginate leads to the toxicity reduction. The toxicity of these materials differs according to the strains. Consequently, mixed zinc/calcium alginate are efficient at inhibiting microalgal adhesion with a low level of cells toxicity. These alginate hydrogels are promising materials because they are efficient, cheap, easy to develop and eco-friendly.

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