A surfactant composition comprising a mixture M1 constituted by oligomers with formula: R1-O-(ISO-PDO X) N -ISO X' -OR2 - in which -O-(ISO-PDO X) N -ISO X' -O- represents an oligoether comprising at least one residue of a 1,3-propanediol monomer and at least one residue of an isosorbide monomer, - R1 and R2 being a hydrogen atom or a R3C(=O)- group, - R1 and R2 being identical or different, - R3 being a carbon chain containing between 7 and 21 carbon atoms, which may be saturated or unsaturated, linear or branched, - x being an average number in the range between 1 and 5, - x' being an average number in the range between 0 and 1, - N being an average number between 1 and 5, each oligomer with formula having an ISO/PDO molar ratio in the range 20/80 to 50/50 and a molar mass of less than or equal to 1500 g.mol -1, the mixture M1 comprising at least 25% by weight of at least one oligomer with formula for which at least one of the groups R1 or R2 is a group R3C(=O)-, the surface composition comprising, with respect to the mass of the mixture M1, less than 10% by weight of a compound with formula: the surfactant composition being prepared in accordance with at least one of the following steps: a) preparation of a composition A comprising a mixture of oligoethers by polyetherification of 1,3-propanediol and isosorbide, the initial ISO/PDO molar ratio being in the range 40/60 to 70/30 b) purification of the composition A by molecular distillation in order to obtain a composition B comprising less than 4% by weight of isosorbide which has not been polyetherified, with respect to the mass of the composition B, c) esterification, advantageously by an enzymatic pathway, of the oligoethers of the composition B with at least one carboxylic acid with formula R3C(=O)OH, R3 being a carbon chain containing between 7 and 21 carbon atoms which may be saturated or unsaturated, linear or branched. - in which -O-(ISO-PDO X) N -ISO X' -O- represents an oligoether comprising at least one residue of a 1,3-propanediol monomer and at least one residue of an isosorbide monomer, - R1 and R2 being a hydrogen atom or a R3C(=O)- group, - R1 and R2 being identical or different, - R3 being a carbon chain containing between 7 and 21 carbon atoms, which may be saturated or unsaturated, linear or branched, - x being an average number in the range between 1 and 5, - x' being an average number in the range between 0 and 1, - N being an average number between 1 and 5, each oligomer with formula having an ISO/PDO molar ratio in the range 20/80 to 50/50 and a molar mass of less than or equal to 1500 g.mol -1, the mixture M1 comprising at least 25% by weight of at least one oligomer with formula for which at least one of the groups R1 or R2 is a group R3C(=O)-, the surface composition comprising, with respect to the mass of the mixture M1, less than 10% by weight of a compound with formula: the surfactant composition being prepared in accordance with at least one of the following steps: a) preparation of a composition A comprising a mixture of oligoethers by polyetherification of 1,3-propanediol and isosorbide, the initial ISO/PDO molar ratio being in the range 40/60 to 70/30 b) purification of the composition A by molecular distillation in order to obtain a composition B comprising less than 4% by weight of isosorbide which has not been polyetherified, with respect to the mass of the composition B, c) esterification, advantageously by an enzymatic pathway, of the oligoethers of the composition B with at least one carboxylic acid with formula R3C(=O)OH, R3 being a carbon chain containing between 7 and 21 carbon atoms which may be saturated or unsaturated, linear or branched. a) preparation of a composition A comprising a mixture of oligoethers by polyetherification of 1,3-propanediol and isosorbide, the initial ISO/PDO molar ratio being in the range 40/60 to 70/30 b) purification of the composition A by molecular distillation in order to obtain a composition B comprising less than 4% by weight of isosorbide which has not been polyetherified, with respect to the mass of the composition B, c) esterification, advantageously by an enzymatic pathway, of the oligoethers of the composition B with at least one carboxylic acid with formula R3C(=O)OH, R3 being a carbon chain containing between 7 and 21 carbon atoms which may be saturated or unsaturated, linear or branched.