Chemically-active aqueous solution and solid substance containin

Details Chemically-active aqueous solution and solid substance containin Chemically-active aqueous solution and solid substance containin

1985-02-14

1988-05-17

Robinson, Douglas W.

Drug, bio-affecting and body treating compositions

Designated organic active ingredient containing

Heavy metal containing doai

47 58, 106 1505, 106 1811, 106 1826, 424147, 426335, 427 4, A01N 5502, A01N 5916, A01B 7900, A21D 400

Patent

active

047451297

DESCRIPTION:

BRIEF SUMMARY
DESCRIPTION

1. Technical Field
The present invention relates to a novel aqueous solution having various chemical effects such as deodorization, bactericidal action, preservation of freshness of foods, coagulation of pollutants, etc., and more specifically to an aqueous solution containing divalent iron ions in a stabilized state and a solid substance obtained by impregnating with the aqueous solution and then subjecting to a drying treatment.
2. Background Art
Iron (II) compounds such as ferrous sulfate have a wide variety of utility. However, when they are left over in the form of their aqueous solution, ferrous ions are, as well-known in the art, susceptible to ready oxidation by dissolved oxygen or air, whereby they turn to a yellowish brown color and result in the occurrence of a precipitate. It has been known to utilize hydroxylamine, a tin compound or the like as a reducing agent in order to avoid the oxidation of ferrous ions in aqueous solutions. These substances are however highly toxic to the human body, resulting in a limitation in the fields in which aqueous solutions containing divalent iron ions can be applied.
3. Disclosure of the Invention
An object of the present invention is to provide an aqueous solution containing stabilized divalent iron ions. Another object of this invention is to provide new uses for aqueous solutions containing stabilized divalent iron ions.
The present inventors have carried out a variety of investigations on the stabilization of divalent iron ions in aqueous solutions. As a result, it has been found that the addition of a small amount of L-ascorbic acid can unexpectedly stabilize dissolved divalent iron ions while maintaining their effective activities; that the aqueous solution containing the divalent iron ions stabilized by L-ascorbic acid exhibits, owing to a synergistic action of L-ascorbic acid and divalent iron ions, unique chemical activities unavailable from any aqueous solution which does not contain L-ascorbic acid but contains divalent iron ions, thereby providing an aqueous solution useful in a wide variety of fields; and that a solid substance obtained by impregnating a solid material with the aqueous solution and then by subjecting it to a drying treatment and containing L-ascorbic acid and an Iron(II) compound also has unique chemical activities similar to the aqueous solution, leading to the completion of the present invention.
The present invention provides a chemically-active aqueous solution characterized in that said aqueous solution contains divalent iron ions and L-ascorbic acid, the divalent iron ions are present at a concentration of 0.15 wt.% or higher as calculated in terms of metal iron in the aqueous solution, and the L-ascorbic acid is present in a proportion of 2.0 parts by weight or more per 100 parts by weight of the divalent iron ions are expressed in terms of metal iron.
The aqueous solution of present invention may be readily prepared by dissolving an iron(II) compound and L-ascorbic acid in water. As the iron(II) compound, any desired compound may be used so long as it can be dissolved in water to form divalent iron ions. For example, the water-soluble iron(II) salts of inorganic acids such as ferrous sulfate, ferrous chloride, ferrous bromide, ferrous iodide and ferrous nitrate and additionally, water-soluble iron(II) salts of organic acids such as ferrous gallate, ferrous malate and ferrous fumarate may be mentioned. The concentration of divalent iron ions in an aqueous solution is generally 0.15 wt.% or higher or preferably, 0.3 wt.% or higher as calculated in terms of the metal iron in view of the unique chemical activities of the aqueous solution. Its upper limit is the solubility of each iron (II) compound. L-ascorbic acid may be added in an amount or 2.0 parts by weight per 100 parts by weight of divalent iron ions, as expressed in terms of the metal iron in the aqueous solution. Although there is no particulsar limitation on its upper limit, it is desirable from an economical viewpoint to control it to below 30 parts by

REFERENCES:
patent: 1797572 (1931-03-01), Fulton et al.
patent: 2381487 (1945-08-01), Cook
patent: 2411636 (1946-11-01), Preiswerk
patent: 2822317 (1958-02-01), Gulesich et al.
patent: 3734742 (1973-05-01), Morse et al.
patent: 3829561 (1974-08-01), Heinrich
patent: 4070488 (1978-01-01), Davis
patent: 4110508 (1978-08-01), Isgur et al.
patent: 4268529 (1981-05-01), Davis
patent: 4384972 (1983-05-01), Nakamura et al.
Chem. Abst. 68 107859(t)(1968)--McCurdy et al.
Chem. Abst. 72:35796c (1970)--Bernath et al.
Chem. Abst. 73:7220n (1970)--Heinrich.
Chem. Abst. 76:131495g (1972)--Morse et al.
Chem. Abst. 95:202,374x(1981)--Florencio.
Chem. Abst. 90:96956z(1979), Maslow slea et al.
Chem. Ab. 55:889i (Lehman 1957).

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