CN115670967A - Lipophilic starch, method for producing the same, and cosmetic composition containing the same - Google Patents
Lipophilic starch, method for producing the same, and cosmetic composition containing the same Download PDFInfo
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- CN115670967A CN115670967A CN202210649483.2A CN202210649483A CN115670967A CN 115670967 A CN115670967 A CN 115670967A CN 202210649483 A CN202210649483 A CN 202210649483A CN 115670967 A CN115670967 A CN 115670967A
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- lipophilic starch
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- 229920002472 Starch Polymers 0.000 title claims abstract description 222
- 235000019698 starch Nutrition 0.000 title claims abstract description 203
- 239000008107 starch Substances 0.000 title claims abstract description 198
- 239000002537 cosmetic Substances 0.000 title claims abstract description 34
- 239000000203 mixture Substances 0.000 title claims abstract description 26
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 74
- 239000002245 particle Substances 0.000 claims abstract description 57
- 239000006185 dispersion Substances 0.000 claims abstract description 53
- 239000011247 coating layer Substances 0.000 claims abstract description 28
- 239000011159 matrix material Substances 0.000 claims abstract description 16
- 235000014593 oils and fats Nutrition 0.000 claims abstract description 13
- 239000003921 oil Substances 0.000 claims description 65
- 238000005507 spraying Methods 0.000 claims description 29
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- 238000000576 coating method Methods 0.000 claims description 22
- 239000011248 coating agent Substances 0.000 claims description 21
- 239000008187 granular material Substances 0.000 claims description 21
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- 125000004432 carbon atom Chemical group C* 0.000 claims 1
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- 230000000844 anti-bacterial effect Effects 0.000 abstract description 23
- 238000000034 method Methods 0.000 abstract description 9
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- 238000011156 evaluation Methods 0.000 description 14
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- RZRNAYUHWVFMIP-KTKRTIGZSA-N 1-oleoylglycerol Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OCC(O)CO RZRNAYUHWVFMIP-KTKRTIGZSA-N 0.000 description 1
- HFWHTGSLDKKCMD-UHFFFAOYSA-N 2,2-bis(octanoyloxymethyl)butyl octanoate Chemical compound CCCCCCCC(=O)OCC(CC)(COC(=O)CCCCCCC)COC(=O)CCCCCCC HFWHTGSLDKKCMD-UHFFFAOYSA-N 0.000 description 1
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- PUGOMSLRUSTQGV-UHFFFAOYSA-N 2,3-di(prop-2-enoyloxy)propyl prop-2-enoate Chemical compound C=CC(=O)OCC(OC(=O)C=C)COC(=O)C=C PUGOMSLRUSTQGV-UHFFFAOYSA-N 0.000 description 1
- XFOQWQKDSMIPHT-UHFFFAOYSA-N 2,3-dichloro-6-(trifluoromethyl)pyridine Chemical compound FC(F)(F)C1=CC=C(Cl)C(Cl)=N1 XFOQWQKDSMIPHT-UHFFFAOYSA-N 0.000 description 1
- JAFZDVXJYZJAAF-UHFFFAOYSA-N 2-(2-decanoyloxyethoxy)ethyl decanoate Chemical compound CCCCCCCCCC(=O)OCCOCCOC(=O)CCCCCCCCC JAFZDVXJYZJAAF-UHFFFAOYSA-N 0.000 description 1
- FZGBADVTTLOFPU-UHFFFAOYSA-N 2-(2-dodecanoyloxyethoxy)ethyl dodecanoate Chemical compound CCCCCCCCCCCC(=O)OCCOCCOC(=O)CCCCCCCCCCC FZGBADVTTLOFPU-UHFFFAOYSA-N 0.000 description 1
- FKOKUHFZNIUSLW-UHFFFAOYSA-N 2-Hydroxypropyl stearate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCC(C)O FKOKUHFZNIUSLW-UHFFFAOYSA-N 0.000 description 1
- LCZVSXRMYJUNFX-UHFFFAOYSA-N 2-[2-(2-hydroxypropoxy)propoxy]propan-1-ol Chemical compound CC(O)COC(C)COC(C)CO LCZVSXRMYJUNFX-UHFFFAOYSA-N 0.000 description 1
- MUHFRORXWCGZGE-KTKRTIGZSA-N 2-hydroxyethyl (z)-octadec-9-enoate Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OCCO MUHFRORXWCGZGE-KTKRTIGZSA-N 0.000 description 1
- BXCRLBBIZJSWNS-UHFFFAOYSA-N 2-hydroxyethyl hexadecanoate Chemical compound CCCCCCCCCCCCCCCC(=O)OCCO BXCRLBBIZJSWNS-UHFFFAOYSA-N 0.000 description 1
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- MRXUUQQDQMYXNG-UHFFFAOYSA-N 2-hydroxypropanoic acid;propane-1,2-diol Chemical compound CC(O)CO.CC(O)C(O)=O MRXUUQQDQMYXNG-UHFFFAOYSA-N 0.000 description 1
- BJRXGOFKVBOFCO-UHFFFAOYSA-N 2-hydroxypropyl 16-methylheptadecanoate Chemical compound CC(C)CCCCCCCCCCCCCCC(=O)OCC(C)O BJRXGOFKVBOFCO-UHFFFAOYSA-N 0.000 description 1
- HTNFLUQQANUSLR-UHFFFAOYSA-N 2-octanoyloxyethyl octanoate Chemical compound CCCCCCCC(=O)OCCOC(=O)CCCCCCC HTNFLUQQANUSLR-UHFFFAOYSA-N 0.000 description 1
- ZIIVEKCKOPDBLT-UHFFFAOYSA-N 2-octyldodecyl 2-hydroxypropanoate Chemical compound CCCCCCCCCCC(COC(=O)C(C)O)CCCCCCCC ZIIVEKCKOPDBLT-UHFFFAOYSA-N 0.000 description 1
- ZZZCUOFIHGPKAK-UHFFFAOYSA-N D-erythro-ascorbic acid Natural products OCC1OC(=O)C(O)=C1O ZZZCUOFIHGPKAK-UHFFFAOYSA-N 0.000 description 1
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- YBGZDTIWKVFICR-JLHYYAGUSA-N Octyl 4-methoxycinnamic acid Chemical compound CCCCC(CC)COC(=O)\C=C\C1=CC=C(OC)C=C1 YBGZDTIWKVFICR-JLHYYAGUSA-N 0.000 description 1
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- BHEOSNUKNHRBNM-UHFFFAOYSA-N Tetramethylsqualene Natural products CC(=C)C(C)CCC(=C)C(C)CCC(C)=CCCC=C(C)CCC(C)C(=C)CCC(C)C(C)=C BHEOSNUKNHRBNM-UHFFFAOYSA-N 0.000 description 1
- 229930003268 Vitamin C Natural products 0.000 description 1
- DRRMRHKHTQRWMB-UHFFFAOYSA-N [3-(2-ethylhexanoyloxy)-2,2-bis(2-ethylhexanoyloxymethyl)propyl] 2-ethylhexanoate Chemical compound CCCCC(CC)C(=O)OCC(COC(=O)C(CC)CCCC)(COC(=O)C(CC)CCCC)COC(=O)C(CC)CCCC DRRMRHKHTQRWMB-UHFFFAOYSA-N 0.000 description 1
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- WMNULTDOANGXRT-UHFFFAOYSA-N bis(2-ethylhexyl) butanedioate Chemical compound CCCCC(CC)COC(=O)CCC(=O)OCC(CC)CCCC WMNULTDOANGXRT-UHFFFAOYSA-N 0.000 description 1
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- VJHINFRRDQUWOJ-UHFFFAOYSA-N dioctyl sebacate Chemical compound CCCCC(CC)COC(=O)CCCCCCCCC(=O)OCC(CC)CCCC VJHINFRRDQUWOJ-UHFFFAOYSA-N 0.000 description 1
- XFKBBSZEQRFVSL-UHFFFAOYSA-N dipropan-2-yl decanedioate Chemical compound CC(C)OC(=O)CCCCCCCCC(=O)OC(C)C XFKBBSZEQRFVSL-UHFFFAOYSA-N 0.000 description 1
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- 239000002609 medium Substances 0.000 description 1
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- JXTPJDDICSTXJX-UHFFFAOYSA-N n-Triacontane Natural products CCCCCCCCCCCCCCCCCCCCCCCCCCCCCC JXTPJDDICSTXJX-UHFFFAOYSA-N 0.000 description 1
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- KSCKTBJJRVPGKM-UHFFFAOYSA-N octan-1-olate;titanium(4+) Chemical compound [Ti+4].CCCCCCCC[O-].CCCCCCCC[O-].CCCCCCCC[O-].CCCCCCCC[O-] KSCKTBJJRVPGKM-UHFFFAOYSA-N 0.000 description 1
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Abstract
The present invention relates to a lipophilic starch, a method for preparing the same, and a cosmetic composition containing the lipophilic starch. In this production method, a dispersion solution containing a specific amount of ethanol, higher alcohols and oils and fats is coated with plant starch particles at a specific weight ratio to produce a lipophilic starch having a lipophilic coating layer on the surface. The prepared lipophilic starch has antibacterial property and good dispersibility in cosmetic matrix. Cosmetic compositions containing lipophilic starch provide skin-friendly smoothness and freshness.
Description
Technical Field
The present invention relates to a lipophilic starch, a method for preparing the same, and a cosmetic composition containing the same, and more particularly, to a lipophilic starch which is physically coated and has good dispersibility, a method for preparing the same, and a cosmetic composition containing the same.
Background
Generally, cosmetics (such as foundations, mascaras, eye shadows, and blushes) are prepared by mixing starch, moisture-retaining molecules (such as gelatin, algin, higher alcohols, or polysaccharides), other functional ingredients (such as vitamin C or plant extracts), and pigments. The starch can improve the durability, brightness, moisture retention or blemish coverage of the cosmetic on the skin.
Powders which are generally used in cosmetics may be, for example, organic and inorganic powders, where organic powders are used
The starch may, for example, be corn starch, rice starch or cellulose derivatives, while the inorganic powder is, for example, silicon dioxide or titanium dioxide. However, the above starches are inferior in lipophilicity, reducing their dispersibility in cosmetics. Secondly, starch itself is liable to grow bacteria, which reduces the stability of the cosmetic. In addition, starch is apt to absorb sweat and oil secreted from the skin to cause aggregation or shedding from the skin, thus being not favorable for the skin of a human body to be attached.
In view of the above problems, the prior art provides a complex modification method to increase the lipophilicity and antibacterial property of starch. For example, the complex modification method may use a cross-linking agent to form a chemical bond between starch and lipophilic higher alcohols, acids or antibacterial molecules; or further optionally adding oil (such as long-chain fatty acids, esters or polyols) to improve starch dispersibility.
The starch prepared by the composite modification method is easily affected by acid, alkali or illumination, and chemical substances which can stimulate the skin are liberated. In addition, the dispersibility of the composite modified starch in the cosmetic matrix is poor, and the market requirements are difficult to meet. For example, the cosmetic composition containing the composite modified starch is easy to generate precipitates and even generate the problem of uneven color blocks after being stood for a long time. Furthermore, a crosslinking agent or an oil agent added for improving poor dispersibility also increases the greasy feeling of the cosmetic.
In view of the above, it is desirable to develop a novel starch and a method for producing the same, which can overcome the above-mentioned disadvantages of the conventional starch.
Disclosure of Invention
In view of the above problems, one embodiment of the present invention provides a method for producing a lipophilic starch, in which a dispersion solution containing a specific amount of ethanol, a higher alcohol and an oil or fat is used to coat plant starch particles in a specific weight ratio, thereby producing a lipophilic starch having a lipophilic coating layer on the surface. The prepared lipophilic starch has antibacterial property and good dispersibility in cosmetic matrix, and the cosmetic composition containing the lipophilic starch can provide smooth and refreshing feeling.
Another embodiment of the present invention provides a lipophilic starch. The lipophilic starch is prepared by the method for preparing the lipophilic starch.
In another embodiment of the present invention, a lipophilic starch is provided. The lipophilic starch comprises plant starch particles and a lipophilic coating layer positioned on the surface of the plant starch particles, wherein the plant starch particles and the lipophilic coating layer are in direct contact and have no covalent bonds.
In another embodiment of the present invention, a cosmetic composition is provided. The cosmetic composition comprises a base and the lipophilic starch, wherein the lipophilic starch is uniformly dispersed in the base.
According to one embodiment of the present invention, a method for producing a lipophilic starch is provided. In the production method, a dispersion solution containing ethanol, a higher alcohol and an oil or fat is provided, wherein the amount of the higher alcohol is 0.5 to 1.5 parts by weight and the amount of the oil or fat is 1 to 10 parts by weight based on 100 parts by weight of ethanol. Then, the vegetable starch granules are subjected to a spray coating step, wherein the spray coating step is to spray a dispersion solution to the vegetable starch granules in an air flow to obtain the lipophilic starch. The weight ratio of the plant starch particles to the dispersion solution is 1:0.8 to 1:1.2, the lipophilic starch has a lipophilic coating, and the lipophilic coating is substantially free of ethanol.
According to one embodiment of the present invention, the higher alcohols comprise saturated or unsaturated monohydric alcohols having a carbon number of 12 to 25.
According to another embodiment of the invention the solubility of the fats and oils in ethanol is between 0.005g/g and 0.1g/g at between 22 ℃ and 28 ℃.
According to still another embodiment of the present invention, the weight ratio of the higher alcohols to the fats and oils is not less than 0.1 and less than 0.4.
According to still another embodiment of the present invention, the dispersion solution is an oil-in-alcohol dispersion.
According to a further embodiment of the invention, the spray coating step is carried out for 5 minutes to 4 hours.
Another embodiment of the present invention provides a lipophilic starch. The lipophilic starch is obtained by the above-mentioned method for producing a lipophilic starch.
In another embodiment of the present invention, a lipophilic starch is provided. The lipophilic starch comprises plant starch particles and a lipophilic coating layer positioned on the surface of the plant starch particles, wherein the plant starch particles and the lipophilic coating layer are in direct contact and have no covalent bond.
According to one embodiment of the invention, the particle size of the lipophilic starch is 8 μm to 100 μm.
In another embodiment of the present invention, a cosmetic composition is provided. The cosmetic composition comprises a base and the lipophilic starch, wherein the base comprises a powdery base, an oily base or an emulsified base, and the lipophilic starch is uniformly dispersed in the base.
In summary, the present invention provides a method for producing a lipophilic starch, in which a dispersion solution containing a specific amount of ethanol, a higher alcohol and an oil or fat is coated with plant starch particles at a specific weight ratio to produce a lipophilic starch having a lipophilic coating layer on the surface. The prepared lipophilic starch has antibacterial property and good dispersibility in cosmetic matrix. Further, the cosmetic composition containing lipophilic starch provides smooth feeling and refreshing feeling to the skin.
Drawings
For a more complete understanding of the present embodiments and advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings. It must be emphasized that the various features are not drawn to scale and are for illustrative purposes only. The content of the related drawings is as follows:
fig. 1 is a flow chart showing a method for manufacturing lipophilic starch according to an embodiment of the present invention.
Reference numerals:
100: method of producing a composite material
110. 120: operation of
Detailed Description
The making and using of embodiments of the present invention are discussed in detail below. It should be appreciated, however, that the embodiments provide many applicable inventive concepts that can be embodied in a wide variety of specific contexts. The specific embodiments discussed are merely illustrative and do not limit the scope of the invention.
The method for producing a lipophilic starch of the present invention produces a lipophilic starch having a lipophilic coating layer on the surface thereof by using a dispersion solution containing a specific amount of ethanol, higher alcohols and oils and fats and a specific weight ratio of the dispersion solution to vegetable starch particles. The lipophilic starch has antibacterial effect and good dispersibility in cosmetic matrix. In addition, the cosmetic composition containing the lipophilic starch can provide smooth and refreshing feeling.
Specifically, in the manufacturing method, an air flow is applied to the plant starch particles to make the plant starch particles in a disturbed state by the air flow, then a dispersion solution is sprayed on the disturbed plant starch particles, after the dispersion solution is contacted with the plant starch particles, the higher alcohols and the oils and fats in the dispersion solution are physically adsorbed on the surfaces of the plant starch particles, and the air flow removes the solvent (i.e. ethanol) in the dispersion solution, so that the higher alcohols and the oils and fats are left on the surfaces of the plant starch particles and form a coating layer. Because higher alcohols and oils are lipophilic substances, the coating layer formed by the higher alcohols and oils is also lipophilic. Accordingly, the method for producing lipophilic starch of the present invention can change the hydrophilicity of starch from lipophilicity only by using a physical method, so that the method for producing lipophilic starch does not need to use a chemical reagent, and the lipophilicity of the produced starch is prevented from being improved by a chemical reaction (e.g., a cross-linking reaction or a chemical modification).
The term "dispersibility" as used herein refers to the tests for the dispersibility of a nonpolar oil (i.e., isohexadecane), the dispersibility of a polar oil (i.e., medium-chain triglyceride), the stability of a water-in-oil emulsion, and the uniformity of a lipophilic powder in a lipophilic starch, and the dispersibility of a lipophilic starch was evaluated based on the results of these tests.
The term "antibacterial property" as used herein means that the antibacterial property of the lipophilic starch is determined by detecting the bacteria content of the lipophilic starch and determining that the lipophilic starch has antibacterial property when the bacteria content is less than 100cfu/mL.
The "skin-friendly smoothness" referred to in the present invention is an evaluation performed by applying a lipophilic starch to human skin and then directly judging the ease of application and the close-fitting condition of the lipophilic starch to the skin by sensory evaluation. The "fresh feeling" referred to in the present invention is an evaluation of the fresh or greasy feeling of the lipophilic starch directly judged by the sensory evaluation after the lipophilic starch is applied to the human skin.
Referring to fig. 1, a flow chart of a method for producing lipophilic starch according to an embodiment of the present invention is shown. In the method 100 for producing lipophilic starch, a dispersion solution containing ethanol, higher alcohols, and oils and fats is provided as shown in operation 110.
In some embodiments, the solvent of the dispersion solution may be ethanol at a concentration of no less than 90 weight percent, and the solvent of the dispersion solution may include water at a concentration of no greater than 10 weight percent. When the composition and concentration of the solvent of the dispersion solution are the same as those described above, the risk of burning ethanol can be reduced to improve the safety of the spraying operation, and the solvent of the dispersion solution can be easily removed by the air flow to facilitate the production of the lipophilic starch.
The other components of the dispersion solution are not particularly limited, but are intended to achieve immediate coating as described later in the present invention, i.e., to be uniformly dispersed in the dispersion solution and to be removed by a gas flow at a coating temperature (i.e., 4 ℃ to 50 ℃). The term "uniformly dispersed in a dispersion solution" as used herein means that when the dispersion solution is continuously stirred at a rotation speed of not less than 50rpm at a temperature of 22 to 28 ℃, the appearance of the dispersion solution is not delaminated or settled, that is, the solute in the dispersion solution can be uniformly dispersed in the solvent.
The invention uses spray coating to prepare the lipophilic starch, so that the higher alcohols and the grease in the dispersion solution can be uniformly dispersed in the solvent for subsequent spraying, thereby avoiding the variation of the spraying amount of the higher alcohols, the grease and the ethanol caused by layering (or sedimentation) and further influencing the coating condition of the higher alcohols and the grease on the surface of the starch granules.
Specifically, higher alcohols are miscible or immiscible with oils and fats. In some embodiments, the higher alcohols and the oils may be miscible, so the lipophilic coating formed by the two may be a uniform structure, i.e., the alcohols and the oils exhibit a uniformly dispersed structure. In other embodiments, the higher alcohols and the fats and oils may be immiscible, so the coating may be a bilayer structure, and since the starch is hydrophilic, it is more easily physically adsorbed to the surface of the starch granule to form a layer closer to the surface of the starch granule than the hydrophilic one, and conversely, it is more lipophilic to form a layer farther from the surface of the starch granule.
In some embodiments, the dispersion solution is continuously stirred at a rotation speed of not less than 50rpm at 22 to 28 ℃ to uniformly disperse the higher alcohols and the fats and oils in the solvent. In some embodiments, the composition of the dispersion excludes surfactants, as surfactants (e.g., emulsifiers) can interfere with the coating of the starch particles with higher alcohols and fats. In other embodiments, the composition of the dispersion excludes salts because salts (e.g., sodium salts) form salt particles that cannot be removed by the gas stream and affect higher alcohols and fats coating the starch particles.
In some embodiments, the higher alcohols may comprise branched or straight chain saturated or unsaturated monohydric alcohols having a carbon number of 12 to 25, and preferably may be straight chain monohydric alcohols having a carbon number of 15 to 20. The carbon number of higher alcohols affects the effect of physical adsorption of alcohols on the surface of plant starch granules and the lipophilicity. When the carbon number of the higher alcohol is within the above range, the higher alcohol has lipophilicity and can be physically adsorbed on the surface of the plant starch particles, thereby increasing the lipophilicity of the lipophilic starch.
In some embodiments, the lipid has a solubility for ethanol of 0.005g/g to 0.1g/g at 22 ℃ to 28 ℃. When the solubility of the fats and oils is within the foregoing range, the fats and oils themselves may be uniformly dispersed in the dispersion solution, or may be uniformly dispersed in the dispersion solution at 22 ℃ to 28 ℃ with continuous stirring at a rotation speed of not less than 50 rpm. When the oil and fat are uniformly dispersed in the dispersion solution, spraying is facilitated, so that the lipophilicity of the prepared starch is increased. In some embodiments, the fats and oils may include jojoba oil, cetyl Ethylhexanoate (CEH), medium-chain triglycerides (MCT), and Isohexadecane (IDH).
In some embodiments, the higher alcohols are used in an amount of 0.5 to 1.5 parts by weight, and the fats and oils are used in an amount of 1 to 10 parts by weight, based on 100 parts by weight of ethanol. When the amount of ethanol, higher alcohols and oils and fats used is not within the above range, the coating layer formed by the higher alcohols and oils and fats may not have a sufficient thickness to render the starch granules lipophilic. If the amount of ethanol is too large, it may remain, thereby making the structure of the coating layer unstable. If the amount of the oil or fat is too large, the obtained lipophilic starch particles tend to aggregate, and the particle size of the lipophilic starch particles may be uneven or too large.
In some embodiments, the higher alcohol is used in an amount of 0.1 to 20 parts by weight, and preferably 0.5 to 5.0 parts by weight, based on 100 parts by weight of the dispersion solution. When the amount of the higher alcohol is within the above range, the amount of the alcohol is sufficient to form a coating layer, and the alcohol can be uniformly dispersed in the dispersion solution to facilitate spraying, so that the lipophilicity of the prepared starch is improved.
In some embodiments, the fats and oils are used in an amount of 0.1 to 10.0 parts by weight, and preferably 1.0 to 8.0 parts by weight, based on 100 parts by weight of the dispersion solution. When the amount of the oil and fat is within the above range, the amount of the oil and fat is enough to form a coating layer, and the oil and fat can be uniformly dispersed in the dispersion solution to facilitate spraying, so that the lipophilicity of the prepared starch is improved.
In some embodiments, the weight ratio of the higher alcohols to the fats and oils is not less than 0.1 and less than 0.4, and preferably may be 0.2 to 0.3. When the weight ratio of the higher alcohols to the oils is in the above range, the higher alcohols and the oils can be physically adsorbed on the surface of the starch granules, so that the stability of the structure of the formed coating layer is improved, and the lipophilicity of the prepared starch is improved.
Referring again to fig. 1, after operation 110, the vegetable starch granules are subjected to a spray coating step, as shown in operation 120. This spray coating step sprays the dispersion solution in a gas stream onto the vegetable starch particles to obtain the lipophilic starch. In some embodiments, the gas flow may be generated by a gas pump applying an inert gas. Specific examples of the inert gas include, but are not limited to, nitrogen and argon. When the particles of the animal and vegetable starch are disturbed by the airflow, the particles are in a dynamic state (such as a rotating and/or moving state) in space, so that the particles are not aggregated when the dispersion solution is sprayed to the particles, and the solvent (ethanol) in the dispersion solution can be immediately removed by the airflow, thereby being beneficial to controlling the particle size of the lipophilic starch.
In some embodiments, the vegetable starch may include, but is not limited to, corn starch, rice starch, and tapioca starch. If other starches (i.e., non-vegetable starches, such as synthetic or chemically modified starches) are used for spray coating, the lipophilic starch obtained cannot combine good antibacterial properties, dispersibility in a matrix of a cosmetic composition, and skin-friendly smoothness and refreshing feeling on human skin.
Specifically, the lipophilicity of starch is reduced because the removal of ethanol and/or the formation of a coating may be affected by the functional groups of the chemical structure of the starch, which is synthesized or chemically modified. For example, the functional groups of the chemical structure may be carboxylic acids and amine groups, which may react with ethanol, higher alcohols and oils, or other functional groups may affect the adsorption behavior of ethanol, higher alcohols and oils to the surface of the starch granule.
In some embodiments, the average particle size of the vegetable starch is from 8 μm to 100 μm, and preferably may be from 10 μm to 20 μm. When the average particle diameter of the plant starch is within the above range, lipophilic starch satisfying a specific particle diameter described later can be advantageously produced, and the skin-friendly smoothness of the lipophilic starch is improved.
In some embodiments, the specific surface area of the vegetable starch may be 50m 2 G to 500m 2 A/g, and preferably may be 100m 2 G to 300m 2 (ii) in terms of/g. When the specific surface area of the vegetable starch is out of the above range, the physical adsorption effect of the vegetable starch to higher alcohols and/or oils is poor, and it is difficult to form a coating layer, so that the lipophilicity of the starch produced is reduced.
In some embodiments, the manner of spraying the dispersion solution onto the surface of the particles may be a single pass or batch spray. The spraying frequency can be matched with the spraying amount to prepare the lipophilic starch meeting the specific particle size, so that the skin smoothness of the lipophilic starch is improved.
In some embodiments, the temperature of the spray coating step is 4 ℃ to 50 ℃, and preferably may be 30 ℃ to 45 ℃. When the temperature of the spraying coating step is in the range, the temperature range is favorable for immediately removing the ethanol to form a coating layer, and the particle size and the uniformity of the particles of the lipophilic starch are easily controlled, so that the lipophilicity of the prepared starch and the skin-friendly smoothness of the human skin are improved.
In some embodiments, the spray coating step is performed for 5 minutes to 4 hours, and preferably may be performed for 30 minutes to 2 hours. When the time of the spraying coating step is within the above range, sufficient time can be provided to spray sufficient amount of the oils and fats and higher alcohols on the surface of the particles to facilitate the formation of the coating layer, thereby improving the lipophilicity of the starch produced.
In some embodiments, the spray rate of the spray coating step (i.e., the spray rate of the dispersion solution) may be from 2g/min to 100g/min. When the spraying rate of the spraying coating step is in the range, enough grease and higher alcohols can be sprayed on the surface of the particles within the time of the spraying coating step, so that the coating layer is favorably formed, and the lipophilicity of the prepared starch is improved.
Another embodiment of the present invention provides a lipophilic starch. The lipophilic starch is prepared by the method for preparing the lipophilic starch. The prepared lipophilic starch comprises plant starch particles and a lipophilic coating layer positioned on the surface of the plant starch particles, wherein the plant starch particles are in direct contact with the lipophilic coating layer and do not have covalent bonds. The vegetable starch granules and the coating method are as described above, and thus are not described herein again.
The lipophilic coating layer of the lipophilic starch can prevent bacteria from attaching to the surface of the lipophilic starch granules, so that the lipophilic starch is endowed with antibacterial property. In addition, the lipophilic coating layer can also make the starch granules be thinly and flatly coated on the human skin, thereby increasing the skin-friendly smooth feeling and the refreshing feeling of the starch granules on the human skin.
In some embodiments, the particle size of the lipophilic starch may be 8 μm to 100 μm, and preferably may be 10 μm to 50 μm. When the particle size of the lipophilic starch is within the above range, the lipophilic starch can be uniformly coated on the skin to form a film on the skin, thereby improving the skin-friendly smoothness of the lipophilic starch.
Another embodiment of the present invention provides a cosmetic composition. The cosmetic composition comprises the lipophilic starch and a matrix, wherein the lipophilic starch is uniformly dispersed in the matrix. In particular, the matrix may comprise a powdered matrix, an oily matrix or an emulsified matrix.
In some embodiments, the powdered matrix may comprise a powder, such as: organic powders or inorganic powders. Specific examples of the powdery base may include, but are not limited to, honey powder. In other embodiments, the oily base may comprise a polar oil and a non-polar oil. In still other embodiments, the emulsifying base may comprise an oil-in-water emulsifying base and a water-in-oil emulsifying base.
In some embodiments, the polar oil may comprise glycerol triacrylate, propylene glycol isostearate, diethylhexyl sebacate, 2-ethylhexyl p-methoxycinnamate, trimethylpropane tri-2-ethylhexanoate, di-2-ethylhexyl succinate, propylene glycol di (caprylic capric acid), 2-ethylhexyl 2-cyano-3, 3-diphenylacrylate, glycerol tri (caprylic capric acid), trimethylolpropane trioctanoate, glycerol trioctanoate, ethylene glycol dioctanoate, glycerol dimyristate, diethylene glycol dilaurate, pentaerythritol tetra-2-ethylhexanoate, glycerol tri-2-ethylhexanoate, glycerol monostearate diacetate, octyl dodecyl lactate, propylene glycol monostearate, propylene glycol oleate, propylene glycol lactate, propylene glycol dihexanoate, diisopropyl sebacate, ethylene glycol monostearate, diethylene glycol didecanoate, glycerol dicoconate, glycerol dilaurate, glycerol sesquioleate, ethylene glycol monooleate, cocool, lauryl alcohol, cetyl lactate, diethyl sebacate, methyl fatty acid ester, ethylene glycol palmitate, polyethylene glycol tripropylene glycol (di-trimethyl acetate), and combinations thereof.
In some embodiments, the non-polar oil can comprise isohexadecane, silicone oil, mineral oil, petrolatum, squalene, squalane, other oils having a dielectric constant less than 15, and combinations thereof.
In some embodiments, the oil-in-water emulsified base may comprise an oil-in-water emulsion, a lotion, or a cream. In other embodiments, the water-in-oil emulsifying base may comprise a water-in-oil emulsion or cream.
In some embodiments, the cosmetic composition may optionally include additives to coordinate the application of the cosmetic composition. The kind and amount of the additive are not particularly limited, and may be those conventionally used by those skilled in the art of the present invention, but are preferably used in combination with cosmetic compositions.
The following examples are included to illustrate the invention and are not to be construed as limiting the invention, as those skilled in the art will appreciate that various modifications and variations may be made without departing from the spirit and scope of the invention.
Preparation of lipophilic starch
Example 1
The lipophilic starch of example 1 was prepared by dissolving 1 part by weight of 1-hexadecanol and 5 parts by weight of jojoba oil in 100 parts by weight of 95% ethanol (containing 5% water). After uniformly mixing with stirring at a rotation speed of 100rpm at 25 ℃ using a stirrer (manufactured by IKA corporation, model No. Rw 28 Basic), the resulting dispersion solution was continuously stirred while slowly spraying the dispersion solution from top to bottom via a feed motor to 100 parts by weight of rice starch particles (average particle diameter of 10 to 20 μm, and specific surface area of 100 m) 2 G to 300m 2 Per g), wherein the rice starch granules are contained in a vessel equipped with a hot air stirring device (manufactured by Yuchen machinery, and having model number YC-FBDD-2 BG), and the hot air is heated nitrogen gas, the temperature of which is maintained at 30 ℃ to 45 ℃. The coating was applied by one-shot spraying at a rate of 50g/min over a period of 50 minutes. The rice starch granules were stirred by hot air to assume a state of tumbling or rolling so that the vegetable starch granules were immediately coated with 1-hexadecanol and jojoba oil to form a lipophilic coating layer, thereby producing the lipophilic starch of example 1, and the specific conditions and evaluation results thereof are shown in table 1.
Examples 2 to 6 and comparative examples 1 to 7
Examples 2 to 6 and comparative examples 1 to 7 were all prepared in the same manner as in example 1. Except that the kinds and amounts of vegetable starch, higher alcohols and oils and fats were changed in examples 2 to 6 and comparative examples 1 to 7, and the concrete conditions and the evaluation results thereof are shown in Table 1.
Evaluation method
1. Dispersibility in water
Dispersibility is measured on the lipophilic starch in the bases of apolar oils, polar oils, water-in-oil creams and pressed powders, respectively, and the dispersibility of the lipophilic starch is evaluated as the dispersion or aggregation of the latter in these bases.
1-1. Dispersion of nonpolar oil
The term "non-polar oil-dispersible" as used herein refers to a dispersion of lipophilic starch in isohexadecane. The test for the dispersibility of the nonpolar oil is carried out by mixing the components in a test tube in a weight ratio of 1:20, the lipophilic starch and isohexadecane were uniformly mixed and then left to stand, and the time for the lipophilic starch to precipitate to the bottom of the test tube was observed, and the evaluation criteria thereof are as follows, wherein the longer the time for the lipophilic starch to precipitate to the bottom of the test tube, the better the dispersibility of the nonpolar oil of the lipophilic starch.
O: the time for the lipophilic starch to precipitate to the bottom of the test tube is more than 30 minutes.
And (delta): the time for the lipophilic starch to precipitate to the bottom of the tube is 5 to 30 minutes.
X: the time for the lipophilic starch to precipitate to the bottom of the test tube is less than 5 minutes.
1-2 polar oil Dispersion
The term "polar oil-dispersible" as used herein refers to a dispersion of lipophilic starch in a polar oil. The polar oil dispersibility test was carried out by mixing 1: the evaluation criteria of 20 lipophilic starch and medium chain triglyceride after being mixed uniformly and standing, and observing the time of the lipophilic starch precipitating to the bottom of the test tube are shown below, wherein the longer the time of precipitation to the bottom of the test tube, the better the dispersibility of the polar oil of the lipophilic starch.
O: the time for the lipophilic starch to precipitate to the bottom of the test tube is more than 30 minutes.
And (delta): the time for the lipophilic starch to precipitate to the bottom of the tube is 10 to 30 minutes.
X: the time for the lipophilic starch to settle to the bottom of the test tube was less than 10 minutes.
1-3. Water-in-oil cream stability
The stability of the water-in-oil cream refers to the dispersibility (such as homogeneous dispersion, aggregation or layering) of the lipophilic starch in the water-in-oil cream after the lipophilic starch is added into the water-in-oil cream. The stability of the water-in-oil cream is tested by mixing the components in a weight ratio of 1:20, directly observing whether the two are layered after being mixed, wherein the evaluation standard is shown as follows, wherein the less obvious the layering phenomenon is, and the better the stability of the water-in-oil cream of the lipophilic starch is.
O: the delamination phenomenon was not significant.
And (delta): an emulsion layer can be observed.
X: the delamination phenomenon is evident.
1-4. Lipophilic powder uniformity
The uniformity of the lipophilic powder refers to whether the lipophilic starch is aggregated in the matrix of the honey powder. The lipophilic powder uniformity test is carried out by mixing the lipophilic powder with the lipophilic powder in a weight ratio of 1:20, directly observing whether the lipophilic starch is aggregated after uniformly mixing the lipophilic starch and honey powder matrixes, wherein the evaluation criteria are shown as follows, wherein the less obvious the aggregation phenomenon is, and the better the uniformity of the lipophilic powder of the lipophilic starch is.
O: the phenomenon of aggregation is not significant.
And (delta): aggregated particles can be observed.
X: the phenomenon of aggregation is evident.
2. Smooth feeling of skin
The skin-friendly smooth feeling is that after the lipophilic starch is smeared on the skin of a human body, the sensory test is directly used for judging the coating easiness and the attaching condition of the lipophilic starch on the skin, and the evaluation standards are as follows:
o: easy to coat and good in fitting condition.
And (delta): can be applied to skin and applied to skin.
X: is not easy to be coated on the skin and has poor application condition.
3. Sense of freshness
The refreshing feeling referred to in the invention is that after the lipophilic starch is smeared on human skin, the refreshing feeling of the lipophilic starch is directly judged by a sensory test, and the evaluation method is as follows:
o: is fresh and cool without greasy feeling.
And (delta): fresh but slightly greasy.
X: not refreshing and has a heavy greasy feeling.
4. Antibacterial property
The antibacterial property of the invention is the antibacterial property evaluated by a colony count test on lipophilic starch, wherein the culture medium is contacted with hands 1 to 2 times a day, the culture of total bacteria is carried out after 10 continuous days, and the colony count is calculated after 48 hours, and the evaluation criteria are as follows:
o: the antibacterial property is good, and the number of the bacteria is less than 100cfu/mL.
And (delta): the antibacterial property is still good, and the number of the bacteria is 100 to 999cfu/mL.
X: the antibacterial property is poor, and the number of the bacteria is more than 1000cfu/mL.
5. Particle size of lipophilic starch
The particle size of the lipophilic starch referred to in the present invention is measured using a laser particle size analyzer (manufactured by Beckman corporation, model number Coulter LS 230) with a light source of 750nm red solid laser.
TABLE 1
Referring to table 1, the lipophilic starches prepared in examples 1 to 6 using higher alcohols and oils have better non-polar oil dispersibility, lipophilic powder uniformity, skin-friendly smoothness and antibacterial property than those of comparative examples 1 to 3 not using higher alcohols and oils, so that the higher alcohols and oils can form a lipophilic coating layer to increase the lipophilicity of the prepared starch, thereby improving the non-polar oil dispersibility, lipophilic powder uniformity and skin-friendly smoothness and providing lipophilic starch.
The lipophilic starches obtained in examples 1 to 6 using higher alcohols and oils have better non-polar oil dispersibility, skin-friendly smoothness, refreshing feeling and antibacterial property than those of comparative examples 5 to 7 using only higher alcohols or oils. From these results, it was found that the use of higher alcohols together with oils and fats is essential to improve the nonpolar oil dispersibility, skin-friendly smoothness and refreshing feeling of the lipophilic starch and to provide the antibacterial properties of the lipophilic starch.
The lipophilic starches obtained in examples 1 to 6 using an appropriate weight ratio (0.2 to 0.3) of the higher alcohol to the oil or fat have better non-polar oil dispersibility, lipophilic powder uniformity, refreshing feeling and antibacterial property than in comparative example 4 using an excessively high weight ratio (0.4) of the higher alcohol to the oil or fat. It is understood from this that an excessively high weight ratio of the higher alcohol to the oil or fat lowers the stability of the structure of the coating layer, and thus lowers the non-polar oil dispersibility, the lipophilic powder uniformity, the refreshing feeling, and the antibacterial property of the lipophilic starch.
The method for preparing the lipophilic starch is applied, wherein the weight of specific ethanol, higher alcohols and oils and the weight ratio of specific plant starch particles to a dispersion solution can form a lipophilic coating layer on the surface of the plant starch particles, so that the antibacterial property, the dispersibility in a matrix of a cosmetic composition and the skin-friendly smoothness and the refreshing feeling on human skin of the prepared lipophilic starch are improved, and the stability and the comfort of the cosmetic composition containing the lipophilic starch are improved.
Although the present invention has been described with reference to the above embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A method for producing a lipophilic starch, comprising:
providing a dispersion solution containing ethanol, a higher alcohol and oils and fats, wherein the amount of the higher alcohol is 0.5 to 1.5 parts by weight and the amount of the oils and fats is 1 to 10 parts by weight, based on 100 parts by weight of the ethanol; and
spraying and coating the vegetable starch particles, wherein the spraying and coating step is to spray the dispersion solution to the vegetable starch particles in an air flow to obtain the lipophilic starch, and the weight ratio of the vegetable starch particles to the dispersion solution is 1:0.8 to 1:1.2, the lipophilic starch has a lipophilic coating, and the lipophilic coating is substantially free of the ethanol.
2. The method for producing lipophilic starch according to claim 1, wherein the higher alcohol comprises a monohydric alcohol having 12 to 25 carbon atoms and being saturated or unsaturated.
3. The method for producing lipophilic starch according to claim 1, wherein the oil or fat has a solubility in ethanol of 0.005g/g to 0.1g/g at 22 ℃ to 28 ℃.
4. The method for producing lipophilic starch according to claim 1, wherein the weight ratio of the higher alcohol to the oil or fat is not less than 0.1 and less than 0.4.
5. The method for producing lipophilic starch according to claim 1, wherein the dispersion solution is an oil-in-alcohol type dispersion.
6. The method for producing lipophilic starch according to claim 1, wherein the spray coating step is performed for 5 minutes to 4 hours.
7. A lipophilic starch produced by the method for producing a lipophilic starch according to any one of claims 1 to 6.
8. A lipophilic starch comprising:
vegetable starch granules; and
an oleophilic coating on the surface of the plant starch granules,
wherein the plant starch granule and the lipophilic coating layer are in direct contact and have no covalent bond.
9. The lipophilic starch of claim 8, wherein the lipophilic starch has a particle size of 8 μm to 100 μm.
10. A cosmetic composition comprising:
a base, wherein the base comprises a powdered base, an oily base, or an emulsified base; and
the lipophilic starch of any one of claims 8 to 9, wherein the lipophilic starch is homogeneously dispersed in the matrix.
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