SIALIC ACID POWDER AND PROCESS FOR THE PREPARATION THEREOF

摘要

An amorphous sialic acid powder is disclosed. It is prepared by rapidly freezing an aqueous solution of sialic acids and freeze-drying the frozen product. It has a melting point of 131-136.degree.C (decomposed) and exhibits no peaks inherent to crystals in differential scanning thermal analysis (at 165-200.degree.C) and Xray diffractiometric pattern (in the range of 5.degree. The amorphous sialic acid powder is highly reactive and can be used as a raw material for drugs and the like.