Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/02—Cosmetics or similar toiletry preparations characterised by special physical form
  • A61K8/04—Dispersions; Emulsions
• • A—HUMAN NECESSITIES
  • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
  • A23D—EDIBLE OILS OR FATS, e.g. MARGARINES, SHORTENINGS OR COOKING OILS
  • A23D7/00—Edible oil or fat compositions containing an aqueous phase, e.g. margarines
  • A23D7/005—Edible oil or fat compositions containing an aqueous phase, e.g. margarines characterised by ingredients other than fatty acid triglycerides
  • A23D7/0053—Compositions other than spreads
• • A—HUMAN NECESSITIES
  • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
  • A23D—EDIBLE OILS OR FATS, e.g. MARGARINES, SHORTENINGS OR COOKING OILS
  • A23D7/00—Edible oil or fat compositions containing an aqueous phase, e.g. margarines
  • A23D7/005—Edible oil or fat compositions containing an aqueous phase, e.g. margarines characterised by ingredients other than fatty acid triglycerides
  • A23D7/0056—Spread compositions
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K31/00—Medicinal preparations containing organic active ingredients
  • A61K31/70—Carbohydrates; Sugars; Derivatives thereof
  • A61K31/7028—Compounds having saccharide radicals attached to non-saccharide compounds by glycosidic linkages
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K36/00—Medicinal preparations of undetermined constitution containing material from algae, lichens, fungi or plants, or derivatives thereof, e.g. traditional herbal medicines
  • A61K36/18—Magnoliophyta (angiosperms)
  • A61K36/88—Liliopsida (monocotyledons)
  • A61K36/899—Poaceae or Gramineae (Grass family), e.g. bamboo, corn or sugar cane
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
  • A61K47/44—Oils, fats or waxes according to two or more groups of A61K47/02-A61K47/42; Natural or modified natural oils, fats or waxes, e.g. castor oil, polyethoxylated castor oil, montan wax, lignite, shellac, rosin, beeswax or lanolin
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/02—Cosmetics or similar toiletry preparations characterised by special physical form
  • A61K8/0295—Liquid crystals
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/02—Cosmetics or similar toiletry preparations characterised by special physical form
  • A61K8/04—Dispersions; Emulsions
  • A61K8/06—Emulsions
  • A61K8/062—Oil-in-water emulsions
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/02—Cosmetics or similar toiletry preparations characterised by special physical form
  • A61K8/14—Liposomes; Vesicles
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
  • A61K8/92—Oils, fats or waxes; Derivatives thereof, e.g. hydrogenation products thereof
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
  • A61K8/92—Oils, fats or waxes; Derivatives thereof, e.g. hydrogenation products thereof
  • A61K8/922—Oils, fats or waxes; Derivatives thereof, e.g. hydrogenation products thereof of vegetable origin
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K9/00—Medicinal preparations characterised by special physical form
  • A61K9/10—Dispersions; Emulsions
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K9/00—Medicinal preparations characterised by special physical form
  • A61K9/10—Dispersions; Emulsions
  • A61K9/107—Emulsions ; Emulsion preconcentrates; Micelles
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K9/00—Medicinal preparations characterised by special physical form
  • A61K9/10—Dispersions; Emulsions
  • A61K9/127—Synthetic bilayered vehicles, e.g. liposomes or liposomes with cholesterol as the only non-phosphatidyl surfactant
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K9/00—Medicinal preparations characterised by special physical form
  • A61K9/10—Dispersions; Emulsions
  • A61K9/127—Synthetic bilayered vehicles, e.g. liposomes or liposomes with cholesterol as the only non-phosphatidyl surfactant
  • A61K9/1271—Non-conventional liposomes, e.g. PEGylated liposomes or liposomes coated or grafted with polymers
  • A61K9/1272—Non-conventional liposomes, e.g. PEGylated liposomes or liposomes coated or grafted with polymers comprising non-phosphatidyl surfactants as bilayer-forming substances, e.g. cationic lipids or non-phosphatidyl liposomes coated or grafted with polymers
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K9/00—Medicinal preparations characterised by special physical form
  • A61K9/10—Dispersions; Emulsions
  • A61K9/127—Synthetic bilayered vehicles, e.g. liposomes or liposomes with cholesterol as the only non-phosphatidyl surfactant
  • A61K9/1274—Non-vesicle bilayer structures, e.g. liquid crystals, tubules, cubic phases or cochleates; Sponge phases
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K9/00—Medicinal preparations characterised by special physical form
  • A61K9/10—Dispersions; Emulsions
  • A61K9/127—Synthetic bilayered vehicles, e.g. liposomes or liposomes with cholesterol as the only non-phosphatidyl surfactant
  • A61K9/1277—Preparation processes; Proliposomes
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
  • A61Q19/00—Preparations for care of the skin
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
  • A61K2800/10—General cosmetic use

Definitions

• This invention refers to a method for preparing a dispersion of polar lipids in an ethanol- water mixture, said polar lipids comprising galactolipids.
• the invention also refers to an oil obtained by evaporating ethanol and water from the dispersion.
• the invention further refers to aqueous colloidal dispersions of polar lipids comprising galactolipids, to an oil containing polar lipids comprising galactolipids and to pharmaceutical, cosmetic and food compositions comprising such dispersions and/or oil.
• Lipids of vegetable origin consist of polar and non-polar components.
• the non-polar lipids are of great importance in foods, providing raw materials for fats or oils.
• the polar lipids are mainly used in order to achieve special functional properties, such as emulsification.
• the term polar lipid is used in this context based on the interaction with water; thus lipids forming aqueous phases are termed polar, whereas a lipid sample which do not form aqueous phases are termed non-polar.
• Polar lipids of vegetable origin are obtained at the so-called degumming step in the refining process of oil crops, such as soy bean oil.
• lipids are dominated by phospholipids.
• Another source of polar lipids is cereals, containing a mixture of phospholipids and galactolipids.
• a fluid was formed containing aggregates of a liquid-crystalline state which as far as we know never earlier has been reported in lipids.
• the molecular organization in this fluid and transformations at water dilution/ethanol evaporation is utilized in our invention.
• Dispersions of the lamellar liquid-crystalline phase in an aqueous environment were first described in the 1960s. These particles consist of spherically concentric lipid bilayers alternating with water layers. They are formed from the lamellar liquid crystalline-phase, the L-alpha phase, by mechanical dispersion in excess of water. Thus a prerequisite is that the L-alpha phase can coexist in equilibrium with a water phase.
• the liposomes prepared from the L-alpha phase consist of several concentric bilayers, and are also termed multilamellar vesicles. There are also specific methods described in the literature for preparations resulting in unilamellar vesicles, which have been applied particularly in drug delivery. This invention describes a new method to prepare monodisperse aqueous dispersions of vesicles of galactolipids and phospholipids of very small size, and the use of such particles.
• Liposomes are usually formed by mechanical homogenization of the lamellar liquid- crystalline phase in excess of water, including ultrasonification and use of valve homogenizers. Commonly used reported methods in the literature involve the dry film method and the ethanol injection method. In order to obtain liposomes or vesicles of uniform size, molecular sieve methods have been used.
• the interaction of cereal lipids with water has been analysed in detail in the case of wheat lipids, which resulted in the ternary phase diagram shown in Figure 1 . Similar phase equilibria occur also for oat lipids as shown below.
• the phase diagram shows phase equilibria of wheat lipids and water at room temperature.
• the polar and non-polar wheat lipid components were first separated and then reconstituted in different proportions before equilibration with water.
• Two liquid-crystalline phases exist - the lamellar (LC-L) and the inverse hexagonal (LC-H) and one liquid phase ( L ) as identified by X-ray diffraction.
• the broken line shows the composition polar/non-polar lipids in the wheat endosperm (after Larsson et al. 2006 Lipids: Structure, Physical properties and
• the starting material in this invention contains ethanol.
• a fourth dimension is introduced.
• Hll-gel occurs when the lipids are diluted in water, see Example 1 . Once formed it takes very long time to dissolve the Hll- gel. At room temperature the time scale is years.
• the Hll-phase is always formed before the L-alpha phase, see Example 1 , and therefore the prior art methods to produce liposomes in phospholipid systems cannot be applied.
• the Hll-phase is formed in phase diagrams of phospholipids, there appears to be an existence region of the L-aipha phase at lower temperature, where water dilution towards liposomes can take place.
• WO9520944 (US 6.022.561 ) describes "bilayer preparations" which are prepared from chromatographically purified cereal extracts resulting in a polar lipid concentration of
• the small unilamellar vesicles we obtain have average particle size below 100nm.
• the cubosomes we describe cannot be formed by their technology. Note also that we achieve much smaller particles using polar lipids with a much lower purity.
• WO 2009/131436A1 describes a yoghurt product with an oil-in-water emulsion for satiety enhancement, and in the formulation of the complex mixture they use galactolipids as emulsifier (claim 3), and also oat lipids are mentioned (claim 4).
• WO 2009/068651 A1 describes an O/W emulsion for lowering cholesterol by phytosterols as a component in all claims. Galactolipids are used as emulsifier. Particle sizes are not given.
• monoglycerides are introduced into the cereal lipid mixture.
• Obesity is a big and increasing problem in the western society. It has been estimated that $45 billion of US healthcare costs, or 8% per annum of total healthcare spend, is a direct result of obesity. Traditional approaches to long term weight management such as diet and exercise have proved ineffective alone to control the spread of obesity. Today, more than ever, there is a considerable interest in developing safe, effective methods for treatment of obesity.
• Cetilistat is another lipase inhibitor disclosed in WO00/40247, (Alizyme Therapeutics, 2000) with similar working mechanism, but with less side effects than orlistat (Kopelman P. et al., Int J Obes 2006; 31 : 465-71 ).
• Energy balance is a homeostatic system. Although malfunctions of this system can cause obesity, the relatively recent increase in the incidence of obesity is not thought to be the result of specific defects, but of a regulatory system unable to cope with the current context of cheap, high-energy foodstuffs, mechanized transport and non-manual labour. Commandeering elements of this regulatory system might provide the best opportunity for us to combat obesity (Murphy K. Bloom S., Nature 2006; 444: 854-859).
• the "ileal brake” is a feedback mechanism activated by nutrients in the intestine, especially fat, with marked effects on satiety. Small amounts of fat are able to induce satiety and influence food intake (Welch I., et al. Gastroenterology 1985; 89: 1293-1297; Welch I., et al. Gut 1988; 29: 306-31 1 ; Greenberg D. and Smith, G.P., Psychosomatic medicine 1996; 58: 559-569; Maljaars PWJ., et al, Int. J. Obesity 2008; 32: 1633-1639).
• WO87/03198 refers to an enteric preparation in the form of a capsule or tablet containing a fat as the active substance that should be released in the intestine.
• This preparation utilizes the ileal brake mechanism.
• This product (Olibra, DSM) is investigated in several studies (Burns A. A. et al., Int. J Obesity 2000; 24: 1419- 1425; Burns A.A.
• Emulsions based on palm oil and proteins from partially denatured egg white as disclosed in WO2006/053647, Unilever, and rapeseed oil or hydrogenated rapeseed oil0 together with milk protein and monoglycerides, as disclosed in WO2006/1 17069, Unilever, are also used to bring fat far down in intestine.
• WO97/13500 refers to liposome formulations having incorporated therein an amount of a 5- ⁇ steroid effective to treat obesity, diabetes or hydrocortocoidism.
• WO03/018529 refers to fatty-acid monoesters of an estrogen and a fatty acid for use in treatment of obesity and overweight.
• the monoester is incorporated in a lipidic suspension prepared from liposomes.
• JP2007204368 refers to a silk peptide as active ingredient useful in treatment of obesity, wherein the silk peptide is incorporated into a liposome.
• Sensitive molecules can be protected against degradation (such as oxidation during storage of the actual food product) and the most important aspect is that the bioavailability of important nutrients can be improved.
• the present invention provides new possibilities in this field.
• One application enables production of very small (smaller than 10Onm), uniform particles of self assembly type. Only limited mixing energy is required in the process.
• the preparation of particles of cubic lipid liquid-crystalline phases can be useful in this field.
• a wide range of molecules can be added into the particles, both hydrophilic and lipophilic molecules.
• a particular advantage is that the lipids we use are components of a common food material, which eliminates safety risks.
• the starting lipid material we use comprises galactolipids as a polar lipid component.
• Galactolipids may form Hll-particles.
• Using traditional emulsifying methods on oils containing galactolipids may fail or become difficult to reproduce because formation of Hll-particles. Large amounts of energy are required to emulsify oil in water. It is difficult to get the particles small enough, to get a sufficient narrow particle size distribution and the variation between batches are very high..
• the invention refers to a method for preparing a dispersion of polar lipids in an ethanol- water mixture, said polar lipids comprising galactolipids, characterized in diluting an oil containing polar lipids comprising galactolipids using a first ethanol-water mixture having an ethanol concentration close to the critical polarity , wherein upon dilution said polar lipids form a lamellar liquid-crystalline phase, without first forming a hexagonal Hll-phase.
• Said first ethanol-water mixture may have an ethanol concentration calculated as volume% based on the total amount of ethanol and water, which is in the range from 15 volume% units, preferably from 10 volume% units and more preferably from 5 volume% units, below the critical polarity of the ethanol-water mixture with respect to said oil to 15 volume% units, preferably to 10 volume% units and more preferably to 5 volume%, above said critical polarity.
• the critical polarity of said first ethanol-water mixture may be in the range 25-75, preferably 30-70, more preferably 35-65, even more preferably 40-60 and most preferably in the range 45-55 volume% ethanol in the solvent phase.
• Dilution of said dispersion may be proceeded with said first ethanol-water mixture and/or a second ethanol-water mixture and/or with water until a colloidal dispersion of said polar lipids is obtained, wherein said polar lipids form colloidal particles in the form of liposomes, cubic particles and/or oil droplets coated by lamellar liquid-crystalline phase .
• the relationship in volume% between ethanol and water in the second ethanol-water mixture used for diluting the polar lipids forming a lamellar liquid crystalline phase in said first ethanol-water mixture may be different than in said first ethanol-water mixture, such that the second ethanol-water mixture may contain a higher proportion of water than the first polar solvent mixture.
• a colloidal dispersion of liposomes may be obtained.
• Said liposomes may have a mean diameter which is less than 100 nm. At least 80% of the liposomes may have a diameter of less than 200 nm.
• Said liposomes may be in the form of unilamellar vesicles having one bilayer of polar lipids.
• Said oil may contain at least 25 weight% monoglycerides of oleic and/or linolic acid as calculated on the total amount of lipids in said oil, wherein following the proceeded dilution of said dispersion comprising said polar lipids a colloidal dispersion of cubosomes may be formed.
• Ethanol may be evaporated from the dispersion to provide an aqueous dispersion containing less than 10 weight%, preferably less than 5 weight% and more preferably less than 1 weight% ethanol.
• the polar lipids may be derived from plants, animals or microbiological species.
• the polar lipids may be derived from cereal grains or leaves.
• the polar lipids may be derived from oat.
• Said polar lipids may also comprise phospholipids.
• Said oil may contain between 30-95, preferably between 30-90 lipid% non-polar lipids and that said dispersion contains at least 30 weight%, preferably at least 40 weight% and more preferably at least 50 weight% total lipids, resulting in an oil-in-water emulsion in which the non-polar lipids form oil droplets that are coated by a lamellar liquid-crystalline phase of said polar lipids.
• Ethanol and water may be evaporated from said dispersion to provide an oil containing less than 1 wt% ethanol.
• Said oil may be derived from oat.
• the invention further refers to an aqueous colloidal dispersion of polar lipids, said polar lipids comprising galactolipids, wherein said polar lipids comprising galactolipids form nano size liposomes having a mean diameter which is less than 100 nm At least 80% of the liposomes may have a diameter of less than 200 nm.
• the liposomes may have a mean diameter which is not more than 80 nm, preferably not more than 60 nm. At least 80%, preferably at least 90% and more preferably at least 99% of the nano size liposomes may have a diameter of less than 100 nm.
• the liposomes may have a mean diameter in the range 30-60 nm, preferably in the range 40-50 nm.
• the liposomes may be unilamellar vesicles having one bilayer of polar lipids.
• At least 25 weight% may be monoglycerides of oleic and/or linolic acid as calculated on the total amount of lipids, said polar lipids comprising galactolipids, wherein the polar lipids comprising galactolipids and the monoglycerides form colloidal cubosomes.
• the polar lipids may be derived from plants, animals or microbiological species.
• the polar lipids may be derived from cereal grains or leaves.
• the polar lipids may be derived from oat.
• the polar lipids may also comprise phospholipids.
• the liposomes and/or cubosomes may contain at least 50 lipid% of polar lipids, preferably at least 60 lipid% and more preferably at least 75 lipid% of polar lipids, the rest of the lipids being non-polar lipids, wherein lipid% refers to the weight% of polar lipids calculated on the total amount of lipids.
• the liposomes may contain at least 2 lipid%, preferably at least 5 lipid% and preferably at least 10 lipid% of non-polar lipids, the rest of the lipids being polar lipids, wherein lipid% refers to the weight% of non-polar lipids calculated on the total amount of lipids.
• the dispersion may have a dry solid content of less than 20 weight%.
• the invention further refers to an aqueous colloidal dispersion in the form of an oil-in- water emulsion of polar lipids comprising galactolipids and non-polar lipids, wherein the non-polar lipids form oil droplets that are coated by a lamellar liquid-crystalline phase of said polar lipids.
• the invention also refers to an aqueous colloidal dispersion obtainable by a method defined above.
• the invention also refers to an oil containing polar lipids comprising galactolipids, wherein said oil contains less than 1 wt% ethanol and less than 3 wt% sugar, preferably less than 2 wt% sugar and more than 25wt% polar lipids, preferably more than 30wt% polar lipids and said oil is also characterized in forming less hexagonal phase than lamellar liquid- crystalline phase during a following water swelling process which results in a spontaneous emulsification.
• Said oil may be derived from oat.
• the invention further refers to an aqueous colloidal dispersion as defined above or obtainable according to the method as defined above for use as a medicament.
• the invention further refers to an aqueous colloidal dispersion and/or oil as defined above or obtainable according to the method as defined above for treatment of obesity, increased blood lipid levels, diabetes type II and/or autoimmune diseases including rheumatoid arthritis and multiple sclerosis.
• the invention further refers to the use of an aqueous colloidal dispersion and/or oil as defined above or obtainable according to the method as defined above for the
• the invention further refers to a pharmaceutical formulation
• a pharmaceutical formulation comprising an aqueous colloidal dispersion and/or oil as defined above or obtainable according to the method as defined above optionally in admixture with a pharmaceutically acceptable adjuvant, diluent or carrier.
• the dispersion and/or oil may act as an active ingredient or it may act as a carrier for release of an active ingredient.
• the invention further refers to a cosmetic composition
• a cosmetic composition comprising an aqueous colloidal dispersion and/or oil as defined above or obtainable according to the method as defined above.
• the invention further refers to a food composition or food supplement composition comprising an aqueous colloidal dispersion and/or oil as defined above or obtainable according to the method as defined above.
• the food composition or food supplement composition may be margarine, oil, cream, milk, yoghurt, cheese, flour, juice, shot or soft drink.
• the invention further refers to an animal feed composition comprising an aqueous colloidal dispersion and/or oil as defined above or obtainable according to the method as defined above.
• the invention also refers to an article comprising an aqueous colloidal dispersion and or an oil as defined above or obtainable according to the method as defined above.
• the invention further refers to a method of treating and/or preventing obesity, reducing blood lipid levels, diabetes type II and/or autoimmune diseases comprising the
• Colloidal dispersions are homogenous aqueous phases containing particles in the size range 1 - 1000 nm.
• Critical polarity defines the concentration of ethanol and water of the solvent system when a solvent-in-oil emulsion is transformed into an oil-in-solvent emulsion and this critical polarity can be detected by viscosity or microscopy.
• viscosity the viscosity starts to increase rapidly when increasing the polarity from the critical polarity.
• the liposomes become much smaller when the polarity is increased from the critical polarity.
• the size of the particles starts to decrease very fast when the polarity is increased from the critical polarity.
• the critical polarity is in the range 25-75 vol%, preferably 30-70vol%, more preferably 35 -65vol%, even more preferably 40- 60vol% and most preferably 45-55 vol% ethanol in the solvent phase, wherein the solvent phase is as defined below.
• the dry solid of the system should be in the range 10- 80wt%, more preferably 15 -70wt%, mostly preferred 20-65wt%;and the ethanol concentration in the solvent phase should cover the critical polarity.
• Example 2 describes a method to determine the critical polarity.
• the ethanol concentration in the first ethanol-water mixture should be in the range ⁇ 15vol% from the critical polarity, more preferably in the range ⁇ 10vol% from the critical polarity and most preferably in the range ⁇ 5vol% from the critical polarity.
• An oil is a liquid lipid phase containing non-polar lipids, polar lipids and ethanol, and it can also contain small amounts of water and sugar.
• Solvent phase is a simplified calculated phase containing all ethanol and water in the system, without consideration of different concentration in different true phases
• EtOH vol% in solvent phase is the calculated ethanol concentration in the solvent phase of the mixture used without consideration of different concentration in different phases.
• E40, E42, E45, E50, E55, E60, Exx means solutions of water and ethanol with an ethanol concentration at 40, 42, 45, 50, 55, 60 and xx vol% ethanol, respectively.
• FIG 1 The interaction between wheat lipids and water as described by this ternary phase diagram determined at room temperature by equilibrating mixtures of polar and non-polar wheat lipid components with water. The phases are described in the text.
• Figure 2 The T2 stem solution viewed in the polarizing microscope. Birefringent particles with characteristic so-called batonnet shapes are seen in equilibrium with the isotropic fluid.
• FIG 3. The picture is taken after addition of a small amount of water, but below the limit of swelling, to the same fluid as shown in Figure 1.
• the added water induces a transformation into the Hll-phase both within the batonnet that is shown and in the surrounding outside fluid.
• the water swelling inside the original batonnet results in a transition into the Hll-phase, with its characteristic strong birefringence interference colors.
• FIG. 4 A liposomal dispersion of the T7 stem solution was diluted to an ethanol-water composition of 55:45 (v/v) and a lipid content of 10 % (w/w). Only textures characteristic for the L-alpha phase is seen, with liposomes showing Maltesi-cross textures.
• Figure 5. The Dry Solid in wt% vs EtOH vol% in solvent phase for PL0126 when diluted with water. The borderlines for the" Hll-phase formation" range are given. Note that the composition of the oil passes through the HII -range during dilution with water and that the process line is not a straight line using these units.
• Figure 1 The Dry Solid in wt% vs EtOH vol% in solvent phase for PL0126 when first diluted with 9 parts of E45 and then the mixture is diluted with water and the ethanol is then removed by evaporation using a batch process.
• Both lipophilic and hydrophilic active ingredients can be incorporated in the different types of lipid particles and used in order to increase bioavailability of important nutrients.
• the particle dispersions can be mixed into food or used as they are as so-called shots.
• the particle dispersions can also be used in pharmaceuticals, cosmetics, agrochemicals and feed mixed with other components or used alone.
• Ethanol-water solutions of lipids as dealt with in this invention have obvious advantages compared to other systems involving organic solvents when dealing with foods or pharmaceuticals, and important applications involve processes in order to form aqueous lipid dispersions.
• One example is preparation of liposomes by the ethanol injection method.
• Crude oat oils contain about 15wt% polar lipids. These polar lipids are rich in galactolipids and particularly in di-galactosyl-di-acyl-glyceride (DGDG).
• DGDG di-galactosyl-di-acyl-glyceride
• the term "rich in galactolipids” refers to that at least 30wt% of the polar lipids are galactolipids.
• the oat DGDG is unique because some of the DGDG contains one or more unsaturated hydroxyl-fatty acids, which are esterified by other fatty acids. Molecules containing fatty acids with esterified hydroxyl- fatty acids are called estolides. Natural estolides exists only in oats (WO 88/08253, Jee M.H.
• the gei described here phenomenoiogicai was identified in the polarizing microscope by its birefringence texture as an Hll-phase, as further described below.
• the composition of the T2-fraction is described in Table 1.
• Stem solution T2 looks like a homogeneous oily phase with high viscosity.
• rod-shaped particles are seen which are strongly birefringent, as shown in Figure. 2.
• Their presence and orientation at flow explain the viscous properties of the fluid.
• Such particles were first described in 1910 by Friedel and Grandjean, and termed batonnets (in French - and later this name is used also in English) due to the regular elongated shape with mirror symmetry over a middle-axis.
• Such liquid-crystalline particles have been shown to consist of stacks of soft lamellae of uniform thickness.
• the geometric packing constrains of such curved lamellae induce the so-called focal-conic texture, which explains the outer particle shape as seen in the polarizing microscope.
• This lamellar structure has also been termed smectic in the literature.
• the ordered molecules at the particle surface exist in dynamic equilibrium with disordered molecules in the outside isotropic fluid.
• liquid-crystalline phases occurring in aqueous systems of polar lipids have been well characterized since their first description in the 1960s. They consist of interfaces formed by the polar heads arranged in different geometrical patterns, separating hydrocarbon chain regions from aqueous regions. Their structures are lamellar, hexagonal and cubic, with the phases L-alpha and HII utilized in the present invention being the most common two phases. As these liquid-crystalline phases contain water (or a solvent) they are termed lyotropic liquid crystals. When ethanol is present in the water medium, it could be expected that there is a treasure concentration of ethanol for this type of phase behaviour, and above this concentration no aqueous regions are formed.
• thermotropic liquid-crystalline phase consisting of lipid molecules, only without any inside region of solvent molecules. This phase exists in equilibrium with the outside isotropic solution, with its laminar structure, forming the batonnet organization shown in Figure 2.
• the T3 type of dispersed lipid particles is obtained as described in example 3 below.
• T7 is described in Table 1. Like the stem solution of T2, also T7 stem solution appears homogeneous regarded by the naked eye, but shows birefringent batonnet particles in the isotropic fluid in the polarizing microscope.
• the small size may provide an important advantage in the applications that we consider.
• the inner monolayer of the vesicle bilayer could be enriched in lipid molecules with a larger cross-section area at the methyl end group region, with molecules like the DGDG estolides.
• the outer monolayer on the contrary could be enriched in molecules with an 5 opposite molecular shape, with larger cross-section area at the polar head group region compared to the methyl end group region, for example digalactosyl-monoglycerides.
• T2 stem solution contains a rather high proportion of triglyceride molecules, about 30 lipid%, which seems to be solubilized within the bilayer.
• the final product had a dry solid content of 10wt%; the content of ethanol was below 0.1 wt% and for the best process the resulting unilamellar vesicles were in the range of 40-50nm.
• the very small particles and the very narrow particle size distribution is thus also due to that the lipids only get in touch with a solvent phase with a very specific concentration of ethanol close to the critical concentration.
• oils containing galactolipids can be free from HII crystals and the oils remain easy to handle and the oils keep their high emulsifying capacity also after removal of the ethanol, see Example 8.
• the product in the example contained less than 1 %wt ethanol and less the 3wt% sugar.
• This oil is exposed to water it is forming less hexagonal phase than lamellar liquid- crystalline phase during a following water swelling process, which results in a
• the concentration of polar lipids should be more than 25wt% polar lipids, preferably more than 30wt% polar lipids, and that the polar lipids from oats is particularly suitable.
• the step-wise water-ethanol dilution/ethanol-evaporation of the ethanol-water solution of the oat lipid fractions, described above, can also be applied in order to prepare particles of bicontinuous cubic phases.
• This process makes possible improved control of particle size distribution by sequential co-precipitation of an L-alpha-phase, together with a cubic phase.
• the particle size is controlled by the kinetics of the build-up of surface zones of the particles.
• Example 4 ethanol/water mixture of 50%. This mixture is then mixed with an ethanol-water mixture of about 30 wt% ethanol. The exact ethanol concentration in this stage is determined in a way analogous to the procedure described in Example 2. The amount of the ethanol and water mixture added is determined in analogy to that given in Example 3. Finally, water is added and if required ethanol is evaporated in analogy to the description in Example 4. These conditions are pre-determined and adjusted by trial and error and can then be applied in a reproducible way in large scale processes.
• a useful concept in our preparation process is the critical polarity which defines the concentration of ethanol and water when a water-in-oil emulsion is transformed into an oil- in-water emulsion when the polarity is increased, see definitions.
• critical polarity defines the concentration of ethanol and water when a water-in-oil emulsion is transformed into an oil- in-water emulsion when the polarity is increased.
• At water concentration in the added solvent medium slightly above the critical polarity has been observed to give ideal condition for initiating the precipitation of the cubic particles.
• At the critical polarity for an oil-water interfacial monoolein film formation should be expected to induce nucleation of the liquid-crystalline phases. This might be one reason for the improved possibilities to produce uniform particles by this process, as the passage of the liquid crystal phase boundaries can take place slowly in a controllable way. Water addition directed towards the water corner will result in a faster and less controllable precipitation. This difference will be particularly important in large scale process.
• the starting lipid material we use comprises galactolipids as a polar lipid component.
• Galactolipids are very efficient emulsifiers. They are naturally present in the original oat oil ethanol extract and they can produce an oil-in-water emulsion when the non-polar lipid concentration is about 50 up to 95 lipid% by applying our ethanol-water-dilution/ethanol- evaporation process. At lower concentration of non-polar lipids liposomes are formed by applying our ethanol-water-dilution/ethanol-evaporation process.
• Hll-particles may form Hll-particles, which may by formed using traditional methods to produce emulsions. Once formed, oil containing Hll-particles has lost most of its emulsifying properties.
• ethanol-water-dilution/ethanol-evaporation process we can avoid the formation of Hll-particles in oils containing galactolipids. With these methods the full potential in the lipids are utilized, see Example 9. Non-polar lipids of other origin can also be added to the oil before the dilution and evaporation processes start.
• Hydrophilic additives can sometimes be solubilized in the water core of the particles if they are added as a solution in the aqueous phase which is used in dilution of the T2 or T7 stem solution into a T3 type of dispersion. The solubilized molecules will then enter the water compartments of the particles, provided that the molecules are small enough. The excess of additive which remains in the outside continuous water phase can then be removed by dialysis.
• vesicle dispersions according to this invention associate to the lipase present in the intestine.
• the small size of the vesicles and their long life-time in the intestinal system are important features. This opens a possibility for food products with improved function in appetite regulation.
• the incorporation of the drug into the vesicles was described in the introduction to paragraph 4 above.
• Molecules which are hydrophilic might be added to a pre-prepared dispersion and spontaneously became integrated.
• the vesicles may incorporate hydrophilic molecules by transient opening/closing processes, for example by
• Hydrophobic active molecules are preferably solved together with the starting material of lipids in ethanol used in the water-precipitation/ethanol-evaporation process. Hydrophobic molecules which also are water soluble can be added directly to the final formulation where the molecules will be partitioned between the aqueous and lipid regions.
• Galactolipids in rose hips have been shown to provide immunomodulating effect and is used for pain relief in joint inflammation conditions (R. Christensen, E. Bartels, R. Altman, A. Astrup, Bliddal, H. Osteoarthritis and Cartilage 16 (2008) 965 - 972.) It seems likely that our oat lipid galactolipids will have similar effects and have application in therapy for autoimmunological diseases, such as rheumatoid arthritis and multiple sclerosis. A particular advantage might be the particle size and shape, as being one significant factor in recognition by the immune system. About one half of the immune system in humans is located in the gastrointestinal region.
• lipophilic food components with a tendency to be oxidized during storage in food products are protected when they are incorporated in the lipid region of liquid-crystalline phases.
• Lycopen, lutenin and coenzyme Q10 are examples where an incorporation into unilamellar vesicles or vesicles of this invention may provide possibilities to manufacture products with increased bioavailability.
• Hydrophilic compound can be incorporated in the aqueous compartments of the lipid particles in the same way as described in the case of drugs above. Another example of a compound where the bioavailability is very low is curcumin.
• Example 1 illustrates how the prior art works applied on lipids containing galactolipids.
• Example 1 Preparation of an aqueous gel of Hll-type.
• the liquid-crystalline HII phase is formed which can be unambiguously identified by its birefringent texture.
• the H II- phase should ultimately be transformed into an L-alpha phase but this transition is extremely slow as mentioned above.
• Once formed it is impossible to disperse this HII- phase gel.
• the gel is floating on the top of the solvent. In some cases the gel can be so hard that it is possible to pick the whole gel as a single piece from the solvent using tweezers.
• PL0126 a fractionated oat oil of type T2.
• the composition of PL0126 was: 65lipid% of polar lipids; 25wt% solvent and the concentration of ethanol in this solvent phase was 55vol%. This is illustrated as PL0126 in Figure 6.
• the concentration of ethanol in the solvent mixtures was 60, 55, 50, 45 and 40 vol%, respectively. These ethanol solutions are denoted as E60, E55, E50, E45 and E40, respectively, in the rest of this document.
• the compositions in these five tubes were calculated and the results are illustrated as PL0126+E60, PL0126+E55, PL0126+E50, PL0126+E45 and PL+E40, respectively, in Figure 6.
• all water and all ethanol data is considered as the average composition of the total mixture. Whether there at certain compositions exists an immiscibility gap between water and ethanol or not is not taken into account. We found this as a practically useful simplification to describe the system. After this dilution the dry solid content became about 15wt%.
• E45 all particles was below 1 pm. Thus, the particle size starts to decrease rapidly at a polarity higher than E50 but at a polarity lower than E45.
• a stem solution of type T2, PL0126 was diluted with 9, 19 and 39 parts of E55, respectively. These samples was in turn diluted with pure water, see Figure 8. The concentrations were calculated as in Example 2. The viscosity and phase behaviour was observed visually and in light microscope.
• Stem solutions have been diluted by different ethanol-water solutions, followed by addition of water and evaporation of the ethanol in a rotating lab evaporator.
• the compositions of the mixtures were calculated in the same way as in Example 2.
• the particle size was investigated by polarizing light microscope and such samples were taken at different steps in the process.
• the dry solid When the evaporation is performed in a rotating lab evaporator the dry solid can be increased to about 10 wt% and the dispersion remain low viscous all the time. When the dry solid exceed about 10wt% the dispersion becomes high viscous.
• the process lines for three examples are illustrated in Figures 10-12. The border between the high viscous and the low viscous region can be extended down to zero in ethanol, see Figures 10-12.
• the product After completed dilution with E50 the product contained a lot of very small particles, smaller than 10OOnm, but also some larger particles, about 5% of the particles were larger then 1000nm. At this stage it was not possible to observe any Maltese crosses in the product. With the methods used, it was not possible to detect that any changes in particle size distribution occurred during to the evaporation process.
• the dilution was performed at a polarity of the first ethanol-water mixture slightly lower than the critical polarity. In this case no second solvent were used or we can say that the second solvent was the same as the first solvent.
• the final product after this procedure is called T3.
• the dispersion was shaken by hand in an evaporation bottle of 1 litre size.
• the composition entered and passed the high viscous region and reached the low viscous dispersion region in the end of the dilution.
• 4 parts of water was added and the evaporation started.
• 1 part of solvent was evaporated, the dispersion became rather viscous and the evaporation was stopped.
• One more part of water was added and the evaporation started again.
• the dispersion became rather viscous and the evaporation was stopped.
• One more part of water was added and the evaporation started again.
• the dilution was performed at a polarity of the first ethanol-water mixture slightly higher than the critical polarity.
• the amount of this solvent was so high that the viscosity was reduced in the end of the dilution procedure, see Figure 1 1 .
• the second solvent was water.
• T3 The final product after this procedure is called T3.
• the dilution was performed at a polarity of the first ethanol-water mixture slightly higher than the critical polarity.
• the second solvent was water. See Figure 12.
• the final product after this procedure is called T3. Samples produced according to this process line were analysed using synchrotron small- angle X-ray scattering analysis. The average particle size of the vesicles was 40-50nm.
• the dilution was performed at a polarity of the first ethanol-water mixture higher than the critical polarity.
• the second solvent was water. See Figure 13.
• the final product after this procedure is called T4.
• the final product had a dry solid content of 10wt%; the content of ethanol was below 0.1 wt% and all the resulting particles were below the detection limit in a light microscope, about l OOOnm, The effects of reduced particle size and improved particle size distribution
• Example 6 Stability tests on different vesicles, type 73.
• the initial average particle size was determined using synchrotron small-angle X-ray scattering analysis.
• the sample with the large vesicles, T3-1 was not stable at pH 3. Thus, we do not expect that these vesicles will remain stable while they pass the stomach.
• the sample with the small vesicles, T3-2 was stable for 10days at pH 3. Thus, we expect that these small vesicles will remain stable while passing the stomach.
• a blinded randomized study with cross-over design was performed on healthy individuals at Lund University hospital and supervised by a clinically experienced MD and PhD.
• 19 subjects consumed 35 g of lipids in a breakfast meal in the form of an oat iipid dispersion, T3-2 as described in this invention, or in the form of a yoghurt control.
• Blood samples were analyzed for triacylglycerol, total-, HDL- and LDL-cholesterol, glucose and gastric hormones PYY and GLP-1 before and four times after the meal. These hormones are generally accepted as markers of satiety.
• Subjective analysis of satiety was measured using a VAS-questionnaire. Participants recorded their food intake before and after the trial.
• the satiety hormone PYY was significantly elevated 5 and 7 hrs after and glucose was lower after 5 hrs with oat lipid dispersion compared to control. This coincided with a prolonged elevation of plasma TG concentration. The subjective sensation of satiety and food intake the remaining time of the test day was not significantly different between the groups.
• This product has poor emulsifying properties.
• T9 The oil produced in this way is called T9.
• This oil has very good emulsifying properties.
• Example 9 Oil-in-Water emulsion prepared using the ethanol-water dilution/evaporation process.
• Sunflower oil and oat oil of type T2, PL090219 were mixed to two different concentrations of polar lipids, 10 and 2lipid%.
• the critical polarity was determined by mixing, 1 ml of oil and 1 ml of different ethanol mixtures (E0, E35, E40, E45, E50, E55, E60), in glass tubes of 5ml and shake the tubes by hand and by a vortex mixer. The viscosity of the samples was observed visually and by shaking. The particle size was observed in microscope with polarized light and phase contrast.
• PhL Phospholipids PC + PE about 50% of PhL
• This ratio is 1 ,0 in crude oat oil
• This ratio is 1 ,0 in crude oat oil

Landscapes

• Health & Medical Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Chemical & Material Sciences (AREA)
• General Health & Medical Sciences (AREA)
• Veterinary Medicine (AREA)
• Public Health (AREA)
• Animal Behavior & Ethology (AREA)
• Epidemiology (AREA)
• Pharmacology & Pharmacy (AREA)
• Medicinal Chemistry (AREA)
• Dispersion Chemistry (AREA)
• Birds (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Natural Medicines & Medicinal Plants (AREA)
• Engineering & Computer Science (AREA)
• Molecular Biology (AREA)
• Food Science & Technology (AREA)
• Polymers & Plastics (AREA)
• Alternative & Traditional Medicine (AREA)
• Biophysics (AREA)
• Biotechnology (AREA)
• Botany (AREA)
• Medical Informatics (AREA)
• Microbiology (AREA)
• Mycology (AREA)
• Crystallography & Structural Chemistry (AREA)
• Dermatology (AREA)
• Medicinal Preparation (AREA)
• Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
• Cosmetics (AREA)

Priority Applications (6)

Applications Claiming Priority (4)

Publications (1)

Family

ID=45004194

Family Applications (1)

Country Status (7)

Families Citing this family (4)

Citations (18)

Family Cites Families (7)

• 2011
  • 2011-05-24 NO NO11786992A patent/NO2575768T3/no unknown
  • 2011-05-24 EP EP11786992.5A patent/EP2575768B1/en active Active
  • 2011-05-24 WO PCT/SE2011/050646 patent/WO2011149416A1/en not_active Ceased
  • 2011-05-24 PL PL11786992T patent/PL2575768T3/pl unknown
  • 2011-05-24 US US13/699,663 patent/US9237762B2/en active Active
  • 2011-05-24 DK DK11786992.5T patent/DK2575768T3/en active
  • 2011-05-24 ES ES11786992.5T patent/ES2662710T3/es active Active

Patent Citations (18)

Non-Patent Citations (18)

Also Published As

Similar Documents

Legal Events