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ARTÍCULO
TITULO

Marine Archaeal Extracellular Polymeric Substances from Halococcus AMS12, Their Characterization, and Biological Properties

Kamala Kannan    
Sivaperumal Pitchiah    
Jeevankumar Guduri Joseph    
Dhanraj Ganapathy    
Subramanian Sundarrajan and Seeram Ramakrishna    

Resumen

In the present study, halophilic archaea were isolated from a marine sediment sample. Totally, 15 isolates (AMS 1?15) were identified by molecular identification as belonging to the ten genera. Further, their extracellular polymeric substances (EPS) were extracted (3.172 g/L), and their bioactivity was determined in terms of biosurfactant, emulsification, enzymatic and non-enzymatic antioxidants, and anticancer activity. The highest amount of EPS has been produced by Halococcus sp., AMS12. It is made up of 54.28% carbohydrates, 32.91% proteins, 2.41% lipids, and other compounds. Further, EPS has 43.69 ± 1.89 U/mg of gelatinase enzyme by degrading the substrate. The potential total antioxidant activity of 103.80 ± 0.02 (ascorbic acid equivalence (AAE)), total reducing power of 86.1 ± 0.25 AAE, 1,1-diphenyl-2-picrylhydrazyl (DPPH) activity of 97.23 ± 0.21%, the hydrogen peroxide scavenging of 60.8 ± 0.21%, and nitric oxide scavenging activity of 89.37 ± 0.24% were observed at 100 µg/mL of EPS. Hence, we conclude that the archeal EPS is multifunctional and useful for developing natural polymers for industrial, food, and pharmaceutical applications.

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