C - Chemistry – Metallurgy – 07 – F
Patent
C - Chemistry, Metallurgy
07
F
167/13.1, 260/42
C07F 1/08 (2006.01)
Patent
CA 1099732
Abstract of the Disclosure Antimicrobial agents are disclosed containing as the active ingredient a metal complex of a metal ion and a poly- functional organic ligand. The antimicrobial metal complexes are characterized by a very unexpected aqueous proton induced dis- sociation property which causes the controlled rel??se of toxic metal ion at a p? compatible with microorganism growth. This dis- sociation property is represented by a sigmoidally shaped curve, i.e., one curved in two different directions like the letter "S", on a cartesian coordinate plot of the negative logarithm (log) of metal ion concentration versus the negative logarithm (log) of hydrogen ion concentration for otherwise known as a pM-pH dia- gram). Antimicrobial metal complexes are also disclosed which are extremely effective in the controlled release of metal ion from the complex in about the normal range of physiological pH, i.e., about 10-4 to 10-9 moles of hydrogen ion per liter. The antimicrobial agents act as microbiocides and bacteriostats for microorganisms including, bacteria, fungi and viruses. Metal complex agents are disclosed which possess excellent stability at high alkaline pH on the order of about 9 to about 12 and, therefore, such agents are very advantageously employed in such media to effect, upon demand, the antimicrobial activity. Aqueous solutions of monocopper(II) citrate complexes have been found particularly effective in the inhibition of microorganism growth or destruction of microorganisms. Dialkali metal salts of monocopper(II) citrates have been isolated in solid form, such salts possessing extremely high solubility in water or other aqueous media permitting preparation of high concentrations of the monocopper(II) complex for superior biocidal action in aqueous media.
284786
Maurer Gerald L.
Shringarpurey Sudhir K.
Macrae & Co.
National Research Laboratories (a Partnership)
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