Crystal of reduced glutathione and method for producing same

Abstract

The present invention provides a crystal of reduced glutathione having excellent powder properties and a method for producing the same. The present invention relates to a crystal of reduced glutathione, wherein the average crystal thickness is 10 μm or more.

1 . A method for producing a crystal of reduced glutathione, comprising allowing a crystal of reduced glutathione to exist in an aqueous solution containing reduced glutathione, and then adding continuously or dividedly an aqueous solution containing reduced glutathione in a supersaturated state to the aqueous solution, thereby precipitating and/or growing a crystal of reduced glutathione, and thereafter collecting the crystal of reduced glutathione contained in the aqueous solution. 
     
     
         2 . The production method according to  claim 1 , further comprising a step of pulverizing the collected crystal of reduced glutathione. 
     
     
         3 . The production method according to  claim 2 , wherein the crystal of reduced glutathione is an α crystal. 
     
     
         4 . The production method according to  claim 1  wherein the crystal of reduced glutathione is an α crystal.