[O:1]=[C:2]1[O:8][C@H]([C@H](CO)O)C(O)=[C:3]1O.[NH2:13][C@H:14]([C:22]([OH:24])=[O:23])[CH2:15][CH2:16][CH2:17][NH:18]C(=N)N.C(O)(=O)C>O.S([O-])([O-])(=O)=O.[Mn+2].O>[C:2]([OH:8])(=[O:1])[CH3:3].[NH2:13][C@H:14]([C:22]([OH:24])=[O:23])[CH2:15][CH2:16][CH2:17][NH2:18]42.3 mg manganese sulfate hydrate (2.5×10-4 molar), 21.8 mg ascorbic acid (1.25×10-4 molar) and 15000 units calf's liver arginase of the Boehringer Mannheim company were added to 1 liter of a 0.75 molar L-arginine solution. After 48 hours the conversion was 100% according to HPLC. The mixture was adjusted with acetic acid to pH 6.8, three quarters of the water drawn off and the ornithine acetate precipitated with one liter ethanol at room temperature. After 15 min. of postagitation the precipitate was filtered off, postwashed with ethanol and dried in a vacuum (40 mbars). The yield of pure ornithine acetate was 137.0 g, 95% of theory). Amount of rotation (c=5 in water)+10.0° (theoretical: +9.0 to +11.0).
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