WO2017143421A1 - Sistema nanométrico de liberação prolongada de ativos cosméticos e/ou repelentes - Google Patents
Sistema nanométrico de liberação prolongada de ativos cosméticos e/ou repelentes Download PDFInfo
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- WO2017143421A1 WO2017143421A1 PCT/BR2017/050042 BR2017050042W WO2017143421A1 WO 2017143421 A1 WO2017143421 A1 WO 2017143421A1 BR 2017050042 W BR2017050042 W BR 2017050042W WO 2017143421 A1 WO2017143421 A1 WO 2017143421A1
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Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
-
- 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
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
- A61Q17/00—Barrier preparations; Preparations brought into direct contact with the skin for affording protection against external influences, e.g. sunlight, X-rays or other harmful rays, corrosive materials, bacteria or insect stings
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
- A61Q17/00—Barrier preparations; Preparations brought into direct contact with the skin for affording protection against external influences, e.g. sunlight, X-rays or other harmful rays, corrosive materials, bacteria or insect stings
- A61Q17/02—Barrier preparations; Preparations brought into direct contact with the skin for affording protection against external influences, e.g. sunlight, X-rays or other harmful rays, corrosive materials, bacteria or insect stings containing insect repellants
Definitions
- the present invention is in the fields of Nanotechnology, Chemistry and Pharmacy, being related to a cosmetic composition or insect repellent with active activators of prolonged and / or gradual release.
- the composition of the invention contains stable hydrophilic and hydrophilic chain nanostructures for topical application, and is produced by nanoencapsulation techniques of chemical actives.
- the composition provides prolonged release of cosmetic or repellent active, with high duration of action and safety.
- the skin is the largest organ of the human body and acquires different characteristics in certain areas of the organism, varying thickness and texture.
- the epidermis is the outermost layer and has the function of protecting the skin from aggressions, UV rays and excessive water loss. It is also subdivided into layers, and its most superficial layer is the stratum corneum, composed basically of keratin. In it, amino acid molecules that form the Natural Moisturizing Factor (NMF) are found. MFN is a blend of 15 highly hygroscopic amino acids. Water is the only substance capable of providing elasticity to the stratum corneum, which is necessary for metabolic reactions to occur, resulting in cell renewal. The stratum corneum has the importance of retaining the water, preventing the skin from becoming dry and dehydrated.
- NMF Natural Moisturizing Factor
- emollient agents in formulations can be effective in preventing wrinkles and dry skin, in addition to providing better spreadability of the product.
- creams possess at least one emollient in their composition. They are given by vegetable oils, fatty acids (omega 6 and 3) and non-greasy lipids that spread easily on the skin, giving it a texture of softness and flexibility.
- Humectants are substances that contain water in their formulation and, when applied to the skin, create a protective layer, which protects the skin from losing water to the atmosphere, keeping it moist. These substances do not permeate the stratum corneum, they form a hydrophilic film on the skin, retaining water on the surface of the stratum corneum. Also they improve the consistency of the product, avoiding the crystallization of the same.
- Animal or vegetable protein hydrolysates are used as wetting agents in the creams. Among them are glycerin, D-panthenol, hyaluronic acid, oils and vegetable extracts. Vegetable oils are the best wetting agents because they replenish the skin's hydrophilic film by keeping water on the surface of the layer.
- Hyaluronic acid is a substance found in the skin and works by filling the spaces between the cells, leaving the skin looking smooth and well hydrated. The concentration of this acid decreases with age, being one of the reasons for the appearance of wrinkles and dryness.
- the addition of this compound in the creams helps in both hydration, since it retains water on the skin - one gram of acid can hold three grams of water - for smoothing wrinkles and aging marks.
- repellent ability various substances have traditionally been used to repel insects. These include smoke, plant extracts, oils, tar, and sludge. With the technological advancement of repellents, individual compounds were discovered and isolated. This has allowed the formulation of new and more efficient forms of repellents.
- repellent To be ideal, a repellent must be able to repel several species at the same time; have repellency efficacy for a specified period and proven by laboratory tests; be nontoxic; show little odor; resistant to abrasion and water; have favorable cosmetic characteristics and economic viability. In general, repellents act by forming a layer of vapor on the skin, interfering with the mosquito's target identification mechanisms and thus preventing stinging.
- insect repellent commonly associated with insect repellent, is a composition applied to the skin, clothing or other surfaces that discourages insects (and other arthropods in general) from landing on that surface. Insect repellents help prevent and control the outbreak of various vector-borne diseases such as malaria, Lyme disease, dengue fever, chikungunya, zika and West Nile fever.
- Catnip oil has as its main active ingredient nepetalactone, which has potential for repellent formulations.
- nepetalactone which has potential for repellent formulations.
- problems related to its use such as low availability of suppliers and national distributors and low repellent efficacy for Aedes aegypti, the main vector transmitting diseases such as Dengue, Zika and Chikungunya.
- DEET although widely used for decades and considered safe, shows toxicity related to its use, mainly due to its ability to penetrate the skin and the misuse of the product. In addition, DEET does not exhibit any interesting cosmetic properties since characteristic pungent odor and sticky appearance. Other limitations of DEET are related to the restricted percentage of the concentration that can be used according to sanitary legislation (ANVISA), which may result in the impossibility of increasing dosage of the active to achieve the desired repellent efficacy. The indication of use in children from 2 to 12 years old is up to 10% DEET, and above that concentration can not be used. There is also the incompatibility of DEET with plastic materials. The application of the asset in nanostructure would minimize such disadvantages.
- IR3535 (Insect Repelent 353) is a synthetic molecule derived from the amino acid ⁇ -alanine, which exhibits favorable cosmetic properties such as absence of odor and non-sticky appearance and can be conveyed in various types of formulation, including O / W emulsions or creams), gels, sprays and wipes.
- O / W emulsions or creams emulsions or creams
- gels emulsions or creams
- sprays and wipes e.g., to obtain better protection times the product should be used in the concentration of 10 to 30% and there are reports showing that solutions 20% of IR3535 have reduced effectiveness in repelling Dengue and Yellow fever carriers, precisely the diseases transmitted by Aedes aegypti.
- Picaridine also known as Icaridine, hydroxyethyl isobutyl piperidine carboxylate and KBR3023, is registered for use in the human body as a repellent of various arthropods, including ticks and mosquitoes. It is not considered to be an irritant or a skin sensitizer but may cause moderate eye irritation. It also has low absorption through the skin ( ⁇ 6%) and tends to be less oily, better tolerated and with less pungent odor when compared to other traditional repellent active.
- repellent systems use the aerosol system. They are made from a few different types of ingredients, including solvent, a propellant, and various ingredients.
- the solvent is usually an organic alcohol, useful for diluting the active ingredient to an appropriate concentration and keeping all the raw materials mixed, ensuring that the product will remain effective even after long-term storage.
- WO 2016/137006 discloses a cosmetic composition which carrier is comprised of polymeric micelles comprising a block copolymer having a hydrophilic and hydrophobic polymer chain, electrically charged surfactant and fatty acid, wherein such composition would be more compatible with non- lipophilic.
- the polymeric micelle of the present invention also provides stabilization of non-lipophilic actives, but using only the combination of the micelle with a thickening agent, simplifying the production process, dispensing with the use of complex ingredients and decreasing production costs.
- WO 2015/148483 describes two methods of continuously producing solid lipid nanoparticles: through the preparation of a pre-emulsion comprising a lipid and the continuous passage of the pre-emulsion through a high pressure homogenizer; or feeding a lipid composition through a hot melt extruder to prepare a preemulsion and continuously feeding the preemulsion through a high pressure homogenizer to form a composition of solid lipid nanoparticles.
- the solid lipid nanoparticles used in the present invention are produced by the condensation or low energy process in which the molecule of the surfactant has a spontaneous curvature favoring the water / oil emulsion formation. As the process that follows the behavior of the surfactant, requires fewer controls and complexities, also providing fewer process errors.
- Document BR 10 2014 0037209 describes a process of nanoencapsulation of actives by double emulsion: the actives are solubilized in water and then solubilized in solvent immiscible or slightly miscible with water in a saturated aqueous phase.
- the encapsulating material is added to the blend to effect the pre-emulsion, followed by final emulsification of the blend with silica oil.
- the nanoemulsification of the product is performed and then the nanorecupping process is done.
- the present invention uses three distinct means for the encapsulation of actives: polymeric micelles, nanoemulsions or solid lipid nanoparticles. Nanoemulsions, in turn, are made by ultrasound to improve polydispersity, decreasing the number of production steps.
- WO 2012/095543 describes a method of preparing polymer nanocapsules by mixing an aqueous solution containing a polymer and an organic solution containing an oil and a cationic surfactant under stirring.
- the polymeric component of the present invention and the polymeric micelles are produced using a thickening agent.
- EP 1738745 discloses a cosmetic base pharmaceutical composition in the form of a gel, ointment, cream or lotion, containing repellent emulsions, capable of promoting prolonged repellent action through the formation of water-in-oil (w / o) emulsions.
- the repellent active is trapped in the lipophilic outer phase and released uniformly over several hours.
- the size of the micelles formed there is no mention of the size of the micelles formed and whether the stability of the structure promoting prolonged release is the micelle itself or another support system, since the micelle of said document also contains low molecular weight diols / polyols , ethers, foam stabilizing polymers, electrolytes, thickeners and antioxidants.
- CN 102266270 and US664601 1 disclose cosmetic compositions based on cream containing repellent active.
- the proposed insect protection mechanism is different from the present invention: the repellent active is not continuously released; rather, the formulation retains the asset long enough to keep the action repellent.
- CN 102266270 proposes the formation of a repellent film in which the repellent active complexes with substances such as EDTA and cyclodextrin, while US 664601 1 proposes the formation of a surfactant system capable of retarding the degradation of the constituents of the formula Water. In both cases, the repellent action will lose effectiveness over time or contact with water or sweat.
- a nanometric system as in the present invention provides improved stability without the need for association with other substances, although such association increases the stability of the system as a whole.
- US 2012/189681 discloses extended release nanoparticles of volatile active agents as repellents where there is a nucleophilic core surrounded by a polymeric wall stabilized by surfactants. These nanoparticles begin the degradation process by photocatalysis, releasing the repellent active. The degradation process lasts for hours, which allows greater release of the asset.
- the polymeric micelles proposed do not require a light source for degradation, and may even be used in dark environments that are conducive to sleep.
- the present invention relates to a cosmetic formulation containing at least one nanometric system, a repellent active and / or cosmetic active for prolonged release.
- the present invention provides a nanometric system consisting of polymeric micelles.
- the present invention provides a nano-system consisting of nanoemulsions combined with surfactants.
- the present invention provides a nanometric system containing a combination of at least two nanometric systems.
- the present invention provides a nanometric system containing solid lipid nanoparticles.
- the present invention provides a nanometer system containing microparticles obtained by atomization via spray-drying.
- the present invention provides a nanometric system contained in a cosmetic formulation.
- the present invention provides a cosmetic formulation in the form of cream, lotion or liquid.
- the present disclosure is intended to provide a detailed description of the inventive concept, to provide examples that facilitate cognition / understanding thereof, and to provide accurate technical data on some of the embodiments of the inventive concept of the invention.
- the detailed description also aims to avoid the repetition by third parties of the extensive experimentation, financial investments, of time and of intellectual activity that the inventors / depositor did to solve the technical problems now solved.
- any feature described in one aspect of the present invention may be used in another aspect of the invention.
- the word “comprising” is intended to mean “including”, but not necessarily “consisting of” or “composed only of.” In other words, the steps or options listed do not have to be exhaustive. It is noted that the examples provided in the description below are intended to elucidate the invention, and should not per se be construed as limiting the scope of the invention.
- the present invention provides a cosmetic and / or repellent formulation, or a cosmetic or repellent, release-phase composition containing the active in one or more nanometric systems.
- the active principle is encapsulated in polymeric micelles, nanoemulsion with combined surfactants or solid lipid nanoparticles, for subsequent incorporation into a cosmetic base.
- a topical repellent and / or cosmetic composition characterized by comprising a cosmetic and / or repellent active contained in a sustained release nanometric system.
- composition according to claim 1 characterized in that said extended release nanometric system comprises: polymeric micelles; nanoemulsions; solid lipid nanoparticles or combinations thereof.
- composition according to clause 1 or 2 characterized in that the nanometric system consists of the combination of polymeric micelles in a nanoemulsion.
- composition according to clause 1 or 2 characterized in that the nano-system consists of nanoemulsions.
- composition according to clause 1 or 2 characterized in that the nanometric system consists of solid lipid nanoparticles.
- composition according to any one of the claims 1-5 characterized in that the cosmetic and / or repellent active is selected from: sunscreen; bacteriostatic / antiseptic; anti-oiliness; signer; antiodor; fragrances; natural oils with moisturizing function; Macadamia oil; Almond oil; Sunflower oil; Grape seed oil; Rosehip Oil; Vitamin E; Vitamin A; Vitamin C; Triclosan; Raffermine (Hydrolyzed Soy Flour); Catnip oil; DEET; IR 3535; citronella oil; citrodiol; Icaridine, or combinations thereof.
- sunscreen bacteriostatic / antiseptic
- anti-oiliness signer
- antiodor fragrances
- natural oils with moisturizing function Macadamia oil; Almond oil; Sunflower oil; Grape seed oil; Rosehip Oil
- Vitamin E Vitamin A
- Vitamin C Triclosan
- Raffermine Hydrolyzed Soy Flour
- Catnip oil DEET
- IR 3535 citron
- composition according to clause 2 or 3 characterized in that the polymeric micelles consist of a block copolymer (poloxamer).
- composition according to clause 2, 3 or 4 characterized in that the nanoemulsion consists of at least three surfactants.
- composition according to clause 2 or 5 characterized in that the lipid nanoparticles contain at least two lipid components selected from: octyl stearate, sesame oil, mineral oil, cetostearyl alcohol, castor oil and sorbitan ester .
- composition according to clause 2, 5 or 9 characterized in that the nanometric system consists of atomised lipid microparticles via spray-drying.
- composition according to clause 10 characterized in that the lipid microparticles contain at least one of the following components: stearic acid; carnauba wax; Compritol 888 ATO; Crodamol; octyl stearate; chitosan; eugenol; or combinations thereof.
- composition according to clause 14 characterized in that the topical cream contains at least one humectant, a solubilizer, a thickening agent, a film-forming agent, a softener, a neutralizer and deionized water, optionally containing a fragrance .
- Cosmetic actives can be listed based on the intended function, such as: sunscreen, bacteriostatic active seeking antiseptic effect for deodorants, anti-oil active or firm active for topical application, anti-odor active, as well as fragrances. All encapsulated by some of the nanostructures.
- Almond oil it has high content of oleic acid, which is one of the fatty acids found in higher concentrations in the glands of the skin. It has nutritional properties, emollients, softeners, healing, protective of the tissues, improving flexibility and elasticity of the skin also aiding in the treatments of stretch marks and wrinkles.
- Sunflower oil High content of oleic acids, natural alpha-tocopherols. Free anti-radical action.
- Grape Seed Oil It is indicated for all skin types, as it regenerates the skin tissue, revitalizing it.
- Rosehip Oil it has noble substances that activate and accelerate the proliferation of new cells, allowing accelerated renewal of the skin.
- Vitamin E has anti-free radicals and moisturizing action. It acts as a biological antioxidant protecting the skin from oxidation. Its cellular constituents inhibit the formation of lipid peroxides.
- Vitamin A It plays an important role in regulating the growth of epithelial cells and maintaining their integrity.
- Vitamin C Antioxidant active, which also acts on the cellular regeneration of the skin. All the antioxidant properties of vitamin C have greater effectiveness when it is nanoencapsulated, because it is an unstable substance.
- Plant extracts are promising sources of bioactive substances, but in their raw state may have antioxidant activity compromised because of their physicochemical instability.
- Triclosan (at most 0.3%) as a deodorant, which is capable of inhibiting the growth of bacteria on the skin, thus masks bad odor .
- the active antiperspirants are based on aluminum salts.
- the main active component of antiperspirants is aluminum hydrochloride, whose cations AI 3+ coagulate proteins.
- the mechanism of action of the antiperspirants is the diffusion of the salt by the sweat duct that after the slow neutralization of the acidic solution of metallic salt, produces a gel or mucopolysaccharide complex. This obstruction prevents sweat from escaping and remains until the affected keratin is replaced by the normal processes of cell renewal. Some people may experience irritation to components derived from aluminum.
- the hydrochloride of aluminum minimizes the drawbacks of aluminum chloride. Its solutions have a pH closer to that of the skin.
- Other options are buffered aluminum hydrochloride and zirconium complexes, which are more effective and less irritating than aluminum chloride.
- Activated aluminum and zirconium hydrochlorides are even more effective.
- Another currently used asset is AZG, which is obtained by the reaction of aluminum hydrochloride with zirconium chloride. This reaction, in the presence of the amino acid glycine leads to the ZAG complexes.
- Raffermine Hydrophilyzed Soy Flour
- the intent to encapsulate sunscreen assets is to prevent the permeation of the active FPS in the skin.
- Certain nanostructures are bioadhesive, which allows the product to remain on the surface of the skin without penetration, and consequently provides a longer duration of UVA / UVB protection.
- Another advantage is the possibility of reducing the amount of filters in the formula, while maintaining the same level of protection.
- the first part of the production process of the base formula corresponds to the development of one of the three nanometric compartments containing the active for addition in the cosmetic base.
- Preferred repellent actives in the invention are selected from: Catnip oil; DEET; IR 3535; citronella oil; citrodiol; Icaridina; or combinations thereof.
- concentrations used may vary, with the following being common: 10 to 15% Catnip Oil, 10 to 25% DEET, 10 to 25% IR 3535, 10 to 15% citronella oil, 10 to 10% Citrodiol or Icaridine 10 to 20%.
- the polymeric micelle consists of structures containing the active substance for further incorporation into the final long-term formulation.
- three types of encapsulating products useful in the present invention were found: block copolymer, carnauba and stearyl alcohol keto.
- Copolymers are commercially known as Pluronics, Synperonic and Polaxamers. They form micelles able to combine with the active and optimize solubility, stability, permeability, release control and protect the active.
- the micelle core is hydrophobic and the crown is hydrophilic.
- the aim of the use of the copolymer is to develop and characterize a dispersion of polymeric micelles containing the active and subsequent incorporation of adjuvants, which will allow to obtain a final formulation for efficacy test.
- the most stable polymeric micelle comprises the following thickeners in combination with the active: xanthan gum, poloxamer, carbomer, guar gum, carboxymethylcellulose and hydroxyethylcellulose.
- Xanthan gum is a polysaccharide produced through the fermentation of glucose, sucrose or lactose or further secreted by the bacterium Xanthomonas campestres. It is composed of repeated pentameric units comprising glucose, mannose and glucuronic acid in molar ratio of 2: 2: 1. Xanthan gum is useful in cosmetic formulations as rheology modifier and phase separation preventive.
- Poloxamer is an agent of consistency, emulsifier of oil in water, dispersant, humidifier and solubilizer for skin products. It is a water-soluble surface active agent and acts as a high HLB emulsifier.
- Carbomer is a water-soluble acrylic polymer used to stabilize emulsions and give viscosity to systems. It is used in the cosmetics industry to manufacture gel products.
- Guar gum is a type of polysaccharide that belongs to the class of soluble fibers. Viscous gel form when in contact with water, which adds to the viscosity of the final product. It is resistant to pH variation and chemically inert to oils and solvents.
- Carboxyethylcellulose is an anionic polymer derived from cellulose. It has great ability to form gels both cold and hot. It is biodegradable.
- Hydroxyethylcellulose is a nonionic ether obtained from the processing of cellulose. Soluble at room temperature is used as general purpose thickener.
- a second embodiment of the proposed formulation is a nanoemulsion.
- Nanoemulsions as well as conventional emulsions, are heterogeneous systems in which an immiscible liquid is dispersed in the form of droplets in another liquid. Such systems may be thermodynamically stabilized by the addition of a surfactant or mixture of surfactants. Invariably, one of the two immiscible liquids is water and the second is an oily substance.
- nanoemulsion is defined because it gives an idea of the size range of the globules in nanometers, is a concise term and avoids confusion with the microemulsions, which are thermodynamically stable systems.
- Such formulations have been used as active carriers of low aqueous solubility, such as various oily actives. They can also be used to promote the stabilization of compounds susceptible to hydrolysis, reduce irritation or toxicity, as well as potential for prolonged release forms and possible targeting of the assets for specific action.
- Polydispersity is a mathematical relationship that aims to define how uniform a polymer is, ie what is the ratio of different sizes of molecules or chains within a chosen polymer.
- An ideal polymer is monodisperse, and all chains are the same size. However, this is a situation of ideality.
- polydispersed polymers are used, with chains of different sizes, seeking a greater approximation of the monodispersion and, thus, avoiding greater variation of the properties of the chosen polymer.
- the polydispersity is calculated by the ratio of the weight average molar mass to the number average molar mass of a polymer, generating an estimate of the molar distribution of the medium and having no measurable unit of measure.
- a nanoemulsion system using surfactants combined with the active was developed.
- the system showed stability of size and polydispersity, besides absence of precipitate and separation of phases, after 21 days with Zetasizer apparatus, being stable in extreme stability tests.
- the system is formed after use of Ultraturrax apparatus and at least 10 minutes of ultrasound in order to improve the polydispersity of the nanoemulsion.
- nanoemulsion systems of the invention After various tests and stability periods one of the nanoemulsion systems of the invention has demonstrated excellent results and comprises the following components: active, caprylic / capric triglyceride, poloxamer, sorbitan stearate, glycerin, dimethicone copolymer, carbomer, crosspolymer alkyl acrylate, triethanolamine and BHT.
- Caprylic / capric triglyceride is a surfactant composed of medium chain triglycerides, consisting mainly of esters of caprylic and capric acids, with excellent alcohol solubility. These characteristics make this ingredient very important in pharmaceutical formulations like lotions and creams. It is considered toxicologically and dermatologically innocuous.
- Polaxamer is an emulsifying, non-ionic surfactant. It is a triblock copolymer composed of a central polypropylene glycol hydrophobic block flanked by two hydrophilic blocks of polyethylene glycol.
- Sorbitan stearate is a nonionic surfactant widely used in cosmetic bases to provide the desired hydrophilic-lipophilic balance (HLB).
- Glycerin also known as glycerol or propan-1,2,3-triol, is used as a wetting agent.
- glycerin also known as glycerol or propan-1,2,3-triol.
- the use of glycerin on creamy bases also improves polydispersity and decreases particle size.
- Dimethicone copolymer is a 60% nonionic emulsion composed of a high viscosity, high molecular weight divinyldimethicone / dimethicone copolymer. It facilitates the incorporation of polymers such as carbomer into aqueous based systems.
- Carbomer is a modified crosslinked acrylate copolymer. It is a self-wetting polymer and thickening agent, modifying the rheology of the formulation, having stabilizing and suspending ability. It is specially designed for emulsifying formulations.
- Alkyl acrylate crosspolymer is an emulsifying agent. It is a polymeric surfactant of polyacrylic acid.
- Triethanolamine is a strong base, a tertiary amine and a triol, containing three alcohol groups. It is very useful for pH adjustment but mainly used as an alkalizing agent.
- Example 3 Development of double system with polymeric micelles and nanoemulsion (NE) containing active:
- One embodiment of the formulation / system of the invention is to incorporate and enhance the action of cosmetic and repellent actives, to obtain an end product using the two active encapsulation systems mentioned above: the formation of polymeric micelles and the nanoemulsion.
- the formulation of this embodiment has the components set forth in Table 1.
- the preparation process consists in obtaining the polymeric micelle with part of the active and subsequent incorporation of the emulsifying agents. Obtaining cosmetic cream was improved with the use of glycerin and silicone. The addition of silicone at a concentration of 2% greatly improves the expected cosmetic touch.
- the size of the particles found in the final system is good, with sizes between 200 and 600 nanometers and polydispersity below 0.50.
- the solid lipid nanoparticle consisting of the mixture of solid and liquid lipids, is a promising system for active loading, with efficiency gains when compared to the free active formula, since mixing of the liquid lipid with the solid lipid leads to imperfections in the matrix, which allows the gradual release of the liquid lipid together with the active.
- compositions that had a good interaction with the active ingredients were selected as the liquid lipid agent. Besides the possibility of carrying the active, there was also concern about the cosmetic function of the lipid.
- the sesame oil has in its composition the vitamin E that acts as antioxidant possesses bactericidal and fungicidal action.
- Octyl Stearate is a branched chain emollient ester with excellent scattering, lubricity and residual properties on the skin and hair, offering a feeling of emollience and oil-free. Leaves skin with velvety softness and reduces oily touch in formulations with high oil content.
- Solid lipid nanoparticles can be produced by a variety of techniques. The research was developed through the process of condensation or low energy. This process uses the physicochemical properties of the system seeking a spontaneous emulsification, where the phase inversion occurs due to the specific property of the surfactants as a function of temperature or interaction with other chemical agents.
- the surfactant molecule has a spontaneous curvature favoring the water / oil emulsion formation. This inversion process creates tension at the system interface, which causes a reduction in size leading to nanostructures.
- solid lipid nanoparticles contain the formulation indicated in Table 2.
- the process is a fundamental point to obtain NLS.
- the use of thermal shock leads to particles with smaller diameter and less polydispersity.
- the addition of the aqueous phase to the oily phase significantly affects the mean diameter and polydispersity of the particles.
- the particles remained stable for 30 days, with some variation in size only when stored in a cold room. In other conditions, a greater variation occurs.
- Aedes aegypti - effectiveness up to the total time of 8 hours.
- the three systems - polymeric micelle, nanoemulsion and solid lipid nanoparticle - were incorporated in cream and showed efficacy for up to 16 hours.
- Example 6 Incorporation of the polymeric micelles in cream base to obtain the repellent product.
- Table 3 shows the composition of this embodiment of the invention, indicating percent weight ranges of each ingredient.
- Examples of sequestrants and antioxidants are disodium EDTA and BHT, respectively, which remove metals such as iron from the medium that catalyze lipid oxidation reactions.
- Example 7 Incorporation of the Nanoemulsion cream base to obtain the repellent product.
- Table 4 shows the composition of this embodiment of the invention, indicating percentages by weight of each ingredient.
- Example 8 Incorporation of the NLS - Solid Lipid Nanoparticle on cream base to obtain the repellent product.
- Table 5 shows the composition of this embodiment of the invention, including the active ingredient, indicating percentages by weight of each ingredient.
- disodium EDTA and BHT are used as the antioxidant and sequestering agent.
- Example 9 Preparation of atomized lipid microparticles via sprav-dryin containing active (% w / w).
- Tables 6-9 show examples of this embodiment of the invention, indicating percentages by weight of each ingredient.
- Example 10 Preparation of cream base for incorporation of a nanometric system.
- Table 10 shows the composition of the cream base used in the present example, indicating percentages by weight of each ingredient.
- the depositor in filing this patent application with the competent body / guarantor, seeks and intends: (i) to name the inventors in respect of their respective moral rights; (ii) indicate unequivocally that he is the owner of the industrial secret and holds any form of intellectual property deriving from it and the depositor wishes; (iii) to describe in detail the content object of the secret, proving its existence in the physical and legal planes; (iv) establishing the relationship between the examples / embodiments and the inventive concept according to the cognition of the depositor and its context, in order to clearly demonstrate the scope of its intangible good, protected and / or tutelage; (v) request and obtain the additional rights provided for patents, if the applicant elects to continue with the administrative procedure until the end.
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Cited By (7)
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EP3763212B1 (en) | 2019-07-11 | 2021-08-18 | SanderStrothmann GmbH | Arthropoda repellent composition |
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WO2021195246A1 (en) * | 2020-03-24 | 2021-09-30 | Texas Tech University System | Compositions and methods for repelling animals from an object |
WO2022024129A1 (en) * | 2020-07-29 | 2022-02-03 | Karnak Technologies, Llc | Improved formulations of lipophilic subtances for cosmetic uses |
CN115297818A (zh) * | 2020-07-29 | 2022-11-04 | 卡纳克科技有限责任公司 | 用于化妆品用途的亲脂性物质的改进的制剂 |
GR20220100673A (el) * | 2022-08-11 | 2024-03-12 | Εθνικο Ιδρυμα Ερευνων, | Συνθεση απωθητικου κουνουπιων που περιλαμβανει αιθεριο ελαιο αχιλλεας (αγραψιθιας, yarrow) |
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