Hydrochloric Acid → L-ornithine mercaptoethansulphonate

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The mercaptoethansulphonic acid coming out from the column, in aqueous solution, under nitrogen stream and at pH=1, is simultaneously added with the stoichiometrical amount of L-ornithine (0.64 g) freed from the hydrochloride through Kastel A 300 resin, in aqueous solution and under nitrogen stream. The addition is carried out at pH values of between 6 and 7. Upon the salification is completed the pH of the solution must be of between 5 and 6. The solution is concentrated to about dryness giving place to a colorless oil which is hot taken with 10 ml of 99% methanol. A conversion to white crystal takes place and the mixture is filtered and dried in oven under vacuum 1.117 g; yield 85%; m.p. 187°-192° C; the pH in 10% aqueous solution is 4.2 and solubility in water is perfect. The analysis gave the following results:

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