The present invention relates to a method of increasing di-complex content in a preparative reaction wherein the fructoborate complexes are a mixture of di-complexes and mono complexes, the method comprising: selecting a molar ratio between a fructose and boric acid of about 2:1； contacting the fructose and boric acid in an aqueous solution at the molar ratio to generate a liquid intermediate comprising fructoborate di-complexes and borate； and removing water from the liquid intermediate to generate a dry product comprising fructoborate di-complexes and borate, wherein the ratio of sodium fructoborate di-complexes to borate in the dry product is increased by at least about 13% relative to the ratio of sodium fructoborate di-complexes to borate in the liquid intermediate.
