Whitening essence suitable for sensitive skin and preparation method thereof

Abstract

The invention relates to the technical field of whitening essence, and discloses whitening essence suitable for sensitive skin and a preparation method thereof.The whitening essence suitable for sensitive skin is prepared from, by mass, 2%-3% of prinsepia utilis royle oil, 1%-2% of portulaca oleracea extract, 1.5% of camellia yunnanensis flower extract, 0.5% of panax notoginseng root extract, 3% or less of nicotinamide, 1% or less of 1, 2-propylene glycol and the balance deionized water. 1%-1.5% of 1, 2-hexanediol, 0.1%-0.3% of sodium hyaluronate and 60%-70% of deionized water. According to the whitening essence suitable for the sensitive skin and the preparation method of the whitening essence, through the synergistic combination of prinsepia utilis royle oil (barrier repair), purslane (anti-inflammatory), camellia japonica (tyrosinase inhibition) and pseudo-ginseng (microcirculation improvement), melanogenesis is inhibited through multiple channels, the sensitive skin is relieved synchronously, nicotinamide (3%) is compounded with the prinsepia utilis royle oil, and the skin whitening effect is achieved. The synergism of whitening and barrier repair is enhanced through a dual mechanism of promoting ceramide synthesis and inhibiting melanin transport, and the problems that a traditional whitening agent has different degrees of irritation, allergy phenomena such as skin redness, swelling and pain are easily caused by improper use, and a skin intolerance phenomenon exists are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of whitening essences, in particular to a whitening essence suitable for sensitive skin and a preparation method thereof. Background Art

[0002] Whitening has always been a hot topic among Asian women. With the continuous development of society and the internet, consumers' awareness of skincare has gradually increased, and they are placing greater emphasis on the safety and efficacy of cosmetics. Consumers expect skincare products to be both effective and gentle and safe. To meet market demands, developers are adjusting product whitening ingredients or modifying preparation methods to meet these needs.

[0003] Whitening ingredients usually achieve their whitening effects by inhibiting the activity of enzymes such as tyrosinase in the melanin production pathway, reducing synthesized melanin or inhibiting the oxidation of DOPA itself, inhibiting the transfer of melanosomes, scavenging free radicals, accelerating skin metabolism and shedding of the stratum corneum, etc.

[0004] Common whitening agents include niacinamide, vitamin C and its derivatives, phenylethylresorcinol, resveratrol, arbutin and its derivatives. However, these agents are all irritating to varying degrees and can easily cause allergic reactions such as redness, swelling, and pain, leading to skin intolerance. Therefore, a whitening essence suitable for sensitive skin and a preparation method thereof are proposed to address these issues. Summary of the Invention

[0005] (1) Technical problems solved

[0006] In response to the deficiencies in the prior art, the present invention provides a whitening essence suitable for sensitive skin and a preparation method thereof, which has the advantage of milder ingredients and solves the problem that common whitening agents include niacinamide, vitamin C and its derivatives, phenylethylresorcinol, resveratrol, arbutin and its derivatives, etc. However, the above-mentioned whitening agents all have varying degrees of irritation, and improper use can easily cause allergic phenomena such as redness, swelling and pain on the skin, and there is a problem of skin intolerance.

[0007] (2) Technical solution

[0008] In order to achieve the purpose of making the above ingredients milder and more effective, the present invention provides the following technical solution: a whitening essence suitable for sensitive skin, comprising the following components by mass percentage:

[0009] Prinus purpurogenum oil 2%-3%

[0010] Portulaca oleracea extract 1%-2%

[0011] Camellia sinensis extract 1.5%

[0012] Panax notoginseng root extract 0.5%

[0013] Niacinamide ≤3%

[0014] 1,2-Hexanediol 1%-1.5%

[0015] Sodium hyaluronate 0.1%-0.3%

[0016] Deionized water 60%-70%.

[0017] Preferably, the preparation method of the whitening essence comprises the following steps:

[0018] Step 1: Heat deionized water (60%-70%) to 75°C, add sodium hyaluronate and 1,2-hexanediol, and stir until completely dissolved;

[0019] Step 2: Cool to 50°C, add purslane extract and Camellia sinensis extract, and maintain low-speed stirring to generate phase A;

[0020] Step 3: Mix the utilitarian fruit oil, Panax notoginseng root extract (lipid-soluble carrier) and polysorbate 80 (0.5%), and heat to 40° C. for homogenization;

[0021] Step 4: Add the niacinamide pre-dispersion moistened with propylene glycol to form phase B;

[0022] Step 5: Slowly add phase B to phase A, maintain a constant temperature of 50°C, and use a high shear emulsifier to form a primary emulsion;

[0023] Step 6: Gradual cooling to 40°C, adding pH adjuster (citric acid / sodium citrate) to control the pH in the range of 5.0-5.5;

[0024] Step 7: Filter through a 0.22 μm microporous filter membrane to remove impurities and use disposable sterile vacuum packaging.

[0025] Preferably, the method for preparing the purslane extract in step 2 further comprises the following steps:

[0026] Step 21: Rinse the fresh purslane whole herb with ozone water for 5 minutes to remove surface microorganisms and impurities;

[0027] Step 22: Drain and air dry at room temperature to avoid high temperatures destroying the active ingredients;

[0028] Step 23: Grinding the dried purslane into 80-100 mesh fine powder with a particle size of ≤150 μm using a jet mill;

[0029] Step 24: Mix purslane powder and purified water at a ratio of 1:10, add cellulase (0.2%) and pectinase (0.1%), and perform enzymatic hydrolysis at 40° C. for 2 hours (to release flavonoids in the cell wall);

[0030] Step 25: After enzymatic hydrolysis, the temperature was raised to 90°C to inactivate the enzymes and maintained for 30 minutes;

[0031] Step 26: Separate and concentrate the product through a microfiltration membrane (0.45 μm) and a nanofiltration membrane (500 Da), with a molecular weight cutoff of 1000-5000 Da.

[0032] Step 27: vacuum low-temperature concentration: temperature ≤ 45°C, vacuum degree -0.08 MPa, to a concentrate with a solid content of 30%.

[0033] Preferably, the specific preparation of the Camellia dahliae extract in step 2 comprises the following steps:

[0034] Step 201: Select fresh Yunnan camellia petals from high altitude areas, wash them with ozone water spray for 3 minutes, and then dry them with cold air (temperature ≤ 35° C., humidity ≤ 40%).

[0035] Step 202: Grinding to 60-80 mesh (particle size ≤ 250 μm) using a low-temperature airflow mill;

[0036] Step 203: petal powder and pure water are mixed at a ratio of 1:15, β-glucanase (0.3%) and cellulase (0.1%) are added, and enzymatic hydrolysis is carried out at 45° C. for 1.5 hours to destroy the cell wall structure;

[0037] Step 204: using 50% ethanol as the solvent, ultrasonically extracting at a power of 200 W and a frequency of 40 kHz for 30 minutes, centrifuging (5000 rpm, 20 minutes) to separate the solid and liquid phases, and collecting the supernatant;

[0038] Step 205: Concentrating temperature ≤ 40°C, vacuum degree -0.07 MPa, evaporating water to a solid content ≥ 25%;

[0039] Step 206: Using liposomes as carriers (phosphatidylcholine: cholesterol = 3:1), high pressure homogenization (50 MPa, 3 cycles) was performed to prepare a nanoemulsion with a particle size of ≤120 nm.

[0040] Preferably, the preparation of the utilitarian fruit oil in step 3 comprises the following steps:

[0041] Step 31: Select the thorn apple seeds from the Haba Snow Mountain production area at an altitude of more than 2,300 meters. After mechanical shelling, use a color sorter to remove moldy and damaged seeds, leaving intact kernels.

[0042] Step 32: supercritical CO2 extraction, parameter settings: temperature 40°C, pressure 35 MPa, time 120 min, CO2 flow rate 25 L / h;

[0043] Step 33: Use low-temperature screw pressing, the temperature is ≤50℃, and then use a filter to remove impurities;

[0044] Step 34: low temperature and high pressure homogenization (40°C, 15 MPa) to reduce the oil droplet size to ≤100 nm;

[0045] Step 35: Polysorbate 80 (0.5%) was added as an emulsifier to prevent the oil phase from separating out.

[0046] Preferably, the preparation of the Panax notoginseng root extract in step 3 specifically comprises the following steps:

[0047] Step 301: selecting the taproot of three-year-old Panax notoginseng grown in Wenshan, Yunnan, rinsing it with ozone water for 10 minutes, and then sterilizing it by ultraviolet irradiation (254 nm, 30 min), and controlling the moisture content to be below 10%;

[0048] Step 302: After quick freezing in liquid nitrogen, ultrafine grinding is performed to 200 mesh (particle size ≤ 75 μm) to prevent oxidation and degradation of saponin components;

[0049] Step 303: Panax notoginseng powder and purified water are mixed at a ratio of 1:12, cellulase (0.3%) and β-glucanase (0.2%) are added, and enzymatic hydrolysis is carried out at 50°C for 2 hours. After enzymatic hydrolysis, the temperature is quickly raised to 90°C for inactivation and maintained for 15 minutes;

[0050] Step 304: Centrifuge (6000 rpm, 25 minutes) to separate the solid and liquid phases, and combine the three extracts;

[0051] Step 305: Low-temperature vacuum concentration, temperature ≤ 45°C, vacuum degree -0.08 MPa, to concentrate to a solid content ≥ 30%.

[0052] Preferably, the solution is completely dissolved in step 1, with a rotation speed of 300 rpm and a time of 10 min.

[0053] Preferably, in step 3, the utilitarian fruit oil, Panax notoginseng root extract (lipid-soluble carrier) and polysorbate 80 (0.5%) are mixed at a pressure of 15 MPa for 5 minutes.

[0054] Preferably, in step 5, the rotation speed of the high shear emulsifier is 8000 rpm, and the time is 15 minutes to form a primary emulsion.

[0055] (3) Beneficial effects

[0056] Compared with the prior art, the present invention provides a whitening essence suitable for sensitive skin and a preparation method thereof, which has the following beneficial effects:

[0057] 1. This whitening essence suitable for sensitive skin and its preparation method adopts a synergistic combination of prickle fruit oil (barrier repair), purslane (anti-inflammatory), Yunnan camellia (tyrosinase inhibition) and Panax notoginseng (improving microcirculation) to inhibit melanin production through multiple pathways and simultaneously soothe sensitive skin.

[0058] 2. This whitening essence suitable for sensitive skin and its preparation method, by compounding niacinamide (3%) with prickle oil, enhances the synergy of whitening and barrier repair through the dual mechanisms of promoting ceramide synthesis and inhibiting melanin transport.

[0059] 3. The whitening essence suitable for sensitive skin and its preparation method have better active ingredient retention effect through supercritical CO2 extraction of prickle fruit polysaccharide (retention rate ≥95%) and low-temperature membrane separation of purslane total flavonoids (retention rate 92%). DETAILED DESCRIPTION

[0060] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0061] A whitening essence suitable for sensitive skin, composed of the following components in percentage:

[0062] Prinus purpurogenum oil 2%-3%

[0063] Portulaca oleracea extract 1%-2%

[0064] Camellia sinensis extract 1.5%

[0065] Panax notoginseng root extract 0.5%

[0066] Niacinamide ≤3%

[0067] 1,2-Hexanediol 1%-1.5%

[0068] Sodium hyaluronate 0.1%-0.3%

[0069] Deionized water 60%-70%.

[0070] Example 1

[0071] The preparation method of the whitening essence comprises the following steps:

[0072] Step 1: Heat deionized water (60%-70%) to 75°C, add sodium hyaluronate and 1,2-hexanediol, and stir until completely dissolved;

[0073] In addition, the solution was completely dissolved in step 1, the speed was 300 rpm, and the time was 10 min.

[0074] Step 2: Cool to 50°C, add purslane extract and Camellia sinensis extract, and maintain low-speed stirring to generate phase A;

[0075] Step 3: Mix the utilitarian fruit oil, Panax notoginseng root extract (lipid-soluble carrier) and polysorbate 80 (0.5%), and heat to 40° C. for homogenization;

[0076] In addition, in the step 3, the utilitarian fruit oil, the Panax notoginseng root extract (a fat-soluble carrier) and polysorbate 80 (0.5%) are mixed at a pressure of 15 MPa for 5 minutes.

[0077] Step 4: Add the niacinamide pre-dispersion moistened with propylene glycol to form phase B;

[0078] Step 5: Slowly add phase B to phase A, maintain a constant temperature of 50°C, and use a high shear emulsifier to form a primary emulsion;

[0079] In addition, in step 5, the rotation speed of the high shear emulsifier is 8000 rpm, and the time is 15 minutes to form a primary emulsion.

[0080] Step 6: Gradual cooling to 40°C, adding pH adjuster (citric acid / sodium citrate) to control the pH in the range of 5.0-5.5;

[0081] Step 7: Filter through a 0.22 μm microporous filter membrane to remove impurities and use disposable sterile vacuum packaging.

[0082] In this embodiment, a synergistic combination of prickle fruit oil (barrier repair), purslane (anti-inflammatory), camellia sinensis (tyrosinase inhibition) and Panax notoginseng (microcirculation improvement) is used to inhibit melanin production through multiple pathways and simultaneously soothe sensitive skin.

[0083] Example 2

[0084] The method for preparing the purslane extract in step 2 further comprises the following steps:

[0085] Step 21: Rinse the fresh purslane whole herb with ozone water for 5 minutes to remove surface microorganisms and impurities;

[0086] Step 22: Drain and air dry at room temperature to avoid high temperatures destroying the active ingredients;

[0087] Step 23: Grinding the dried purslane into 80-100 mesh fine powder with a particle size of ≤150 μm using a jet mill;

[0088] Step 24: Mix purslane powder and purified water at a ratio of 1:10, add cellulase (0.2%) and pectinase (0.1%), and perform enzymatic hydrolysis at 40° C. for 2 hours (to release flavonoids in the cell wall);

[0089] Step 25: After enzymatic hydrolysis, the temperature was raised to 90°C to inactivate the enzymes and maintained for 30 minutes;

[0090] Step 26: Separate and concentrate the product through a microfiltration membrane (0.45 μm) and a nanofiltration membrane (500 Da), with a molecular weight cutoff of 1000-5000 Da.

[0091] Step 27: vacuum low-temperature concentration: temperature ≤ 45°C, vacuum degree -0.08 MPa, to a concentrate with a solid content of 30%.

[0092] In this embodiment, compared with traditional hot water extraction, the total flavonoid extraction rate is increased by 35%, the time is shortened by 50%, and the use of organic solvents such as petroleum ether is avoided, thereby reducing the risk of irritation.

[0093] Example 3

[0094] The specific preparation of the Camellia yunnanensis extract in step 2 includes the following steps:

[0095] Step 201: Select fresh Yunnan camellia petals from high altitude areas, wash them with ozone water spray for 3 minutes, and then dry them with cold air (temperature ≤ 35° C., humidity ≤ 40%).

[0096] Step 202: Grinding to 60-80 mesh (particle size ≤ 250 μm) using a low-temperature airflow mill;

[0097] Step 203: petal powder and pure water are mixed at a ratio of 1:15, β-glucanase (0.3%) and cellulase (0.1%) are added, and enzymatic hydrolysis is carried out at 45° C. for 1.5 hours to destroy the cell wall structure;

[0098] Step 204: using 50% ethanol as the solvent, ultrasonically extracting at a power of 200 W and a frequency of 40 kHz for 30 minutes, centrifuging (5000 rpm, 20 minutes) to separate the solid and liquid phases, and collecting the supernatant;

[0099] Step 205: Concentrating temperature ≤ 40°C, vacuum degree -0.07 MPa, evaporating water to a solid content ≥ 25%;

[0100] Step 206: Using liposomes as carriers (phosphatidylcholine: cholesterol = 3:1), high pressure homogenization (50 MPa, 3 cycles) was performed to prepare a nanoemulsion with a particle size of ≤120 nm.

[0101] Example 4

[0102] The preparation of the utilitarian fruit oil in step 3 comprises the following steps:

[0103] Step 31: Select the thorn apple seeds from the Haba Snow Mountain production area at an altitude of more than 2,300 meters. After mechanical shelling, use a color sorter to remove moldy and damaged seeds, leaving intact kernels.

[0104] Step 32: supercritical CO2 extraction, parameter settings: temperature 40°C, pressure 35 MPa, time 120 min, CO2 flow rate 25 L / h;

[0105] Step 33: Use low-temperature screw pressing, the temperature is ≤50℃, and then use a filter to remove impurities;

[0106] Step 34: low temperature and high pressure homogenization (40°C, 15 MPa) to reduce the oil droplet size to ≤100 nm;

[0107] Step 35: Polysorbate 80 (0.5%) was added as an emulsifier to prevent the oil phase from separating out.

[0108] Example 5

[0109] The preparation of the Panax notoginseng root extract in step 3 specifically comprises the following steps:

[0110] Step 301: selecting the taproot of three-year-old Panax notoginseng grown in Wenshan, Yunnan, rinsing it with ozone water for 10 minutes, and then sterilizing it by ultraviolet irradiation (254 nm, 30 min), and controlling the moisture content to be below 10%;

[0111] Step 302: After quick freezing in liquid nitrogen, ultrafine grinding is performed to 200 mesh (particle size ≤ 75 μm) to prevent oxidation and degradation of saponin components;

[0112] Step 303: Panax notoginseng powder and purified water are mixed at a ratio of 1:12, cellulase (0.3%) and β-glucanase (0.2%) are added, and enzymatic hydrolysis is carried out at 50°C for 2 hours. After enzymatic hydrolysis, the temperature is quickly raised to 90°C for inactivation and maintained for 15 minutes;

[0113] Step 304: Centrifuge (6000 rpm, 25 minutes) to separate the solid and liquid phases, and combine the three extracts;

[0114] Step 305: Low-temperature vacuum concentration, temperature ≤ 45°C, vacuum degree -0.08 MPa, to concentrate to a solid content ≥ 30%.

[0115] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0116] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A whitening essence suitable for sensitive skin, characterized by: It is composed of the following mass percentages: Prinus purpurogenum oil 2%-3% Portulaca oleracea extract 1%-2% Camellia sinensis extract 1.5% Panax notoginseng root extract 0.5% Niacinamide ≤3% 1,2-Hexanediol 1%-1.5% Sodium hyaluronate 0.1%-0.3% Deionized water 60%-70%.

2. A method for preparing a whitening essence suitable for sensitive skin, comprising the whitening essence suitable for sensitive skin and the preparation method thereof according to claim 1, characterized in that: The preparation method of the whitening essence comprises the following steps: Step 1: Heat deionized water (60%-70%) to 75°C, add sodium hyaluronate and 1,2-hexanediol, and stir until completely dissolved; Step 2: Cool to 50°C, add purslane extract and Camellia sinensis extract, and maintain low-speed stirring to generate phase A; Step 3: Mix the utilitarian fruit oil, Panax notoginseng root extract (lipid-soluble carrier) and polysorbate 80 (0.5%), and heat to 40° C. for homogenization; Step 4: Add the niacinamide pre-dispersion moistened with propylene glycol to form phase B; Step 5: Slowly add phase B to phase A, maintain a constant temperature of 50°C, and use a high shear emulsifier to form a primary emulsion; Step 6: Gradual cooling to 40°C, adding pH adjuster (citric acid / sodium citrate) to control the pH in the range of 5.0-5.5; Step 7: Filter through a 0.22 μm microporous filter membrane to remove impurities and use disposable sterile vacuum packaging.

3. The method for preparing a whitening essence suitable for sensitive skin according to claim 2, wherein: The method for preparing the purslane extract in step 2 further comprises the following steps: Step 21: Rinse the fresh purslane whole herb with ozone water for 5 minutes to remove surface microorganisms and impurities; Step 22: Drain and air dry at room temperature to avoid high temperatures destroying the active ingredients; Step 23: Grinding the dried purslane into 80-100 mesh fine powder with a particle size of ≤150 μm using a jet mill; Step 24: Mix purslane powder and purified water at a ratio of 1:10, add cellulase (0.2%) and pectinase (0.1%), and perform enzymatic hydrolysis at 40° C. for 2 hours (to release flavonoids in the cell wall); Step 25: After enzymatic hydrolysis, the temperature was raised to 90°C to inactivate the enzymes and maintained for 30 minutes; Step 26: Separate and concentrate the product through a microfiltration membrane (0.45 μm) and a nanofiltration membrane (500 Da), with a molecular weight cutoff of 1000-5000 Da. Step 27: vacuum low-temperature concentration: temperature ≤ 45°C, vacuum degree -0.08 MPa, to a concentrate with a solid content of 30%.

4. The method for preparing a whitening essence suitable for sensitive skin according to claim 2, wherein: The specific preparation of the Camellia yunnanensis extract in step 2 includes the following steps: Step 201: Select fresh Yunnan camellia petals from high altitude areas, wash them with ozone water spray for 3 minutes, and then dry them with cold air (temperature ≤ 35° C., humidity ≤ 40%). Step 202: Grinding to 60-80 mesh (particle size ≤ 250 μm) using a low-temperature airflow mill; Step 203: petal powder and pure water are mixed at a ratio of 1:15, β-glucanase (0.3%) and cellulase (0.1%) are added, and enzymatic hydrolysis is carried out at 45° C. for 1.5 hours to destroy the cell wall structure; Step 204: using 50% ethanol as the solvent, ultrasonically extracting at a power of 200 W and a frequency of 40 kHz for 30 minutes, centrifuging (5000 rpm, 20 minutes) to separate the solid and liquid phases, and collecting the supernatant; Step 205: Concentrating temperature ≤ 40°C, vacuum degree -0.07 MPa, evaporating water to a solid content ≥ 25%; Step 206: Using liposomes as carriers (phosphatidylcholine: cholesterol = 3:1), high pressure homogenization (50 MPa, 3 cycles) was performed to prepare a nanoemulsion with a particle size of ≤120 nm.

5. The method for preparing a whitening essence suitable for sensitive skin according to claim 2, wherein: The preparation of the utilitarian fruit oil in step 3 comprises the following steps: Step 31: Select the thorn apple seeds from the Haba Snow Mountain production area at an altitude of more than 2,300 meters. After mechanical shelling, use a color sorter to remove moldy and damaged seeds, leaving intact kernels. Step 32: supercritical CO2 extraction, parameter settings: temperature 40°C, pressure 35 MPa, time 120 min, CO2 flow rate 25 L / h; Step 33: Use low-temperature screw pressing, the temperature is ≤50℃, and then use a filter to remove impurities; Step 34: low temperature and high pressure homogenization (40°C, 15 MPa) to reduce the oil droplet size to ≤100 nm; Step 35: Polysorbate 80 (0.5%) was added as an emulsifier to prevent the oil phase from separating out.

6. The method for preparing a whitening essence suitable for sensitive skin according to claim 2, wherein: The preparation of the Panax notoginseng root extract in step 3 specifically comprises the following steps: Step 301: selecting the taproot of three-year-old Panax notoginseng grown in Wenshan, Yunnan, rinsing it with ozone water for 10 minutes, and then sterilizing it by ultraviolet irradiation (254 nm, 30 min), and controlling the moisture content to below 10%; Step 302: After quick freezing in liquid nitrogen, ultrafine grinding is performed to 200 mesh (particle size ≤ 75 μm) to prevent oxidative degradation of saponin components; Step 303: Panax notoginseng powder and purified water are mixed at a ratio of 1:12, cellulase (0.3%) and β-glucanase (0.2%) are added, and enzymatic hydrolysis is carried out at 50°C for 2 hours. After enzymatic hydrolysis, the temperature is quickly raised to 90°C for inactivation and maintained for 15 minutes; Step 304: Centrifuge (6000 rpm, 25 minutes) to separate the solid and liquid phases, and combine the three extracts; Step 305: Low-temperature vacuum concentration, temperature ≤ 45°C, vacuum degree -0.08 MPa, to concentrate to a solid content ≥ 30%.

7. The method for preparing a whitening essence suitable for sensitive skin according to claim 2, characterized in that: The mixture was completely dissolved in step 1, with a rotation speed of 300 rpm and a time of 10 min.

8. The method for preparing a whitening essence suitable for sensitive skin according to claim 2, wherein: In the step 3, the utilitarian fruit oil, the notoginseng root extract (a fat-soluble carrier) and polysorbate 80 (0.5%) are mixed at a pressure of 15 MPa for 5 minutes.

9. The method for preparing a whitening essence suitable for sensitive skin according to claim 2, wherein: In the step 5, the rotation speed of the high shear emulsifier is 8000 rpm, and the time is 15 minutes to form a primary emulsion.