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Isolation and characterization of halophilic bacteria producing exopolymers with emulsifuing and antioxidant activities

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Manresa Presas, Ma. Ángeles (María Ángeles)

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Halophilic bacteria are considered a great source of new strains producing novel exopolymers with functional properties. In this work we isolated ten halophilic strains producing exopolymers from different hypersaline environments in Morocco. Phenotypic characterization showed that the strains were moderately halophilic, mesophilic and neutrophilic with the ability to produce some hydrolytic enzymes. Strains identification based on 16S rRNA gene sequences comparison showed that nine strains, designed as N1, N2, N5, N7, N8, N9, N10, N11 and N12 belong to Halomonas genus and one strain, designed as N4, to Marinobacter genus. The majority of the strains showed high levels of exopolymer production. The study of emulsifying and antioxidant activities revealed that all the polymers have an interesting emulsifying and antioxidant activities with the polymer from Marinobacter sp. N4 forming the highest and most stable emulsions and exhibiting the best antioxidant activity in comparison with other exopolymers produced by Halomonas strains. The obtained results demonstrate the great potential of exopolymers from halophilic bacteria to be applied as emulsifying and antioxidant agents in food, cosmetics and oil industries.

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Biocatalysis and Agricultural Biotechnology, 2018, vol. 16, p. 631-637

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Articles publicats en revistes (Biologia, Sanitat i Medi Ambient)

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Isolation and characterization of halophilic bacteria producing exopolymers with emulsifuing and antioxidant activities