Process for producing a sugar derivative, modified polysaccharide derivatives and modified saccharides derivative composition

The object of the present invention is regioselectively can hydrolyze sugars substituents, it is to provide a method for producing a low cost mass production can saccharide derivatives. Further, by modifying the sugar derivative, it is to provide novel modified saccharide derivative in water resistance. The method of producing a saccharide derivative of the present invention, the presence of a compound having the structure represented by the general formula (1), that the saccharides having a hydrolyzable substituent two or more hydrolyzed to produce saccharide derivative the features. The general formula (1): (W) m (Y) n (In Formula (1), W is .m and n .Y represents a counter ion ionic radius represents the ions within the 1.5~2.0A represent each independently an integer of 1 or more .)