Method for preparing compositions comprising: (i) D-galacturonic acid derivatives of formula: in which - R 1 is a linear or branched, saturated or unsaturated chain of 2 to 22 carbon atoms; - R is C H-CH -CO 2 R 2 or C H -CH-CO 2 R 2, in which the carbon not bearing the hydroxyl group is bonded to the endocyclic oxygen atom; - R 2 is a hydrogen, R 1, an alkali metal atom, an alkaline earth metal atom or a quaternary ammonium group of formula: in which each of R 3 to R 6 is independently a hydrogen atom, an alkyl having from 1 to 6 carbon atoms or a hydroxyalkyl having from 1 to 6 carbon atoms; and (ii) from 5 to 30% by weight of alkyl glycosides derived from neutral sugars; and characterized in that said one pot method comprises: a) a step of complete acid hydrolysis of a pectin; b) a step of esterification and glycosylation of the hydrolyzate resulting from step a) with a linear or branched, saturated or unsaturated alcohol of formula R'OH having from 1 to 4 carbon atoms; c) a step of transesterification and transglycosylation of the alkyl(alkyl galactosid)uronate resulting from step b) with a linear or branched, saturated or unsaturated alcohol of formula R"OH having from 2 to 22 carbon atoms in which R" is R 1; d) and optionally a step of saponification of the ester resulting from step c). (i) D-galacturonic acid derivatives of formula: in which - R 1 is a linear or branched, saturated or unsaturated chain of 2 to 22 carbon atoms; - R is C H-CH -CO 2 R 2 or C H -CH-CO 2 R 2, in which the carbon not bearing the hydroxyl group is bonded to the endocyclic oxygen atom; - R 2 is a hydrogen, R 1, an alkali metal atom, an alkaline earth metal atom or a quaternary ammonium group of formula: in which each of R 3 to R 6 is independently a hydrogen atom, an alkyl having from 1 to 6 carbon atoms or a hydroxyalkyl having from 1 to 6 carbon atoms; and - R 1 is a linear or branched, saturated or unsaturated chain of 2 to 22 carbon atoms; - R is C H-CH -CO 2 R 2 or C H -CH-CO 2 R 2, in which the carbon not bearing the hydroxyl group is bonded to the endocyclic oxygen atom; - R 2 is a hydrogen, R 1, an alkali metal atom, an alkaline earth metal atom or a quaternary ammonium group of formula: in which each of R 3 to R 6 is independently a hydrogen atom, an alkyl having from 1 to 6 carbon atoms or a hydroxyalkyl having from 1 to 6 carbon atoms; and (ii) from 5 to 30% by weight of alkyl glycosides derived from neutral sugars; and characterized in that said one pot method comprises: a) a step of complete acid hydrolysis of a pectin; b) a step of esterification and glycosylation of the hydrolyzate resulting from step a) with a linear or branched, saturated or unsaturated alcohol of formula R'OH having from 1 to 4 carbon atoms; c) a step of transesterification and transglycosylation of the alkyl(alkyl galactosid)uronate resulting from step b) with a linear or branched, saturated or unsaturated alcohol of formula R"OH having from 2 to 22 carbon atoms in which R" is R 1; d) and optionally a step of saponification of the ester resulting from step c). a) a step of complete acid hydrolysis of a pectin; b) a step of esterification and glycosylation of the hydrolyzate resulting from step a) with a linear or branched, saturated or unsaturated alcohol of formula R'OH having from 1 to 4 carbon atoms; c) a step of transesterification and transglycosylation of the alkyl(alkyl galactosid)uronate resulting from step b) with a linear or branched, saturated or unsaturated alcohol of formula R"OH having from 2 to 22 carbon atoms in which R" is R 1; d) and optionally a step of saponification of the ester resulting from step c).