EP3829654A1 - Procédé d'élimination de microorganismes présents dans et/ou à la surface d'un matériau à décontaminer - Google Patents
Procédé d'élimination de microorganismes présents dans et/ou à la surface d'un matériau à décontaminerInfo
- Publication number
- EP3829654A1 EP3829654A1 EP19734425.2A EP19734425A EP3829654A1 EP 3829654 A1 EP3829654 A1 EP 3829654A1 EP 19734425 A EP19734425 A EP 19734425A EP 3829654 A1 EP3829654 A1 EP 3829654A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- advantageously
- ratio
- wavelength
- decontaminated
- light beams
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
- A61L2/02—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor using physical phenomena
- A61L2/08—Radiation
- A61L2/10—Ultraviolet radiation
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
- A23L3/26—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by irradiation without heating
- A23L3/28—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by irradiation without heating with ultraviolet light
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
- A61L2/0005—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor for pharmaceuticals, biologicals or living parts
- A61L2/0011—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor for pharmaceuticals, biologicals or living parts using physical methods
- A61L2/0029—Radiation
- A61L2/0047—Ultraviolet radiation
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
- A61L2/02—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor using physical phenomena
- A61L2/08—Radiation
- A61L2/084—Visible light
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L2202/00—Aspects relating to methods or apparatus for disinfecting or sterilising materials or objects
- A61L2202/20—Targets to be treated
- A61L2202/23—Containers, e.g. vials, bottles, syringes, mail
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
Definitions
- the present invention relates to a method for eliminating, reducing or controlling microorganisms present in and / or on the surface of a material to be decontaminated, comprising an irradiation step, as well as an irradiation device.
- the term "material to be decontaminated” means a material which has been altered and / or infected by one or more microorganisms.
- the material to be decontaminated which has been altered and / or infected by one or more undesirable microorganisms.
- the material to be decontaminated can be in a solid form or in a liquid form. In the case where the material is in a liquid form, the material circulates inside a container, such as for example a pipe or a pipe.
- the material to be decontaminated can in particular be chosen from industrial equipment, soil, books, cartons, perishable goods, wine, seeds, wood, leather, building materials, textiles, plants, skin, mucous membranes, nails, contaminated water, ambient air, instruments for medical or veterinary use.
- International application WO2007 / 049962 describes in particular a method for controlling the growth of pathogen on plants or fungi via the application of continuous ultraviolet (UV) radiation for 24 hours.
- International application WO2005 / 049962 describes a method for controlling microbial proliferation on the surface of a food by applying an irradiation step using pulsed light based on ultraviolet (UV).
- these methods are not able to distinguish unwanted microorganisms from positive microbial flora.
- these methods also induce risks of genetic mutations for all organisms exposed to ultraviolet light, including the microorganisms themselves, operators, plants and / or animals treated. There is therefore a significant risk linked to these mutations which may increase the pathogenic power or induce resistance of the microorganisms to the various treatments known to date. For the operator, these genetic mutations can lead to the development of cancerous tumors.
- the subject of the present invention is therefore a method of eliminating microorganisms present in and / or on the surface of a material to be decontaminated, comprising a step of irradiating said material to be decontaminated by radiation consisting of at least two light beams al and a2 directed onto said material, said at least two light beams al and a2 having respectively a wavelength Al and A2 of between 380 and 420 nm.
- the method according to the invention makes it possible to control, reduce, eliminate and destroy the microorganisms present in or on the surface of a material to be decontaminated, whatever the type of material to be decontaminated, without using heat, gas or chemicals, such as pesticides.
- the method according to the invention has the advantage of being respectful of the environment and of having very little ecological impact.
- the method according to the invention makes it possible in particular to control, reduce, eliminate and destroy microorganisms by exposing them to radiation made up of at least two light beams a1 and a2 directed on said material. More particularly, the method according to the invention allows rapid deterioration of said microorganism, thereby reducing or eliminating cell division and / or the processes leading to the proliferation of the microorganism on the surfaces of materials.
- This process has the advantage of effectively controlling microbial contamination and specifically eliminating microorganisms present in or on the surface of materials, without altering the positive microbial flora.
- the term “elimination process” means any process making it possible to inactivate, eliminate, disinfect, decontaminate, destroy, eradicate or suppress certain types of microorganisms present in or on the surface of the materials to be decontaminated.
- the elimination method according to the invention makes it possible to eliminate, in the irradiated zone when the material is solid or within the material when it is a fluid, more than 20% of the microorganisms.
- microorganism means any single-celled eukaryotic organism.
- the microorganisms are undesirable microorganisms, also called alteration flora or pathogens, that is to say eukaryotic unicellular organisms capable of proliferating in or on the surface of a material, causing an alteration and / or a infection of said material, which can range from the appearance of simple surface punctures to partial or total decay of said material.
- undesirable microorganisms include: microorganisms belonging to the Fungi kingdom, and in particular fungi, yeasts or molds.
- the microorganisms according to the invention are microorganisms belonging to the reign of the Fungi.
- microorganisms belonging to the Fungi kingdom mention may be made in particular of microorganisms belonging to the divisions of ascomycota, basidiomycota or entorrhizomycota.
- ascomycota examples include the species Penicillium digitatum, Botrytis cinerea and Brettanomyces bruxellensis.
- the term "positive microbial flora" in the sense of the present invention any microorganism capable of proliferating in or on the surface of a material, without causing damage and / or infection of said material.
- a positive microbial flora mention may be made in particular of microorganisms which play a role in the conservation of the material or in the acquisition of its sensory typicity, such as Saccharomyces cerevisiae.
- the term "irradiation step” means a step consisting in voluntarily exposing said material to be decontaminated to radiation.
- the term "radiation” means the emission or transport of energy in the form of electromagnetic waves or particles.
- the radiation according to the invention is radiation in the form of electromagnetic waves, also called electromagnetic radiation.
- the electromagnetic radiation according to the invention is visible by the human eye.
- the radiation can be emitted by a single light source or by two different light sources.
- the radiation can be emitted by a single light source capable of emitting in an alternating, sequenced or simultaneous manner said at least two light beams a1 and a2 constituting the radiation.
- the radiation can be emitted by two different light sources, each emitting alternately, sequenced or simultaneously one of the light beams al or a2, constituting the radiation.
- the term "radiation consisting of at least two light beams al and a2" means radiation consisting of at least two light beams al and a2.
- the radiation may include other light beams in addition to the light beams a1 and a2.
- the radiation can comprise a light beam in addition to the light beams al and a2, advantageously two light beams in addition to the light beams al and a2, advantageously three light beams in addition to the light beams al and a2, advantageously four light beams in addition light beams al and a2, advantageously five light beams in addition to the light beams al and a2 or even more.
- the radiation consists only of the two light beams a1 and a2.
- the term “continuous” means the uninterrupted emission of the light beam al or of the light beam a2 or of the light beams al and a2, during a given time interval.
- sequenced or “pulsed” means the repeated emission of the light beam al or of the light beam a2 or of the light beams al and a2, at more or less regular time intervals.
- alternating means the successive emission of the light beam a1 then of the light beam a2, at more or less regular time intervals.
- the term "simultaneous" means the emission at the same time of the light beams a1 and a2.
- the method for removing microorganisms according to the invention comprising a step of irradiating said material to be decontaminated with radiation consisting of at least two light beams a1 and a2 directed onto said material, said at least two light beams a1 and a2 having respectively a wavelength A1 and A2 between 380 and 420 nm.
- the inventors have discovered that by irradiating a material to be decontaminated by radiation consisting of at least two light beams a1 and a2 directed onto said material, said at least two light beams a1 and a2 having respectively a wavelength A1 and A2 of between 380 and 420 nm, it is possible to selectively eliminate unwanted microorganisms. More particularly, the inventors have discovered that undesirable microorganisms are particularly sensitive to wavelengths between 380 and 420 nm, and in particular to wavelengths capable of specifically exciting porphyrins and / or ergosterol.
- Porphyrins have an important place in the metabolism of microorganisms and play in particular an important role in the mechanism of cellular respiration and in particular in the transport of dioxygen.
- the application of a beam having a wavelength specifically exciting the porphyrins will cause the formation of reactive oxygen derivatives, such as free radicals, singlet oxygen, oxygen ions and peroxides, this which will result in generating oxidative stress and damaging cell structures.
- Ergosterol is an essential constituent of the cell membrane of undesirable microorganisms.
- the application of a beam having a wavelength specifically exciting the ergosterol will cause the lysis of the cell membrane of the undesirable microorganism, leading to its death.
- the wavelength Al of the beam al is between 380 and 390 nm and in which the wavelength A2 of the beam a2 is between 400 and 420 nm. In a particularly advantageous embodiment of the invention, the wavelength Al of the beam al is 385 nm and in which the wavelength A2 of the beam a2 is 405 nm.
- the method for eliminating microorganisms comprising a step of irradiating said material to be decontaminated with radiation consisting of at least two light beams al and a2 directed on said material, in which said light beams al has a wavelength A1 between 380 and 390 nm and said light beams a2 has a wavelength A2 between 400 and 420 nm.
- the method for removing microorganisms according to the invention comprising a step of irradiating said material to be decontaminated with radiation consisting of at least two light beams a1 and a2 directed onto said material, in which said light beam a1 has a wavelength A1 of 385 nm and said light beam a2 has a wavelength A2 of 405 nm.
- the ratio of wavelengths l1: l2 ranges from 1: 99 to 99: 1.
- the wavelengths l1: l2 are applied at a ratio of 1: 99 , advantageously at a ratio of 2:98, advantageously at a ratio of 3:97, advantageously at a ratio of 4:96, advantageously at a ratio of 5:95, advantageously at a ratio of 6:94, advantageously at a ratio from 7:93, advantageously at a ratio of 8:92, advantageously at a ratio of 9:91, advantageously at a ratio of 10:90, advantageously at a ratio of 11: 89, advantageously at a ratio of 12:88, advantageously at a ratio of 13: 87, advantageously at a ratio of 14:86, advantageously at a ratio of 15: 85, advantageously at a ratio of 16:84, advantageously at a ratio of 17: 83, advantageously at a ratio of 18:82, advantageously at a ratio of 19:
- the material to be decontaminated is irradiated for a period of at least 10 milliseconds.
- the material to be decontaminated is irradiated for a period of at least 20 milliseconds, advantageously at least 50 milliseconds, advantageously at least 100 milliseconds, advantageously at least
- I second advantageously at least 5 seconds, advantageously at least 10 seconds, advantageously at least 15 seconds, advantageously at least 20 seconds, advantageously at least 25 seconds, advantageously at least 30 seconds , advantageously at least 35 seconds, advantageously at least 40 seconds, advantageously at least 45 seconds, advantageously at least 50 seconds, advantageously at least 55 seconds, advantageously at least one minute, advantageously at least 5 minutes, advantageously at least 10 minutes, advantageously at least 15 minutes, advantageously at least 20 minutes, advantageously at least 25 minutes, advantageously at least 30 minutes, advantageously at least 35 minutes, advantageously at least 40 minutes, advantageously at least 45 minutes, advantageously at least 50 minutes, advantageously at least 55 minutes, advantageously at least 1 hour, advantageously at least 2 hours, advantageous at least 3 hours, advantageously at least 4 hours, advantageously at least 5 hours, advantageously at least 6 hours, advantageously at least 7 hours, advantageously at least 8 hours, advantageously d '' at least 9 hours, advantageously at least 10 hours, advantageously at least
- the material to be decontaminated is irradiated for a period of between 10 milliseconds and one minute, advantageously between one second and one minute.
- the radiation consisting of at least two light beams a1 and a2 is applied at a dose of between 10 and 10 6 kJ / m 2 .
- the radiation consisting of at least two light beams a1 and a2 is applied at a dose of between 50 and 1000 kJ / m 2 .
- the radiation consisting of at least two light beams a1 and a2 is applied at a dose of between 100 and 700 kJ / m 2 .
- the radiation consisting of at least two light beams a1 and a2 is applied at a dose of between 100 and 300 kJ / m 2 .
- the radiation consisting of at least two light beams a1 and a2 is applied at a power density of between 100 W / m 2 and 1 GW / m 2 .
- the radiation consisting of at least two light beams a1 and a2 is applied at a power density of 1 kW / m 2 and 100 kW / m 2 .
- the radiation consisting of at least two light beams a1 and a2 is continuous or sequenced.
- the step of irradiating said material to be decontaminated is carried out by irradiating said material to be decontaminated for a period of at least 10 milliseconds, at a dose of between 100 and 10 6 kJ / m 2 .
- the method for removing microorganisms comprising a step of irradiating said material to be decontaminated with radiation consisting of at least at least two light beams al and a2 directed on said material, in which said light beams al has a wavelength Al of between 380 and 390 nm and said light beams a2 has a wavelength A2 of between 400 and 420 nm and wherein the step of irradiating said material to be decontaminated is carried out by irradiating said material to be decontaminated for a period of at least 10 milliseconds, at a dose of between 100 and 10 6 kJ / m 2 .
- the method for removing microorganisms comprising a step of irradiating said material to be decontaminated with radiation consisting of at least two light beams a1 and a2 directed onto said material, in wherein said light beams al has a wavelength A1 of 385 nm and said light beams a2 has a wavelength A2 of 405 nm and in which the step of irradiating said material to be decontaminated is carried out by irradiating said material to decontaminate for a period of at least 10 milliseconds, at a dose between 100 and 10 6 kJ / m 2 .
- the method for removing microorganisms comprising a step of irradiating said material to be decontaminated with radiation consisting of at least two light beams a1 and a2 directed onto said material, in wherein said light beam al has a wavelength Al of 385 nm and said light beam a2 has a wavelength A2 of 405 nm, in which the wavelength ratio Al: A2 is 50: 50 and in which step of irradiating said material to be decontaminated is carried out by irradiating said material to be decontaminated for a period of at least 10 milliseconds, at a dose of between 100 and 10 6 kJ / m 2 .
- the radiation is applied with an angle of incidence between 0 ° and 180 ° relative to the reference plane (PR).
- the angle of incidence is between 30 ° and 120 °.
- the material to be decontaminated can be in a solid form or in a liquid form. In the case where the material is in a liquid form, the material is placed in a container, such as for example a pipe or a pipe
- the material to be decontaminated is chosen from industrial equipment, soil, books, cartons, perishable foodstuffs, wine, seeds, wood, leather, building materials, textiles, plants, skin, mucous membranes, nails, contaminated water, ambient air, instruments for medical or veterinary use.
- the material to be decontaminated is chosen from industrial equipment, packaging, books, cartons, wood, wine, perishable goods, contaminated water and seeds.
- the term "industrial equipment” means any machine or tool necessary for the preparation, preservation or transport process. Examples include: cooking tanks, conveyors, conveyor belts, pressing drums, filtration and extraction units, storage tanks, mixing tanks, cutting, such as knives, mincers, grinders, washing units, grading units, pasteurization and sterilization units, dehulling units, the list not being exhaustive.
- the industrial equipment can be made of stainless steel, aluminum, plastic, such as polyvinyl chloride (PVC), polyethylene (PE), epoxy resin, resin polyurethane, wooden, the list is not exhaustive.
- the term "perishable foodstuffs" means any product or merchandise intended for food consumption. Mention may be made, as examples, of fruits and fresh vegetables, whatever their state, that is to say whole, cut or in pieces, processed, for example in the form of juice, in chopped form, in crushed form, mixed with other fruits or vegetables, unprocessed, chilled, frozen, frozen, the list is not exhaustive.
- the material to be decontaminated is industrial equipment.
- the material to be decontaminated is a packaging.
- the material to be decontaminated is a book.
- the material to be decontaminated is a cardboard.
- the material to be decontaminated is wood.
- the material to be decontaminated is wine.
- the material to be decontaminated is a perishable commodity.
- the material to be decontaminated is contaminated water, in particular water unfit for human or animal consumption.
- the material to be decontaminated is a seed.
- an irradiation device comprising at least one light source (1) emitting radiation consisting of at least two light beams al and a2, the two light beams al and a2 having respectively a length d wave A1 and A2 between 380 and 420 nm.
- the light beam al has a wavelength Al of 385 nm and the light beam a2 has a wavelength A2 of 405 nm.
- the radiation consisting of two light beams a1 and a2.
- the material to be decontaminated (2) when it is in a solid form, is placed on a reference plane, also called the work plane or zone in which the device is implemented.
- the radiation has an angle of incidence between 0 ° and 180 ° relative to the reference plane (PR).
- the reference plane is a horizontal geometric plane.
- the reference plane is an inclined geometric plane.
- inclined geometric plane is meant a plane having an angle of inclination between 1 ° and 90 ° relative to a horizontal geometric plane.
- the material to be decontaminated (2) when it is in a liquid form, circulates inside a pipe or a pipe.
- Said pipe or said pipe has a wall which is at least partially transparent, in order to allow the passage of radiation made up of at least two light beams a1 and a2.
- a wall which is at least partially transparent means a wall which can be either opaque or which does not allow the passage of radiation, comprising a transparent zone or a zone allowing the passage of radiation.
- the dimensions of the transparent zone will be determined by a person skilled in the art, so that all of the material to be decontaminated is irradiated. A person skilled in the art will be able to choose the diameter of the pipe or hose so that the material to be decontaminated when it is in liquid form is completely irradiated.
- the wall of the pipe or of the pipe is transparent.
- the pipe or pipe extends in a direction parallel to the reference plane (PR).
- Figure IA represents an irradiation device according to the invention a1 and a2 represent the light beams having respectively a wavelength Al and A2 and PR represents the reference plane.
- PR is a horizontal geometric plane.
- the light beams al and a2 are shown separately in parallel. This representation is intended to facilitate reading.
- the light beams al and a2 are emitted by a single light source (1).
- xl and x2 each represents the angle of incidence of the radiation with respect to the reference plane.
- the material to be decontaminated (2) can be either in a solid form, or in a liquid form. In the latter case, the material in liquid form circulates in a pipe or a pipe.
- FIG. 1B represents an irradiation device comprising two light sources (10) and (20) each emitting respectively radiation consisting of a light beam al and a2 represent the light beams having respectively a wavelength Al and A2 and PR represents the reference plane xl and x2 each represents the angle of incidence of each of the radiations with respect to the reference plane.
- PR is a horizontal geometric plane.
- the material to be decontaminated (2) can be either in a solid form or in a liquid form. In the latter case, the material in liquid form circulates in a pipe or a pipe.
- Figure IC represents an irradiation device according to the invention al and a2 represent the light beams having respectively a wavelength A1 and A2 and PR represents the reference plane.
- PR is an inclined geometric plane, having an angle of inclination w relative to a horizontal geometric plane (PH).
- PH horizontal geometric plane
- the light beams al and a2 are shown separately in parallel. This representation is intended to facilitate reading.
- the light beams al and a2 are emitted by a single light source (1).
- xl and x2 each represents the angle of incidence of the radiation with respect to the reference plane.
- the material to be decontaminated (2) can be either in a solid form or in a liquid form. In the latter case, the material in liquid form circulates in a pipe or a pipe.
- Figure 1D shows an irradiation device comprising two light sources (10) and (20) each emitting radiation respectively consisting of a light beam a1 and a2 represent the light beams having respectively a wavelength Al and A2 and PR represents the inclined geometric plane, having an angle of inclination w relative to a horizontal geometric plane (PH) xl and x2 each represents the angle of incidence of each of the radiations relative to the reference plane.
- PR is a horizontal geometric plane.
- the material to be decontaminated (2) can be either in a solid form or in a form liquid. In the latter case, the material in liquid form circulates in a pipe or a pipe.
- FIG. 2 illustrates the efficiency of the step of irradiation with radiation consisting of a light beam al having a wavelength Al of 385 nm on the viability of the yeasts Saccharomyces cerevisiae and Brettanomyces bruxellensis as a function of the irradiation time varying from 30 minutes to 1 hour.
- the power intensity of the radiation used is 3382 W / m 2 .
- FIG. 3 illustrates the efficiency of the step of irradiation with radiation consisting of a light beam a2 having a wavelength A2 of 405 nm on the viability of the yeasts Saccharomyces cerevisiae and Brettanomyces bruxellensis as a function of the irradiation time varying from 30 minutes to 1 hour.
- the power intensity of the radiation used is 3382 W / m 2 .
- FIG. 4 illustrates the efficiency of the step of irradiation with radiation consisting of two light beams al and a2 having respectively a wavelength Al of 385 nm and a wavelength A2 of 405 nm on the viability of yeasts Saccharomyces cerevisiae and Brettanomyces bruxellensis as a function of the irradiation time varying from 30 minutes to 1 hour.
- the power intensity of the radiation used is 160 W / m 2 .
- FIG. 5 illustrates the efficiency of the step of irradiation with radiation consisting of a light beam al having a wavelength Al of 385 nm on the filamentous fungi Penicillium digitatum and Botrytis cinerea by measuring the surface occupied by the fungus on agar after 24 hours of culture depending on the irradiation time varying from 30 minutes to 1 hour.
- the radiation used has an angle of incidence of 30 ° relative to the reference plane and the power intensity is 3382 W / m 2 .
- FIG. 6 illustrates the efficiency of the step of irradiation with radiation consisting of a light beam a2 having a wavelength A2 of 405 nm on the filamentous fungi Penicillium digitatum and Botrytis cinerea by measuring the surface occupied by the fungus on agar after 24 hours of culture depending on the irradiation time varying from 30 minutes to 1 hour.
- the power intensity of the radiation used is 3382 W / m 2 .
- FIG. 7 illustrates the efficiency of the step of irradiation with radiation consisting of two light beams al and a2 having respectively a wavelength Al of 385 nm and a wavelength A2 of 405 nm on the filamentous fungi Penicillium digitatum and Botrytis cinerea by measuring the surface occupied by the fungus on the agar after 24 hours of culture as a function of the irradiation time varying from 30 minutes to 1 hour.
- the power intensity of the radiation used is 160 W / m 2 .
- FIG. 8 illustrates the efficiency of the elimination method according to the invention implementing a step of irradiation with continuous radiation consisting of a light beam al having a wavelength Al of 385 nm, or by continuous radiation consisting of a light beam a2 having a wavelength A2 of 405 nm or by continuous radiation consisting of a light beam al having a wavelength Al of 385 nm and a light beam a2 having a length d 405 nm A2 wave to decontaminate solid media contaminated by the species Saccharomyces cerevisiae, Brettanomyces bruxellensis, Penicillium digitatum and Botrytis cinerea by measuring the survival rate of the species.
- the irradiation times are 1, 2 or 5 minutes, n.d. means "not determined”.
- FIG. 9 illustrates the effectiveness of the elimination method according to the invention implementing a step of irradiation with radiation by a well consisting of a light beam al having a wavelength Al of 385 nm, or by radiation by well consisting of a light beam a2 having a wavelength A2 of 405 nm or by radiation by well consisting of a light beam al having a wavelength Al of 385 nm and of a light beam a2 having a wavelength A2 of 405 nm for decontaminating solid media contaminated by the species Saccharomyces cerevisiae, Brettanomyces bruxellensis, Penicillium digitatum and Botrytis cinerea by measuring the survival rate of the species.
- the irradiation time is 2 minutes n.d. means "not determined".
- FIG. 10 illustrates the effectiveness of the elimination method according to the invention implementing a step of irradiation by alternating radiation consisting of a light beam al having a wavelength Al of 385 nm, then of radiation by well consisting of a light beam a2 having a length wave A2 of 405 nm to decontaminate solid media contaminated by the species Saccharomyces cerevisiae, Brettanomyces bruxellensis, Penicillium digitatum and Botrytis cinerea by measuring the survival rate of the species.
- the irradiation time is 2 minutes na means "not determined".
- Figure 11 illustrates the effectiveness of the elimination method according to the invention implementing a step of irradiation with continuous radiation consisting of a light beam al having a wavelength Al of 385 nm, or by continuous radiation consisting of a light beam a2 having a wavelength A2 of 405 nm or by continuous radiation consisting of a light beam al having a wavelength Al of 385 nm and a light beam a2 having a length d 405 nm A2 wave to decontaminate liquid media contaminated by the species Saccharomyces cerevisiae, Brettanomyces bruxellensis, Penicillium digitatum and Botrytis cinerea by measuring the species survival rate.
- the irradiation times are 5 and 10 minutes, n.d. means "not determined”.
- FIG. 12 illustrates the effectiveness of the elimination method according to the invention implementing a step of irradiation with continuous radiation consisting of a light beam al having a wavelength Al of 385 nm, or by continuous radiation consisting of a light beam a2 having a wavelength A2 of 405 nm to decontaminate inert surfaces (High Density Polyethylene (HDPE), Polypropylene (PP), glass and stainless steel) contaminated by the species Saccharomyces cerevisiae, by measuring the survival rate of the species.
- the irradiation times are 1, 2 or 5 minutes, n.d. means "not determined”.
- Example 1 Measuring the effectiveness of the according to the invention
- 2 yeasts Saccharomyces cerevisiae and Brettanomyces bruxellensis
- 2 filamentous fungi Penicillium digitatum and Botrytis cinerea was carried out in liquid YPD medium, containing a yeast extract (10 g / l), peptone (20 g / l) and dextrose (20 g / l), at 25 ° C in a 250 ml Erlenmeyer flask containing 100 ml of YPD medium stirred at 250 rpm until reaching the stationary phase. A volume of the preculture was then transferred to an Erlenmeyer flask containing 100 ml of fresh YPD medium to reach an optical density at 600 nm of 0.05. The culture was carried out at 25 ° C. with a rotation of 250 rpm until reaching the early stationary phase. The optical density at 600 nm is then adjusted to 1 for all the cultures.
- Cascade dilutions are then made and 10 ⁇ l drops of each dilution are placed on agar YPD medium.
- petri dishes intended for treatment or serving as a control are prepared. The dishes serving as a control are directly incubated in the dark at 25 ° C.
- the treated boxes are irradiated for 30 or 60 min with:
- the treated dishes are then incubated in the dark at 25 ° C.
- CFU colony forming units
- the percentage of survival is estimated by making the ratio of the number of CFU / ml for each treatment to the number of CFU / ml of the control.
- Penicillium digitatum and Botrytis cinerea which are filamentous fungi
- the efficacy of the treatment is evaluated by measuring the area occupied by the fungus on the agar after 24 hours of culture. The results are expressed as a percentage (%) of the area occupied by the fungi on the control dishes.
- the application of the radiation consisting of two light beams al and a2 makes it possible to eliminate more than 99.9% of Brettanomyces bruxellensis after 30 minutes of irradiation (see Figure 4) without altering the population of Saccharomyces cerevisiae (92% of viability).
- Treatments Cascade dilutions are then made and drops of 10 mI of each dilution are placed on Yeast Peptone Dextrose (YPD) and Malt Citric Acid Triton agar medium. For each strain and each dilution, petri dishes intended for treatment or serving as a control are prepared. The dishes serving as a control are directly incubated in the dark at 25 ° C.
- YPD Yeast Peptone Dextrose
- Malt Citric Acid Triton agar medium Malt Citric Acid Triton agar medium.
- the treated dishes are irradiated for 1, 2 or 5 minutes with: continuous radiation consisting of a light beam al having a wavelength Al of 385 nm; - continuous radiation consisting of a light beam a2 having a wavelength A2 of 405 nm; continuous radiation as described above and consisting of two light beams al and a2, the light beam al having a wavelength Al of 385 nm and the light beam a2 having a wavelength A2 of 405 nm.
- the Brettanomyces bruxellensis yeast is much more sensitive to the wavelength 405 nm than to the wavelength 385 nm for short treatment times of 1 to 2 minutes. For treatment times of 5 minutes, the use of each wavelength alone or in combination has the same result with a destruction of more than 99.999% of the cells.
- the surface power useful for decontaminating this microorganism should not be displaced 330 J / cm 2 .
- the spores of Penicillium digitatum fungi are similarly impacted by the wavelengths 385 nm and 405 nm for 1.2 and 5 minutes of treatment, with good resistance of the spores to light treatment because only about 80% of mortality is observed after 5 minutes of treatment. Effective destruction of the spores of Penicillium digitatum requires treatment with the two wavelengths combined for 5 minutes with a surface power of 660 J / cm 2 .
- Botrvtis cinerea Compared to the species Botrvtis cinerea:
- Botrytis cinerea spores are more affected by treatments with the 405 nm LED than with the 385 nm LED.
- An interesting destruction of these fungus spores is observed from 2 minutes of treatment with the LED 405 nm (surface energy of 132 J / cm 2 ) and from 5 minutes with the LED 385 nm (surface energy of 330 J / cm 2 ) (approximately 99.8% mortality).
- Treatment 2 The treated boxes are irradiated by well for 2 minutes with periods without light with: radiation by well for 2 minutes consisting of a light beam al having a wavelength Al of 385 nm; a 2-minute beam radiation consisting of a light beam a2 having a wavelength A2 of 405 nm; 2 minute radiation per well as described above and consisting of two light beams al and a2, the light beam al having a wavelength Al of 385 nm and the light beam a2 having a wavelength A2 of 405 nm .
- Saccharomyces cerevisiae shows no difference in mortality between all of the treatments studied.
- Brettanomyces bruxellensis is very strongly destroyed by the use of the wavelength 385 nm.
- the spores of the two filamentous fungi Pénicillium digitatum and Botrytis cinerea are interestingly destroyed with the use of 405 nm wavelength by dip (at least 95% mortality after two minutes of dip regardless of the frequency of the dip) .
- the treated boxes are irradiated by alternating two light beams al and a2, the light beam al having a wavelength Al of 385 nm and the light beam a2 having a wavelength A2 of 405 nm for 2 minutes.
- the decontamination tests by continuous treatment of the fungi in a liquid medium were carried out using 4 ml of PBS (Phosphate Buffer Saline).
- PBS Phosphate Buffer Saline
- the four microorganisms were tested by performing light treatments varying from 1 to 20 minutes, with a surface energy varying from 552 to 11,040 J / cm 2 , with each wavelength used alone and the two in synergy.
- the survival rate for each microorganism is very dependent on the light treatment carried out and its duration.
- Saccharomyces cerevisiae is very resistant in liquid medium for short treatment times and with each wavelength used separately.
- the use of the two wavelengths in synergy allows a drastic destruction of the yeast after 5 minutes of treatment (destruction of more than 99.99%).
- the spores of the Penicillium digitatum fungus are more than 99% destroyed for a treatment time of 10 minutes, whether with 385 nm LEDs alone, 405 nm alone or both in synergy. Light treatments are less effective on Botrytis cinerea spores. After 10 minutes of continuous treatment, only about 96% of the spores are destroyed.
- the Brettanomyces bruxellensis yeast is very sensitive to decontamination treatments in liquid medium because after only 2 minutes of treatment (LED 385 nm or 405 nm), the mortality rate obtained is approximately 99.5%. After 10 minutes of treatment with the two wavelengths combined, more than 99.99% of the cells are destroyed.
- the two wavelengths can be used alone or in combination.
- the duration of the light treatment is much longer than in a solid medium to hope for a correct destruction of the alteration microorganisms (10 minutes necessary to destroy at least 95% of the fungi), except the yeast Brettanomyces bruxellensis which is very sensitive to light treatments in liquid medium.
- Saccharomyces cerevisiae precultures are obtained as presented in Example 1.
- HDPE high density polyethylene
- PP polypropylene
- stainless steel stainless steel
- the 405 nm LEDs are more effective than the 385 nm LEDs in decontaminating the 4 inorganic surfaces. Indeed, the survival rate of Saccharomyces cerevisiae is around 55% for 385 nm LEDs against 35% for 405 nm LEDs.
- the survival rate drops sharply (around 7% for 385 nm LEDs for HDPE, PP and glass surfaces and 3% for 405 nm LEDs for these same surfaces).
- a 2-minute light treatment destroys more than 99.997% of Saccharomyces cerevisiae on a stainless steel surface, whether with 385 or 405 nm LEDs. After 5 minutes of treatment, whatever the wavelength used, more than 99.997% of Saccharomyces cerevisiae is destroyed on all surfaces.
- the process of the invention is therefore particularly effective for decontaminating the inorganic surfaces typical of the food industry with a very attractive energy cost.
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FR1857008A FR3084262B1 (fr) | 2018-07-27 | 2018-07-27 | Procede d’elimination de microorganismes presents dans et/ou a la surface d’un materiau a decontaminer |
PCT/EP2019/067964 WO2020020595A1 (fr) | 2018-07-27 | 2019-07-04 | Procédé d'élimination de microorganismes présents dans et/ou à la surface d'un matériau à décontaminer |
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US7401943B2 (en) * | 2005-06-07 | 2008-07-22 | Fusion Uv Systems, Inc. | Solid-state light sources for curing and surface modification |
JP2009512457A (ja) | 2005-10-24 | 2009-03-26 | クリーン・ライト・ベスローテン・フェンノートシャップ | Uv−c光により生きた植物または生きた植物部分またはキノコを処理する方法 |
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