It is yellow or orange -yellow crystalline powder,a litte bitter, a litter odor. It very slightly dissolves in water and practically insoluble in alcohol,easily dissolves in NaOH solution.</P><P> </P><P> <BR> the standard of VB2 by USP30 <BR> Loss on drying 1.5max <BR> Residue on ignition. 0.max <BR> Specific rotation.?° -115~-135 <BR> Lumiflavine, 0.025max <BR> Assay, 98~103</P><P>
