WO2008058272A2 - Polymer-based antimicrobial agents, methods of making said agents, and products and applications using said agents - Google Patents
Polymer-based antimicrobial agents, methods of making said agents, and products and applications using said agents Download PDFInfo
- Publication number
- WO2008058272A2 WO2008058272A2 PCT/US2007/084269 US2007084269W WO2008058272A2 WO 2008058272 A2 WO2008058272 A2 WO 2008058272A2 US 2007084269 W US2007084269 W US 2007084269W WO 2008058272 A2 WO2008058272 A2 WO 2008058272A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- metal
- antimicrobial agent
- water
- acid
- agent according
- Prior art date
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K9/00—Medicinal preparations characterised by special physical form
- A61K9/10—Dispersions; Emulsions
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K33/00—Medicinal preparations containing inorganic active ingredients
- A61K33/24—Heavy metals; Compounds thereof
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
- A01N25/08—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests containing solids as carriers or diluents
- A01N25/10—Macromolecular compounds
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N37/00—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom having three bonds to hetero atoms with at the most two bonds to halogen, e.g. carboxylic acids
- A01N37/36—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom having three bonds to hetero atoms with at the most two bonds to halogen, e.g. carboxylic acids containing at least one carboxylic group or a thio analogue, or a derivative thereof, and a singly bound oxygen or sulfur atom attached to the same carbon skeleton, this oxygen or sulfur atom not being a member of a carboxylic group or of a thio analogue, or of a derivative thereof, e.g. hydroxy-carboxylic acids
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N59/00—Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
- A01N59/14—Boron; Compounds thereof
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N59/00—Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
- A01N59/16—Heavy metals; Compounds thereof
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N59/00—Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
- A01N59/16—Heavy metals; Compounds thereof
- A01N59/20—Copper
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K45/00—Medicinal preparations containing active ingredients not provided for in groups A61K31/00 - A61K41/00
- A61K45/06—Mixtures of active ingredients without chemical characterisation, e.g. antiphlogistics and cardiaca
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K9/00—Medicinal preparations characterised by special physical form
- A61K9/70—Web, sheet or filament bases ; Films; Fibres of the matrix type containing drug
- A61K9/7015—Drug-containing film-forming compositions, e.g. spray-on
Definitions
- the invention relates to antimicrobial agents, products incorporating such agents, and methods of making such products. More particularly, the invention relates to polymer-based antimicrobial agents.
- Silver and silver salts are commonly used as antimicrobial agents.
- An early medicinal use of silver was the application of aqueous silver nitrate solutions to prevent eye infection in newborn babies.
- Silver salts, colloids, and complexes have also been used to prevent and to control infection.
- Other metals such as gold, zinc, copper, and cerium, have also been found to possess antimicrobial properties, both alone and in combination with silver. These and other metals have been shown to provide antimicrobial behavior even in minute quantities, a property referred to as "oligodynamic.”
- the styrene sulfonate polymer is prepared by reacting an acetyl sulfate sulfonation agent with a styrene copolymer in 1 ,2-dichloroethane (DCE).
- DCE 1 ,2-dichloroethane
- the coating is hydrophilic such that it retains a relatively large amount of water or water- containing fluid.
- One such disadvantage is that larger quantities of the silver metal are required to provide effective antimicrobial activity.
- a second disadvantage is that the carrier molecule is required which renders it more expensive as well as more difficult to dispose of the carrier byproduct.
- a third disadvantage is that a solvent other than water (e.g. DCE) is required to prepare the polymer matrix. Such solvents are typically hazardous because of their reactive nature and thus require special care in handling and disposing of such solvents, which limits the widespread acceptance of such antimicrobial polymers in many applications.
- the antimicrobial agent of the present invention includes a water-soluble polymer and oligodynamic metal ions which interact with counter-ions of the polymer such that the metal ions are bound to corresponding counter-ions.
- the water-soluble polymer controls a sustained release of the metal ions.
- the oligodynamic metal ions preferably include small size metal particles (e.g., nano-sized silver particles) that ionically bond or are electrostatically bound to the water-soluble polymer as well as metal ions derived from one or more water-soluble oligodynamic metal compositions (e.g., metal sulfates and/or metal nitrates).
- the small-size particles can aid in reducing the photosensitivity of the agent, and thus counter the proclivity of the agent to change color when subjected to light.
- the agent may also include one or more acids, including organic acids (such as sulfates, carboxylic acids, amines, hydroxyls, nitrates, and phosphates) and/or non-organic acids (such as boric acid and dioctylborate). This allows the total concentration of oligodynamic metal in the agent to be reduced significantly while maintaining or even enhancing antimicrobial activity. [0009] Additional objects and advantages of the invention will become apparent to those skilled in the art upon reference to the detailed description.
- the terms “colloid” and “colloidal” refer to a solution consisting of particles suspended in a liquid medium.
- An "ion” is an atom or a group of atoms that has acquired a net electric charge.
- the term “ionic” refers to a condition where an ion has an electric charge.
- An “electrostatic charge” is a charge that can be induced in a substance, for example, metallic silver particles, by passing a current over the substance.
- An “electrostatic attraction” is when a substance or particle with an electrostatic charge is attracted to a second substance which contains the opposite charge to the substance.
- Water- soluble means that the composition has a solubility of at least 2g in 10Og of water at room temperature.
- Small size in reference to metal particles means metal particles that have a size less than 1 ⁇ m in diameter and more preferably less than 0.01 ⁇ m in diameter.
- Nano-size or “Nano” in reference to metal particles means metal particles that have a size between 1 nm and 100nm in diameter.
- an antimicrobial agent is realized from a water- soluble polymeric substance that has pendant hydrophilic groups that are capable of binding with one or more oligodynamic metal ions.
- the hydrophilic groups of the polymer are capable of binding with one or more positively charged oligodynamic metal ions. Therefore, it is preferred that the water-soluble polymeric substance has negatively charged hydrophilic groups such as sulfates, phosphates, nitrates, carboxylates and the like.
- the water-soluble polymeric substance is dissolved in an aqueous solution.
- the aqueous solution preferably comprises water without any alcohols or other organic solvents.
- the aqueous solution can include one or more alcohols or other organic solvents (e.g., m-pyrol, dimethylformamide, dimethylacetamide, dimethyl sulfonamide, tetrahydrofuran, mixtures of the above, mixtures of the above with swelling solvents such as diethyl ether, xylene, toluene and the like) preferably in a range between 5% and 50% by weight.
- One or more compositions that include an oligodynamic metal are added to the polymeric aqueous solution.
- the oligodynamic metal(s) can be a noble metal (such as Ag, Au, Pt, Pd, Ir) or a heavy metal (such as Cu Sn, Sb, Bi and Zn).
- the one or more oligodynamic metal compositions include small size metal particles (most preferably, nano-sized silver particles) that carry an electrostatic charge and that dissolve or disperse in the polymeric aqueous solution and ionically bond to the hydrophilic group of the polymer.
- small size metal particles can also remain suspended as a colloid in the polymeric aqueous solution wherein the electrostatic charge carried by the small size metal particles can maintain the particles within the polymer matrix (in contrast to residing solely in solution) by electrostatic attraction.
- the one or more oligodynamic metal compositions added to the polymeric aqueous solution also preferably include at least one water-soluble metal composition of an oligodynamic metal that dissolves in the polymeric aqueous solution and ionically bonds to the hydrophilic group of the polymer.
- One or more acids e.g., organic acids and inorganic acids
- the range of total solids dissolved in water can be from 0.1 % to 5%, preferably from 0.3% to 3% and more preferentially from 0.5 to 2.5%.
- the range of small-size metal particles e.g., nano-sized silver particles
- the range of water soluble polymer is preferably from 1 to 20%, and most preferably from 5 to 6%
- the range of other oligodynamic metal compositions preferably in a range from 10 to 25%.
- the remaining solid content includes acids, organic and inorganic, that can comprise 50% to 75%, and most preferably from 70 to 75% of the solids component.
- hydrophilic polymers which may be used to form the compositions include, but are not limited to, polyurethanes, including sulfonated polyether polyurethanes, sulfonated polyester polyurethanes, sulfonated polyurethaneureas, and their copolymers, especially the polyethleneoxide copolymers; polyvinylpyrrolidones; polyvinyl alcohols; polyethylene glycols and their copolymers; polypropylene glycols and their copolymers; polyoxyethylenes and their copolymers; polyacrylic acid; polyacrylamide; carboxymethyl cellulose; cellulose and its derivatives; dextrans and other polysaccharides; starches; guar; xantham and other gums and thickeners; collagen; gelatins; and other biological polyurethanes, including sulfonated polyether polyurethanes, sulfonated polyester polyurethanes, sulfonated polyurethaneureas
- hydrophilic polymers can be reacted or co-polymerized with charged moieties to render them both water soluble as well as ionically charged.
- charged moieties include, sulfonation of the aromatic rings on aromatic polyurethanes; addition of methacrylic acid in the vinyl-based polymers.
- normally hydrophobic polymers that are rendered both hydrophilic and anionic by the addition of functional groups; for example, polystyrene is hydrophobic but can be rendered water soluble by sulfonating the styrene group.
- PET polyethylene terepthalate
- the preferred polymer is water soluble polystyrene with its copolymers, such as sulfonated polystyrene co-maleic acid.
- the antimicrobial agent of the invention is illustrated in the following example.
- a water-soluble sulfonated polystyrene is dissolved in water.
- Nano-size silver particles are added to the sulfonated polystyrene water solution and mixed together.
- the silver particles carry a positive electrostatic charge and dissolve or disperse in the polymeric aqueous solution and interact with the sulfonated polystyrene by ionic bonding wherein the sulfonate groups of the sulfonated polystyrene are the counter-ions to positively-charged silver ions.
- the polymer controls a sustained release of the positively-charged silver ions.
- the silver particles can also remain suspended as a colloid in the polymeric aqueous solution wherein the positive electrostatic charge carried by the silver particles can maintain the silver particles within the sulfonated polystyrene matrix (in contrast to residing solely in solution) by electrostatic attraction.
- the positively electrostatically charged nano-sized silver particles are attracted to the polar sulfonate groups of the sulfonated polystyrene.
- the nano-size silver particles aid in reducing the photosensitivity of the resulting composition, and thus counter the proclivity of the antimicrobial agent to change color when subjected to light. It is therefore desirous that when nano-sized silver particles are used, the silver ion-bound silver is reduced accordingly.
- water-soluble metal compositions that include an oligodynamic metal (or solutions based thereon) are added to the silver/sulfonated polystyrene water mixture and mixed together.
- water-soluble metal compositions include metal sulfates (such as copper (II) sulfate or zinc sulfate) and/or metal nitrates (such as silver nitrate, copper (II) nitrate and/or zinc nitrate).
- the ions of the oligodynamic metal composition(s) react with counter-ions of the polymer such that the metal ions are ionically bound to corresponding counter-ions, and the polymer controls a sustained release of the metal ions.
- One or more organic acids can be added to the oligodynamic metal/sulfonated polystyrene/water mixture and mixed together. This allows the total concentration of oligodynamic metal in the mixture to be reduced significantly while maintaining or even enhancing antimicrobial activity.
- organic acids include citric acid, malic acid, ascorbic acid, salicyclic acid, acetic acid, formic acid and the like.
- other mildly acidic acids can also be used in this cocktail such as boric acid, dioctylborate, and the like.
- Table 1 shows various concentrations of colloidal silver, metal compositions and acids that are mixed and reacted to a water-soluble sulfonated polymer carrier (showing actual amounts used and percentages).
- Table 1 employs divalent metals; however, monovalent or multivalent metals can also be used. Also note that when the organic carboxylic acids shown are mixed with the sulfonated polymer and the oligodynamic metal composition, a competing reaction occurs where some portion of the metal will couple with the sulfonated polymer and another portion of the metal will couple with the organic carboxylic acid(s). In the case where the metal couples with the sulfonated polymer, the counter ion is the sulfonate group on the polymer. In the case where the metal couples with the organic carboxylic acid(s), the counter ion is the organic carboxylic acid. The result of this competing reaction will depend on the stoicheometry, relative affinity and strength of the ionic bond.
- the liquid mixture of materials described above can be dried and ground to a fine powder and commercialized as a powdered-form antimicrobial agent.
- the solid content of the powdered-form antimicrobial agent preferably includes the following:
- - small-size metal particles e.g., nano-sized silver particles
- a range preferably from 0.05 to 5% and most preferably from 1 to 3%
- the user need only dilute the powder in an aqueous solution (which preferably includes only water but can include other solvents) to the desired concentration and spray, dip or drop the solution onto the substance to be coated.
- the powder may also be diluted in a water solution (or solvent solution) and added as part of an admixture during formation of the end product.
- the admixture may be a pulp that is processed to form a paper product.
- the solids content can range from 0.001 to 10%; preferably 0.1 to 2% of the solution used to coat the product.
- the ions of the oligodynamic metal compositions therein interact with counter-ions of the water-soluble polymer such that the metal ions are bound to corresponding counter-ions and the polymer controls a sustained release of the metal ions.
- the powdered-form antimicrobial agent of the present invention has many potential applications, including the abatement of mold in residential and commercial applications as well as for treatment and prevention of citrus canker in citrus groves.
- the powdered-form antimicrobial agent as described above is dissolved in an aqueous solution, which is applied in spray form onto wallboard, walls, floors, ceilings, or other home/building structural members.
- the powdered-form antimicrobial agent as described above is dissolved in an aqueous solution, which is applied in spray form onto the leaves and/or branches and/or trunk of the citrus tree.
- the solids concentrations of the powdered-form antimicrobial agent in the spraying mixture can range from 0.001 to 10%, and preferably from 0.1 to 2%. It is preferable that the mixture also contain a tackifier to help stick the antimicrobial mixture to the leaves and/or branches and/or trunk of the tree.
- An exemplary tackifier for this application includes one or more water soluble substances that are sticky; such as syrup (maple, corn, etc.), tree sap, polysaccharides, honey, vegetable oil derivatives and the like.
- the concentration of tackifier may comprise 0.1 to 2% of the diluted formulation.
- the viscosity of the solution may be increased, which will help suspend the additives in aqueous solution to help in spraying applications of the system.
- Thickening can be accomplished by adding more water soluble polymer or thickeners such as gums (agar, xanthum, guar, gellan, pectin), polysaccharide, gelatin, corn starch, and the like.
- the amount of thickener can range from 0.2 to 2%, with 0.5% of the total bath weight.
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- Life Sciences & Earth Sciences (AREA)
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- Zoology (AREA)
- Plant Pathology (AREA)
- Wood Science & Technology (AREA)
- Inorganic Chemistry (AREA)
- Dentistry (AREA)
- Engineering & Computer Science (AREA)
- Agronomy & Crop Science (AREA)
- Pest Control & Pesticides (AREA)
- Epidemiology (AREA)
- Veterinary Medicine (AREA)
- Public Health (AREA)
- Animal Behavior & Ethology (AREA)
- Pharmacology & Pharmacy (AREA)
- Medicinal Chemistry (AREA)
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Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
MX2009004968A MX2009004968A (en) | 2006-11-09 | 2007-11-09 | Polymer-based antimicrobial agents, methods of making said agents, and products and applications using said agents. |
EP07871421A EP2086511A4 (en) | 2006-11-09 | 2007-11-09 | Polymer-based antimicrobial agents, methods of making said agents, and products and applications using said agents |
CA002669334A CA2669334A1 (en) | 2006-11-09 | 2007-11-09 | Polymer-based antimicrobial agents, methods of making said agents, and products and applications using said agents |
AU2007317253A AU2007317253A1 (en) | 2006-11-09 | 2007-11-09 | Polymer-based antimicrobial agents, methods of making said agents, and products and applications using said agents |
BRPI0718703-3A BRPI0718703A2 (en) | 2006-11-09 | 2007-11-09 | POLYMER-BASED ANTIMICROBIAN AGENTS, METHODS FOR MANUFACTURING SUCH AGENTS AND PRODUCTS AND APPLICATIONS USING THESE AGENTS |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/558,027 US20070087023A1 (en) | 2005-03-11 | 2006-11-09 | Polymer-Based Antimicrobial Agents, Methods of Making Said Agents, and Applications Using Said Agents |
US11/558,027 | 2006-11-09 | ||
US11/558,023 | 2006-11-09 | ||
US11/558,023 US7951853B2 (en) | 2002-05-02 | 2006-11-09 | Polymer-based antimicrobial agents, methods of making said agents, and products incorporating said agents |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2008058272A2 true WO2008058272A2 (en) | 2008-05-15 |
WO2008058272A3 WO2008058272A3 (en) | 2008-10-02 |
Family
ID=39365394
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2007/084269 WO2008058272A2 (en) | 2006-11-09 | 2007-11-09 | Polymer-based antimicrobial agents, methods of making said agents, and products and applications using said agents |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP2086511A4 (en) |
AU (1) | AU2007317253A1 (en) |
BR (1) | BRPI0718703A2 (en) |
CA (1) | CA2669334A1 (en) |
CO (1) | CO6210718A2 (en) |
MX (1) | MX2009004968A (en) |
WO (1) | WO2008058272A2 (en) |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6605751B1 (en) * | 1997-11-14 | 2003-08-12 | Acrymed | Silver-containing compositions, devices and methods for making |
US6716895B1 (en) * | 1999-12-15 | 2004-04-06 | C.R. Bard, Inc. | Polymer compositions containing colloids of silver salts |
US20030185889A1 (en) * | 2002-03-27 | 2003-10-02 | Jixiong Yan | Colloidal nanosilver solution and method for making the same |
US6905711B1 (en) * | 2002-05-02 | 2005-06-14 | Smart Anti-Microbial Solutions, Llc | Antimicrobial agents, products incorporating said agents and methods of making products incorporating antimicrobial agents |
US7959980B2 (en) * | 2004-05-28 | 2011-06-14 | Ppg Industries Ohio, Inc. | Hydrophilic compositions, methods for their production, and substrates coated with such compositions |
US20060147549A1 (en) * | 2004-12-30 | 2006-07-06 | Grab Lawrence A | Methods and compositions for reducing population of plant pathogen |
AU2005329045A1 (en) * | 2005-03-11 | 2006-09-21 | Smart Anti-Microbal Solutions, Llc | Polymer-based antimicrobial agents, methods of making said agents, and products incorporating said agents |
-
2007
- 2007-11-09 EP EP07871421A patent/EP2086511A4/en not_active Withdrawn
- 2007-11-09 AU AU2007317253A patent/AU2007317253A1/en not_active Abandoned
- 2007-11-09 WO PCT/US2007/084269 patent/WO2008058272A2/en active Application Filing
- 2007-11-09 CA CA002669334A patent/CA2669334A1/en not_active Abandoned
- 2007-11-09 BR BRPI0718703-3A patent/BRPI0718703A2/en not_active IP Right Cessation
- 2007-11-09 MX MX2009004968A patent/MX2009004968A/en active IP Right Grant
-
2009
- 2009-05-08 CO CO09046861A patent/CO6210718A2/en not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of EP2086511A4 * |
Also Published As
Publication number | Publication date |
---|---|
CO6210718A2 (en) | 2010-10-20 |
AU2007317253A1 (en) | 2008-05-15 |
MX2009004968A (en) | 2009-08-12 |
CA2669334A1 (en) | 2008-05-15 |
EP2086511A2 (en) | 2009-08-12 |
WO2008058272A3 (en) | 2008-10-02 |
EP2086511A4 (en) | 2012-07-04 |
BRPI0718703A2 (en) | 2014-01-07 |
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