Title of Invention

METHOD OF STERILISATION, DISINFECTION, ASEPSIA OR DEPARASITISATION

Abstract The present invention discloses a method of sterilisation, disinfection, asepsia or deparasitisation that comprises the application of a composition comprising as active ingredient a di(C1-C20)alkyl ketone peroxide of formula (I): or a stereoisomer thereof, or a mixture thereof, in a percentage by volume comprised between an effective amount and 5%, wherein R1 and R2 represent independently a C1-C20 alkyl group, linear or branched, on medical and industrial instruments, on sanitary surfaces and premises, on surfaces in general, with the proviso that said surfaces are not animal or human surfaces, in industrial installations, refrigeration towers, air conditioning conduits, machinery and installations in the food industry, agriculture and fisheries installations, sanitary hot water circuits, in purification of drinking water for human or animal consumption.
Full Text METHOD OF STERILISATION, DISINFECTION,ASEPSIA OR DEPARASITISATION
FIELD OF THE INVENTION
The invention is related to novel biocidal agents, specifically with the use of
dialkyl ketone peroxide as a non-toxic, non-ecotoxic, sterilizing, antiseptic,
disinfecting and anti-parasitic agent, in all areas of use such as medicine, veterinary
sciences, industry, the home, etc. In particular, the invention contemplates the use
of dialkyl ketone peroxide as a sterilizing, antiseptic, disinfecting and anti-parasitic
agent, the use of sterilising, antiseptic, disinfectant or parasiticidal compositions
comprising said dialkyl ketone peroxide, and methods of sterilisation and
disinfection that involves the application of such compositions.
BACKGROUND OF THE INVENTION
For several years the techniques of sterilisation by physical or chemical
methods have become well known to experts in the field. Of the former, the
application of heat or radiation and the use of filters should be highlighted. Of the
latter, the use of chemical agents, either antiseptics or disinfectants, and/or
sterilising agents, stand out.
The application of humid heat, for example using an autoclave, is a widely
used method to destroy bacteria and spores in a short period of time, which does
not leave any toxic residues, does not deteriorate the exposed material and is
economical. However, it does present some inconveniences in as much as it does
not permit solutions forming emulsions with water to be sterilised, it is corrosive to
certain metallic instruments and damages instruments that are sensitive to heat,
especially if they contain certain polymeric materials.
The application of dry heat, using a sterilising oven or through incineration,
for example, is also used for disinfection, as it is not as corrosive to metallic
instruments and it permits the sterilisation of substances in powder and non-
aqueous material, as well as non-volatile viscous substances. However, this method
requires a longer sterilisation time with respect to the application humid heat and
furthermore, it still damages certain polymeric materials.
The application of ionising radiation is an economical method used to
sterilise thermolabile materials. However, it cannot be used for culture medium or
protein solutions because it produces alterations of their components. The
application of ultraviolet radiation (weakly penetrating) is used to sterilise surfaces.
In respect to sterilisation by filtration, using filter membranes with a
determined pore size is a method applied to oily emulsions or thermolabile
solutions. However, the filters that are generally used in laboratories do not retain
viruses or mycoplasms.
Among the chemical compounds employed, we find sterilising agents,
disinfectants and antiseptics. The effectiveness of these agents depends on their
concentration and pH, as well as on the time over which they are applied.
Among the antiseptic agents, the alcohols, iodine, ionic and amphoteric
agents, organo-mercurial compounds and some colorants should be mentioned.
The alcohols do not destroy spores and have a slow germicide activity.
Iodine, on the other hand is an oxidising agent that is used as a disinfectant of the
skin despite the fact that it is an irritant and is only effective as a sporicide at high
concentrations. The ionic and amphoteric agents are odourless antiseptics that do
not stain, they are not corrosive to metals and are non-toxic, as well as being stable
and cheap. However, they do not act as sporicides or tuberculicides, even at high
concentrations. The organo-mercurial compounds, are highly toxic. Hydrogen
peroxide is a mild antiseptic, with oxidising and free radical-producing capacity. It is
used in gaseous form as a disinfectant of surfaces or for the decontamination of
biological cabinets given that it does not posses the toxic and carcinogenic
properties of ethylene oxide and formaldehyde. Finally, certain colorants are also
used as antiseptics, such as acridine or derivatives of triphenylmethane.
Among the sterilising agents and/or disinfectants, chlorine and its
derivatives, aldehydes, phenolic compounds, and the ethylene oxide can be
mentioned.
Chlorine, hypochlorites and the chloramines are well known disinfectants in
the state of the art. The chlorinated product most used in disinfection is sodium
hypochlorite that is active against all bacteria, including spores, and is also effective
at a wide range of temperatures. The bactericidal activity of sodium hypochlorite is
due to the hypochlorous acid (HCIO) and to the Cl2 that is formed when the
hypochlorite is diluted in water. Its activity is influenced by the presence of organic
material since there may be substances capable of reacting with the chlorated
compounds in the medium that diminish their effective concentration and that form
organic compounds with carcinogenic properties. Furthermore, chlorine is an irritant
and is corrosive to certain materials.
The aldehydes are alkylating agents that are used as disinfectants and
sterilising agents, being sporicides. Glutaraldehyde is the only effective sterilising
agent at cold temperatures, but it is fairly toxic and is classified as carcinogenic.
Gaseous formaldehyde is used to decontaminate buildings, environments, etc.,
although it has the inconvenience of being a strong irritant and of losing activity in
refrigerated environments.
The phenolic compounds are commonly used disinfectants. Phenol is not
usually used as a disinfectant due to its unpleasant odour, because it is a strong
irritant and because of the residue that remains following the treatment of surfaces.
The most used phenol derivatives are hexachlorophene and the cresols that are
very effective at low concentrations against vegetative forms of bacteria, although
they are not effective against spores.
Similarly, ethylene oxide is a disinfectant agent used in gas sterilisation,
generally in the pharmaceutical industry. It serves to sterilise thermolabile material
but it is very dangerous due to the fact that it is highly inflammable and explosive,
as well as being carcinogenic.
In the case of infections by prion pathogenic agents, the cleansing,
disinfection and sterilisation of the floors and surfaces, or of surgical, hospital or
laboratory material, must be performed by chemical decontamination in sodium
hypochlorite (2% of free chlorine at room temperature during 1-2 hours) or in
sodium hydroxide (1-2 N for 1-2 hours), followed by steam sterilisation in an pre-
vacuum autoclave (a cycle at 134 °C during 18 minutes, or six cycles of 3 minutes
at 134 °C, for example).
Finally, in order to combat parasites and in particular, insects, mites and
arachnids, the current state of the art compounds are of very diverse nature, among
which those that should be highlighted: mineral arsenic, fluorinated, sulphur or
selenium compounds; compounds based on mineral oils such as anthracene and
petrol oils; vegetable compounds such as nicotine, pyrethrin or rotenone
derivatives; or synthetic organic compounds such as organophosphorated,
organochlorated or carbamate-type compounds. However, many of these have
ceased to be used due to their potential toxic effects.
Hence, there is still a need in the state of the art to produce sterilizing,
antiseptic, disinfecting and anti-parasitic agents that are not toxic and that as well as
acting on a wide spectrum of organisms, particularly micro-organisms including
spores, for a very wide range of applications of sterilisation, asepsia, disinfection
and deparasitisation of all types of surfaces, objects, areas or organisms.
The dialkylketone peroxides have been known for some time in the state of
the art. In particular, the methyl ethyl ketone peroxide is widely known for its
industrial use in polymerisation for the curing of unsaturated polyester resins (see
for example, the United States patent US 4,931,514, the United States patent
application US 2002/0137972 or the international patent application WO 9518180).
Likewise, it is known that methyl ethyl ketone peroxide is used in primer
compositions that are applied to substrates (metal, fibreglass, plastic, etc.) that will
be painted (see for example, the European patent application EP 1241233 A).
On the other hand, a composition has been described as a fuel additive that
includes a ketone peroxide, such as methyl ethyl ketone peroxide, acetone peroxide
or a mixture of both (see the United States patent application US 4,482,352).
Similarly, it is known that compositions including dialkyl ketone peroxide can
be used to conserve organic tissues. As such, in the European patent EP 0775439
compositions are described that contain (C1-C6) dialkyl ketone peroxides for the
conservation, the anatomical preparation, or the partial regeneration of organic
tissues of human or animal origin.
However, the use of dialkyl ketone peroxides per se as sterilizing, antiseptic,
disinfecting or anti-parasitic agents has not been described or demonstrated.
Surprisingly, the present authors have discovered that dialkyl ketone
peroxides can be used per se as sterilizing, antiseptic, disinfecting or anti-parasitic
agents without any noxious effects, both from the toxicological and environmental
point of view, something that is very uncommon among the disinfectants and
parasiticides currently known and used in the state of the art, and something that is
totally novel in the case of sterilising agents.
The absence of toxicity represents a top-level innovating characteristic,
especially in the ambit of sterilisation, in that the few products that are actually
commercialised have a very elevated level of toxicity. According to European law,
and probably that of all developed countries, the existence of a less toxic product
that fulfils the same functions obliges the user to employ it in substitution of the
more toxic product. The legislation also foments and promotes the research and
development of alternative technologies that reduce the level of danger in the
workplace in all areas. It is for this reason that this product has an enormous
inventive importance, constituting a clear advance in the existing technology at a
worldwide level.
Therefore, the aim of the present invention is to provide the use of said
dialkyl ketone peroxides, or of isomers of these compounds, as non-toxic sterilizing,
antiseptic, disinfecting or anti-parasitic agents with a very wide spectrum of activity
in terms of the type of organisms on which they act (bacteria, virus, fungi, spores,
mycobacteria, protozoa, algae, prions, parasites, etc.), and in as much as the type
of applications in which they can be employed (human and animal therapies,
hygiene, packing, medical and industrial instruments, healthcare environments and
sanitary surfaces, premises, general surfaces, industrial installations, refrigeration
towers, sanitary hot water circuits, purification of drinking water for human or animal
consumption, etc.).
OBJECT OF THE INVENTION
One object of the present invention is to provide the use of a dialkyl ketone
peroxide, or an isomers or mix of isomers of this compound, to be used as a
sterilizing, antiseptic, disinfecting and anti-parasitic agent.
Another object of the present invention is to provide the use of compositions
that include said dialkyl ketone peroxide, or isomers or a mixture of isomers of this
compound, to be used as a sterilizing, antiseptic, disinfecting or anti-parasitic agent.
Finally, another object of the present invention is to provide a method of
sterilisation, disinfection, asepsia or deparasitisation that involves the application of
said composition.
Accordingly, the present invention provides a method of sterilisation,
disinfection, asepsia or deparasitisation that comprises the application of a
composition comprising as active ingredient a di(C1-C20)alkyl ketone peroxide of
formula (I):

or a stereoisomer thereof, or a mixture thereof, in a percentage by volume
comprised between an effective amount and 5%, wherein R1 and R2 represent
independently a C1-C20 alkyl group, linear or branched, on medical and industrial
instruments, on sanitary surfaces and premises, on surfaces in general, with the
proviso that said surfaces are not animal or human surfaces, in industrial
installations, refrigeration towers, air conditioning conduits, machinery and
installations in the food industry, agriculture and fisheries installations, sanitary hot
water circuits, in purification of drinking water for human or animal consumption.
DETAILED DESCRIPTION OF THE INVENTION
The invention provides the use of dialkyl ketone peroxide, or an isomer or a
mixture of isomers of the same, as a sterilizing, antiseptic, disinfecting and anti-
parasitic agent.
In the present invention, the term "sterilizing agent" refers to any chemical
substance that eliminates all life forms, including spores. Likewise, the term
"antiseptic agent" refers to any chemical substance that prevents the growth or
action of micro-organisms, be it through their destruction or by inhibiting their
growth and activity, being a substance that can be applied to the body of a human
or animal. Finally, the term "disinfecting agent" refers to any chemical substance
that destroys the vegetative forms but not necessarily the resistant forms of
pathogenic micro-organisms, being a substance that is applied to inanimate objects.
In the context of the invention, the term "anti-parasitic agent" refers to any
physical or chemical agent to fight against parasites, eliminating them, repelling
them or attracting them, including the products used directly or indirectly for human
or veterinary hygiene. In particular, it refers to insecticides, miticides and
arachnicides.
All these agents can be considered as biocides, given that they are active
substances, or preparations that contain one or more active substances, destined to
destroy, or repel, or inactivate the harmful or damaging organisms, to prevent their
activity, or to fight against them by any means, through a biological or chemical
action.
In one particular embodiment of the present invention, said dialkyl ketone
peroxide is employed as a bactericide, virucide, fungicide, sporicide,
mycobactericide, protocide, algicide, prionicide, insecticide, arachnicide or miticide.
In accordance with another preferred embodiment of the present invention,
the dialkyl ketone peroxide of dealt with can be the (C1-C20) dialkyl ketone
peroxide, or an isomer or a mixture of isomers of the same, preferably of (C1-C6)
dialkyl ketone peroxide, or an isomer or a mixture of isomers of the same.
In the context of the invention the term "dialkyl ketone peroxide" refers to
compounds of the formula (I):

wherein R1 and R2 are the same or different, and they independently represent a
(C1-C20) alkyl group, preferably a (C1-C6) alkyl group. Such alkyl groups can be
linear or branched.
One of the preferred dialkyl ketone peroxides that is encompassed within the
present invention is methyl ethyl ketone peroxide, or an oligomer thereof, or an
isomer thereof, or mixtures thereof.
In the context of the invention, the use of both the dialkyl ketone peroxide itself, an
oligomer thereof, an isomer thereof, or mixtures thereof is contemplated. The term
"Isomer" refers to stereoisomer (an enantiomer, in the case that one or more chiral
carbons might exist, or a diastereoisomer), etc.
In the case of ethyl methyl ketone peroxide, the following monomer and oligomers are
known:
In another specific embodiment of the present invention, the dialkyl ketone
peroxide described above is employed in very diverse applications in the areas
including: human and animal therapy, human and animal hygiene, the washing and
disinfection of healthy or damaged skin in man or in animals, packaging, wrappings,
medical and industrial instruments, sanitary surfaces and healthcare environments,
premises, surfaces in general, industrial installations, refrigeration towers, air
conditioning conduits, machinery and installations in food production, agriculture
and fisheries installations, sanitary hot water circuits, purification of drinking water
for human or animal consumption, or any other application in the industrial,
domestic, environmental, agricultural, forestry, urban, pharmaceutical, civil, military,
police enforcement, scientific, technological, spatial, geological, healthcare or health
prevention areas for which the usefulness of the biocide properties of dialkyl ketone
peroxide are demonstrated.
In human and animal therapy, the dialkyl ketone peroxide can be used as a
bactericide, virucide, fungicide, sporicide, mycobactericide, protocide, algicide,
prionicide or an anti-parasitic agent, by topical application to infected or infested
skin, in distinct pharmaceutical formulations and forms, including those that are
mentioned here: pomade, cream, lotion, solution, ointment, powder, solid bar,
suspension, emulsion, nebuliser or spray.
Likewise, dialkyl ketone peroxide can also be used as a bactericide, virucide,
fungicide, sporicide, mycobactericide, protocide, algicide, prionicide or an anti-
parasitic agent, by enteral or parenteral, oral, rectal, vaginal, intramuscular,
intradermic, intravenous or intra-arterial application, with the aim of combating
infections by bacteria, mycobacteria, fungi, viruses, prions, protozoa, etc., in distinct
pharmaceutical formulations and forms, including those that are mentioned here:
pomade, cream, lotion, solution, ointment, powder, solid bar, suspension, emulsion,
nebuliser, spray, syrup, enema, tablet, capsule, suppository, pessary, elixir or
mouthwash.
In human hygiene, the dialkyl ketone peroxide is particularly useful in the
formulation of products such as toothpastes and mouthwashes, for example, as an
antiseptic at a concentration around 0.25% (v/v), with the additional advantage of its
strong bleaching capacity of the dental enamel.
As mentioned above, the dialkyl ketone peroxide can be used as a
disinfectant with high level-sterilising capacity to chemically sterilise surgical
material that cannot be sterilised thermally, especially endoscopes, as well as the
surfaces of operating theatres and clean rooms. It can also be used to disinfect
materials that can be sterilised thermally, the use of such chemical sterilisation
offering an alternative method of sterilisation.
On the other hand, the dialkyl ketone peroxide can be used as a disinfectant
of organic residues, especially of the clinical or sanitary type, before their removal,
in order to reduce their levels of infectious toxicity and in this way better comply with
the laws concerning the Prevention of Risks in the Workplace and the Laws
concerning Hazardous Waste Material.
In the same way, another use of the dialkyl ketone peroxide is as an
environmental disinfectant in order to disinfect all types of surfaces arid non-surgical
materials, such as laboratory, food industry, pharmaceutical industry, biotechnologic
industry, etc.
The dialkyl ketone peroxide has also been employed as an antiseptic
disinfectant of healthy or damaged skin (with scars), or as liquid soap disinfectant to
wash the hands hygienically with disinfection included. The preparation of this form
is carried out by adding the product as an ingredient to a liquid soap.
Another of the uses of dialkyl ketone peroxide is as a disinfectant of
refrigeration towers against Legionella in refrigeration circuits. Its use consists in the
addition of a determined quantity of the product, depending on the volume of water
to be treated.
A further objective of the present invention is to provide the use of a
composition comprising (C1-C20) dialkyl ketone peroxide, or an isomer or a mixture
of isomers of the same, preferably of (C1-C6) dialkyl ketone peroxide, or an isomer
or a mixture of isomers of the same, as has been described previously, in a
percentage by volume less than or equal to 50%, and preferably less than or equal
to 20%, as a sterilizing, antiseptic, disinfecting and anti-parasitic agent.
In a preferred embodiment of the present invention, the use of a composition is
provided as a bactericide, virucide, fungicide, sporicide, mycobactericide, protocide,
algicide, prionicide, insecticide, arachnicide or miticide.
In a particular embodiment of the invention, the use of a composition is provided
that comprises (C1-C20) dialkyl ketone peroxide, or an isomer or a mixture of
isomers of the same, preferably of (C1-C6) dialkyl ketone peroxide, or an isomer or
a mixture of isomers of the same, as described previously, in a percentage by
volume less than or equal to 5%, and preferably less than or equal to 0.3%.
In a preferred embodiment of the present invention, a composition is
employed that comprises methyl ethyl ketone peroxide, or an isomer or a mixture of
isomers of the same.
In a preferred embodiment of the present invention, a composition is used
that comprises water, any adequate organic solvent, or an oil as an excipient.
Among the adequate organic solvents, the alcohols are preferred, and in particular,
an alcohol selected from hexylene glycol, polyethylene glycol, propylene glycol,
glycerin-formal, diacetone alcohol, ethanol, n-propanol or isopropanol.
The preparation of said composition is carried out by conventional methods,
by simply dissolving the dialkyl ketone peroxide in the adequate solvent through
mechanical agitation, preferably in a reactor for one hour.
The methyl ethyl ketone peroxide is commercially available through
numerous suppliers at a worldwide level, given that it is a widely used product in
industry. One of the commercial products available is Butanox M-50, whose
declared concentration of methyl ethyl ketone peroxide is 33% (w/v), always
expressed in an approximate form, the remaining 67% being the plasticizer
(dimethyl phthalate). Likewise, any other commercial product can be used in which
the concentration of peroxide generally, varies between 33 and 50% (w/v), the
remaining percentage corresponding to a plasticizer such as dimethyl phthalate or
isobutyl phthalate, or 2,2,4-trimethyl-1,3-pentane diol diisobutyrate, for example.
The use of this latter plasticizer is particularly advantageous, since it avoids the
possible release of phthalates.
Finally, the current invention provides a method of sterilisation, disinfection,
asepsia or deparasitisation that comprises the application of a composition
comprising (C1-C20) dialkyl ketone peroxide, or an isomer or a mixture of isomers
of the same, preferably (C1-C6) dialkyl ketone peroxide, or an isomer or a mixture
of isomers of the same, as previously described, with a percentage by volume equal
to or less than 50%, preferably equal to or less than 20%, as previously described.
In a particular embodiment, a method of sterilisation, disinfection, asepsia or
deparasitisation is provided that comprises the application of a composition
comprising (C1-C20) dialkyl ketone peroxide, or an isomer or a mixture of isomers
of the same, preferably (C1-C6) dialkyl ketone peroxide, or an isomer or a mixture
of isomers of the same, in a percentage by volume equal to or less than 5%,
preferably equal to or less than 0.3%.
In another preferred embodiment, a method of sterilisation, disinfection, asepsia or
deparasitisation is provided that comprises the application of a composition
comprising methyl ethyl ketone peroxide, or an isomer or a mixture of isomers of
the same.
In another particular embodiment, a method of sterilisation,
disinfection, asepsia or deparasitisation is provided that comprises the application of
a composition that uses water, any adequate organic solvent, or an oil as an
excipient. Among the adequate organic solvents, the alcohols are preferred and in
particular, an alcohol selected from hexylene glycol, polyethylene glycol, propylene
glycol, glycerin-formal, diacetone alcohol, ethanol, n-propanol or isopropanol.
The application of said composition is achieved through conventional
methods. In the case of intense disinfection or sterilisation, the mode of
employment is the manual immersion in a tank or a similar immersion performed
automatically using washing/disinfection machines. In the remaining applications,
said composition is employed by bringing the liquid product into contact with the
surface to be disinfected as usual. Among the usual ways to achieve this, the
following can be mentioned: nebulization with a nebuliser spray or a spray using
propellant gases; dispensation by means of a mechanical device (such as the liquid
soaps); pouring with or without dosification onto the hands, skin, an area, piping
installation or vessel containing the liquid to be treated; the simple application by
extending it with a brush, paintbrush, mop or cloth, or through a dropper, etc.
In the case of the application of the dialkyl ketone peroxide to refrigeration
towers in order to prevent or combat the Legionella bacteria, it is recommended to
use a 5% dilution of the active ingredient in n-propanol and water, and to dilute it
1:50 such that the active ingredient is applied at the concentration of 0.1% (v/v).
Likewise, in order to apply it in sanitary hot water systems, in the system the active
ingredient should be diluted to a concentration of 0.1% (v/v). Similarly, for water
circuits in the food industry, or for the purification of drinking water, the active
ingredient should be diluted to 0.1% (v/v). Finally, for intense disinfection it is
recommended that concentrations of 2% be used (v/v).
On the other hand, when referring to the applications for human hygiene
(mouthwashes and toothpastes, for example), it is recommended that the dialkyl
ketone peroxide be used at a concentration in the order of 0.25% (v/v).
The following examples illustrate the invention.
Example of a topical formulation:
Product 1- NEOSTEX
Antiseptic for the washing of hands
Examples of activity
EXAMPLE 1
Bactericidal Activity
Three solutions of methyl ethyl ketone peroxide were prepared at 0.06%, 0.125%
and 0.25% (v/v) by diluting Butanox M-50 (approximately 33% methyl ethyl ketone
peroxide; w/v) in sterile hard water (300 mg/l of CaCO3). A neutralising solution of
thioglycolate was added at 0.5%, in this way producing three clear and colourless
solutions.
Each of the aforementioned solutions was brought into contact with distinct
bacterial strains for 5, 15 and 30 minutes at a temperature of 20 °C (Pseudomonas
aeruginosa ATCC 15442, Escherichia coli ATCC 10536, Staphylococcus aureus
ATCC 6538, Enterococcus hirae ATCC 8043 and Legionella pneumophila ATCC
33152) and incubated at 20 °C.
The data from the validation assays are shown in Table I and the results of
the bactericidal activity of each one of the three methyl ethyl peroxide solutions are
shown in Table 1.
Vc: viable count;
N: number of CFU/ml in the bacterial suspension in the assay;
Na: number of CFU/ml in the assay mixture ( 3 x 103 CFU/ml);
R: Reduction of viability (for a bactericidal effect to exist, R must be > 105)
Conclusion
The assays performed with the product dealt with in this invention, according
to the norm EN 1276 (1997) and at dilutions of 0.06%, 0.125% and 0.25% (v/v) in
hard water, demonstrate that said product possesses a bactericidal activity against:
Pseudomonas aeruginosa within 5, 15 and 30 minutes at the concentration of
0.06%; against Escherichia coli within 5 minutes at a concentration of 0.125% and
within 15 and 30 minutes at a concentration of 0.06%; against Staphylococcus
aureus within 5 and 15 minutes at 0.125% and within 30 minutes at 0.06%; against
Enterococcus hirae within 5 and 15 minutes at 0.25% and within 30 minutes at
0.125%; and against Legionella pneumophila within 5 minutes at 0.125% and within
15 and 30 minutes at a concentration of 0.06%.
EXAMPLE 2
Fungicidal Activity
Three solutions of methyl ethyl ketone peroxide were prepared at 0.06%, 0.125%
and 0.25% (v/v) by diluting Butanox M-50 (approximately 33% methyl ethyl ketone
peroxide; w/v) in a sodium chloride/tryptone solution. A solution of thioglycolate
(0.5%) was added as a neutralising agent.
Each of the solutions was brought into contact with the fungal strains Candida
albicans ATCC 10321 and Aspergillus niger ATCC 16404, for 5, 15 and 30 minutes
at a temperature of 20 °C and incubated at 30 °C.
The data from the validation assays are presented in Table II and the results
of the fungicidal activity of each of the three solutions of methyl ethyl ketone
peroxide are laid out in Table 2.
Conclusion
In accordance with the norm EN 1275 (October 1997), the product that is
the subject of this invention possess a fungicidal activity towards the strains
mentioned: Candida albicans ATCC 10321 and Aspergillus niger ATCC 16404.
EXAMPLE 3
Sporicidal Activity
Three solutions of methyl ethyl ketone peroxide were prepared at 15%, 20% and
25% (v/v) by diluting Butanox M-50 (approximately 33% methyl ethyl ketone
peroxide; w/v) in a sodium chloride/tryptone solution. Each of the solutions was
brought into contact with a suspension of Bacillus subtilis spores ATCC 19659, for
5, 15 and 30 minutes at a temperature of 20 °C, incubated at 35 °C, and placed on
a carrier disc in the presence of mucin and bovine serum albumin.
Method used: A carrier disc according to the norm ASTM E-2197-02.
Standard Quantitative Disk carrier test method for determining the bactericidal,
virucidal, fungicidal, mycobactericidal and sporicidal activities of liquid chemical
germicides. ASTM International, Pa, USA.
Suspension of Bacillus subtilis spores
ATCC 19659 of the assay.....................................................8.6x 102CFU/ml
Control of the suspension in the presence of mucin.......................8.1 x 102CFU/ml
Control of the suspension in the presence of bovine serum albumin
7.2x102 CFU/ml
The mean number of colony forming units per ml (CFU/ml) was determined
after the exposure of 10 test carrier disks to each concentration of the methyl ethyl
ketone peroxide indicated for the time specified. The results of the sporicidal activity
of each one of the three solutions of methyl ethyl ketone peroxide are shown in
Table 3.
Conclusion
The product that is dealt with in this invention, when used at the
concentration of 20% and 25% during 30 minutes, possesses absolute sporicidal
activity under the specific conditions of this assay. When used during 15 at a
concentration of 20% and 25%, the sporicidal activity is not absolute although it
significantly reduces the number of viable spores.
EXAMPLE 4
Virucidal Activity
A solution of methyl ethyl ketone peroxide was prepared at 0.25% (v/v) by diluting
Butanox M-50 (approximately 33% methyl ethyl ketone peroxide; w/v) in cell culture
medium. This solution was brought into contact with a suspension of poliovirus type
1 ATCC VR-192 for 15 minutes at a temperature of 20 °C; (incubation temperature:
35 °C).
The Method utilised: ASTM E-1053-97, is a Standard Test Method for
Efficacy of Virucidal Agents Intended for Inanimate Environmental Surfaces. ASTM
International, Pa, USA.
- Suspension of Poliovirus type 1 ATCC VR-192 assayed..............1 x107 TCID50
- Cell line used..............................................................................Vera cells.
- Control of the poliovirus type 1 suspension used under the assay conditions
without exposure to disinfectant, with titre in base 10 in order to calculate the
TCID50 units. Four replicates per dilution.
- Control of cytotoxicity of the disinfectant: observations of the effect on each cell
monolayer inoculated with disinfectant at dilutions in base 10 and intermediates
in base 2. Four replicates per dilution.
- Control of the cell monolayer, four replicates over 4 days of observation.
- Method of disinfectant neutralisation: dilution in cell culture medium until it is no
longer cytotoxic: 1:7,000 with four replicates.
The mean number of infective units per ml (TCID50) for a cell culture was
determined after exposing the 10 monolayers to each of the concentrations of the
product of the invention for the time indicated. The results of the virucidal activity of
the solution of methyl ethyl ketone peroxide are shown in Table 4.
TABLE 4- Virucidal Activity
CTX: cytotoxicity.
Conclusion
The product dealt with in this invention possesses an absolute virucidal
effect at a concentration of 0.25% within 15 minutes, with a reduction > 1 x 104
TCID50 against Poliovirus type 1 under the conditions indicated.
EXAMPLE 5
Mvcobactericidal Activity
Three solutions of methyl ethyl ketone peroxide were prepared at 1%, 2% and 4%
(v/v) by diluting Butanox M-50 (approximately 33% methyl ethyl ketone peroxide;
w/v) in a solution of sodium chloride-tryptone. Each of these solutions was brought
into contact with a suspension of Mycobacterium terrae ATCC 15755 for 5, 15 and
30 minutes at a temperature of 20 °C, incubated at 35 °C and then placed on a
carrier disk in the presence of mucin and bovine serum albumin.
The method used: ASTM E-2197-02. Standard Quantitative Disk carrier test
method for determining the bactericidal, virucidal, fungicidal, mycobactericidal and
sporicidal activities of liquid chemical germicides. ASTM International, Pa, USA.
-Suspension of Mycobacterium terrae ATCC 15755 in the assay........2,100 CFU/ml
- Control of the suspension in the presence of mucin..........................1,700 CFU/ml
- Control of the suspension in the presence of bovine serum albumin 1,850 CFU/ml
The mean number of colony forming units per ml (CFU/ml) recovered was
determined after the exposure of the 10 test carrier disks to each one of the three
test solutions of methyl ethyl ketone peroxide indicated during the time stipulated.
Conclusion
The product dealt with in this invention possesses a mycobactericidal effect
at a concentration of 1% within 15 and 30 minutes, and at the concentrations of 2%
and 4%, the mycobactericidal effect can be seen at 5, 15 and 30 minutes.
WE CLAIM:
1. Method of sterilisation, disinfection, asepsia or deparasitisation that comprises
the application of a composition comprising as active ingredient a di(C1-C20)alkyl
ketone peroxide of formula (I):

or a stereoisomer thereof, or a mixture thereof, in a percentage by volume
comprised between an effective amount and 5%, wherein R1 and R2 represent
independently a C1-C20 alkyl group, linear or branched, on medical and industrial
instruments, on sanitary surfaces and premises, on surfaces in general, with the
proviso that said surfaces are not animal or human surfaces, in industrial
installations, refrigeration towers, air conditioning conduits, machinery and
installations in the food industry, agriculture and fisheries installations, sanitary hot
water circuits, in purification of drinking water for human or animal consumption.
2. The method as claimed in claim 1, wherein the active ingredient is in a
percentage by volume comprised between an effective amount and 0.3%.
3. The method as claimed in claim 1 or 2, wherein the active ingredient is a di(C1-
C6) alkyl ketone peroxide.
4. The method as claimed in anyone of claims 1 to 3, wherein said composition
comprises methyl ethyl ketone peroxide.
5. The method as claimed in anyone of claims 1 to 4, wherein said composition
comprises water, or an adequate organic solvent or an oil as an excipient.
6. The method as claimed in claim 5, wherein the organic solvent is an alcohol.
7. The method as claimed in claim 6, wherein the alcohol is selected from: hexylene
glycol, polyethylene glycol 200, propylene glycol and glycerin-formal, diacetone
alcohol, ethanol, n-propanol or isopropanol
The present invention discloses a method of sterilisation, disinfection,
asepsia or deparasitisation that comprises the application of a composition
comprising as active ingredient a di(C1-C20)alkyl ketone peroxide of formula
(I):
or a stereoisomer thereof, or a mixture thereof, in a percentage by volume
comprised between an effective amount and 5%, wherein R1 and R2
represent independently a C1-C20 alkyl group, linear or branched, on
medical and industrial instruments, on sanitary surfaces and premises, on
surfaces in general, with the proviso that said surfaces are not animal or
human surfaces, in industrial installations, refrigeration towers, air
conditioning conduits, machinery and installations in the food industry,
agriculture and fisheries installations, sanitary hot water circuits, in
purification of drinking water for human or animal consumption.

Documents:

2258-KOLNP-2005-(03-01-2012)-FORM-27.pdf

2258-KOLNP-2005-CORRESPONDENCE 1.1.pdf

2258-KOLNP-2005-CORRESPONDENCE.pdf

2258-KOLNP-2005-FORM 27 1.1.pdf

2258-KOLNP-2005-FORM 27.pdf

2258-kolnp-2005-granted-abstract.pdf

2258-kolnp-2005-granted-assignment.pdf

2258-kolnp-2005-granted-claims.pdf

2258-kolnp-2005-granted-correspondence.pdf

2258-kolnp-2005-granted-description (complete).pdf

2258-kolnp-2005-granted-examination report.pdf

2258-kolnp-2005-granted-form 1.pdf

2258-kolnp-2005-granted-form 13.pdf

2258-kolnp-2005-granted-form 18.pdf

2258-kolnp-2005-granted-form 3.pdf

2258-kolnp-2005-granted-form 5.pdf

2258-kolnp-2005-granted-gpa.pdf

2258-kolnp-2005-granted-others.pdf

2258-kolnp-2005-granted-reply to examination report.pdf

2258-kolnp-2005-granted-specification.pdf


Patent Number 233883
Indian Patent Application Number 2258/KOLNP/2005
PG Journal Number 16/2009
Publication Date 17-Apr-2009
Grant Date 16-Apr-2009
Date of Filing 14-Nov-2005
Name of Patentee NEOCHEMICAL DESARROLLOS AVANZADOS, S. A.
Applicant Address CARRETERA DE MADRID A FRANCIA, KM. 33, 600, E-28805 ALCALA DE HENARES
Inventors:
# Inventor's Name Inventor's Address
1 RANDEZ GARCIA, JUAN, JOSE AV. SIGLO XXI 4, 2, 3° B, E-28660 BOADILL DEL MONTE
2 CORONADO LUENGO, ALONSO P° DE VALDELASFUENTES 14, PORTAL 8, 3° B, E-28100 ALCOBENDAS
PCT International Classification Number A61L 2/18, 9/14,
PCT International Application Number PCT/ES2004/000169
PCT International Filing date 2004-04-16
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 PCT/ES2003/00178 2003-04-16 Spain