Freeze-dried alginic acid preparation

Abstract

The present invention provides: a freeze-dried composition which comprises (a) a monovalent metal alginate and (b) a salt selected from a monovalent metal salt and an ammonium salt; and a method of producing a freeze-dried monovalent metal alginate composition which comprises the steps of freezing an aqueous solution formed by dissolving at least the component (a) and the component (b), performing first drying, and then performing second drying as desired to reduce a water content to 3% by mass or less. This is a freeze-dried monovalent metal alginate composition with suppressed viscosity decrease with the lapse of time.

What is claimed is: 
     
         1 . A suppressant of viscosity decrease with the lapse of time for a freeze-dried monovalent metal alginate composition, comprising a salt selected from a monovalent metal salt and an ammonium salt, wherein the freeze-dried composition can be dissolved using an injection water and/or a physiological saline.