The invention relates to certain low molecular weight sulphated polysaccharide derivatives of {TAIL ~ marine native exopolysaccharides} excreted by mesophilic marine bacteria from a deep hydrothermal environment, wherein said derivatives can be obtained by {HEAD ~ 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 certain low molecular weight sulphated polysaccharide derivatives of { TAIL ~ marine native exopolysaccharides } excreted by mesophilic marine bacteria from a deep hydrothermal environment , wherein said derivatives can be obtained by { HEAD ~ 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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