Drug – bio-affecting and body treating compositions – Inorganic active ingredient containing – Peroxide or compositions of or releasing gaseous oxygen or...
Reexamination Certificate
1998-11-18
2001-12-04
Pak, John (Department: 1616)
Drug, bio-affecting and body treating compositions
Inorganic active ingredient containing
Peroxide or compositions of or releasing gaseous oxygen or...
C514S557000, C514S558000, C514S559000, C514S560000, C514S574000, C514S714000, C422S028000, C422S029000, C426S335000, C426S532000, C252S186230
Reexamination Certificate
active
06326032
ABSTRACT:
FIELD OF THE INVENTION
The invention relates generally to processes using antimicrobial or biocidal compositions. More particularly, the invention relates to peroxyacid antimicrobial concentrates and use solutions which can sanitize various surfaces such as facilities, containers or equipment found in the food or beverage processing in food service industries at or near ambient temperatures.
BACKGROUND OF THE INVENTION
Numerous classes of chemical compounds exhibit varying degrees of antimicrobial or biocidal activity. Antimicrobial compositions are particularly needed in the food and beverage industries to clean and sanitize processing facilities such as pipelines, tanks, mixers, etc. and continuously operating homogenation or pasteurization apparatus. Sanitizing compositions have been formulated in the past to combat microbial growth in such facilities. For example, Grosse-Böwing, U.S. Pat. Nos. 4,051,058 and 4,051,059 teaches peracetic acid materials. These peroxy-containing compositions are known for use in the production of microbicidal agents. One such composition is disclosed in Grosse-Böwing et al. contains peracetic acid, acetic acid or mixtures of peracetic and acetic acid, hydrogen peroxide, anionic surface active compounds such as sulfonates and sulfates, and water. Wang, U.S. Pat. No. 4,404,040, teaches a short chain fatty acid sanitizing composition comprising an aliphatic short chain fatty acid, a hydrotrope solubilizer capable of solubilizing the fatty acid in both the concentrate and use solution, and a hydrotrope compatible acid so that the use solution has a pH in the range of 2.0 to 5.0.
Peracetic acid has been shown to be a good biocide, but only at fairly high concentrations (generally greater than 100 part per million (ppm)). Similarly, peroxyfatty acids have also been shown to be biocidal, but only at high concentrations (greater than 200 ppm), such as in the composition disclosed in European Patent Application No. 233,731. Antimicrobial compositions having low use concentrations (less than 100 ppm) which effectively kill microbes are particularly desirable. Low concentrations minimize use cost, surface corrosion, odor, carryover of biocide into foods and potential toxic effects to the user. Therefore, a continuing need exists to provide such an antimicrobial composition for use in food processing, food service and health care facilities. In contrast to the prior art, the composition of the present invention has the unique advantage of having antimicrobial or biocidal activity at low level use concentrations.
SUMMARY OF THE INVENTION
The invention is a peroxyacid antimicrobial concentrate and diluted end use composition comprising an effective microbicidal amount of a C
1
-C
4
peroxycarboxylic acid or an effective microbicidal amount of a C
1
-C
4
peroxycarboxylic acid combined with an effective microbicidal amount of a C
6
-C
18
peroxyacid. The concentrate composition can be diluted with a major proportion of water to form an antimicrobial sanitizing use solution having a pH in the range of about 2 to 8, with a C
1
-C
4
peroxycarboxylic acid concentration of at least about 10 ppm, preferably about 10 to 75 ppm, and a C
6
-C
18
peroxyacid concentration of at least about 1 ppm, preferably about 1 to 25 ppm. Other components may be added such as a hydrotrope coupling agent for solubilizing the peroxyfatty acid in the concentrate form and when the concentrate composition is diluted with water. In contrast to the prior art, we have discovered that at a low pH, (e.g. preferably less than 5) C
6
-C
18
peroxyacids such as peroxyfatty acids are very potent biocides at low levels. When used in combination with a C
1
-C
4
peroxycarboxylic acid such as peroxyacetic acid, a synergistic effect is obtained, providing a much more potent biocide than can be obtained by using these components separately. This means that substantially lower concentrations of biocide can be used to obtain equal biocidal effects, leading to lower costs of the product and less potential for corrosion. As the term is used herein, a C
6
-C
18
peroxyacid (or peracid) is intended to mean the product of the oxidation of a C
6
-C
18
acid such as a fatty acid, or a mixture of acids, to form a peroxyacid having from about 6 to 18 carbon atoms per molecule. The C
1
-C
4
peroxycarboxylic acid is intended to mean the product of oxidation of a C
1
-C
4
carboxylic acid, or a mixture thereof. This includes both simple and substituted C
1
-C
4
carboxylic acids.
A method of sanitizing facilities or equipment comprises the steps of contacting the facilities or equipment with the use solution made from the above concentrate composition of the invention at a temperature in the range of about 0° C. to 80° C., preferably 20° C. to 40° C. and often at ambient or room temperature conditions. The composition is then circulated or left in contact with the container, facilities or equipment for a time sufficient to sanitize (generally at least 30 seconds) and the composition is thereafter drained or removed from the container, facilities or equipment. We have found that the methods of the invention are capable of killing a variety of microorganisms including bacteria, yeast and mold. In particular the methods are surprisingly effective for aseptic cold filling of beverage containers. The compositions are effective against either fungal genus, Chaetomium or Arthrinium, that are a problem in bottling operations.
One aspect of the invention is the novel, antimicrobial concentrate composition which is capable of being diluted with a major proportion of water to form a sanitizing use solution. A further aspect of the invention is an aqueous antimicrobial sanitizing use solution which is particularly suited for “in-place” cleaning applications. A further aspect of the invention is a method of employing the use solution of the invention in the cleaning or sanitizing of various process facilities or equipment as well as other surfaces.
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Besse Michael E.
Cords Bruce R.
Nogami Kenji
Richter Francis L.
Ecolab Inc.
Merchant & Gould P.C.
Pak John
LandOfFree
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