CN114272165A - Whitening and firming plant essence skin care emulsion and preparation method thereof - Google Patents
Whitening and firming plant essence skin care emulsion and preparation method thereof Download PDFInfo
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- CN114272165A CN114272165A CN202210026628.3A CN202210026628A CN114272165A CN 114272165 A CN114272165 A CN 114272165A CN 202210026628 A CN202210026628 A CN 202210026628A CN 114272165 A CN114272165 A CN 114272165A
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- whitening
- kenaf
- skin care
- extract
- emulsion
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Landscapes
- Cosmetics (AREA)
Abstract
The invention discloses a whitening and firming plant essence skin care emulsion which comprises the following raw materials: 2-4% of jojoba oil, 1.5-2% of squalane, 0.35-0.5% of nicotinamide, 0.5-1% of polyglycerol stearate, 1.5-2% of tocopherol acetate, 10-12% of glycerol, 0.05-0.1% of methyl paraben, 0.2-0.3% of allantoin, 0.2-0.5% of mannan, 3-5% of kenaf extract and the balance of water. The prepared emulsion has good whitening and tightening effects and is mainly prepared from a pure natural plant formula; the emulsion has uniform texture and better stability; low sensitization and wide audience range.
Description
Technical Field
The invention relates to the technical field of daily chemical products, in particular to a whitening and firming plant essence skin care emulsion and a preparation method thereof.
Background
The skin care product is a daily chemical product for cleaning, repairing, beautifying and maintaining the body surface of people in an external use mode, and can help to protect, repair and improve the using state, thereby fully showing the beauty of the human body and being beneficial to the physical and psychological health of people. Along with the improvement of living standard of people, the status and the importance of skin care products in daily life of people are increasingly improved, especially in recent years, the living rhythm of people is accelerated, the mental stress is higher, the skin condition is worse and worse, and the attention degree to the skin is gradually increased. However, part of emulsion skin care products sold in the current market have the phenomenon that the content of heavy metal components such as lead and mercury exceeds the standard, although the skin care products are not dangerous to life in a short time, the skin can be seriously aged after long-term use, and the body health is influenced, so that the safe pure natural plant skin care products can quickly return.
In ancient times, people began to wipe their face and care their skin with plant juices to keep the skin fine and tender, some had safflower as blush, and some had henna to wash their hair, which was the beginning of natural cosmetics. Ming Dynasty Li Shizhen listed as a facial herb in Ben Cao gang mu, and generalizes the traditional Chinese medicines for skin care in the past generations of herbs. The repeated research of Chinese traditional medicine in skin care prescription in the classic works of Chijin Fang of Chinese medicine by foreign researchers finds that the traditional Chinese medicines such as Sichuan peony root, ledebouriella root, bupleurum root, etc. have obvious effect of resisting tyrosinase inhibition. And the modern main application scientific technology is used for reasonably proportioning and selecting natural herbal plants, extracting and purifying medicinal components and the like, so that the effectiveness and safety of the medicine are ensured.
The plant contains various skin-care nutrient components, wherein the polysaccharide has various pharmacological actions such as oxidation resistance, tumor resistance, aging resistance, inflammation resistance and the like, and a large number of hydrophilic warp groups in the structure make the polysaccharide have better water absorption, shaving performance, emulsification performance, film forming performance and the like when the polysaccharide is externally used, and the polysaccharide can generate the effects of moisturizing, repairing damaged skin, oxidation resistance, aging resistance and the like when being applied to cosmetics. The flavonoids are natural phenolic compounds with special structures, exist in free states or glycosides in plants, and have the effects of whitening, resisting oxidation, resisting inflammation, inhibiting bacteria, preventing sunlight and the like. The flavonoid compound can effectively inhibit tyrosinase activity, thereby slowing down melanin formation. Part of the flavonoid compounds contain a large amount of phenolic hydroxyl groups with reducibility and hydrophilicity, so that the flavonoid compounds can eliminate free radicals, thereby delaying aging. In addition, the flavonoid compound can reduce the expression level of inflammatory mediators and has effective anti-inflammation; can crack the microbial cell membrane to improve the permeability of the cell membrane and kill the microbe; can effectively absorb ultraviolet light and has good sun-screening effect. The organic acid is an acidic compound and has the functions of bacteriostasis, whitening, antioxidation and the like. The exertion of the bacteriostasis of the organic acid is related to the bacteriostasis mechanisms of destroying the structural integrity of the membrane, competing with the energy of microorganisms, preventing the synthesis of macromolecules, increasing the intracellular osmotic pressure, inducing the expression of host cell antibacterial peptide and the like. The organic acid can also effectively inhibit the activity of melanin synthesis related enzyme and play a role in whitening; free radicals can be bound to block or slow down the progress of the oxidation process.
Chinese patent CN 105193882A discloses a kenaf extract, a cosmetic composition thereof and an application thereof, wherein kenaf roots are extracted by 85-95% ethanol, and the obtained kenaf extract is applied to cosmetics and medicines, but related researches on kenaf leaves are not described.
Chinese patent CN 107184528A discloses a whitening emulsion and a preparation method thereof; the whitening emulsion is prepared from the following raw materials: licorice extract, herb of Chinese prickly ash, rose water, royal jelly, olive oil and deionized water; according to the invention, the compatibility of the liquorice and the Chinese herbal medicines with skin whitening and caring functions enhances the respective effects of the liquorice and the Chinese herbal medicines, so that the whitening effect is enhanced; the raw materials are natural components without irritation, so that the whitening and moisturizing effects can be achieved, no irritation is caused to skin, and the skin-care cream can be used for a long time; the preparation process is simple to operate, has low requirements on equipment, and reduces the production cost while ensuring the production quality.
CN 106726763 a discloses a whitening emulsion and a preparation method thereof, wherein the whitening emulsion comprises the following components in percentage by weight: 6-12% of 20-hydroxyecdysterone, 5-10% of dipotassium glycyrrhizinate, 2-6% of vitamin C, 2-4% of glycerol, 1-5% of ellagic acid, 2-6% of hyaluronic acid, 1-2% of beeswax, 1-2% of sodium alginate, 0.1-0.5% of citric acid, 0.1-0.5% of methylisothiazolinone and 50-79.8% of water. The whitening emulsion provided by the invention can effectively improve darkness, spots and aging resistance, block melanin production, increase skin moistening degree and lubricity, has a good whitening effect, and is safe and non-irritant. However, in the prior art, the whitening emulsion emphasizes that the stability, uniformity and texture of the emulsion are poor due to no addition of natural plant ingredients, so that the preparation of the skin care emulsion with natural ingredients, good whitening effect and firming effect, uniform texture and good stability is particularly important.
Disclosure of Invention
In order to solve the technical problems, the invention provides a whitening and firming plant essence skin care emulsion and a preparation method thereof, and the technical scheme is as follows:
a whitening and firming plant essence skin care emulsion comprises the following raw materials: 2-4% of jojoba oil, 1.5-2% of squalane, 0.35-0.5% of nicotinamide, 0.5-1% of polyglycerol stearate, 1.5-2% of tocopherol acetate, 10-12% of glycerol, 0.05-0.1% of methyl paraben, 0.2-0.3% of allantoin, 0.2-0.5% of mannan and the balance of water.
Nicotinamide, also known as nicotinamide, 3-pyridinecarboxamide, is an amide compound of nicotinic acid and is also a derivative of vitamin B3. Is a white crystalline powder, slightly or almost odorless, bitter, and is vitamin PP, which belongs to azacyclo-pyridine derivatives. It is easily soluble in water or ethanol, and soluble in glycerol. The whitening mechanism of niacinamide comprises three aspects: (1) inhibiting the formation of melanin granules; (2) inhibiting the transfer of melanin to keratinocytes; (3) accelerate the transfer of melanin to the stratum corneum in keratinocytes and promote stratum corneum exfoliation.
Squalane, also known as deep-sea shark liver oil, squalane, isotridecane. Originally, squalane was obtained by hydrogenation of squalene extracted from the liver of deep-sea sharks by scientists. However, it has recently been found that squalane can be extracted in small amounts from olive oil, rice bran oil, wheat germ oil, yeast, and the like. Squalane is a kind of grease most similar to human sebum, has high-efficiency oxygen carrying performance, can be integrated with human sebum after being used, forms a protective film with good permeability on the surface layer of skin, enables the skin to successfully metabolize water and air, can prevent water loss and nourish the skin, and is not greasy. The squalane maintains the balance between skin and sebum, can improve the moisture and other nutrition absorption capacity of the skin while deeply preserving moisture, can improve the skin problems of relaxation, dryness, desquamation, roughness, darkness and the like after long-term use, and helps the skin to recover tender.
The substances such as niacinamide, squalane and the like become conventional functional components in skin care products and can play basic whitening and moisturizing effects, and consumers have higher and higher requirements on the functions of the skin care products on the market and simultaneously keep the low sensitivity and the pure natural property of the skin care product components. Therefore, in addition to the basic formulation, small amounts of plant extracts are often added to skin care products to achieve specific effects. Conventional plant extracts such as rose extract, glycyrrhiza glabra extract, honeysuckle extract, scutellaria extract and the like are adopted, but the functional characteristics of the plant extracts in the prior art are still single and are often matched for use.
Kenaf malaysia, Hibiscus L, Hibiscus syriacus, annual herb bast fiber crops, soft bast fibers, strong fiber tension, strong adaptability to climate and environment, and has the characteristics of drought resistance, saline-alkali resistance, barren resistance and the like, and easy cultivation. Kenaf is an important raw material in the traditional hemp spinning industry, and the fiber of the kenaf is developed into various products. For a long time, research and development of the kenaf mostly focuses on fibers, and breeding targets mostly focus on improving the yield and quality of the fibers. However, other parts of kenaf correspondingly have different biological activities and functional characteristics, for example, kenaf seed oil extracted from kenaf seeds can be further processed to obtain biodiesel and biological lubricating oil, and the kenaf seed oil mainly contains oleic acid and linoleic acid, and has the effects of resisting cancer and oxidation, reducing blood cholesterol, preventing hypertension, preventing atherosclerosis and the like; radix et rhizoma Rhei extract can be prepared from radix et rhizoma Rhei, and can be used for treating cardiovascular diseases; the kenaf leaves with the most abundant content of phenolic compounds have high total phenol content and protein content, the nutritive value of the kenaf leaves is equivalent to that of alfalfa, the kenaf leaves are rich in various vitamins and amino acids, the kenaf leaves are good vegetable protein feed raw materials and are also commonly used as feed processing, but the inventor finds that the extract of the kenaf leaves after extraction contains a large amount of chlorogenic acid, coffee auxiliary agents, kaempferol, hydrated catechin and the like, and the kenaf leaf extract has good tyrosinase resistance and can also play a role in skin tightening.
Further, the whitening and firming plant essence skin care emulsion comprises the following raw materials: 2-4% of jojoba oil, 1.5-2% of squalane, 0.35-0.5% of nicotinamide, 0.5-1% of polyglycerol stearate, 1.5-2% of tocopherol acetate, 10-12% of glycerol, 0.05-0.1% of methyl paraben, 0.2-0.3% of allantoin, 0.2-0.5% of mannan, 3-5% of kenaf extract and the balance of water.
Preferably, the dogwood leaf extract is prepared by the following method: cleaning the kenaf leaves with water, airing, and storing at-80 to-60 ℃ for 10 to 12 hours; then freeze-drying at-50-40 deg.C for 40-48 h, taking out and grinding to obtain folium Cannabis powder; weighing 3-5 g of kenaf leaf powder, adding 60-100 mL of an ammonia alcohol solution, extracting at 70-75 ℃ for 2-3 h, cooling and filtering, keeping supernatant, taking filter residue, adding an ammonia alcohol solution with the same mass, extracting for 2-3 h, filtering, combining the two filtrates, and performing reduced pressure fractionation at 55-60 ℃ to obtain a paste extract, namely the kenaf leaf extract.
However, in the process of preparing the whitening and firming plant essence skin care emulsion, the emulsion is easy to cause unstable texture after the kenaf extract is added, uniform emulsion is difficult to form, and the storage stability of the product is poor. Therefore, it is necessary to add a stabilizer, a thickener, and the like to improve the state of the emulsion on this basis.
Bacterial cellulose, chemically identical to wood or plant cellulose, but obtained by fermentation in the pure state, consists of long fibers of nanometric thickness (high aspect ratio). The use of bacterial cellulose in biomedical applications has been significantly studied, as has the production of composites, the production and stabilization of emulsions and other food systems, optoelectronics, and others in most fields. In recent years, bacterial cellulose has been applied in the development of cosmetic masks as a substrate for hydrophilic cosmetic compounds for skin care, for moisturizing, rejuvenating, delaying aging and wound treatment. The inventor finds that the combination of the bacterial cellulose and the kenaf leaf extract can effectively improve the whitening effect and the stability of the kenaf leaf extract, and phenolic compounds in the kenaf leaf extract have an amphiphilic structure as plant secondary metabolites, namely the phenolic compounds contain hydrophilic groups and hydrophobic aromatic groups. Therefore, the structure can interact with the bacterial cellulose through non-covalent interaction, such as hydrogen bond and hydrophobic force, and the bonding is more compact and the hydrophobic interaction is stronger compared with the bonding of single phenolic substances due to more aromatic groups contained in the kenaf extract.
Most preferably, the whitening and firming plant essence skin care emulsion comprises the following raw materials: 2-4% of jojoba oil, 1.5-2% of squalane, 0.35-0.5% of nicotinamide, 0.5-1% of polyglycerol stearate, 1.5-2% of tocopherol acetate, 10-12% of glycerol, 0.05-0.1% of methyl paraben, 0.2-0.3% of allantoin, 0.2-0.5% of mannan, 3-5% of kenaf extract-bacterial cellulose complex and the balance of water.
Preferably, the kenaf extract-bacterial cellulose compound is prepared by the following method: cleaning the kenaf leaves with water, airing, and storing at-80 to-60 ℃ for 10 to 12 hours; then freeze-drying at-50-40 deg.C for 40-48 h, taking out and grinding to obtain folium Cannabis powder; weighing 3-5 g of kenaf powder, adding 60-100 mL of an ammonia alcohol solution, extracting at 70-75 ℃ for 2-3 h, cooling, filtering, keeping supernatant, taking filter residue, adding an ammonia alcohol solution with equal mass, extracting for 2-3 h, filtering, combining the two filtrates, and performing reduced pressure fractionation at 55-60 ℃ to obtain a paste extract; and then 0.5-1 g of bacterial cellulose freeze-dried powder is added into the paste extract, and the mixture is stirred and mixed uniformly.
The whitening and firming plant essence skin care emulsion is prepared by the following method, and comprises the following steps:
s1, weighing jojoba oil, squalane, nicotinamide, polyglycerol stearate, tocopherol acetate, glycerol, methyl paraben, allantoin, mannan and water according to the formula, uniformly mixing, heating to 75-80 ℃, stirring to completely dissolve solids, and homogenizing at the rotating speed of 2500-4500 rpm under 20-30 MPa for 10-15 min to obtain uniform white emulsion;
s2, cooling the emulsion obtained in the step S1 to 40-45 ℃, adding the kenaf extract or the kenaf extract-bacterial cellulose compound, stirring at 2000-3000 rpm for 10-15 min, and standing for 5-6 h to obtain the whitening and firming plant essence skin care emulsion.
Furthermore, the volume fraction of ethanol in the ammoniacal alcoholic solution is 55-60%, the volume fraction of ammonia gas is 5-6%, and the balance is water.
Compared with the prior art, the invention has the following beneficial effects:
1) the whitening and firming effect is good, the components are natural, and a pure natural plant formula is taken as a main component;
2) the emulsion has uniform texture and better stability;
3) low sensitization and wide audience range.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention. The operations referred to in the examples are, unless otherwise specified, all those of ordinary skill in the art.
Some raw material parameters in the comparative examples and examples of the invention are as follows:
jojoba oil, available from jia beauty cosmetics ltd, guangzhou;
squalane, CAS: 111-01-3, available from north Hu Ke Ward chemical Co., Ltd;
methylparaben, CAS: 99-76-3, available from boyuan biotechnology limited, Hubei;
polyglycerol stearate, CAS: 105437-03-4, available from Habei Handa Biotech, Inc.
N-methylmorpholine-N-oxide, CAS: 7529-22-8, available from Shanghai leaf Biotech, Inc.
Pyridine sulfate, CAS: 543-54-4, available from shanghai hakang biotechnologies, ltd.
Example 1
A preparation method of a whitening and firming plant essence skin care emulsion comprises the following steps:
s1 preparation of the kenaf extract: cleaning folium Cannabis with water, air drying, and storing at-60 deg.C for 12 hr; freeze drying at-40 deg.C for 48h, taking out, and grinding to obtain folium Sesami powder; weighing 5g of kenaf leaf powder, adding 100mL of ammoniacal alcohol solution, extracting at 75 ℃ for 3h, cooling, filtering, keeping supernatant, adding the same mass of ammoniacal alcohol solution into filter residue, extracting for 3h, filtering, combining the two filtrates, and performing reduced pressure fractionation at 60 ℃ to obtain a paste extract, namely the kenaf leaf extract;
s2, weighing 4g of jojoba oil, 2g of squalane, 0.5g of nicotinamide, 1g of polyglycerol stearate, 2g of tocopherol acetate, 10g of glycerol, 0.05g of methyl paraben, 0.25g of allantoin, 0.3g of mannan and 76.9mL of water, uniformly mixing, heating to 75 ℃, stirring to completely dissolve solids, and homogenizing at 30MPa and 3000rpm for 12min to obtain uniform white emulsion;
s3, cooling the emulsion obtained in the step S2 to 40 ℃, adding 3g of the kenaf extract obtained in the step S1, stirring at 3000rpm for 10min, and standing for 5h to obtain the whitening and firming plant essence skin care emulsion.
The volume fraction of ethanol, the volume fraction of ammonia gas and the volume fraction of water in the ammoniacal alcohol solution are 60%, 5% and 35%, respectively.
Comparative example 1
A preparation method of a whitening and firming plant essence skin care emulsion comprises the following steps:
s1, weighing 4g of jojoba oil, 2g of squalane, 0.5g of nicotinamide, 1g of polyglycerol stearate, 2g of tocopherol acetate, 10g of glycerol, 0.05g of methyl paraben, 0.25g of allantoin, 0.3g of mannan and 79.9mL of water, uniformly mixing, heating to 75 ℃, stirring to completely dissolve solids, and homogenizing at the rotating speed of 3000rpm under 30MPa for 12min to obtain uniform white emulsion;
s2, cooling the emulsion obtained in the step S1 to 40 ℃, stirring at 3000rpm for 10min, and standing for 5h to obtain the whitening and firming plant essence skin care emulsion.
Example 2
A preparation method of a whitening and firming plant essence skin care emulsion comprises the following steps:
s1 preparation of a kenaf extract-bacterial cellulose complex: cleaning folium Cannabis with water, air drying, storing at-60 deg.C for 12 hr, freeze drying at-40 deg.C for 48 hr, taking out, and grinding to obtain folium Cannabis powder; weighing 5g of kenaf leaf powder, adding 100mL of ammoniacal alcohol solution, extracting at 75 ℃ for 3h, cooling, filtering, keeping supernatant, adding the same mass of ammoniacal alcohol solution into filter residue, extracting for 3h, filtering, combining the two filtrates, and performing reduced pressure fractionation at 60 ℃ to obtain a kenaf leaf extract; then 0.8g of bacterial cellulose freeze-dried powder is added into the kenaf extract to be uniformly stirred to obtain a kenaf extract-bacterial cellulose compound;
s2, weighing 4g of jojoba oil, 2g of squalane, 0.5g of nicotinamide, 1g of polyglycerol stearate, 2g of tocopherol acetate, 10g of glycerol, 0.05g of methyl paraben, 0.25g of allantoin, 0.3g of mannan and 76.9mL of water, uniformly mixing, heating to 75 ℃, stirring to completely dissolve solids, and homogenizing at the rotating speed of 3000rpm under 30MPa for 12min to obtain uniform white emulsion;
s3, cooling the emulsion obtained in the step S2 to 40 ℃, adding 3g of the kenaf extract-bacterial cellulose compound prepared in the step S1, stirring at 3000rpm for 10min, and standing for 5h to obtain the whitening and firming plant essence skin care emulsion.
The volume fraction of ethanol, the volume fraction of ammonia gas and the volume fraction of water in the ammoniacal alcohol solution are 60%, 5% and 35%, respectively.
The bacterial cellulose is a fibrous nano material with an ultra-high length-diameter ratio, which is obtained by taking saccharides as raw materials and performing biological fermentation on Acetobacter aceti, wherein the diameter of the fiber is 50-100 nm, the length of the fiber is more than 20um, and the water absorption rate is about 200 times, and freeze-dried bacterial cellulose with the particle size is used in the invention: 50-100 nm, available from Guilin Qihong science and technology Co.
Example 3
A preparation method of a whitening and firming plant essence skin care emulsion comprises the following steps:
s1 preparation of a kenaf extract-bacterial cellulose complex: cleaning folium Cannabis with water, air drying, and storing at-60 deg.C for 12 hr; freeze drying at-40 deg.C for 48h, taking out, and grinding to obtain folium Sesami powder; weighing 5g of kenaf leaf powder, adding 100mL of ammoniacal alcohol solution, extracting at 75 ℃ for 3h, cooling, filtering, keeping supernatant, adding the same mass of ammoniacal alcohol solution into filter residue, extracting for 3h, filtering, combining the two filtrates, and performing reduced pressure fractionation at 60 ℃ to obtain a kenaf leaf extract; adding 0.8g of composite bacterial cellulose into the kenaf extract, and uniformly stirring;
s2, weighing 4g of jojoba oil, 2g of squalane, 0.5g of nicotinamide, 1g of polyglycerol stearate, 2g of tocopherol acetate, 10g of glycerol, 0.05g of methyl paraben, 0.25g of allantoin, 0.3g of mannan and 76.9mL of water, uniformly mixing, heating to 75 ℃, stirring to completely dissolve solids, and homogenizing at the rotating speed of 3000rpm under 30MPa for 12min to obtain uniform white emulsion;
s3, cooling the emulsion obtained in the step S2 to 40 ℃, adding 3g of the kenaf extract-bacterial cellulose compound prepared in the step S1, stirring at 3000rpm for 10min, and standing for 5h to obtain the whitening and firming plant essence skin care emulsion.
The volume fraction of ethanol, the volume fraction of ammonia gas and the volume fraction of water in the ammoniacal alcohol solution are 60%, 5% and 35%, respectively.
The composite bacterial cellulose is prepared by the following method: adding 2g of freeze-dried bacterial cellulose into 10mL of 0.1mol/L NaOH aqueous solution, soaking for 12h, then washing for 4 times by using distilled water, then dropwise adding 3mL of N-methylmorpholine-N-oxide, wet-grinding at 9000rpm, then weighing 0.65g of pyridine sulfate, continuously stirring, slowly adding 5mL of absolute ethyl alcohol, sealing by using a preservative film, standing for 8h, carrying out suction filtration to obtain filtrate, then adding 0.5g of sodium carboxymethyl cellulose, heating to 80 ℃, then stirring at 300rpm for 12h, carrying out autoclaved treatment at 121 ℃ for 20 min, taking out, cooling to room temperature, and then carrying out freeze drying at-40 ℃ for 10h to obtain the composite bacterial cellulose.
The inventor finds that the whitening effect can be remarkably improved after the bacterial cellulose is combined with the kenaf extract, and the bacterial cellulose is an excellent carrier matrix and can effectively protect the biological activity of the kenaf extract, but a small part of the bacterial cellulose is easy to agglomerate after being added into the emulsion, so that the bacterial cellulose is further treated, and the stability of the emulsion is further improved by combining a small amount of N-methylmorpholine-N-oxide, pyridine sulfate, carboxymethyl cellulose and the bacterial cellulose.
Test example 1
The whitening and tightening plant essence skin care emulsions of examples 1 to 3 and comparative example 1 were subjected to whitening evaluation tests in reference to the test method of the society of daily chemicals of Shanghai Standard T/SHRH 015-. The method comprises the following specific steps: a10 mL test tube was used to set up sample tubes (T), sample background (T0), enzyme reaction tubes (C) and solvent background (C0), 3 parallel tubes were set up for each sample concentration of sample tubes (T), and 3 parallel tubes were set up for enzyme reaction tubes (C). 1mL of the same concentration sample solution was added to each of the sample tube (T) and the sample background (T0), and 1mL of disodium hydrogenphosphate-citric acid buffer was added to each of the enzyme reaction tube (C) and the solvent background (C0). 0.5mL of tyrosinase solution was added to each of the sample tube (T) and the enzyme reaction tube (C), the sample background (T0) and the solvent background (C0) were replaced with 0.5mL of disodium hydrogen phosphate-citric acid buffer, the samples and tyrosinase were mixed well, and incubated in a 37 ℃ water bath for 10 minutes. And sequentially adding 2mL of levodopa solution into each tube, controlling the reaction time of each tube to be 5 minutes, immediately transferring each tube of reaction solution into a cuvette, and measuring the light absorption value at 475 nm. The calculation formula is as follows:
TABLE 1 tyrosinase activity inhibition test results Table
Inhibition rate/%) | |
Comparative example 1 | 57.05% |
Example 1 | 73.08% |
Example 2 | 76.52% |
Example 3 | 77.69% |
As can be seen from table 1, the whitening emulsion containing the kenaf extract has a significant whitening effect, and the stronger the inhibition effect on tyrosinase activity, the better the effect of inhibiting melanin production. The whitening effect of the kenaf extract can be further effectively improved after the bacterial cellulose and the kenaf extract are combined, and phenolic compounds in the kenaf extract have an amphiphilic structure as plant secondary metabolites, namely the phenolic compounds contain hydrophilic groups and hydrophobic aromatic groups. Therefore, the structure can interact with the bacterial cellulose through non-covalent interaction, such as hydrogen bond and hydrophobic force, and the bonding is more compact and the hydrophobic interaction is stronger compared with the bonding of single phenolic substances due to more aromatic groups contained in the kenaf extract. After the bacterial cellulose is combined with the kenaf leaf extract, the kenaf leaf extract has better permeability and can better exert the functional activity.
Test example 2
The whitening and tightening plant essence skin care emulsions of examples 1-3 and comparative example 1 were subjected to stability tests, and the prepared emulsions were subjected to high-temperature, low-temperature and cold-hot alternate storage stability tests with reference to GB/T29665-2013. Centrifuging at 3000rpm for 30min, and observing whether the emulsion is layered; continuously keeping the temperature at 48 ℃ for 20 days, then recovering the room temperature and keeping the room temperature for more than 8 hours, and observing whether the emulsion has layering, solid precipitation or other inhomogeneous phenomena; continuously freezing at-25 deg.C for 20d, recovering to room temperature, maintaining for more than 8h, and observing whether the emulsion has layering, solid precipitation or other inhomogeneous phenomenon; alternately circulating for 24h at 48 deg.C and-25 deg.C for 20d, recovering to room temperature, maintaining for more than 8h, and observing whether the emulsion has layering, solid precipitation or other inhomogeneous phenomenon. In the above test, if the emulsions have no delamination, solids precipitation or other inhomogeneities, the stability test is passed, otherwise the stability test is failed. The test results are shown in Table 2.
Table 2 emulsion stability test results
High temperature | Low temperature | Alternating cold and hot | |
Example 1 | Do not pass through | By passing | Do not pass through |
Example 2 | By passing | By passing | Do not pass through |
Example 3 | By passing | By passing | By passing |
Comparative example 1 | Do not pass through | By passing | Do not pass through |
The storage stability of the emulsion is tested, and the test result shows that the high-temperature storage stability of the emulsion added with the bacterial cellulose is obviously improved, but partial sedimentation occurs in cold and hot alternate storage.
Test example 3
The whitening and firming plant essence skin care emulsions of examples 1 to 3 and comparative example 1 were subjected to an oxidation resistance test, and the emulsions prepared in examples and comparative examples were stored for 0 day and 25 ℃ for 60 days in a sealed manner to measure DPPH radical scavenging rates, respectively: taking 3mL of the same volume of the solution to be detected and 2 multiplied by 10﹣4mixing the solution of DPPH in mol/L (A1 tube); taking equal volume of absolute ethyl alcohol and 2 multiplied by 10﹣4mixing the solution of DPPH in mol/L (A2 tube); taking absolute ethyl alcohol with the same volume and uniformly mixing the absolute ethyl alcohol with a solution to be detected (A3 tube); after 30min of dark reaction at 30 ℃, the absorbance values of tubes A1, A2 and A3 were measured at 517nm with distilled water as blank and recorded as ODA1, ODA2 andODA 3. DPPH radical clearance was calculated according to the following formula, and the test results are shown in table 3:
TABLE 3 DPPH radical scavenging Rate test results Table
The higher the DPPH free radical clearance rate, the stronger the oxidation resistance of the sample, the higher the oxidation resistance due to the large amount of chlorogenic acid, coffee adjuvant, kaempferol, hydrated catechin and the like contained in the kenaf extract, while the addition of the bacterial cellulose during the emulsion processing has a better effect on the phenolic components in the kenaf extract, and the loss rate during the storage period is lower than that of the compound bacterial cellulose, as can be seen from comparative examples 2 and 3, the effectiveness of the active components of the whitening emulsion during the long-term storage period is further enhanced by the compound bacterial cellulose.
Claims (10)
1. The whitening and firming plant essence skin care emulsion is characterized by comprising the following raw materials: jojoba oil, squalane, nicotinamide, polyglycerol stearate, tocopherol acetate, glycerol, methyl paraben, allantoin, mannan, and water.
2. The whitening and firming plant essence skin care emulsion is characterized by comprising the following raw materials: jojoba oil, squalane, nicotinamide, polyglycerol stearate, tocopherol acetate, glycerol, methyl paraben, allantoin, mannan, kenaf extract and water.
3. The whitening and tightening plant essence skin care emulsion as defined in claim 2, comprising the following raw materials by mass: 2-4% of jojoba oil, 1.5-2% of squalane, 0.35-0.5% of nicotinamide, 0.5-1% of polyglycerol stearate, 1.5-2% of tocopherol acetate, 10-12% of glycerol, 0.05-0.1% of methyl paraben, 0.2-0.3% of allantoin, 0.2-0.5% of mannan, 3-5% of kenaf extract and the balance of water.
4. The whitening and tightening plant essence skin care emulsion as claimed in claim 2 or 3, wherein the kenaf extract is prepared by the following method: cleaning the kenaf leaves with water, airing, and storing at-80 to-60 ℃ for 10 to 12 hours; then freeze-drying at-50-40 deg.C for 40-48 h, taking out and grinding to obtain folium Cannabis powder; weighing 3-5 g of kenaf leaf powder, adding 60-100 mL of an ammonia alcohol solution, extracting at 70-75 ℃ for 2-3 h, cooling and filtering, keeping supernatant, taking filter residue, adding an ammonia alcohol solution with the same mass, extracting for 2-3 h, filtering, combining the two filtrates, and performing reduced pressure fractionation at 55-60 ℃ to obtain a paste extract, namely the kenaf leaf extract.
5. The whitening and firming plant essence skin care emulsion is characterized by comprising the following raw materials in percentage by mass: 2-4% of jojoba oil, 1.5-2% of squalane, 0.35-0.5% of nicotinamide, 0.5-1% of polyglycerol stearate, 1.5-2% of tocopherol acetate, 10-12% of glycerol, 0.05-0.1% of methyl paraben, 0.2-0.3% of allantoin, 0.2-0.5% of mannan, 3-5% of kenaf extract-bacterial cellulose complex and the balance of water.
6. The whitening and tightening plant essence skin care emulsion as claimed in claim 5, wherein the kenaf extract-bacterial cellulose complex is prepared by the following method: cleaning the kenaf leaves with water, airing, and storing at-80 to-60 ℃ for 10 to 12 hours; then freeze-drying at-50-40 deg.C for 40-48 h, taking out and grinding to obtain folium Cannabis powder; weighing 3-5 g of kenaf powder, adding 60-100 mL of an ammonia alcohol solution, extracting at 70-75 ℃ for 2-3 h, cooling, filtering, keeping supernatant, taking filter residue, adding an ammonia alcohol solution with equal mass, extracting for 2-3 h, filtering, combining the two filtrates, and performing reduced pressure fractionation at 55-60 ℃ to obtain a paste extract; and then 0.5-1 g of bacterial cellulose freeze-dried powder is added into the paste extract, and the mixture is stirred and mixed uniformly.
7. The preparation method of the whitening and tightening plant essence skin care emulsion as claimed in any one of claims 2 to 6, characterized by comprising the following steps:
s1, weighing jojoba oil, squalane, nicotinamide, polyglycerol stearate, tocopherol acetate, glycerol, methyl paraben, allantoin, mannan and water according to the formula, uniformly mixing, heating to 75-80 ℃, stirring to completely dissolve solids, and homogenizing to obtain uniform white emulsion;
s2, cooling the emulsion obtained in the step S1 to 40-45 ℃, adding the kenaf extract or the kenaf extract-bacterial cellulose compound, uniformly stirring, and standing for 5-6 hours to obtain the whitening and firming plant essence skin care emulsion.
8. The method for preparing the whitening and tightening plant essence skin care lotion according to claim 7, wherein the homogenizing conditions in the step S1 are as follows: homogenizing at 2500-4500 rpm under 20-30 MPa for 10-15 min.
9. The method for preparing the whitening and tightening plant essence skin care lotion according to claim 7, wherein the stirring conditions in the step S2 are as follows: stirring at 2000-3000 rpm for 10-15 min.
10. The whitening and tightening plant essence skin care emulsion as claimed in claim 7, wherein the volume fraction of ethanol in the ammoniacal alcohol solution is 55-60%, the volume fraction of ammonia gas is 5-6%, and the balance is water.
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