WATER-SOLUBLE SOYBEAN POLYSACCHARIDES AND MANUFACTURING PROCESS THEREFOR
[Problem] The purpose of the present invention is to provide a natural polymeric emulsifier improved in so-called “emulsifying power”, said natural polymeric emulsifier being capable of forming, even by the addition thereof in a small amount, an oil-in-water emulsion which has a small emulsified particle diameter and a uniform particle size distribution and which rarely suffers from the aggregation or coalescence of emulsified particles even when has undergone heating, long-term storage, aging or the like. [Solution] The purpose can be achieved by using water-soluble soybean polysaccharides which have a methyl ester content of 30% or below relative to the uronic acids and an acetate content of 1 wt % or higher in terms of free acetic acid and relative to the water-soluble soybean polysaccharides. The water-soluble soybean polysaccharides can be manufactured by subjecting raw material water-soluble soybean polysaccharides to methyl ester removal treatment and thereafter acetate-forming esterification treatment.
1 . A water-soluble soybean polysaccharide comprising 30% or less of methyl ester content relative to uronic acid and 1 wt % or more of acetic acid ester content relative to the water-soluble soybean polysaccharide in terms of free acetic acid.
2 . A process for producing the water-soluble soybean polysaccharide according to claim 1 , comprising subjecting acetic acid esterification treatment to water-soluble soybean polysaccharide which is subjected to de-methylesterification treatment.
3 . An emulsifier comprising the water-soluble soybean polysaccharide according to claim 1 as an active ingredient.
4 . An oil-in-water emulsion obtained by using the emulsifier according to claim 3 to stabilizing dispersion of hydrophobic material to hydrophilic solvent.
5 . The oil-in-water emulsion according to claim 4 , wherein 0.3 part by weight or more and 7 parts by weight or less of the emulsifier is used to 1 part by weight of hydrophobic material.
6 . A use of the water-soluble soybean polysaccharide according to claim 1 for preparing an emulsifier.
7 . A use of the water-soluble soybean polysaccharide according to claim 1 for preparing an emulsion.