US20220202713A1 - Curcumin Solubilisate - Google Patents

Curcumin Solubilisate Download PDF

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US20220202713A1
US20220202713A1 US17/698,389 US202217698389A US2022202713A1 US 20220202713 A1 US20220202713 A1 US 20220202713A1 US 202217698389 A US202217698389 A US 202217698389A US 2022202713 A1 US2022202713 A1 US 2022202713A1
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solubilisate
curcumin
fnu
polysorbate
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Dariush Behnam
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Aquanova AG
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00Medicinal preparations characterised by special physical form
    • A61K9/10Dispersions; Emulsions
    • A61K9/107Emulsions ; Emulsion preconcentrates; Micelles
    • A61K9/1075Microemulsions or submicron emulsions; Preconcentrates or solids thereof; Micelles, e.g. made of phospholipids or block copolymers
    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23DEDIBLE OILS OR FATS, e.g. MARGARINES, SHORTENINGS, COOKING OILS
    • A23D7/00Edible oil or fat compositions containing an aqueous phase, e.g. margarines
    • A23D7/005Edible oil or fat compositions containing an aqueous phase, e.g. margarines characterised by ingredients other than fatty acid triglycerides
    • A23D7/0053Compositions other than spreads
    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23LFOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L2/00Non-alcoholic beverages; Dry compositions or concentrates therefor; Their preparation
    • A23L2/385Concentrates of non-alcoholic beverages
    • A23L2/39Dry compositions
    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23LFOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L2/00Non-alcoholic beverages; Dry compositions or concentrates therefor; Their preparation
    • A23L2/52Adding ingredients
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    • A23LFOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L2/00Non-alcoholic beverages; Dry compositions or concentrates therefor; Their preparation
    • A23L2/52Adding ingredients
    • A23L2/56Flavouring or bittering agents
    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23LFOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L27/00Spices; Flavouring agents or condiments; Artificial sweetening agents; Table salts; Dietetic salt substitutes; Preparation or treatment thereof
    • A23L27/10Natural spices, flavouring agents or condiments; Extracts thereof
    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23LFOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L33/00Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof
    • A23L33/10Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof using additives
    • A23L33/105Plant extracts, their artificial duplicates or their derivatives
    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23PSHAPING OR WORKING OF FOODSTUFFS, NOT FULLY COVERED BY A SINGLE OTHER SUBCLASS
    • A23P10/00Shaping or working of foodstuffs characterised by the products
    • A23P10/30Encapsulation of particles, e.g. foodstuff additives
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
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    • A61K31/12Ketones
    • AHUMAN NECESSITIES
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    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00Medicinal preparations containing organic active ingredients
    • A61K31/12Ketones
    • A61K31/121Ketones acyclic
    • AHUMAN NECESSITIES
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    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K36/00Medicinal preparations of undetermined constitution containing material from algae, lichens, fungi or plants, or derivatives thereof, e.g. traditional herbal medicines
    • A61K36/18Magnoliophyta (angiosperms)
    • A61K36/88Liliopsida (monocotyledons)
    • A61K36/906Zingiberaceae (Ginger family)
    • A61K36/9066Curcuma, e.g. common turmeric, East Indian arrowroot or mango ginger
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K47/00Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
    • A61K47/06Organic compounds, e.g. natural or synthetic hydrocarbons, polyolefins, mineral oil, petrolatum or ozokerite
    • A61K47/26Carbohydrates, e.g. sugar alcohols, amino sugars, nucleic acids, mono-, di- or oligo-saccharides; Derivatives thereof, e.g. polysorbates, sorbitan fatty acid esters or glycyrrhizin
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00Cosmetics or similar toiletry preparations
    • A61K8/18Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/30Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
    • A61K8/33Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing oxygen
    • A61K8/35Ketones, e.g. benzophenone
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00Medicinal preparations characterised by special physical form
    • A61K9/48Preparations in capsules, e.g. of gelatin, of chocolate
    • A61K9/4808Preparations in capsules, e.g. of gelatin, of chocolate characterised by the form of the capsule or the structure of the filling; Capsules containing small tablets; Capsules with outer layer for immediate drug release
    • AHUMAN NECESSITIES
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    • AHUMAN NECESSITIES
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    • A61P25/00Drugs for disorders of the nervous system
    • A61P25/28Drugs for disorders of the nervous system for treating neurodegenerative disorders of the central nervous system, e.g. nootropic agents, cognition enhancers, drugs for treating Alzheimer's disease or other forms of dementia
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • A61P35/00Antineoplastic agents
    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23LFOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L33/00Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof
    • A23L33/10Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof using additives
    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23LFOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L5/00Preparation or treatment of foods or foodstuffs, in general; Food or foodstuffs obtained thereby; Materials therefor
    • A23L5/40Colouring or decolouring of foods
    • A23L5/42Addition of dyes or pigments, e.g. in combination with optical brighteners
    • A23L5/43Addition of dyes or pigments, e.g. in combination with optical brighteners using naturally occurring organic dyes or pigments, their artificial duplicates or their derivatives
    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23VINDEXING SCHEME RELATING TO FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES AND LACTIC OR PROPIONIC ACID BACTERIA USED IN FOODSTUFFS OR FOOD PREPARATION
    • A23V2002/00Food compositions, function of food ingredients or processes for food or foodstuffs
    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23VINDEXING SCHEME RELATING TO FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES AND LACTIC OR PROPIONIC ACID BACTERIA USED IN FOODSTUFFS OR FOOD PREPARATION
    • A23V2250/00Food ingredients
    • A23V2250/20Natural extracts
    • A23V2250/21Plant extracts
    • A23V2250/2112Curcumin, turmeric
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00Medicinal preparations characterised by special physical form
    • A61K9/48Preparations in capsules, e.g. of gelatin, of chocolate
    • A61K9/4841Filling excipients; Inactive ingredients
    • A61K9/4858Organic compounds

Definitions

  • Curcumin is a turmeric extract that has been well known around the world for 5 decades, through the publication of numerous study results, as a spice, a food coloring (E100), as well as a medicament in traditional medicine, and in recent decades in mainstream medicine, as an effective active substance in immunology, osteogenesis, angiogenesis, neurogenesis, and carcinogenesis.
  • Curcumin is offered in numerous end products (nutritional supplements), such as in capsules or in liquid cloudy beverages, in its native form (powder), or combined with auxiliary substances such as oil, glycerin, ethanol, phospholipids or lecithin, cyclodextrin, gum arabic, gelatins, pectins, sugar esters of fatty acids, or saponins.
  • auxiliary substances such as oil, glycerin, ethanol, phospholipids or lecithin, cyclodextrin, gum arabic, gelatins, pectins, sugar esters of fatty acids, or saponins.
  • these formulations are not transparent, do not result in an aqueous clear solution, and have extremely low absorption, i.e., bioavailability.
  • curcumin for producing carrier systems, for example emulsions or liposomes
  • curcumin is dissolved in a lipophilic phase and stabilized in droplet form in an aqueous environment
  • liposomes the curcumin may be held in a phospholipid layer.
  • bioavailability may be increased by up to 50%, these types of formulations such as liposomes are extremely unstable mechanically, and also are not resistant to the environment in the stomach.
  • Curcumin has attracted special attention in mainstream medicine, in particular in conjunction with neurogenesis (Alzheimer's disease, among others) and carcinogenesis (cancer). To allow preventative action to be taken against these primarily age-related common ailments, which are beginning to have alarming economic impacts, it is an object of the invention to optimize the absorption, i.e., bioavailability, of curcumin by means of an appropriate, suitable formulation. It is a further object of the invention to achieve a stable, homogeneous fine distribution of curcumin in the corresponding end products, such as dietary and nutritional supplements.
  • the invention provides a micellar curcumin formulation, on the basis of which bioavailability that is at least 230 times higher in comparison to native curcumin has been established in a human study.
  • the invention provides a solubilisate consisting of curcumin in a quantity of less than or equal to 10% by weight, preferably less than or equal to 7.5% by weight, particularly preferably 6% by weight, and at least one emulsifier having an HLB value in the range between 13 and 18, in particular polysorbate 80 or polysorbate 20 or a mixture of polysorbate 20 and polysorbate 80, wherein the average diameter of the micelles loaded with curcumin is between 5 nm and 40 nm, preferably between 6 nm and 20 nm, particularly preferably between 7 nm and 10 nm.
  • FIG. 1 shows photographs of curcumin formulation samples.
  • High loading of the micelles with curcumin may thus be advantageously achieved without the micelles bursting and the curcumin being released as sediment upon dilution with water.
  • the transparent, completely stable water-soluble curcumin formulation according to the invention without the above-mentioned auxiliary substances such as in soft and hard gelatin capsules, has stable transparency and also greatly improved bioavailability, independently of pH, in gelatin-free capsules (hard and/or soft) and in beverages or liquid, water-based end products.
  • Products having such transparency and water solubility, but also in particular such a high bioavailability of the curcumin formulation are in urgent demand by the relevant industry for innovative products as a capsule filling and as transparent curcumin beverages.
  • a curcumin formulation which meets these requirements has not existed heretofore.
  • the particularly small size of the micelles in the solubilisate according to the invention results in a clear, permanently transparent product.
  • the narrow particle size distribution also contributes to this end, since the diameter distribution of the micelles ranges only from approximately 4 nm to approximately 30 nm.
  • the particle size distribution of the micelles was measured according to the principle of dynamic light scattering in a 180° backscattering system, using laser light having a wavelength of 780 nm. Due to the small particle sizes, the formation of a liquid which is clear, in particular for perception by the human eye, is advantageously achieved. The clarity of the solubilisate may also be represented by its low turbidity.
  • the solubilisate according to the invention is further characterized in that the total curcuminoid concentration in human blood plasma, measured one hour after oral administration of 500 mg curcumin in the form of the solubilisate, is approximately
  • the human study on which these values are based was conducted on 24 healthy persons between 19 and 29 years of age, who received a single oral dose of 500 mg native curcumin or curcumin in the form of the solubilisate according to the invention. Blood samples were withdrawn at various times over a period of 24 hours after the curcumin was taken. To minimize the possible concurrent influence of digested food, the test subjects were served standardized meals. One hour after taking the curcumin in native form, less than 1 nmol/l plasma was measured; 8 hours after administration, 2.4 nmol/l was measured; and 24 hours after administration, 2.4 nmol/l was measured.
  • curcumin from the solubilisate according to the invention one hour after administration, 1,964 nmol/l was measured in the blood plasma; 8 hours after administration, 307.1 nmol/l was measured; and 24 hours after administration, 67.7 nmol/l was measured.
  • a solubilisate containing 66.5% by weight curcumin was used (the commercial product “6% NovaSOL Curcumin” of the applicant).
  • the curcumin concentration in the blood plasma showed increases by a factor between 36 and 2800 as a result of the formulation as solubilisate according to the invention, compared to native curcumin.
  • the area under the curve of the total curcumin concentration in the blood plasma (area under the total curcumin plasma concentration-time curve (AUC)), measured over a period of 24 hours, was 42.6 nmol h/L for administration of native curcumin, and 9,821.4 nmol h/L for administration of the solubilisate according to the invention.
  • AUC total curcumin plasma concentration-time curve
  • the bioavailability of the 66.5% curcumin solubilisate is much better than that of the native form. Viewed as the plasma AUC over 24 hours, the bioavailability as a result of the formulation according to the invention of the solubilisate is approximately 230 times higher.
  • the turbidity of the solubilisate according to the invention is less than 30 FNU, preferably less than 20 FNU, and particularly preferably is in the range between 0.5 FNU and 2 FNU, determined by scattered light measurement with infrared light according to the requirements of the ISO 7027 standard at a dilution of the solubilisate in water in a ratio of 1:1000.
  • the solubilisate according to the invention maintains this low turbidity after 24 hours storage at 21° C. and pH 7, as well as after 1 hour storage at 37° C. and pH 1.1, i.e., under storage conditions on the one hand at room temperature in aqueous dilution, and on the other hand, during passage through the stomach. Therefore, according to the present knowledge of the inventor, the curcumin in the solubilisate according to the invention is still present in the form of the stable, very small micelles even after passage through the stomach, and may therefore by absorbed particularly well in the further digestive tract.
  • the turbidity measuring devices are calibrated with a standard suspension.
  • the indication is provided not in the form of the measured light intensity, but, rather, as the concentration of the calibration suspension.
  • the indication thus signifies that the liquid in question has caused the same light scattering as the standard suspension of the indicated concentration.
  • the internationally established turbidity standard is formazin.
  • the most commonly used units are “FNU” (formazin nephelometric units). This is the unit that is used, for example, in water treatment for the measurement at 90° according to the requirements of the ISO 7072 standard.
  • the turbidity of the solubilisate according to the invention is less than 30 FNU, preferably less than 20 FNU, and is particularly preferably in the range between 0.5 FNU and 2 FNU, determined by scattered light measurement with infrared light according to the requirements of the ISO 7027 standard at a dilution of the solubilisate in water in a ratio of 1:1000.
  • the solubilisate according to the invention may contain up to 5% by weight water and/or between 12% by weight and 20% by weight glycerin.
  • the solubilisate according to the invention may be easily provided in capsules for oral administration, since it does not attack the capsules.
  • the invention thus also provides a capsule filled with the solubilisate, wherein the capsule may be formed as a soft gelatin capsule or hard gelatin capsule, or as a soft gelatin-free capsule or as a hard gelatin-free capsule.
  • An additional administration form is a fluid containing the solubilisate according to the invention, wherein the fluid may be a food, a beverage, a cosmetic product such as a cream, lotion, or salve in particular, or a pharmaceutical product.
  • the fluid may comprise an aqueous dilution of the solubilisate.
  • the usability of the according to the invention in a fluid is not bound to its viscosity; the solubilisate may likewise be incorporated into hydrophilic as well as lipophilic media.
  • the particle size measurements were carried out using a ParticleMetrix NANOTRAC backscattering particle analyzer.
  • the measuring principle is based on dynamic light scattering (DLS) in a 180° heterodyne backscattering system. In this geometry, a portion of the laser beam is mixed with the scattered light. This has the same positive effect with regard to the signal/noise ratio as the superimposition of all light wavelengths in a Fourier spectrometer. The color of the sample has no influence on the quality of the measurement.
  • the measurements were carried out in a 1:1000 aqueous dilution. To this end, the solubilisate was dissolved in water with stirring. The solubilisate is soluble in water, in which it is completely clear. This solution is stable and transparent.
  • the 70 g contains 95% curcumin, i.e., 66.5 g of curcumin.
  • curcumin powder for example Oleoresin Turmeric 95% (curcumin powder), Jupiter Leys, or Curcumin BCM-95-SG, Eurochem, or Curcumin BCM-95-CG, Eurochem, or Curcuma Oleoresin 95%, Henry Lamotte.
  • the polysorbate 80 is heated to approximately 48° C. to approximately 52° C.
  • the curcumin powder is slowly added to the polysorbate 80, with stirring. During the addition of the curcumin powder, further heating to approximately 87° C. to approximately 91° C. is carried out.
  • the resulting solubilisate is cooled to below approximately 60° C., and is then ready for filling.
  • the solubilisate is yellow-orange to reddish, very dark, intensely colored, and transparent.
  • the curcumin portion may be increased to approximately 10% by weight at the expense of the polysorbate 80 portion.
  • the solubilisate Only 894 g polysorbate 20 and 106 g 95% curcumin powder are used for producing the solubilisate.
  • the 106 g contains 95% curcumin, i.e., 100.7 g of curcumin.
  • curcumin powder for example Oleoresin Turmeric 95% (curcumin powder), Jupiter Leys, or Curcumin BCM-95-SG, Eurochem, or Curcumin BCM-95-CG, Eurochem, or Curcuma Oleoresin 95%, Henry Lamotte.
  • Oleoresin Turmeric 95% curcumin powder
  • Jupiter Leys or Curcumin BCM-95-SG, Eurochem
  • Curcumin BCM-95-CG Eurochem
  • Curcuma Oleoresin 95% Henry Lamotte.
  • the polysorbate 20 is heated to approximately 63° C. to approximately 67° C.
  • the curcumin powder is slowly added to the polysorbate 20, with stirring. During the addition of the curcumin powder, further heating to approximately 83° C. to approximately 87° C. is carried out. The resulting solubilisate is slowly cooled to below approximately 45° C., and is then ready for filling.
  • the solubilisate is yellow-orange to reddish, very dark, intensely colored, and transparent.
  • the curcumin portion may be varied at the expense of the polysorbate 80 portion.
  • FIG. 1 Photographs of samples of various curcumin formulations are shown in appended FIG. 1 .
  • the left side of the illustration shows the samples 24 hours after addition to water at a temperature of 21° C., under neutral conditions (pH 7).
  • the right side of the illustration shows the samples under physiological conditions 1 hour after addition to water at a temperature of 37° C., under conditions as in the stomach (pH 1.1). In each case, enough water was added to the starting preparations to give a curcumin concentration of 11.4 g/L in the illustrated sample.
  • Curcumin extract native form, powder, 95% curcumin (BCM 95). 12 g of the powder was introduced into 1 liter of water.

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Abstract

A solubilize composed of curcumin in a quantity of less than or equal to 10% by weight, preferable less than or equal to 7.5% by weight, particularly preferable 6% by weight, and at least one emulsifier having an HLB value in the range between 13 and 18, in particular polysorbate 80 or polysorbate 20 or a mixture of polysorbate 20 and polysorbate 80, wherein the average diameter of the micelles loaded with curcumin in between 5 nm and 40 nm, preferable between 6 nm and 20 nm, particularly preferable between 7 nm and 10 nm.

Description

    CROSS-REFERENCE TO RELATED APPLICATIONS
  • This application is a continuation of U.S. application Ser. No. 14/653,560, filed on Jun. 18, 2015, which is a National Stage application under 35 U.S.C. § 371 of International Application No. PCT/EP2013/001427, filed on May 15, 2013, which claims benefit of German Application No. 20 2012 012 130.8, filed on Dec. 19, 2012, the contents of which are hereby incorporated by reference in their entirety.
  • BACKGROUND
  • Curcumin is a turmeric extract that has been well known around the world for 5 decades, through the publication of numerous study results, as a spice, a food coloring (E100), as well as a medicament in traditional medicine, and in recent decades in mainstream medicine, as an effective active substance in immunology, osteogenesis, angiogenesis, neurogenesis, and carcinogenesis.
  • Curcumin is offered in numerous end products (nutritional supplements), such as in capsules or in liquid cloudy beverages, in its native form (powder), or combined with auxiliary substances such as oil, glycerin, ethanol, phospholipids or lecithin, cyclodextrin, gum arabic, gelatins, pectins, sugar esters of fatty acids, or saponins. However, it is problematic that these formulations are not transparent, do not result in an aqueous clear solution, and have extremely low absorption, i.e., bioavailability.
  • The use of further components in addition to curcumin for producing carrier systems, for example emulsions or liposomes, is known for increasing the bioavailability. Whereas in emulsions the curcumin is dissolved in a lipophilic phase and stabilized in droplet form in an aqueous environment, in liposomes the curcumin may be held in a phospholipid layer. Although the bioavailability may be increased by up to 50%, these types of formulations such as liposomes are extremely unstable mechanically, and also are not resistant to the environment in the stomach.
  • Curcumin has attracted special attention in mainstream medicine, in particular in conjunction with neurogenesis (Alzheimer's disease, among others) and carcinogenesis (cancer). To allow preventative action to be taken against these primarily age-related common ailments, which are beginning to have alarming economic impacts, it is an object of the invention to optimize the absorption, i.e., bioavailability, of curcumin by means of an appropriate, suitable formulation. It is a further object of the invention to achieve a stable, homogeneous fine distribution of curcumin in the corresponding end products, such as dietary and nutritional supplements.
  • SUMMARY
  • The invention provides a micellar curcumin formulation, on the basis of which bioavailability that is at least 230 times higher in comparison to native curcumin has been established in a human study. The invention provides a solubilisate consisting of curcumin in a quantity of less than or equal to 10% by weight, preferably less than or equal to 7.5% by weight, particularly preferably 6% by weight, and at least one emulsifier having an HLB value in the range between 13 and 18, in particular polysorbate 80 or polysorbate 20 or a mixture of polysorbate 20 and polysorbate 80, wherein the average diameter of the micelles loaded with curcumin is between 5 nm and 40 nm, preferably between 6 nm and 20 nm, particularly preferably between 7 nm and 10 nm.
  • BRIEF DESCRIPTION OF DRAWINGS
  • FIG. 1 shows photographs of curcumin formulation samples.
  • DETAILED DESCRIPTION
  • High loading of the micelles with curcumin may thus be advantageously achieved without the micelles bursting and the curcumin being released as sediment upon dilution with water.
  • The transparent, completely stable water-soluble curcumin formulation according to the invention, without the above-mentioned auxiliary substances such as in soft and hard gelatin capsules, has stable transparency and also greatly improved bioavailability, independently of pH, in gelatin-free capsules (hard and/or soft) and in beverages or liquid, water-based end products. Products having such transparency and water solubility, but also in particular such a high bioavailability of the curcumin formulation, are in urgent demand by the relevant industry for innovative products as a capsule filling and as transparent curcumin beverages. To the knowledge of the inventor, a curcumin formulation which meets these requirements has not existed heretofore.
  • The particularly small size of the micelles in the solubilisate according to the invention results in a clear, permanently transparent product. The narrow particle size distribution also contributes to this end, since the diameter distribution of the micelles ranges only from approximately 4 nm to approximately 30 nm.
  • The particle size distribution of the micelles was measured according to the principle of dynamic light scattering in a 180° backscattering system, using laser light having a wavelength of 780 nm. Due to the small particle sizes, the formation of a liquid which is clear, in particular for perception by the human eye, is advantageously achieved. The clarity of the solubilisate may also be represented by its low turbidity.
  • To this end, the following working hypothesis is used: The clearer an aqueous dilution of a solubilisate or some other formulation of curcumin, the better its solubilization. The better the solubilization, the better the bioavailability.
  • The solubilisate according to the invention is further characterized in that the total curcuminoid concentration in human blood plasma, measured one hour after oral administration of 500 mg curcumin in the form of the solubilisate, is approximately
    • 500 ng curcuminoid per ml plasma ±100 ng curcuminoid per ml plasma. In contrast, when native curcumin is taken orally in powdered form, only approximately 1.3 ng curcuminoid per ml plasma is achieved after one hour.
  • The human study on which these values are based was conducted on 24 healthy persons between 19 and 29 years of age, who received a single oral dose of 500 mg native curcumin or curcumin in the form of the solubilisate according to the invention. Blood samples were withdrawn at various times over a period of 24 hours after the curcumin was taken. To minimize the possible concurrent influence of digested food, the test subjects were served standardized meals. One hour after taking the curcumin in native form, less than 1 nmol/l plasma was measured; 8 hours after administration, 2.4 nmol/l was measured; and 24 hours after administration, 2.4 nmol/l was measured. In contrast, for curcumin from the solubilisate according to the invention, one hour after administration, 1,964 nmol/l was measured in the blood plasma; 8 hours after administration, 307.1 nmol/l was measured; and 24 hours after administration, 67.7 nmol/l was measured. A solubilisate containing 66.5% by weight curcumin was used (the commercial product “6% NovaSOL Curcumin” of the applicant). Thus, the curcumin concentration in the blood plasma showed increases by a factor between 36 and 2800 as a result of the formulation as solubilisate according to the invention, compared to native curcumin.
  • The area under the curve of the total curcumin concentration in the blood plasma (area under the total curcumin plasma concentration-time curve (AUC)), measured over a period of 24 hours, was 42.6 nmol h/L for administration of native curcumin, and 9,821.4 nmol h/L for administration of the solubilisate according to the invention. In somewhat generalized terms, it may be said that the plasma AUC of the curcumin solubilisate according to the invention over 24 hours is in the range of approximately 9,500 to approximately 10,000 nmol h/L.
  • Accordingly, the bioavailability of the 66.5% curcumin solubilisate is much better than that of the native form. Viewed as the plasma AUC over 24 hours, the bioavailability as a result of the formulation according to the invention of the solubilisate is approximately 230 times higher.
  • This may be deduced from the particularly low turbidity of the solubilisate, which may be understood as a type of indicator of the bioavailability. The turbidity of the solubilisate according to the invention is less than 30 FNU, preferably less than 20 FNU, and particularly preferably is in the range between 0.5 FNU and 2 FNU, determined by scattered light measurement with infrared light according to the requirements of the ISO 7027 standard at a dilution of the solubilisate in water in a ratio of 1:1000.
  • The solubilisate according to the invention maintains this low turbidity after 24 hours storage at 21° C. and pH 7, as well as after 1 hour storage at 37° C. and pH 1.1, i.e., under storage conditions on the one hand at room temperature in aqueous dilution, and on the other hand, during passage through the stomach. Therefore, according to the present knowledge of the inventor, the curcumin in the solubilisate according to the invention is still present in the form of the stable, very small micelles even after passage through the stomach, and may therefore by absorbed particularly well in the further digestive tract.
  • For experimentally determining the turbidity, the turbidity measuring devices are calibrated with a standard suspension. Thus, the indication is provided not in the form of the measured light intensity, but, rather, as the concentration of the calibration suspension. During the measurement of any given suspension, the indication thus signifies that the liquid in question has caused the same light scattering as the standard suspension of the indicated concentration. The internationally established turbidity standard is formazin. The most commonly used units are “FNU” (formazin nephelometric units). This is the unit that is used, for example, in water treatment for the measurement at 90° according to the requirements of the ISO 7072 standard. The turbidity of the solubilisate according to the invention is less than 30 FNU, preferably less than 20 FNU, and is particularly preferably in the range between 0.5 FNU and 2 FNU, determined by scattered light measurement with infrared light according to the requirements of the ISO 7027 standard at a dilution of the solubilisate in water in a ratio of 1:1000.
  • Depending on the application, the solubilisate according to the invention may contain up to 5% by weight water and/or between 12% by weight and 20% by weight glycerin.
  • It has advantageously been found that the solubilisate according to the invention may be easily provided in capsules for oral administration, since it does not attack the capsules. The invention thus also provides a capsule filled with the solubilisate, wherein the capsule may be formed as a soft gelatin capsule or hard gelatin capsule, or as a soft gelatin-free capsule or as a hard gelatin-free capsule.
  • An additional administration form is a fluid containing the solubilisate according to the invention, wherein the fluid may be a food, a beverage, a cosmetic product such as a cream, lotion, or salve in particular, or a pharmaceutical product. In particular, the fluid may comprise an aqueous dilution of the solubilisate. The usability of the according to the invention in a fluid is not bound to its viscosity; the solubilisate may likewise be incorporated into hydrophilic as well as lipophilic media.
  • Exemplary embodiments of solubilisates according to the invention are explained below.
  • The particle size measurements were carried out using a ParticleMetrix NANOTRAC backscattering particle analyzer. The measuring principle is based on dynamic light scattering (DLS) in a 180° heterodyne backscattering system. In this geometry, a portion of the laser beam is mixed with the scattered light. This has the same positive effect with regard to the signal/noise ratio as the superimposition of all light wavelengths in a Fourier spectrometer. The color of the sample has no influence on the quality of the measurement. The measurements were carried out in a 1:1000 aqueous dilution. To this end, the solubilisate was dissolved in water with stirring. The solubilisate is soluble in water, in which it is completely clear. This solution is stable and transparent.
  • EXAMPLES Example 1: Curcumin Solubilisate Containing Polysorbate 80
  • Only 930 g polysorbate 80 and 70 g 95% curcumin powder are used for producing the solubilisate. The 70 g contains 95% curcumin, i.e., 66.5 g of curcumin.
  • Commercially available preparations such as TEGO SMO 20 V, InCoPa, or Crillet 4/Tween 80-LQ-(SG), Croda, or Lamesorb SMO 80, Cognis are usable as polysorbate 80. Commercially available preparations may likewise be used as 95% curcumin powder, for example Oleoresin Turmeric 95% (curcumin powder), Jupiter Leys, or Curcumin BCM-95-SG, Eurochem, or Curcumin BCM-95-CG, Eurochem, or Curcuma Oleoresin 95%, Henry Lamotte.
  • The polysorbate 80 is heated to approximately 48° C. to approximately 52° C. The curcumin powder is slowly added to the polysorbate 80, with stirring. During the addition of the curcumin powder, further heating to approximately 87° C. to approximately 91° C. is carried out. The resulting solubilisate is cooled to below approximately 60° C., and is then ready for filling.
  • The solubilisate is yellow-orange to reddish, very dark, intensely colored, and transparent.
  • The curcumin portion may be increased to approximately 10% by weight at the expense of the polysorbate 80 portion.
  • Example 2: Curcumin Solubilisate Containing Polysorbate 20
  • Only 894 g polysorbate 20 and 106 g 95% curcumin powder are used for producing the solubilisate. The 106 g contains 95% curcumin, i.e., 100.7 g of curcumin.
  • Commercially available preparations such as TEGO SML 20 V, InCoPa, or Tween 20, Crillet, 1-LQ-(SG), Croda, or Lamesorb SML 20, Cognis are usable as polysorbate 80.
  • Commercially available preparations may likewise be used as 95% curcumin powder, for example Oleoresin Turmeric 95% (curcumin powder), Jupiter Leys, or Curcumin BCM-95-SG, Eurochem, or Curcumin BCM-95-CG, Eurochem, or Curcuma Oleoresin 95%, Henry Lamotte.
  • The polysorbate 20 is heated to approximately 63° C. to approximately 67° C. The curcumin powder is slowly added to the polysorbate 20, with stirring. During the addition of the curcumin powder, further heating to approximately 83° C. to approximately 87° C. is carried out. The resulting solubilisate is slowly cooled to below approximately 45° C., and is then ready for filling.
  • The solubilisate is yellow-orange to reddish, very dark, intensely colored, and transparent.
  • The curcumin portion may be varied at the expense of the polysorbate 80 portion.
  • Photographs of samples of various curcumin formulations are shown in appended FIG. 1. The left side of the illustration shows the samples 24 hours after addition to water at a temperature of 21° C., under neutral conditions (pH 7). The right side of the illustration shows the samples under physiological conditions 1 hour after addition to water at a temperature of 37° C., under conditions as in the stomach (pH 1.1). In each case, enough water was added to the starting preparations to give a curcumin concentration of 11.4 g/L in the illustrated sample.
  • In particular, the following formulations were compared:
  • Sample A
  • Curcumin extract, native form, powder, 95% curcumin (BCM 95). 12 g of the powder was introduced into 1 liter of water.
  • Sample B
  • 17.5% curcumin micronisate, powder, RAPS. 65.1 g of the powder was introduced into 1 liter of water.
  • Sample C
  • 13% curcumin-formulation, powder, Wacker Chemie. 87. 7 g of the powder was introduced into 1 liter of water.
  • Sample D
  • Curcumin solubilisate according to the invention according to Example 1. 200 g of the liquid solubilisate was introduced into 1 liter of water.
  • Sedimentation and phase separation were observed for samples A, B, and C, at room temperature under neutral conditions and also at 37° C. and acidic conditions,
  • whereas sample D was clear and homogeneous. The solubilisate according to the invention also showed no phase separation and no sedimentation over the entire temperature range from −20° C. to 100° C. Furthermore, sample D showed a fairly intense red coloring, at room temperature under neutral conditions and also at 37° C. and acidic conditions, as the result of which the sample appears much darker in a black and white photograph than samples A, B, and C, which have a yellowish-orange color.
  • It is apparent to one skilled in the art that the invention is not limited to the exemplary embodiments described above, but, rather, may be varied in numerous ways. In particular, the features of the individual exemplary embodiments may also be combined with one another or interchanged with one another.

Claims (12)

1. Solubilisate composed of
curcumin in a quantity of less than or equal to 10% by weight, preferably less than or equal to 7.5% by weight, particularly preferably 6% by weight, and
at least one emulsifier having an HlB value in the range between 13 and 18, in particular polysorbate 80 or polysorbate 20 or a mixture of polysorbate 20 and polysorbate 80,
wherein the average diameter of the micelles loaded with curcumin is between 5 nm and 40 nm, preferably between 6 nm and 20 nm, particularly preferably between 7 nm and 10 nm.
2. Solubilisate according to claim 1, characterized in that the width of the diameter distribution of the micelles ranges from approximately 4 nm to approximately 30 nm.
3. Solubilisate according to one of the preceding claims,
characterized in that the total curcuminoid concentration in human blood plasma, measured one hour after oral administration of 500 mg curcumin in the form of the solubilisate according to one of the preceding claims, is approximately 500 ng curcuminoid per ml plasma ±100 ng curcuminoid per ml plasma.
4. Solubilisate according to one of the preceding claims, characterized in that the total curcuminoid concentration in human blood plasma, measured over a period of 24 hours as the area under the total curcumin plasma concentration-time curve (area under the total curcumin plasma concentration-time curve AUC), is in the range of approximately 9,500 to approximately 10,000 nmol h/l.
5. Solubilisate according to one of the preceding claims, characterized in that the turbidity of the solubilisate is less than 30 FNU, preferably less than 20 FNU, and particularly preferably is in the range between 0.5 FNU and 2 FNU, determined by scattered light measurement with infrared light according to the requirements of the ISO 7027 standard at a dilution of the solubilisate in water in a ratio of 1:1000.
6. Solubilisate according to one of the preceding claims, characterized in that the turbidity of the solubilisate after 24 hours storage at 21° C. and pH 7 is less than 30 FNU, preferably less than 20 FNU, and particularly preferably is in the range between 0.5 FNU and 2 FNU, determined by scattered light measurement with infrared light according to the requirements of the ISO 7027 standard at a dilution of the solubilisate in water in a ratio of 1:1000.
7. Solubilisate according to one of the preceding claims, characterized in that the turbidity of the solubilisate after 1 hour storage at 37° C. and pH 1.1 is less than 30 FNU, particularly preferably less than 20 FNU, and particularly preferably is in the range between 0.5 FNU and 2 FNU, determined by scattered light measurement with infrared light according to the requirements of the ISO 7027 standard at a dilution of the solubilisate in water in a ratio of 1:1000.
8. Solubilisate according to one of the preceding claims, characterized in that the solubilisate contains up to 5% by weight water.
9. Solubilisate according to one of the preceding claims, characterized in that the solubilisate contains between 12% by weight and 20% by weight glycerin.
10. Capsule filled with a solubilisate according to one of the preceding claims, characterized in that the capsule is formed as a soft gelatin capsule or hard gelatin capsule, or as a soft gelatin-free capsule or as a hard gelatin-free capsule.
11. Fluid containing a solubilisate according to one of claims 1 to 10, characterized in that the fluid is selected from the group comprising foods, beverages, cosmetics, and pharmaceutical products.
12. Fluid according to claim 11, characterized in that the fluid comprises an aqueous dilution of the Solubilisate.
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BR112015014654B1 (en) 2020-08-18
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HK1211801A1 (en) 2016-06-03
KR20180007005A (en) 2018-01-19

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