EP3743377A1 - Encapsulation de substances actives et/ou de microorganismes dans un materiau lamellaire - Google Patents
Encapsulation de substances actives et/ou de microorganismes dans un materiau lamellaireInfo
- Publication number
- EP3743377A1 EP3743377A1 EP19709998.9A EP19709998A EP3743377A1 EP 3743377 A1 EP3743377 A1 EP 3743377A1 EP 19709998 A EP19709998 A EP 19709998A EP 3743377 A1 EP3743377 A1 EP 3743377A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- compound
- advantageously
- group
- microorganism
- encapsulated
- 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
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Classifications
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/20—Silicates
- C01B33/22—Magnesium silicates
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G5/00—Fertilisers characterised by their form
- C05G5/30—Layered or coated, e.g. dust-preventing coatings
- C05G5/35—Capsules, e.g. core-shell
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D9/00—Other inorganic fertilisers
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D9/00—Other inorganic fertilisers
- C05D9/02—Other inorganic fertilisers containing trace elements
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F11/00—Other organic fertilisers
- C05F11/08—Organic fertilisers containing added bacterial cultures, mycelia or the like
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F11/00—Other organic fertilisers
- C05F11/10—Fertilisers containing plant vitamins or hormones
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/60—Biocides or preservatives, e.g. disinfectants, pesticides or herbicides; Pest repellants or attractants
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/80—Soil conditioners
Definitions
- the present invention relates to the encapsulation in lamellar materials of active substances and / or microorganisms for the growth or treatment of plants.
- the inventors have surprisingly discovered that it is possible to encapsulate such microorganisms and / or active substances in talc or saponite-type synthetic clay during the synthesis of these clays. that is to say in one step, while maintaining the activity of the active substances and microorganisms.
- the present invention therefore relates to a method of encapsulation of a compound selected from the group consisting of at least one active substance, at least one microorganism and their mixtures in an organic-inorganic hybrid material of lamellar structure of type 2: 1, said material having the following general formula I:
- x is a number such that 0 ⁇ x ⁇ 1, 2 and R represents a C 1 -C 30 alkyl group, an aryl group, a C 1 -C 3 alkyl aryl group or an O-C 1 -C 30 alkyl group; the alkyl group may be substituted by a group selected from a phenyl, vinyl, aminopropyl or mercaptopropyl group,
- the present invention thus relates to a method of encapsulation in an organic-inorganic hybrid material of lamellar structure of type 2: 1, said material having the following general formula I:
- x is a number such that 0 ⁇ x ⁇ 1, 2 and
- R is alkyl Cl-C30 / preferably n-hexadecyl group or a methyl group, especially a n-hexadecyl; an aryl group, advantageously a phenyl group; a (C 1 -C 3 ) alkyl aryl group, advantageously an ethylphenyl group; or a C 1 -C 3 O-alkyl group, advantageously an ethoxy group; the alkyl group may be substituted with a group selected from phenyl, vinyl, aminopropyl or mercaptopropyl.
- C 1 -C 30 alkyl group means any linear or branched saturated alkyl group having from 1 to 30 carbon atoms, such as the methyl, ethyl, n-propyl, isopropyl or n-butyl group.
- it is methyl, ethyl, n-propyl, isopropyl or n-hexadecyl, even more preferably methyl, ethyl, or n-hexadecyl, more particularly the ethyl or n-hexadecyl group.
- aryl group in the sense of the present invention one or more aromatic rings having 5 to 20 carbon atoms, which can be contiguous or fused.
- the aryl groups can be monocyclic, bicyclic or polycyclic groups.
- it is phenyl, bi-phenyl, naphthyl, anthracenyl, phenanthrenyl, tetracenyl, chrysenyl, triphenylenyl, pyrenyl, benzofluorenyl, benzopyrenyl.
- it is a phenyl group.
- the source of silicon necessary for the synthesis of the material of formula I is advantageously an organoalkoxysilane or a mixture of organoalkoxysilanes of the following general formula II: RSi (OR 3 (II) in which
- R is as defined above and
- R ' is a methoxy or ethoxy group.
- the silicon source is chosen from the group consisting of:
- PhenylTMS phenyltrimethoxysilane
- TEOS tetraethylorthosilicate or tetraethylsilane
- MTES methyltriethoxysilane
- methyltriethoxysilane methyltriethoxysilane, phenyltrimethoxysilane, tetraethylorthosilicate, hexadecyltrimethoxysilane, triethoxyphenylsilane and their mixtures, more particularly in the group consisting of phenyltrimethoxysilane, tetraethylorthosilicate, triethoxyphenylsilane and hexadecyltrimethoxysilane, and mixtures thereof.
- phenyltrimethoxysilane tetraethylorthosilicate, hexadecyltrimethoxysilane and mixtures thereof.
- it may be in particular a mixture between tetraethylorthosilicate and phenyltrimethoxysilane or between tetraethylorthosilicate and hexadecyltrimethoxysilane or between triethoxyphenylsilane and hexadecyltrimethoxysilane, advantageously it is a mixture between tetraethylorthosilicate and hexadecyltrimethoxysilane or between triethoxyphenylsilane and hexadecyltrimethoxysilane, still more advantageously between tetraethylorthosilicate and hexadecyltrimethoxysilane.
- the compound will therefore be encapsulated within the material of formula I and in particular if its size allows it (of the order of Angstrom) within the interfoliar space of the material (this is the case of tryptophan and folic acid).
- the compound according to the invention is chosen from the group consisting of at least one active substance, at least one microorganism and their mixtures.
- the term "active substance” is intended to mean any organic substance that is biologically active, that is to say any organic substance capable of reacting with living organisms, in particular plants, and therefore having a specific role in metabolism. for example, by acting directly on the plant, or by acting on the soil or the cultivation substrate, or by acting on pests or on the contrary on beneficial organisms.
- This type of substance can thus allow fertilization, nutrition, growth stimulation and / or plant prophylaxis and / or the improvement of the physical, chemical and / or biological properties of the soil or the substrate for growing plants.
- the active substance may be a molecule, but also a plant extract, an algae extract, a humic extract or any other type of extract or co-product.
- the active substance is chosen from the group consisting of an amino acid, in particular tryptophan, a vitamin, in particular folic acid, an essential oil and mixtures thereof, more advantageously in the group consisting of an amino acid, in particular tryptophan, an essential oil and their mixtures advantageously it is tryptophan.
- the compound according to the invention is therefore an active substance. It can also be a mixture of 2, 3 or 4 active substances, in particular of 2 or 3 active substances.
- a single active substance is encapsulated, such as, for example, tryptophan or folic acid.
- the source of silicon necessary for the synthesis of the material of formula I is advantageously phenyltrimethoxysilane or a mixture of organoalkoxysilanes of general formula II, advantageously a mixture of phenyltrimethoxysilane (a) and tetraethylorthosilicate (b).
- the mixture comprises less than 80 mol% of tetraethylorthosilicate and more than 20 mol% of phenyltrimethoxysilane, more preferably less than 60 mol% of tetraethylorthosilicate and more than 40 mol% of phenyltrimethoxysilane, still more advantageously less than 50 mol%. mol% of tetraethylorthosilicate and more than 50 mol% of phenyltrimethoxysilane, relative to the total number of mol of the mixture.
- the mixture comprises between 20 and 60 mol% of tetraethylorthosilicate and between 40 and 80 mol% of phenyltrimethoxysilane, in particular between 20 and 40 mol% of tetraethylorthosilicate and between 60 and 80 mol% of phenyltrimethoxysilane, more particularly 20 mol% of tetraethylorthosilicate and 80 mol% of phenyltrimethoxysilane, relative to the total number of mol of the mixture.
- step a) comprises the following successive steps:
- a source of magnesium advantageously magnesium nitrate hexahydrate, of the active substance, of the silicon source, in the case where x10, of the aluminum source, advantageously aluminum acetylacetonate, and a possible solvent;
- the solvent of step a1) may be a polar solvent such as water, alcohol (in particular ethanol or glycerol), propylene glycol, methyl-5- (dimethylamino) -2-methyl- 5-oxopentanoate (such as RHODISOLV® Polarclean marketed by Solvay), propylene carbonate or mixtures thereof, advantageously water, alcohol (in particular ethanol or glycerol), methyl-5- (dimethylamino) -2-methyl-5-oxopentanoate (such as RHODISOLV® Polarclean marketed by Solvay) or their mixtures, more particularly water, alcohol (in particular ethanol or glycerol) or their mixtures.
- a polar solvent such as water, alcohol (in particular ethanol or glycerol), propylene glycol, methyl-5- (dimethylamino) -2-methyl- 5-oxopentanoate (such as RHODISOLV® Polarclean marketed by Solvay), propylene carbon
- It may be a biobased and / or biodegradable solvent such as glycerol, propylene glycol, methyl-5- (dimethylamino) -2-methyl-5-oxopentanoate (such as RHODISOLV® Polarclean marketed by Solvay) , propylene carbonate or their mixtures, in particular glycerol, methyl-5- (dimethylamino) -2-methyl-5-oxopentanoate (such as RHODISOLV® Polarclean sold by Solvay) or mixtures thereof. It can also be a mixture of alcohol and oil.
- glycerol propylene glycol
- methyl-5- (dimethylamino) -2-methyl-5-oxopentanoate such as RHODISOLV® Polarclean marketed by Solvay
- propylene carbonate or their mixtures
- glycerol methyl-5- (dimethylamino) -2-methyl-5-oxopentanoate
- the solvent of step a1) may not be present.
- the solvent of step a1) must be present.
- Step a3) can be carried out at a temperature between room temperature and the boiling temperature of the solvent, preferably at room temperature.
- Step a4) may be carried out by any method well known to those skilled in the art, such as by filtration or centrifugation, in particular by centrifugation.
- Step a5) can be carried out in an oven, for example at a temperature of 40 ° C, or by air drying or lyophilization.
- An intermediate step a4) bis can be added between steps a4) and a5) which consists of washing the solid phase of the gel obtained in step a4) with the solvent of step a1).
- the compound according to the invention is therefore at least one microorganism.
- the microorganism is chosen from the group consisting of a bacterium such as Bacillus subtilis (for example accessible under the number CIP 52.62 from the Pasteur Institute), a microalga such as spirulina (for example cyanobacterium Arthrospira platensis sold under the name SPIRULINA NATURAL by the company EARTHRISE®), a fungus such as Piriformospora indica (for example accessible under the number DSM 11827 at the Max-Planck-Institut für terresthari Mikrobiologie), and their mixtures, advantageously the microorganism is in vegetative form, in encysted form or in spore form, in particular in vegetative form, more particularly it is a bacterium such as Bacillus subtilis, still more particularly in vegetative form, or a fungus such as Piriformospora indica, more particularly a bacterium such as Bacillus subtilis
- the compound according to the invention may therefore consist of a single type of microorganism such as Bacillus subtilis bacteria. It may also consist of a mixture of 2, 3 or 4 different types of microorganisms, in particular of 2 or 3 types of microorganisms. different. In an advantageous embodiment, it consists of a single type of microorganism.
- the source of silicon necessary for the synthesis of the material of formula I is advantageously chosen from the group consisting of methyltriethoxysilane, phenyltrimethoxysilane, triethoxyphenylsilane and hexadecyltrimethoxysilane, and their mixtures, more advantageously the phenyltrimethoxysilane, triethoxyphenylsilane, hexadecyltrimethoxysilane and mixtures thereof, more advantageously it is hexadecyltrimethoxysilane or a mixture of triethoxyphenylsilane and hexadecyltrimethoxysilane, in particular it is hexadecyltrimethoxysilane.
- step a) comprises the following successive steps:
- a source of magnesium advantageously magnesium nitrate hexahydrate, the microorganism, a solvent, a source silicon and in the case where x10, the aluminum source, preferably aluminum acetylacetonate;
- the method according to the invention may further comprise the following successive steps after step a3) of:
- step a5) drying of the solid phase of the gel obtained in step a4), advantageously by freeze-drying.
- the solvent of step a1) may be a polar solvent such as water, alcohol (in particular ethanol or glycerol), propylene glycol, methyl-5- (dimethylamino) -2-methyl- 5-oxopentanoate (such as RHODISOLV® Polarclean marketed by Solvay), propylene carbonate or mixtures thereof, advantageously water, alcohol (in particular ethanol or glycerol), propylene glycol, methyl-5 - (dimethylamino) -2-methyl-5-oxopentanoate (such as RHODISOLV® Polarclean marketed by Solvay) or their mixtures, more particularly water, alcohol (in particular ethanol or glycerol), methyl- 5- (dimethylamino) -2-methyl-5-oxopentanoate (such as RHODISOLV® Polarclean sold by Solvay) or mixtures thereof, more particularly water, alcohol (in particular ethanol or glycerol) or their mixtures.
- It may be a biobased and / or biodegradable solvent such as glycerol, propylene glycol, methyl-5- (dimethylamino) -2-methyl-5-oxopentanoate (such as RHODISOLV® Polarclean marketed by Solvay) propylene carbonate or mixtures thereof, in particular glycerol, propylene glycol, methyl-5- (dimethylamino) -2-methyl-5-oxopentanoate (such as RHODISOLV® Polarclean marketed by Solvay) or their mixtures, more particularly glycerol, methyl-5- (dimethylamino) -2-methyl-5 oxopentanoate (such as RHODISOLV® Polarclean marketed by Solvay) or their mixtures. It can also be a mixture of alcohol and oil.
- glycerol propylene glycol, methyl-5- (dimethylamino) -2-methyl-5-oxopentanoate (such as
- the microorganism of step a1) is in the form of a preculture of said microorganism, advantageously having a microorganism content of between 10 3 and 10 10.
- ufc / ml in particular between 10 6 and 10 9 cfu / ml, advantageously 10 8 cfu / ml.
- the method according to the invention may also comprise a preliminary step prior to step a) of preparing the microorganism preculture.
- This step can be carried out by methods that are well known to those skilled in the art. It includes in particular the seeding of the microorganism in a nutrient medium and the incubation for a period sufficient to obtain the desired microorganism concentration.
- Step a3) can be carried out at room temperature.
- Step a4) may be carried out by any method well known to those skilled in the art, such as by filtration or centrifugation, in particular by centrifugation.
- An intermediate step a4) bis can be added between steps a4) and a5) which consists of washing the solid phase of the gel obtained in step a4) with the solvent of step a1).
- step a4) ter can also be added between steps a4) or a4) bis and a5) which consists in the freezing of the solid phase of the gel obtained in step a4) or step a4) bis, if the latter is implemented.
- Step a5) can be carried out in an oven, for example at a temperature of 40 ° C, or by air drying or lyophilization, Advantageously it is carried out by lyophilization.
- the process according to the invention can be implemented in a bio-reactor.
- the present invention further relates to a compound encapsulated in an organic-inorganic hybrid material of lamellar structure type 2: 1, said material having the general formula I as described above, the encapsulated compound being selected from the group consisting of at least one active substance, at least one microorganism and mixtures thereof.
- the material, the active substance and the microorganism are as described above.
- the encapsulated compound is obtainable, in particular obtained, by the process according to the invention as described above.
- the encapsulation rate is advantageously at least 20 mg of compound / g of material, more preferably at least 30 mg of compound / g of material, more advantageously at least 40 mg of compound / g of material, in particular at least 50 mg compound / g material, more particularly at least 60 mg compound / g material, more particularly at least 65 mg compound / g material.
- the encapsulated microorganism can be revived by methods well known to those skilled in the art, such as for example by seeding on solid nutrient medium (petri dish) or liquid (bioreactor).
- petri dish solid nutrient medium
- bioreactor liquid
- the encapsulated compound can be stored between 0 and 12 months at a temperature between 4 ° C and room temperature.
- the compound When the compound is a microorganism or comprises a microorganism, it must be stored at a temperature of 4 ° C.
- the present invention furthermore relates to a composition, in particular a phytopharmaceutical composition, advantageously intended for fertilization, nutrition, growth stimulation and / or plant prophylaxis and / or the improvement of the physical, chemical and / or biological properties of the plant.
- soil or plant culture substrate comprising the compound encapsulated in a hybrid organic-inorganic material of lamellar structure type 2: 1 according to the invention.
- composition comprises any excipient suitable for administration to a plant or soil or plant culture substrate, for example by foliar application, root, field or above ground. It is in particular a phytopharmaceutically acceptable excipient.
- phytopharmaceutically acceptable which is acceptable for use on plants or soil, that is to say non-polluting for the environment and non-toxic to humans ( users).
- nutrients advantageously chosen from the group consisting of nitrogen, phosphorus, potassium, calcium, magnesium, silicon, trace elements and their mixtures, organic raw materials and / or mineral raw materials, pesticides, fungicides, herbicides, nematicides, hormones, humic substances, seaweed extracts , amino acids, plant extracts, salicylic acid and
- This composition can therefore be in the form of a fertilizer or a biostimulant.
- It can be in solid form, in particular in the form of powder, granules or microgranules, in liquid form or in gel form.
- it may for example be in solid form of the powder type, granulated, microgranulated in fertilizers or culture media for nutrition or stimulation of plants for use in full or localized.
- It can also be in the form of a liquid or gel of fertilizers or biostimulants for use in foliar or root application.
- It can also be in the form of a water-soluble fertilizer for use in fertigation field or above ground.
- It can also be in a solid or liquid form of amendment for the improvement of the physical, chemical or biological properties of the soil or the growing medium.
- It can be a phytosanitary type composition or a biocontrol composition, PNPP (natural preparations of low concern), SDN (stimulation of natural defenses), SDP (stimulation of plant defenses), in the case of plant prophylaxis .
- PNPP natural preparations of low concern
- SDN stimulation of natural defenses
- SDP stimulation of plant defenses
- compositions according to the invention can therefore be used:
- compositions may further be introduced into the water irrigation system and / or into fertilizer formulations.
- compositions to be used depends on the nature of the plant to be treated, the nature of the encapsulated compound and the intended mode of administration.
- compositions can be used in a single application or in sequential application.
- the present invention finally relates to the use of the compound according to the present invention or of the composition according to the present invention for the fertilization, the nutrition, the stimulation of the growth and / or the prophylaxis of the plants and / or the improvement of the physical properties , chemical and / or biological soil or plant growth substrate, preferably cultivated plants or agronomic interest.
- Bacillus subtilis bacterium stimulates plant growth and protects against biotic (pathogenic) and abiotic (lack of water) stresses. It makes it possible to solubilize in the water phosphate forms insoluble in the water of the phosphorus.
- the fungus Piriformospora indica improves the ability of plants to tolerate environmental stress, stimulates plant growth and promotes the absorption of nutrients. Tryptophan is a precursor to the production of auxin, a hormone that regulates root development in particular.
- the essential oil especially thyme is a stimulator of natural defenses.
- Spirulina is a producer of chemical compounds with a biological activated on plants.
- Folic acid inhibits primary root development and increased development and secondary root maturation (horizontal stretching) by redistribution of auxin (growth hormone) in primary roots.
- FIG. 1 represents the follow-up in time (in days) of the population (in cfu / ml) of Bacillus subtils CIP 52.62 encapsulated (compound according to the invention) and not encapsulated in the presence of phosphorus under the conditions of example 3 .
- FIG. 2 represents the evolution of the pH of the culture medium as a function of time (in days) in the presence of Bacillus subtilis Cl. 52.62 encapsulated (compound according to the invention) and not encapsulated and in the presence of phosphorus under the conditions of Example 3.
- FIG. 3 represents the concentration difference between the solubilized phosphorus and the phosphorus immobilized by the bacterial flora as a function of time (in days) in the presence of encapsulated Bacillus subtilis CIP 52.62 (compound according to the invention) and not encapsulated under the conditions of Example 3
- Comparative Example 1 Effect of Different Biodegradable Solvents and Ethanol on the Chemical Synthesis of Lamellar-Inorganic Oral-Inorganic Compounds
- magnesium nitrate hexahydrate MgNu 3 , 6H 2 O
- biodegradable solvent glycerol (Quaron> 99.5%) or propylene glycol (VWR)
- glycerol Quaron> 99.5%
- VWR propylene glycol
- methyl-5- (dimethylamino) -2-methyl-5-oxopentanoate RHODISOLV® Polarclean sold by Solvay
- propylene carbonate Quaron> 99.7%
- the X-ray diffractogram of the sample shows several diffraction peaks in the angular domains 2-10 ° 2 theta, 15-25 ° 2 theta, 30-40 ° 2 theta and 55-652 theta. These peaks respectively correspond to reflections on the lattice planes (001), (020; 110), (130; 220) and (060: 330), characteristic of the presence of a lamellar phase.
- the value of the do6o periodicity is 0.156 nm, a characteristic value for a phase Lamellar organic-inorganic hybrid type talc type structure of the formula Mg 3 (RSi) 40 8 (0H) 2 wherein R is phenyl.
- the periodicity of the invention is of the order of 1.32 nm.
- the amount of tryptophan in the compound was determined by UV spectrophotometry at a wavelength of 280 nm.
- the compound contains 63.4 mg of tryptophan per g of material.
- the thermogravimetric analysis carried out under air between 30 and 800 ° C at a rate of rise in temperature of 5 ° C / min shows that the most significant loss of mass (decomposition of the products) begins only from 300 ° C, which confirms that tryptophan has been encapsulated within the material (Table 2).
- the X-ray diffractogram of the sample shows several diffraction peaks in the angular domains 2-10 ° 2 theta, 15-25 ° 2 theta, 30-40 ° 2 theta and 55-652 theta. These peaks respectively correspond to reflections on the lattice planes (001), (020; 110), (130; 220) and (060: 330), characteristic of the presence of a lamellar phase.
- the value of the periodicity d 0 06 is 0.156 nm, a characteristic value for an organic-inorganic hybrid lamellar phase of talc type structure of formula Mg 3 (RSi) 408 (OH) 2 in which R represents a mixture of phenyl group and O-ethyl group.
- the periodicity is equal to 1.4 nm.
- the amount of tryptophan in the compound was determined by UV spectrophotometry at a wavelength of 280 nm, the compound comprises 68.7 mg of tryptophan per g of material.
- thermogravimetric analysis carried out under air between 30 and 800 ° C at a rate of rise in temperature of 5 ° C / min shows that the most significant loss of mass (decomposition of the products) begins only from 300 ° C, which confirms that tryptophan has been encapsulated within the material (Table 3).
- MTES compounds TRYPTO, CI 6 TMS TRYPTO, TEOS TRYPTO, 20PH-80TEOS TRYPTO, 40Ph-60TEOS TRYPTO and 60Ph-40TEOS TRYPTO
- Phenyl TRYPTO By a method identical to that used to prepare the compound 100% Phenyl TRYPTO other compounds according to the invention were prepared by replacing phenyltrimethoxysilane as a silicon source with methyltriethoxysilane (MTES) or hexadecyltrimethoxysilane (CI 6 TMS) or tetraethylsilane (TEOS). The compounds obtained were named respectively MTES TRYPTO, CI 6 TMS TRYPTO and TEOS TRYPTO.
- MTES methyltriethoxysilane
- CI 6 TMS hexadecyltrimethoxysilane
- TEOS tetraethylsilane
- the X-ray diffractogram of the samples of each of the compounds exhibited several diffraction peaks in the angular domains 2-10 ° 2 theta, 15-25 ° 2 theta, 30-40 ° 2 theta and 55-652 theta. These peaks respectively correspond to reflections on the lattice planes (001), (020; 110), (130; 220) and (060: 330), characteristic of the presence of a lamellar phase.
- the value of the periodicity d 0 06 is 0.156 nm, a characteristic value for an organic-inorganic hybrid lamellar phase of talc type structure of formula Mg 3 (RSi) 4 0 8 (OH) 2 .
- the periodicity is equal to 1.4 nm.
- tryptophan encapsulated in an organic-inorganic hybrid material of lamellar structure of type 2: 1 having the formula Mg 3 (RSi) 4 O 8 (OH) 2 is obtained.
- the silicon source is a mixture between TEOS and PhenylTMS
- the amount of encapsulated tryptophan is 0. % (100% Phenyl TRYPTO compound).
- the value of the periodicity d 06 o is 0.156 nm, a characteristic value for a lamellar phase of organic-inorganic hybrid type of talc type structure.
- the periodicities dooi are of the order of 1.4 nm. It should be noted that the intensity of the diffraction peaks decreases with the oil content in the mixture.
- the thermogravimetric analysis carried out under air between 30 and 800 ° C at a rate of rise in temperature of 5 ° C / min shows that the most significant loss of mass (decomposition of the products) begins only from 300 ° C, which confirms that the oil has been encapsulated within the material (Table 5).
- the solid After 24h stirring at room temperature, the solid is separated from the solution by centrifugation (speed of 10,000 rpm for 10 min). The solid is dried in an oven at 60 ° C for 24 hours. The compound obtained (2.1 g) is then milled in an agate mortar before being characterized and is noted Eth-Ph 200AF in situ.
- the X-ray diffractogram of the sample shows several diffraction peaks in the angular domains 2-10 ° 2 theta, 15-25 ° 2 theta, 30-40 ° 2 theta and 55-65 ° 2 theta. These peaks respectively correspond to reflections on the lattice planes (001), (020; 110), (130; 220) and (060; 330), characteristic of the presence of a lamellar phase.
- the value of the periodicity d 0 6o is 0.156 nm, a characteristic value for a lamellar phase of the organic-inorganic hybrid type of talc-type structure of formula Mg 3 (RSi) 40 8 (OH) 2 in which R represents a phenyl group .
- the periodicity d 0 oi is of the order of 1.14 nm.
- the amount of folic acid in the compound was determined by UV spectrophotometry at a wavelength of 280 nm, the compound comprises 108.3 mg of folic acid per g of material.
- the thermogravimetric analysis carried out under air between 30 and 800 ° C at a rate of rise in temperature of 5 ° C / min shows that the most significant loss of mass (decomposition of the products) begins only from 300 ° C, which confirms that the folic acid has been encapsulated within the material (Table 6).
- the solid After 24h stirring at room temperature, the solid is separated from the solution by centrifugation (speed of 10,000 rpm for 10 min). The solid is washed four times with deionized water before being dried in an oven at 60 ° C for 24 hours. The compound obtained (2.2 g) is then milled in an agate mortar before being characterized and is noted Gly-Ph 200AF in situ.
- the X-ray diffractogram of the sample shows several diffraction peaks in the angular domains 2-10 ° 2 theta, 15-25 ° 2 theta, 30-40 ° 2 theta and 55-65 ° 2 theta. These peaks respectively correspond to reflections on the lattice planes (001), (020; 110), (130; 220) and (060; 330), characteristic of the presence of a lamellar phase.
- the value of the periodicity do6o is 0.155 nm, a characteristic value for a lamellar phase organic-inorganic hybrid type talc type structure of the formula Mg 3 (RSi) 40 8 (0H) 2 wherein R is phenyl.
- the periodicity d 0 oi is of the order of 1.24 nm.
- the amount of folic acid in the compound was determined by UV spectrophotometry at a wavelength of 280 nm, the compound comprises 56.66 mg of folic acid per g of material.
- the thermogravimetric analysis carried out under air between 30 and 800 ° C at a rate of rise in temperature of 5 ° C / min shows that the most significant loss of mass (decomposition of the products) begins only from 300 ° C, which confirms that the folic acid has been encapsulated within the material (Table 7).
- Table 7 Result of thermogravimetric analyzes carried out under air
- a preculture of Bacillus subtilis (accessible under the number CIP 52.62 of the Pasteur Institute) is prepared from cryotubes containing 400 ⁇ l of a suspension of Bacillus subtilis maintained at -20 ° C. in 1.6 ml of glycerol.
- the nutrient medium in which the contents of the cryotube are incorporated is an LB broth (lysogeny broth). It is composed of 10 g of tryptone (pancreatic hydrolyzate casein type peptone), 5 g of yeast extract and 10 g of NaCl for 1 liter of demineralized water.
- the yeast extract is obtained from yeast autolysates. This is suspended yeast biomass driven to autolysis by passage at 50 ° C for several hours, the liquid phase of which is recovered.
- This medium is prepared directly in the Erlenmeyer flasks and then autoclaved for 20 minutes at 121 ° C. The seeding is then carried out with the flame to avoid any contamination. An enumeration in the middle solid on petri dish (90 mm diameter) is performed after 18 hours of incubation at 37 ° C to determine the initial concentration of bacteria that is added during the synthesis.
- the synthesis is carried out in a bioreactor.
- the first step is to clean the bioreactor with absolute ethanol.
- the preculture is introduced into the bioreactor (at 10% of the final volume, ie 200 ml of LB medium containing the bacteria at a level of 10 3 cfu / ml).
- 97g of magnesium nitrate (99%, Sigma Aldrich) are dissolved in one liter of absolute ethanol (99.9%, Carlo Erba).
- 100 g of phenyltrimethoxysilane (PhenylTMS) (98%, ABCR) are then added to this solution and the whole is poured into the bioreactor.
- Characterization of the sample by X-ray diffraction indicates the formation of an organic-inorganic type lamellar phase of talc type structure of formula Mg 3 (RSi) 4 0 8 (OH) 2 in which R represents a phenyl group (presence of the characteristic reflections of the lattice planes (001), (020, 110), (130.220) and (060)) with a periodicity d 001 equal to 1.3 nm.
- CieTMS BS compound A preculture of Bacillus subtilis (accessible under the number CIP 52.62 of the Pasteur Institute) is prepared from cryotubes containing 400 ⁇ l of a suspension of Bacillus subtilis maintained at -20 ° C. in 1.6 ml of glycerol.
- the nutrient medium in which the contents of the cryotube are incorporated is an LB broth (lysogeny broth) as described above. This medium is prepared directly in the Erlenmeyer flasks and then autoclaved for 20 minutes at 121 ° C. The seeding is then carried out with the flame to avoid any contamination.
- the synthesis is carried out in a bioreactor.
- the first step is to clean the bioreactor with absolute ethanol.
- the preculture is introduced into the bioreactor (at 10% of the final volume, ie 200 ml of LB medium containing the bacteria).
- 55.65 g of magnesium nitrate hexahydrate (99%, Sigma Aldrich) are dissolved in one liter of absolute ethanol (99.9%, Carlo Erba).
- 100 g of hexadecyltrimethoxysilane ( C16 TMS) (> 85%, Sigma) are then added to this solution and the whole is poured into the bioreactor.
- Characterization of the sample by X-ray diffraction indicates the formation of a lamellar phase of organic-inorganic type of talc type structure of formula Mg 3 (RSi) 4 0 8 (OH) 2 in which R represents a CH 3 (CH 2) 4 CH 2 ((presence of characteristic reflections of the lattice planes (001), (020, 110), (130.220 ) and (060) with a periodicity d 00i equal to 1.5 nm.
- a petri dish (90 mm diameter) is made at 37 ° C in the dark with 60% relative humidity to determine the concentration of microorganisms at To (No), To + 24h (N 24h ) and To + 14 days (N i4j ) after synthesis.
- the results are shown in Table 8 below.
- Table 8 concentration of microorganisms at To (No), To + 24h (N 24h ) and To + 14 days (NMJ) after synthesis according to the solvent used for the synthesis
- the viability of the microorganisms is maintained at least 14 days after synthesis with glycerol, propylene glycol or Polarclean as solvent. This result confirms that biodegradable solvents can be used for the encapsulation of Bacillus subtilis.
- BaciHus subtilis culture medium (accessible under the CIP 52.62 number from the Pasteur Institute) at 6.50 ⁇ 10 7 cfu / ml (the culture medium was prepared in a 3L bioreactor by seeding BaciHus subtilized in 20 mL of BHI medium (OXOID) and incubated 18-24 h at 30 ° C, 200 rpm).
- Table 9 concentration of microorganisms at To (N 0 ), To + 24h (N 24h ) and To + 15 days (Nisj) after synthesis according to the solvent used for the synthesis and the storage temperature.
- Example 2.1c2 The synthesis is identical to that of Example 2.1c2 with glycerol (Quaron> 99.5%) or methyl-5- (dimethylamino) -2-methyl-5-oxopentanoate (RHODISOLV® Polarclean) as solvent.
- 2 samples of 500mL of the mixture are made. In the dark, 45 samples of 9mL are taken.
- 3 batches of 15 samples are made and respectively placed in an oven (30% relative humidity) at + 40 ° C, + 60 ° C and + 80 ° C ⁇ 2 ° C.
- 3 batches of 15 samples of non-encapsulated microorganisms are also constituted and respectively placed in an oven (20% relative humidity) at + 60 ° C. and + 80 ° C.
- Table 10 concentration of microorganisms to To (Name / nX To + 2min (N 2min) / To + 5min (Nsmin) and To + 10 min (N 10mi n) after heat treatment depending on the solvent used for your synthesis and ia temperature of the heat treatment.
- the fungus Piriformospora indica (P. indica) (accessible under the number DSM 11827 from Max-Planck-Institut für Terresthari Mikrobiologie) is initially placed in an incubator (box 140 mm in diameter) for 72 hours at 28 ⁇ 1 ° C, with YCG agar to obtain a fresh culture.
- the mycelium is collected using a sterile spatula and introduced into an Erlenmeyer flask containing 0.5% tween 80 solution and beads. After stirring for 2 minutes, an enumeration in a solid medium is carried out in order to determine the starting concentration (N0, in cfu / ml).
- sample of reference CI 6 TMS PI For comparison, a sample is prepared under the same conditions in the absence of P. Indica.
- X-ray diffraction analysis indicates that in both cases a lamellar phase is obtained with a periodicity of 1.53 nm for the sample CI 6 TMS PI and at 1.60 nm for the compound without P. Indica. .
- the SEM images of the CI 6 TMS PI sample show the presence of shapes very similar to the hyphae observed with the only Hyphes mushroom (about 2 ⁇ m wide) covered with particles of material. The fungus is thus encapsulated in its vegetative form (hyphae + conidiophores) in the material of formula I according to the invention,
- magnesium nitrate hexahydrate (MgNC, 6H 2 O) (99%, Sigma Aldrich) and 100 ml of biodegradable solvent (Glycerol (Quaron> 99.5%)) were added with stirring. at 55 ° C at 220 rpm for 15 minutes. Add with stirring for 15 minutes of 7.71 g of triethoxyphenylsilane (97%, Sigma Aldrich) and 2.29 g of hexadecyltrimethoxysilane (> 85%, Sigma).
- Table 11 concentration of microorganisms at To (N 0 ), To + 24h (N 2 4h) and To + 14 days (Ni) after synthesis
- a solid medium count on petri dish (90 mm in diameter) is carried out at 37 ° C to determine the concentration of mushrooms at To (N 0 ), To + 24h (N24 h ), To + 15j (Ni3 ⁇ 4) and To + 30j (N 30j ). The results are shown in Table 12 below.
- Table 12 concentration of microorganisms at To (No), To + 24h (N 2 4h), To + 15 days (N 15 J) and To + 30j (N30j) after synthesis as a function of the storage temperature.
- Example 2.2b2 The synthesis is identical to that of Example 2.2b2. 2 samples of 500mL of the mixture are made. In the dark, 45 samples of 9mL are taken. 3 batches of 15 samples are made and respectively placed in an oven (30% relative humidity) at + 40 ° C, + 60 ° C and + 80 ° C ⁇ 2 ° C. In addition to darkness, 3 batches of 15 samples of non-encapsulated microorganisms are also constituted and respectively placed in an oven (20% relative humidity) at + 40 ° C, + 60 ° C and + 80 ° C ⁇ 2 ° C . The setpoint temperature increases are calibrated over a period of 30 minutes whereby the tubes are held for 2min, 5min and 10 minutes at the core setpoint before removal of the count tubes.
- Table 13 microorganism concentration at To (Nomin), To + 2 min (N 2 min) To + 5 min (N 5 mm) and To-h 10 min (N 10 min) after heat treatment as a function of the temperature of the heat treatment.
- the treatments reveal the lower thermal sensitivity of piriformospora indica encapsulated compared to non-encapsulated Piriformospora indica (at 60 ° C./2 min, 4.40 ⁇ 10 4 cfu / ml against 7.10 ⁇ 10 3 cfu / ml; C / 5min 4.55xl0 4 cfu / ml against 9.06xl0 3 cfu / ml, at 60 ° C / 10min l, 95xl0 4 cfu / ml against 1.31xl0 2 cfu / ml, at 80 ° C / 2min, 1, 50x1o 1 cfu / ml against 0.00x100 cfu / ml).
- the thermal protection provided by the encapsulation is confirmed.
- X-ray diffraction analysis indicates that in both cases a lamellar phase of talc type structure is obtained with a periodicity of 1.6 nm in both cases (presence of diffraction peaks in the angular domains 2-10). 2 theta, 15-25 ° 2 theta, 30-40 ° 2 theta and 55-65 ° 2 theta corresponding respectively to reflections on the (001), (020; 110), (130; 220) and ( 060: 330)).
- the presence of spirulina does not inhibit the formation of the material.
- the presence of Spirulina does not induce increase of the periodicity of 0 oi ⁇ Spirulina is therefore encapsulated in its vegetative form (twisted structure) in the material according to the invention.
- a liquid culture medium (glucose, 10g / L, MgCl 2 .6H 2 O, 5g / L, MgSO 4 .7H 2 O, 0.25g / L, KCl, 0.2g / L; (NH 4 ) 2 S0 4.0 ( g / L) pH 7.0, supplemented with an insoluble phosphorus source in an aqueous medium (NH 4 MgPO 4 • 6H 2 O 8.9g / Erlenmeyer) is prepared.
- Each Erlenmeyer flask is then inoculated with 1 ml of a preculture of Bacillus subtHis CIP 52.62 (Institut Pasteur) at a concentration of 6.5 ⁇ 10 4 cfu / ml (free) or 382.3 ml of a preculture of Bacillus subtilis CIP. 52.62 at the concentration of 1.7 ⁇ 10 5 cfu / ml (compound according to the invention 100% Phenyl BS: encapsulated bacterium prepared according to Example 3a).
- the Erlenmeyer flasks are kept in an oven with stirring.
- a colony count is made every 2 days as well as a measurement of the pH and concentration of solubilized phosphorus and phosphorus immobilized by the bacterial flora (measurement of total phosphorus by ICP and measurement of inorganic phosphate in solution by HPIC).
- the results are shown in FIGS. 1 to 3.
- the developmental comparison of Bacillus subtilis indicates a better solubilization capacity of the water insoluble phosphorus (FIG. 1).
- the comparison of development of Bacillus subtilis indicates a drop in the pH of the solution to be correlated with solubilization of bacterial origin of phosphorus (FIG. 2).
- the comparison of the phosphorus concentration indicates a greater bacterial solubilization than its immobilization by the bacterial flora (FIG. 3).
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FR1850504A FR3077067B1 (fr) | 2018-01-23 | 2018-01-23 | Encapsulation de substances actives et/ou de microorganismes dans un materiau lamellaire |
PCT/FR2019/050140 WO2019145636A1 (fr) | 2018-01-23 | 2019-01-22 | Encapsulation de substances actives et/ou de microorganismes dans un materiau lamellaire |
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EP (1) | EP3743377A1 (fr) |
BR (1) | BR112020014279A2 (fr) |
CA (1) | CA3088222A1 (fr) |
FR (1) | FR3077067B1 (fr) |
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US11649196B2 (en) | 2023-05-16 |
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ZA202004541B (en) | 2022-10-26 |
CA3088222A1 (fr) | 2019-08-01 |
FR3077067A1 (fr) | 2019-07-26 |
US20210032178A1 (en) | 2021-02-04 |
WO2019145636A1 (fr) | 2019-08-01 |
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