Sodium Carbonate → Chromium Arabinose Carbonate

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30 g of arabinose and 7 g of chromium chloride hexahydrate were dissolved in 60 g of water at 75° C. with stirring to produce a solution. The pH of the solution was raised to about 4 by adding an aqueous solution containing 20 wt % of sodium carbonate. The pH of the solution was then further raised to 10 by rapidly in one portion a suitable amount of adding an aqueous solution containing 20 wt % of sodium hydroxide. The temperature was then raised to 90° C. In less than 10 minutes after the temperature reached 90° C., a blue transparent solution having a strong laser scattering characteristic was then obtained. This strong laser scattering property indicated formation of chromium arabinose nanoclusters. Ethanol was then added into the solution to precipitate the nanoclusters. Next, the precipitate was collected by filtration and then dried alone. Atomic absorption spectroscopy of the thus-obtained nanoclusters indicated that the nanoclusters had a chromium cont of 5.85%. Or the alcohol precipitate was mixed with mannitol and co-dried for further formulation use.

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