Disodium glutamate → Zinc L-glutamate Dihydrate

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Basically the reaction conditions found for preparation of strontium L-glutamate (Example 8) was employed. A suspension of sodium glutamate (white coloured) is prepared by adding 100 mL of millipore water to 18.714 g (0.1 moles) of solid L-glutamic acid monosodium salt monohydrate (ALDRICH G2834, MW 187.14, CAS 142-47-2) in a 250 mL beaker. To this suspension was added 13.628 g (0.1 moles) of solid zinc chloride (FLUKA, 96469, MW 136.28, CAS 7646-85-7). The reactants were placed in the sealed container in an autoclave, and temperature was increased to 132° C. for 15 min whereafter the reaction was stopped and after the reaction mixture reached a temperature of 92-98° C., it was filtered on a Büchner funnel, and the desired zinc L-glutamate salt readily precipitated from the filtrate. The yield was approximately 95% and purity higher than 96%.

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