The invention relates to {HEAD ~ certain low molecular weight} sulphated {TAIL ~ polysaccharide derivatives} of marine native exopolysaccharides excreted by mesophilic marine bacteria from a deep hydrothermal environment, wherein said derivatives can be obtained by means of a method which comprises a step of free radical depolymerisation of said native EPSs followed by a step of sulphating the resulting depolymerised derivatives 
The invention relates to { HEAD ~ certain low molecular weight } sulphated { TAIL ~ polysaccharide derivatives } of marine native exopolysaccharides excreted by mesophilic marine bacteria from a deep hydrothermal environment , wherein said derivatives can be obtained by means of a method which comprises a step of free radical depolymerisation of said native EPSs followed by a step of sulphating the resulting depolymerised derivatives
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