WO2012080660A1 - Nucléus recouvert de pha - Google Patents
Nucléus recouvert de pha Download PDFInfo
- Publication number
- WO2012080660A1 WO2012080660A1 PCT/FR2011/052987 FR2011052987W WO2012080660A1 WO 2012080660 A1 WO2012080660 A1 WO 2012080660A1 FR 2011052987 W FR2011052987 W FR 2011052987W WO 2012080660 A1 WO2012080660 A1 WO 2012080660A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- nucleus
- pha
- film
- pearl
- oyster
- Prior art date
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Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K61/00—Culture of aquatic animals
- A01K61/50—Culture of aquatic animals of shellfish
- A01K61/54—Culture of aquatic animals of shellfish of bivalves, e.g. oysters or mussels
- A01K61/56—Culture of aquatic animals of shellfish of bivalves, e.g. oysters or mussels for pearl production
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K61/00—Culture of aquatic animals
- A01K61/50—Culture of aquatic animals of shellfish
- A01K61/54—Culture of aquatic animals of shellfish of bivalves, e.g. oysters or mussels
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/80—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management
- Y02A40/81—Aquaculture, e.g. of fish
Definitions
- the present invention relates to the field of coating of cores in the context of pearl farming (production of pearls by pearl oysters).
- the subject of the present invention is therefore a nucleus coated with a homogeneous film having antibacterial properties, and making it possible to improve the quality of the pearl obtained and to reduce the mortality resulting from the insertion of said nucleus into the recipient pearl oyster and the phenomenon of nucleus rejection.
- Pearl culture is a human activity consisting of the cultivation, in the wild, of pearl oysters Pinctada sp for the production of cultured pearls.
- the first step is the collection and rearing of pearl oysters, which will serve as either donor oyster or recipient oyster.
- the graft consists of the surgical procedure in which the graft, a portion of the donor oyster coat epithelium (approximately 4 mm 2 ) is inserted into the recipient's oyster pearl pocket, in combination with a mother of pearl ball, the nucleus. Once inserted into the recipient oyster, the epithelial border of the graft multiplies and lines the pearl pocket to give the pearl sac that encompasses the nucleus.
- the pearl bag deposits layers of mother-of-pearl around the nucleus, resulting in the production of the pearl (Montagnani et al., 2009).
- the surface of the nucleus In order to guarantee the production of a quality pearl, the surface of the nucleus must be as regular as possible, without irregularities.
- the patent application JP05219856 describes the insertion in the recipient oyster, during the step of grafting and in parallel with the nucleus or with the nucleus, a solid material containing on its surface a water-soluble polymer associated with an antibiotic.
- the Japanese patent application JP02308869 claims the use of a nucleus covered with a synthetic polymer associated with an antifouling agent to improve the quality of the pearls obtained, by increasing the homogeneity of the surface of the nucleus, and to reduce the phenomena of rejection and mortality, avoiding for example the colonization of the nucleus by various parasites.
- US Pat. No. 6,514,614 describes the coating of the nucleus by a water-soluble polymer, associated with a substance having an antibacterial activity, said polymer being partially dissolved by seawater (the dissolution rate being greater than 25%) to allow an effective decrease friction and resistance to insertion of said nucleus.
- Japanese patent application JP03183424 describes a system for coating the nucleus with a water-soluble polymer (or any other compound allowing a delayed administration), allowing the administration at a controlled rate of an antibiotic associated with said polymer.
- the inventor has noticed that the coating of the nucleus with a polyhydroxyalkanoate (PHA) film, a natural, biodegradable and non-water-soluble polymer, makes it possible to reduce the failure rate of the grafting operations, and to improve the quality of the pearls obtained.
- PHA polyhydroxyalkanoate
- the inventors propose that the embedding of the nucleus by a PHA film would make it possible to homogenize the surface of the nucleus, thus limiting the presence of surface irregularities on the bead.
- PHAs could limit the adhesion of bacteria to the nucleus, and bacterial growth.
- This intrinsic effect of the PHA coupled with the association of said PHA film with bactericidal or bacteriostatic agents, such as for example antimicrobial peptides (PAM), would thus reduce the occurrence of microbial contaminations.
- PHA antimicrobial peptides
- the presence of PHA alone or in combination with a bactericidal or bacteriostatic agent would then reduce the failures of the graft stage, and in particular to reduce the mortality of recipient oysters and the rejection of nucleus by said oysters.
- the present invention relates to a core coated or coated with a film comprising one or more polyhydroxyalkanoates (PHAs).
- said PHA is an HB polymer (PHB), an HV (PHV) polymer or HB-HV copolymer (PHB-V).
- the present invention also relates to a PHA, characterized in that it is of the PHB-V type, in which the HB / HV ratio is greater than or equal to 50/50 and less than 70/30.
- the present invention further relates to a composition and a film comprising or consisting of a PHA as described above.
- Another object of the present invention is a composition or film comprising a PHA and zosteric acid.
- composition or film comprising a PHA and one or more bioactive molecules, chosen from cicatrizing or anti-inflammatory agents and bactericidal or bacteriostatic agents, such as, for example, chemical antibiotics and antimicrobial peptides.
- the present invention also relates to the use of a film as described above, for covering a surface, said surface being a pearl culture nucleus or a surface brought into contact, preferably in repeated or prolonged contact, with water, such as for example seawater or fresh water, said surface being, for example, the surface of a tank, for example a plastic or metal tank, used in aquaculture , preferably in fish farming, or the supports and ropes used during the breeding of oysters.
- Another object of the present invention is therefore a surface covered with a film as described above, said surface preferably being a nucleus.
- the present invention also relates to a method for protecting surfaces, comprising covering, coating or coating said surface with a film as described above.
- the present invention further relates to a method of obtaining a nucleus as described above, said method comprising a first step of immersing the nucleus in a solution comprising one or more PHA at a concentration of 0.1 to 10. % by weight relative to the volume of the solution, in trifluoroethanol, said first step possibly being followed by a second step consisting in immersing the nucleus in a solution comprising one or more bactericidal or bacteriostatic agents at a concentration of 1 to 10 CMI.
- the present invention also relates to a second method for obtaining a nucleus as described above, said method comprising a single step consisting of immersing the nucleus in a solution comprising PHA at a concentration of 0.05 to 10% by weight. weight in relation to the total volume of the solution and a or several bactericidal or bacteriostatic agents at a concentration of 1 to 10 CMI in trifluoroethanol.
- Another object of the invention is a third method for obtaining a nucleus as described above, said method comprising a single step consisting in the use of a spray for spraying a composition as described above using a spray on the nucleus.
- the present invention therefore also relates to a spray comprising or consisting of a composition as described above.
- Another object of the invention is an oyster comprising a nucleus as described above or obtained by one of the methods of the invention.
- Yet another object of the invention is a method of grafting a recipient pearl oyster comprising inserting into the pearling pouch the recipient pearl oyster of a graft, corresponding to oyster mantle epithelium. donor, in combination with a nucleus as described above or obtained by one of the methods as described above.
- the present invention also relates to a method of manufacturing a pearl culture pearl, comprising the grafting method described above.
- the present invention further relates to a bead obtained by the method of manufacturing a bead as described above, or comprising the nucleus according to the invention, or comprising the film according to the invention in one or more thicknesses of nacre.
- Another subject of the invention is a process for improving the quality of the pearl and / or reducing the failure of a recipient oyster to transplant to a nucleus, said failure corresponding to a mortality or rejection of the nucleus by the recipient pearl oyster, and said method comprising transplanting the recipient oyster with a nucleus as described above.
- the present invention also relates to the use of the nucleus according to the invention, for reducing the failure of grafting and / or improving the quality of the pearl obtained. [Detailed description]
- pearl production results from the deposit of nacre on a nucleus inserted into the recipient oyster during the grafting stage.
- the nucleus transplantation stage generally has a high failure rate, due to poor healing of the recipient oyster at the incision made during the transplant, or bacterial contamination.
- the nuclei used in pearl farming are more and more often covered with a coating making it possible to reduce the failure of the grafting step, and to guarantee the homogeneity of the surface of the nucleus, resulting in a pearl of high quality. .
- the present invention thus relates to a nucleus coated or coated with a film comprising one or more polyhydroxyalkanoates (PHA).
- PHA polyhydroxyalkanoates
- the PHA film is continuous around the nucleus.
- the PHA film has a thickness of 0.1 to 200 ⁇ , preferably from 1 to 100 ⁇ , more preferably from 5 to 50 ⁇ .
- Bacterial PHAs are natural polyesters, 100% biodegradable and derived from renewable resources. These biopolymers are accumulated in bacterial cells in the form of granules when a nutrient necessary for bacterial growth becomes limiting in the presence of an excess of carbon substrate.
- the physicochemical properties of PHAs depend on their chemical composition, which is itself influenced by the nature of the carbon source used for bacterial growth and PHA synthesis. These biopolymers can be produced on an industrial scale and, by a complex composition specific to each microorganism, possess rheological, physicochemical and biological properties conferring them with applications in many industrial sectors. Among these properties, one can notably note the adhesive and film-forming properties.
- PHAs also have the advantage of not being soluble in water.
- PHAs are polyester type polymers consisting of the repetition of the monomeric unit below: wherein R is an alkyl or alkenyl group of variable size, and m and n are integers, preferably m is 1 or 2, more preferably m is 1.
- PHA can be divided into 3 classes: PHAscl (short chain lenght) consisting of hydroxyalkanoic acids containing up to 5 carbon atoms, PHAmcl (medium chain lenght) whose monomeric units have 6 to 12 carbon atoms, and long-chain lenght (PHAIl) whose constituent units have 12 to 16 carbons.
- PHAscl short chain lenght
- PHAmcl medium chain lenght
- PHAIl long-chain lenght
- the PHAs used in the invention are obtained by fermentation of bacteria from microbial mats.
- said PHAs are synthesized under controlled conditions (nutritional and energy imbalance generated by the limitation of an element necessary for bacterial growth in the presence of an excess of a carbon source) during the fermentation of bacteria from microbial mats.
- these PHAs are chosen from those synthesized by bacteria of the genus Pyrococcus sp, Vibrio sp, Alteromonas sp, Pseudomonas sp or Pseudoalteromonas sp, according to the taxonomy in force on the day of the present invention. If the taxonomy were to be modified, one skilled in the art could adapt the taxonomy modifications to deduce the PHAs used in the invention.
- these bacteria are heterotrophic bacteria, aerobic, mesophilic.
- the PHA producing bacteria used in the invention are cultured for 1 to 5 days, preferably for 2 to 4 days, more preferably for about 3 days on a nitrogen-depleted and enriched medium. as a carbon source under the following conditions: salinity 35 o, temperature 30 ° C, pH 7.6.
- the culture medium of the bacteria contains one or more carbon sources of carbohydrate or fatty acid nature.
- the carbon source (s) are selected from the group comprising glucose, glycerol, acetate, benzoate, octanoate, pyruvate, propionate, valerate, and their derivatives. mixtures.
- the total concentration of carbon sources in the culture medium varies from 1 to 30 g / l, preferably from 5 to 20 g / l, more preferably is approximately 10 g / l. L.
- the nature of the PHA produced by the producing bacteria varies according to the concentration of carbon source, the type of carbon source used, and, in the case of a mixture, according to the ratio of the different sources used.
- the PHAs used in the invention are extracted from the producing bacteria by a method comprising the extraction of the bacterial pellet by using organic and / or inorganic solvents, preferably organic solvents.
- the PHAs are recovered by extraction using a solvent selected from the group comprising chloroform and dichloromethane, followed by precipitation of the PHA polymer in ethanol.
- the PHAs used in the invention are short-chain PHAs.
- the short-chain PHAs consist of hydroxybutyric acid (HB) and / or hydroxyvaleric acid (HV) monomers.
- Examples of short chain PHA are PHB (polyhydroxybutyrate), wherein R is CH 3 and m is 1 and PHB-V (poly (hydroxybutyrate-co-hydroxyvalerate)), wherein R is CH 3 or CH 2 - CH 3 and m is 1.
- the PHA used in the invention is chosen from the group comprising polymers of HB (PHB), polymers of HV (PHV) and co-polymers HB-HV (PHB-V ).
- Another subject of the invention is a PHB-V type PHA, in which the HB / HV ratio is greater than or equal to 50/50 and less than 70/30.
- Another subject of the invention is a PHB-V type PHA, in which the HB / HV ratio is greater than or equal to 50/50 and less than 65/35.
- Another object of the invention is a PHB-V type PHA, in which the HB / HV ratio is greater than or equal to 50/50 and less than 60/40.
- Another subject of the invention is a PHB-V type PHA, in which the HB / HV ratio is greater than or equal to 50/50 and less than 55/45.
- Another subject of the invention is a PHB-V type PHA, in which the HB / HV ratio is equal to 50/50.
- Another subject of the invention is PHA-PH PHA, in which the ratio HB / HV is equal to 64/36.
- the PHB-V according to the invention has adhesive and / or filmogenic properties.
- the PHB-V according to the invention is not soluble in water.
- the PHB-V of the invention is obtained by fermentation of bacteria derived from microbial mats, preferably marine bacteria derived from microbial mats.
- the PHB-V of the invention is synthesized under controlled conditions (nutritional and energy imbalance generated by the limitation of an element necessary for bacterial growth in the presence of an excess of a carbon source) during the fermentation of microbial carpet bacteria.
- this PHB-V is chosen from those synthesized by bacteria of the genus Pyrococcus sp, Vibrio sp, Alteromonas sp, Pseudomonas sp or Pseudoalteromonas sp according to the taxonomy in force on the day of the present invention. If the taxonomy were to be modified, one skilled in the art could adapt the taxonomy changes to deduce the PHB-Vs of the invention.
- these bacteria are heterotrophic bacteria, aerobic, mesophilic.
- the PHB-V producing bacteria according to the invention are cultured on a medium depleted in nitrogen and enriched in a carbon source under the following conditions: salinity 35 ° C., temperature 30 ° C., pH 7.6.
- the PHB-V according to the invention is extracted from producing bacteria by a method comprising the extraction of the bacterial pellet by use of organic and / or inorganic solvents, preferentially organic.
- the PHB-V is recovered by extraction with a solvent selected from the group comprising chloroform and dichloromethane, followed by precipitation of the PHA polymer in ethanol. .
- An object of the invention is a composition comprising or consisting of a PHB-V as described above.
- Another subject of the invention is a film comprising or consisting of a PHB-V according to the invention.
- said PHB-V film has a thickness of 0.1 to 200 ⁇ , preferably from 1 to 100 ⁇ , more preferably from 5 to 50 ⁇ .
- Yet another object of the invention is a film comprising or consisting of a PHB-V according to the invention for covering a surface.
- said surface is a pearl culture nucleus.
- said surface is a surface brought into contact, preferably in repeated or prolonged contact, with water, such as for example sea water or water. pure water.
- said surface may be, for example, the surface of a tank, for example a plastic or metal tank, used in aquaculture, preferably in fish farming.
- the surfaces covered with a film comprising or consisting of a PHB-V according to the invention are used in the context of pearl farming, such as, for example, the supports and ropes used during oyster farming.
- Another object of the invention is a method of protecting the surfaces, comprising covering, coating or coating said surface with a film comprising or consisting of a PHB-V according to the invention.
- the recovery, coating or coating of the surface to be protected would prevent the formation of a primary biofilm, and consecutively an undesirable bacterial biofilm on said surface.
- said surfaces are chosen from those mentioned above.
- composition or film of PHB-V according to the invention may be useful for inhibiting bacterial growth.
- PHB and PHB-V are degraded to ⁇ -hydroxybutyric acid by the action of bacterial and fungal depolymerases, by the animal tissues or under alkaline or acid conditions.
- hydroxybutyric acid is a short-chain volatile fatty acid with an inhibitory effect on bacterial growth (Van Immerseel, 2003 and Defoirdt, 2007).
- Short-chain volatile fatty acids (including hydroxybutyric acid) would be able to cross the cell membrane of bacteria and dissociate in the alkaline medium of the cytoplasm, thereby increasing the intracellular proton concentration.
- bacterial cells would use energy to maintain their intracellular pH at an optimal level. This energy could not be used for other metabolic processes, so cell growth is inhibited.
- the inventor proposes the hypothesis according to which, once the nucleus coated with a PHB-V film according to the invention is introduced into the recipient oyster, the tissues of said oyster would degrade the PHB-V in hydroxybutyric acid, thereby inhibiting bacterial growth.
- the PHA (s), in particular the PHB-V (s) according to the invention are native.
- the PHA (s), in particular the PHB-V (s) according to the invention may be chemically or physically modified.
- the PHA used in the invention is modified by addition of group (s) sulfate, sulfonate, acetate, lactate, succinate, pyruvate, or groups that modify the hydrophobic / hydrophilic balance of the resulting PHAs. preferably said groups are selected from the group consisting of epoxide, alcohol, carboxylic acid groups.
- the PHA used in the invention is modified by depolymerization to obtain polymers of lower molecular weight.
- the PHA used in the invention is modified by grafting a polymer, preferably an oligomer, such as for example an exopolysaccharide (EPS).
- EPS exopolysaccharide
- exopolysaccharides can be defined as macromolecules formed from the sequence of similar carbohydrates (commonly called sugars or dares). These exopolysaccharides can be produced at industrial scale, and possess, among other properties, adhesive properties (related to the function of these molecules in nature) and film-forming properties.
- EPS can be produced by many microorganisms such as gram-positive or gram-negative bacteria, archaea, fungi, and some algae.
- EPS are produced by gram-positive or gram-negative bacteria, archeae or algae.
- EPS can be extracted from microorganism cultures by well-known physical or chemical extraction methods such as sonication, centrifugation, alkaline treatment, ethanol extraction, enzymatic extraction, etc.
- the EPS can be chosen from those produced by marine organisms such as Bacillus, Halomonas, Planococcus, Enterobacter, Alteromonas, Pseudoalteromonas, Rhodococcus, Zoogloea, Cyanobacteria, Vibrio, as described in Satpute et al. . (Biotechnology Advances 2010, 28: 436-450). If the taxonomy were to be modified, one skilled in the art could adapt the taxonomy changes to deduce the EPS that can be used in the invention.
- EPS can be obtained by fermentation of bacteria from deep hydrothermal ecosystems. More particularly, these EPS are those synthesized under controlled conditions (nutritional imbalance generated by a high carbon / nitrogen ratio due to a carbohydrate enriched nutritional medium) during the fermentation of bacteria from deep hydrothermal ecosystems (see for example Guezennec, J. (2002), Deep Sea Hydrothermal Winds: A Novel Source of innovative Bacterial Exopolysaccharides of Biotechnological Interest (Journal of Industrial Microbiology & Biotechnology 29: 204-208).
- the EPSs are chosen from HE 800, EPS 721, M0245, GG1, HYD 657, HYD 1644, HYD 1545, GY 785, MS 907, ST 716, HYD 721, GY 772, HYD 750, GY 768, GY 788, BI746, GY 786, GY 685, GY 686, ST 719, HYD 1574, HYD 1579, HYD 1582, HYD 1584, ST 708, ST 722, ST 342, ST 349, HYD 1625, and HYD 1666, preferably MO 245, HE 800, GG1, HYD 721 and ST 716.
- the EPSs are native.
- the EPS can be chemically or physically modified (as for example by adding group (s) sulfate, acetate, lactate, succinate or pyruvate).
- a nucleus covered with a PHA film decreases the mortality of recipient oysters following the graft.
- a PHA film preferably PHB-V according to the invention
- the inventor suggests that the presence of a PHA film on the surface of the nucleus modifies the physico-chemical properties of the surface, limiting the formation of a primary biofilm, and consequently that of unwanted biofilm.
- the presence of an unwanted biofilm on the surface of the nucleus could result in bacterial contamination of the oyster tissue, and mortality of the oyster.
- composition or a film comprising or consisting of one or more PHAs, preferably one or more PHB-Vs according to the invention, combined with an agent enhancing the formation inhibition of the biofilms of the PHA, preferably said agent is zosteric acid.
- Zosteric acid is described as allowing the prevention of biofilm formation on surfaces (US5384176, US607741, incorporated by reference).
- the association between the PHA film and the agent or agents described above results from an adsorption phenomenon or a chemical reaction between the PHAs and said agents.
- zosteric acid is native.
- the zosteric acid may be a chemically modified derivative, preferentially a zosteric acid derivative is a zosteric acid ester as described in US2007 / 128151, incorporated by reference.
- the zosteric acid derivative is an acid derivative of zosteric acid.
- zosteric acid is extracted from the seaweed Zostera marina.
- Another subject of the invention is a film comprising or consisting of one or more PHAs, preferably one or more PHB-Vs according to the invention combined with an agent reinforcing the inhibition of formation of the biofilms of the PHA (s), preferably zosteric acid to cover a surface.
- said surface is a nucleus
- said surface is a surface brought into contact, preferably in repeated or prolonged contact, with water, such as for example sea water or water. pure water.
- said surface may be, for example, the surface of a tank, for example a plastic or metal tank, used in aquaculture, preferably in fish farming.
- the surfaces covered with a film comprising or consisting of a PHB-V according to the invention are used in the context of pearl farming, such as, for example, the supports and ropes used during oyster farming.
- Another object of the invention is a method of protecting the surfaces, comprising covering, coating or coating said surface with a film comprising or consisting of one or more PHAs, preferably one or more PHB-Vs according to the invention. the invention, combined with an agent enhancing the formation inhibition of biofilms of the PHA or, preferably zosteric acid as described above.
- the recovery, coating or coating of the surface to be protected would prevent the formation of a primary biofilm, and consecutively an undesirable bacterial biofilm on said surface.
- said surfaces are chosen from those mentioned above.
- composition or a film comprising or consisting of one or more PHAs, preferably one or more PHB-Vs according to the invention, associated with one or more bioactive molecules.
- the association between the PHA film, preferably one or more PHB-Vs according to the invention, and the bioactive molecule (s) results from an adsorption phenomenon or a chemical reaction between PHA and said molecules.
- these bioactive molecules are cicatrizing or anti-inflammatory agents such as collagen, fibrinogen, laminin, or growth factors.
- a healing or anti-inflammatory agent on the nucleus could accelerate the cicatrization of the incision performed during the transplant, or limit inflammation, a phenomenon that could lead to the death of Oyster.
- these bioactive molecules are bactericidal or bacteriostatic agents.
- bactericidal or bacteriostatic agents In pearl farming, the addition of a bactericidal or bacteriostatic agent on the nucleus would make it possible to limit the occurrence of bacterial contamination in the recipient oyster, which could lead to a rejection of the nucleus or to the death of the oyster.
- the bactericidal or bacteriostatic agents are chosen from chemical antibiotics such as, for example, tetracycline, kanamycin, sulfamonomethoxyne ampicillin.
- the bactericidal or bacteriostatic agents are chosen from antimicrobial peptides (PAM).
- PAM antimicrobial peptides
- MAPs Antimicrobial peptides
- WFP wide variety of WFP has been identified in recent years, revealing a great diversity in terms of structures, sizes and modes of action.
- MAPs are generally characterized by a high representativeness in cationic and hydrophobic amino acids. These molecules are most often amphiphilic essential for their interaction with bacterial membranes (Bulet et al., 2004).
- PAMs kill microorganisms, either by permeabilizing their membrane by a detergent-like effect or by the formation of pores, by blocking the synthesis of peptidoglycan component of the bacterial wall, or by the inhibition of bacterial metabolic pathways (Brodgen 5 et al., 2005).
- PAM Compared to the generally used chemical antibiotics, PAM has the advantage of being completely biodegradable. They appear to be good candidates for replacing conventional chemical antibiotics because of their biological properties. Indeed, they have a broad spectrum of antimicrobial activity, little specificity, different modes of action, a safety on the environment.
- PAM can be produced by chemical synthesis or expression in recombinant system (cloning, expression, purification) bacterial or yeast.
- the PAMs are synthesized by chemical synthesis.
- the PAMs are synthesized by biological synthesis in a bacterial or fungal recombinant system and preferably in a yeast system.
- PAM may belong to the family of alpha-helical linear PAMs, to the family of PAMs with overrepresentation in one or more amino acids, to the family of hairpin PAMs (beta Hairpin) with 1 or 2 disulfide bridges to the family of beta cyclic PAM and alpha helix with 3 or more disulfide bridges (Bulet et al., Immunological reviews, 2004, 198: 169-184; Brogden, Nature Review Microbiology, 2005, 3: 238-250).
- linear alpha-helical PAM examples include, but are not limited to, cecropin, stomoxyne, ponericin, spinigerin, oxyopinin, cupienin, clavanin, styeline, pardaxine, misgurine, pleurocidin, parasin, oncorhyncin, moronecidin, magainin, temporin, cathelicidin, indolicidin.
- PAM enriched in one or more amino acids, proline, arginine, glycine, or tryptophan include, but are not limited to, bactenicins, PR-39, abaecins, apidaecins, drosocine, pyrrhocoricins, Cg-Prp, prophenine, indolicin .
- hairpin PAM containing 2 to 4 cysteines include, but are not limited to, tachyplesin, protrinin, thanatin, androctonin, gomesin, polyphemusin, hepcidin, brevinin, esculentine, tigerinine or bactenecine.
- cyclic PAMs containing 6 or more cysteine or open-cycle residues include, but are not limited to, defensins (vertebrates, invertebrates) or plants), proin, heliomicine, drosomycin, ASABF, pBD, penaeidines, ALF, big-defensins.
- invertebrate defensins examples include Cg-Defs oyster defensins or MGD defensins.
- the PAM is chosen from tachyplesin and oyster defensins Cg-Defs.
- Another subject of the invention is a film comprising or consisting of one or more PHAs, preferably one or more PHB-Vs according to the invention, associated with one or more bioactive molecules, as described above for covering a surface. .
- said surface is a nucleus
- said surface is a surface brought into contact, preferably in repeated or prolonged contact, with water, such as for example sea water or water. pure water.
- said surface may be, for example, the surface of a tank, for example a plastic or metal tank, used in aquaculture, preferably in fish farming.
- the surfaces covered with a film comprising or consisting of a PHB-V according to the invention are used in the context of pearl farming, such as, for example, the supports and ropes used during oyster farming.
- the film comprising PHA, preferably PHB-V according to the invention, optionally associated with biactive molecules or with an agent reinforcing the inhibition of formation of the biofilms of the PHA or preferably zosteric acid is resistant to washing with seawater and is stable for more than 3 weeks, preferably more than one month, more preferably more than 6 months at temperatures ranging between 4 and 30 ° C.
- the film according to the invention does not dissolve when placed in contact with seawater for at least 3 weeks.
- the present invention also relates to a process for obtaining a nucleus coated or coated with a film comprising one or more polyhydroxyalkanoates (PHA), preferably PHB-V according to the invention, said film being able to be associated with biactive molecules or an agent enhancing inhibition of biofilm formation of the PHA (s), preferably zosteric acid, as described above.
- PHA polyhydroxyalkanoates
- the method according to the invention comprises a first step consisting in coating the nucleus with the PHA film, preferably with the PHB-V film according to the invention, optionally followed by a second step of combining the PHA film formed with one or more other molecules as described above.
- said method comprises a first step of immersing the nucleus in a solution comprising one or more PHA, preferably one or more PHB-V according to the invention, in trifluoroethanol (CF 3 CH 2 OH, TFE).
- a solution comprising one or more PHA, preferably one or more PHB-V according to the invention, in trifluoroethanol (CF 3 CH 2 OH, TFE).
- said PHA solution has a PHA concentration of 0.1 to 10% w / v, more preferably 0.5 to 5, still more preferably 1% by weight of PHA per volume of the PHA. TFE solution.
- said first step of immersing the nucleus in a solution containing one or more PHAs is carried out at a constant temperature, preferably at room temperature (ie from 15 to 25 ° C.), more preferably approximately 20 ° C.
- said first step of immersing the nucleus in a solution containing one or more PHAs is preferably carried out for 10 minutes to 3 hours, more preferably for 20 minutes to 1 hour, still more preferably about 30 minutes. minutes.
- said first step of immersing the nucleus in a solution containing one or more PHAs is carried out at a constant temperature, preferably from 1 to 10 ° C, more preferably about 4 ° C.
- said first step of immersing the material in a solution containing one or more PHAs is carried out preferably for 10 minutes to 3 hours, more preferably for 20 minutes to 1 hour, even more preferably for about 30 minutes.
- the coated nucleus is then dried under vacuum.
- the first step described above is followed by a second step of association of said molecules.
- the second step comprises immersing the PHA film-coated nucleus in a solution comprising one or more bactericidal or bacteriostatic agents at a concentration. from 1 to 10 CMI.
- the bactericidal or bacteriostatic agent is in solution in a biologically acceptable polar solvent such as water, ethanol, TFE or their mixture, for example water / TFE, preferably trifluoroethanol (CF 3 CH 2 OH).
- a biologically acceptable polar solvent such as water, ethanol, TFE or their mixture, for example water / TFE, preferably trifluoroethanol (CF 3 CH 2 OH).
- the second nucleus immersion step is carried out at a constant temperature, preferably from 1 to 10 ° C, more preferably about 4 ° C.
- said second nucleus immersion step is preferably carried out for 1 to 120 hours, more preferably for 12 to 96 hours, even more preferably for 24 to 72 hours.
- the coated nucleus is then dried under vacuum.
- said method optionally comprises a step of rinsing the nucleus between the first immersion step and the second immersion step.
- the nucleus is rinsed with a volume of 10 to 1000 ml of distilled water, preferably 100 to 300 ml of distilled water, more preferably about 200 ml of distilled water.
- the subject of the invention is also a process for obtaining a nucleus coated with a film comprising one or more PHAs, preferably one or more PHB-Vs according to the invention, and one or more other molecules, such as for example one or more biomolecules, for example one or more bacteriostatic or bactericidal agents, said method comprising a single step of immersing the nucleus in a solution comprising PHA and bacteriostatic or bactericidal agents in TFE.
- the PHA are present in the solution at a concentration of 0.05 to 10% by weight relative to the total volume of the solution, preferably from 0.1 to 5, more preferably at a concentration of 1%.
- the bactericidal or bacteriostatic agents are present in the solution at a concentration of 1 to 10 CMI.
- this immersion step is carried out at a constant temperature of 1 to 10 ° C., preferably 4 ° C., and for 1 to 128 hours, preferably for 12 to 96 hours, and more preferably for 24 to 72h.
- the present invention also relates to a process for coating a nucleus with a film comprising one or more PHAs, preferably one or more PHB-Vs according to the invention, optionally in combination with one or more molecules selected from the group consisting of agents enhancing the action of inhibiting the formation of PHA biofilms, preferably zosteric acid and bioactive molecules, such as cicatrizing or anti-inflammatory agents, and bacteriostatic or bactericidal agents, preferably PAM, comprising the use of a spray for spraying the composition according to the invention on the surface of the nucleus.
- the present invention relates to a spray comprising or consisting of PHA, preferably comprising or consisting of PHB-V according to the invention.
- the present invention relates to a spray comprising or consisting of one or PHA, preferably one or more PHB-V according to the invention in combination with one or more other molecules selected from the group comprising agents enhancing the action of inhibition of the formation of biofilms PHA, preferably the acid zosteric and bioactive molecules, such as healing or anti-inflammatory agents, and bacteriostatic or bactericidal agents, preferably PAM.
- agents enhancing the action of inhibition of the formation of biofilms PHA preferably the acid zosteric and bioactive molecules, such as healing or anti-inflammatory agents, and bacteriostatic or bactericidal agents, preferably PAM.
- the nucleus is of natural origin, more preferably said nucleus is in Mississippi mother-of-pearl belonging to the genus Amblema sp., Preferably Amblema plicata.
- nucleus are those sold by Aming (Standard Aming) or by Poe Import.
- said nucleus has a diameter of 1 to 20 mm, preferably 2 to 15 mm, more preferably 2 to 4 mm, and even more preferably 2.1 to 3.5 mm.
- said nucleus has a diameter of 2 to 2.5 BU, preferably about 2.4 BU.
- the BU is a unit of measurement, 1BU corresponding to 3.03 mm.
- the invention also relates to an oyster comprising a nucleus as described above or obtained by a method as described above.
- the oyster belongs to the genus Pinctada sp., More preferably to the species Pinctada fucata, Pinctada maxima, Pinctada margaritifera.
- the subject of the present invention is also a process for grafting a recipient pearl oyster, preferably belonging to the genera and species mentioned above, with a nucleus coated or coated with a PHA film, preferably PHB-V, optionally combined with zosteric acid or a bioactive molecule, as described above.
- Figure 1A shows the different stages of the transplant.
- the grafting method comprises manually opening the recipient pearl oyster, making an incision in the tissues of the recipient pearl oyster, to access the pearl pocket and allow in a third step, insertion into the pearling pocket of the recipient pearl oyster of a graft, corresponding to a portion of the mantle epithelium of the donor oyster (about 4 mm 2 ), in combination with a nucleus coated or covered with a PHA film, preferably PHB-V, as described above .
- the present invention also relates to a method for producing or manufacturing a pearl culture bead, comprising a step of grafting a pearl oyster receiving a nucleus, according to the method described above.
- the present invention also relates to a process for obtaining a bead comprising the use of the coated nucleus as described above, or obtained according to a coating process as described above.
- the process for obtaining a pearl comprises the grafting of a nucleus according to the invention in the pearling pocket of a recipient oyster, in combination with a part of the epithelium of the a donor oyster.
- said process for producing, producing or obtaining a pearl comprises a first step comprising the collection and rearing of pearl oysters, preferably belonging to the genera and species mentioned above, to obtain donor pearl oysters and recipient pearl oysters.
- the donor and recipient pearl oysters are then cleaned to remove any parasites.
- said process for producing, producing or obtaining a pearl further comprises, following the grafting, a step of culturing the recipient pearl oysters, preferably for a period of 10 minutes. at 24 months, preferably from 12 to 20 months, even more preferably from 16 to 18 months.
- the epithelial border of the graft multiplies and lines the pearl pocket, to give a pearl sac encompassing the nucleus, and will deposit layers of mother of pearl around the nucleus, resulting in the production of a pearl ( Figure 1B).
- the present invention also relates to the bead obtained by the process as described above.
- the invention also relates to a bead comprising a core coated according to the invention, or a nucleus obtained by a process according to the invention.
- the present invention also relates to a pearl whose nucleus is covered with a PHA film, optionally in combination with one or more molecules chosen from the group comprising the reinforcing agents for inhibiting the formation of PHA biofilms, preferably zosteric acid and bioactive molecules, such as cicatrizing or anti-inflammatory agents, and bacteriostatic or bactericidal agents, preferably PAM.
- a pearl whose nucleus is covered with a PHA film, optionally in combination with one or more molecules chosen from the group comprising the reinforcing agents for inhibiting the formation of PHA biofilms, preferably zosteric acid and bioactive molecules, such as cicatrizing or anti-inflammatory agents, and bacteriostatic or bactericidal agents, preferably PAM.
- the present invention also relates to a bead comprising a PHA film, preferably PHB-V film according to the invention, optionally in combination with one or more molecules chosen from the group comprising the agents that reinforce the action of inhibition of the formation of PHA biofilms, preferably zosteric acid and bioactive molecules, such as healing or anti-inflammatory agents, and bacteriostatic or bactericidal agents, preferably PAM, in one or more thicknesses of mother-of-pearl.
- a bead comprising a PHA film, preferably PHB-V film according to the invention, optionally in combination with one or more molecules chosen from the group comprising the agents that reinforce the action of inhibition of the formation of PHA biofilms, preferably zosteric acid and bioactive molecules, such as healing or anti-inflammatory agents, and bacteriostatic or bactericidal agents, preferably PAM, in one or more thicknesses of mother-of-pearl.
- the bead has a size, preferably a diameter of 2 to 20 mm, preferably 5 to 15 mm, even more preferably 6.8 to 10 mm.
- the coating of the nucleus by a film of PHA, preferably of PHB-V according to the invention, optionally combined with one or more molecules chosen from the group comprising agents which enhance the action of inhibition of the formation of PHA biofilms, preferably zosteric acid and bioactive molecules, makes it possible to reduce the failure rate of grafting operations.
- the use of a coated nucleus according to the invention decreases the mortality rate of the recipient oysters within 30 days post-transplant and increases the rate of maintenance of the nucleus in the recipient oyster (Example 3).
- the inventors propose that embedding the nucleus with said film would make it possible to reduce bacterial contaminations within the recipient oyster.
- PHA film with bactericidal or bacteriostatic agents, such as antimicrobial peptides (PAM), would further reduce the occurrence of microbial contamination.
- PHA antimicrobial peptides
- the present invention therefore also relates to a method for reducing the failure of transplantation of a recipient oyster by a nucleus, said failure corresponding to a mortality or rejection of the nucleus by the recipient pearl oyster, and said method comprising transplanting the recipient oyster with a PHA-coated or PHA coated nucleus, preferably PHB-V according to the invention, as described above.
- the present invention also relates to the use of a PHA-coated or PHA-coated nucleus, preferably PHB-V as described above for reducing transplant failure of a recipient oyster by a nucleus, said failure corresponding to mortality or rejection of the nucleus by the recipient pearl oyster.
- the present invention also relates to a method of inhibiting the rejection of the nucleus during the graft, said method comprising the use of a coated nucleus according to the invention during the grafting.
- the present invention further relates to a method of reducing the mortality of recipient oysters following the grafting step, comprising using a coated nucleus according to the invention during grafting.
- the mortality prevented by the method of the invention is due to an infection of the incision made during the graft.
- the coating of the pearl culture nucleus with a PHA film, preferably PHB-V, optionally combined with one or more molecules selected from the group comprising the PHA biofilm formation inhibiting enhancer, preferably zosteric acid and bioactive molecules, as described above would improve the homogeneity of the nucleus surface, and thus improve the quality of the pearl obtained by limiting the appearance of surface defects.
- the present invention also relates to a method for improving the homogeneity of a nucleus, comprising coating said nucleus with a film as described in the present invention.
- the subject of the present invention is therefore also a process for improving the quality of the pearl obtained following the grafting of the recipient pearl oyster, said method comprising the use of a nucleus coated with or covered with PHA, preferably PHB-V, as described above.
- the present invention also relates to the use of a PHA-coated or PHA-coated nucleus, preferably PHB-V, as described above to improve the quality of the pearl obtained.
- nucleus an element, generally spherical, formed of a natural compound (for example in Mississipi mold nacre, Amblema plicata) or synthetic (for example Bironite) introduced into the recipient oyster during the graft stage, and serving as a support for the nacre deposit by the recipient pearl oyster.
- Said nucleus may be coated with particular substances to improve the quality of the pearl obtained.
- pearl culture human activity for pearl oyster culture pearl production generally belonging to the genus Pinctada sp.
- bactericidal agent is meant a substance having a bactericidal action, i.e. resulting in the death of bacteria.
- bacteriostatic agent is meant a substance having a bacteriostatic action, i.e. blocking the development, growth and / or division of bacteria.
- primary film is meant a conditioning film composed of proteins or protein fragments, carbohydrates, lipids, mineral materials such as mineral salts, from the surrounding environment. This primary film stimulates bacterial adhesion.
- unwanted biofilm is meant a film of microorganisms, usually bacteria, which cling to the primary film, in a first reversible and then irreversible adhesion step.
- MIC is meant the minimum concentration from which an agent inhibits the visible growth of a microorganism after overnight incubation.
- the methods for determining the MIC of an agent are well known in the state of the art.
- aquaculture all human activities of animal or plant production in the aquatic environment, particularly in marine, river or water.
- Aquaculture concerns in particular the production of fish (we speak of fish farming), shellfish (shellfish or pearl farming in particular), crustaceans (astaciculture and peneticulture in particular), or even seaweed (seaweed farming).
- mother-of-pearl is meant a biomineralized structure formed of aragonite crystals (constituting nearly 90% of the nacre) and conchyoline; aragonite being a chemical compound of formula CaCO 3 + traces of Sr; Pb; Zn.
- Figure 1 is a diagram showing the different stages of grafting and pearl formation.
- A Registry.
- B Formation of pearl bag and pearl within the pearl pocket (Illustration C. Montagnani).
- Figure 2 is an assembly of photos obtained by scanning microscopy, uncoated (a) and coated (b and c) nuclei.
- the marks correspond to voluntary tearing to reinforce the presence of the film.
- Nuclei were coated with a film comprising bacterial PHB-V FAK1402.
- FAK1402 is a PHB-V PHA in which the HB / HV ratio is 64/36. These nuclei were obtained by immersing for 10 min at a constant temperature of 20 ° C in a TFE solvent supplemented with FAK1402 resulting from biotechnological fermentation processes at a concentration of 1% w / v, followed by vacuum drying.
- Figure 2 obtained by scanning microscopy unambiguously shows the presence of a film.
- Figure a shows an uncoated nucleus.
- Figures b and c show the presence of the film after a tear, respectively without washing and after washing with water.
- Standard diameter nuclei were used for studies of the influence of pretreatment of surfaces with bacterial PHA film.
- the nuclei are coated with a film comprising PHB-V FAK1402 alone or in combination with tachyplesin (PAM).
- PAM tachyplesin
- a conventional bacterial growth inhibition test was performed on these nuclei: the nuclei were brought into contact with a bacterial solution in the exponential phase of growth of the Vibrio strain isolated from Pinctada margaritifera during a transplant in Tahiti for 18 hours at 30 ° C. The bacterial solution is then spread on petri dish (Zobell Agar medium) and the colonies developed are then counted. Uncoated nuclei are used as negative controls.
- nucleus uncoated or coated with polyhydroxyalkanoate film FAK1402 alone showed no inhibitory effect on bacterial growth.
- nuclei coated with an antimicrobial peptide associated with a polyhydroxyalkanoate film FAK1402 showed a bactericidal activity.
- Uncoated or PHA-coated nuclei of the invention (PHB-V in which the HB / HV ratio is 64/36), alone or in combination with a PAM (tachyplesin) were grafted to oysters recipients in combination with part of the mantle epithelium of a recipient oyster (graft). 64 donor oysters were used for this experiment. 8 transplant experiments were performed by nucleus type and donor.
- PHA or PHA + PAM film inhibits oyster mortality by almost 20% and 30%, respectively.
- Uncoated or PHA-coated nuclei of the invention (PHB-V in which the HB / HV ratio is 64/36) alone or in combination with a PAM (tachyplesin) have been used in experiments. graft as described above.
- the presence of the PHA or PHA + PAM film increases the maintenance of nuclei in the recipient oyster by more than 6.5%.
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- Marine Sciences & Fisheries (AREA)
- Zoology (AREA)
- Animal Husbandry (AREA)
- Biodiversity & Conservation Biology (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
- Farming Of Fish And Shellfish (AREA)
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Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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CN201180067437.1A CN103491769A (zh) | 2010-12-14 | 2011-12-14 | 覆盖有pha的核心 |
JP2013543863A JP2014501522A (ja) | 2010-12-14 | 2011-12-14 | Phaで覆われた核 |
AU2011343067A AU2011343067A1 (en) | 2010-12-14 | 2011-12-14 | Nucleus covered with PHA |
US13/993,863 US20130263793A1 (en) | 2010-12-14 | 2011-12-14 | Nucleus covered with pha |
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FR1060461 | 2010-12-14 | ||
FR1060461A FR2968506B1 (fr) | 2010-12-14 | 2010-12-14 | Nucleus recouvert de pha |
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WO2012080660A1 true WO2012080660A1 (fr) | 2012-06-21 |
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PCT/FR2011/052987 WO2012080660A1 (fr) | 2010-12-14 | 2011-12-14 | Nucléus recouvert de pha |
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US (1) | US20130263793A1 (fr) |
JP (1) | JP2014501522A (fr) |
CN (1) | CN103491769A (fr) |
AU (1) | AU2011343067A1 (fr) |
FR (1) | FR2968506B1 (fr) |
WO (1) | WO2012080660A1 (fr) |
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CN105284673B (zh) * | 2015-06-07 | 2018-03-27 | 福建师范大学 | 一种旧珍珠翻新的方法 |
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- 2011-12-14 US US13/993,863 patent/US20130263793A1/en not_active Abandoned
- 2011-12-14 WO PCT/FR2011/052987 patent/WO2012080660A1/fr active Application Filing
- 2011-12-14 CN CN201180067437.1A patent/CN103491769A/zh active Pending
- 2011-12-14 AU AU2011343067A patent/AU2011343067A1/en not_active Abandoned
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Also Published As
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FR2968506A1 (fr) | 2012-06-15 |
US20130263793A1 (en) | 2013-10-10 |
JP2014501522A (ja) | 2014-01-23 |
AU2011343067A1 (en) | 2013-07-04 |
FR2968506B1 (fr) | 2013-02-08 |
CN103491769A (zh) | 2014-01-01 |
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