Potential valorization of polymeric substances excreted by Chaetomorpha aerea, a macro-algae harmful to French oyster industry

Abstract : The in vitro antimicrobial activity of the marine green algae Chaetomorpha aerea was investigated against gram-positive bacteria, gram-negative bacteria, and a fungus. The water-soluble extract of algae was composed of a sulfated (6.3%) galactan with a molecular weight of 1.160x106 Da and a global composition close to commercial polysaccharides as dextran sulfate or fucoidan. The polysaccharide was composed of 18% arabinose, 24% glucose, 58% galactose. The re-suspended extracts (methanol, water) exhibited selective antibacterial activities against three gram-positive bacteria including Staphylococcus aureus (ATCC 25923). Minimum inhibitory concentration and minimum bactericidal concentration tests showed that the sulfated galactan could be a bactericidal agent for this strain (40mg.mL-1). Results of the present study confirmed the potential use of the green algae Chaetomorpha aerea as a source of antibacterial compounds or active known molecules.
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https://hal.archives-ouvertes.fr/hal-00652073
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Submitted on : Thursday, December 15, 2011 - 12:05:38 PM
Last modification on : Thursday, January 11, 2018 - 6:23:34 AM
Long-term archiving on: Friday, March 16, 2012 - 2:21:49 AM

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Guillaume Pierre, Valérie Sopena, Camille Juin, Amira Mastouri, Marianne Graber, et al.. Potential valorization of polymeric substances excreted by Chaetomorpha aerea, a macro-algae harmful to French oyster industry. Biotechnology and Bioprocess Engineering, 2011, 16, pp.937-945. ⟨hal-00652073⟩

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