CN106645143A - Body testing method for sun-screening performance of product containing sun-screening agents - Google Patents
Body testing method for sun-screening performance of product containing sun-screening agents Download PDFInfo
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- CN106645143A CN106645143A CN201610865124.5A CN201610865124A CN106645143A CN 106645143 A CN106645143 A CN 106645143A CN 201610865124 A CN201610865124 A CN 201610865124A CN 106645143 A CN106645143 A CN 106645143A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
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Abstract
The invention relates to a testing method for the sun-screening performance of sun-screening agents, and particularly discloses a testing method for the sun-screening performance of a cosmetic product containing the sun-screening agents. The testing method includes the steps: (i) performing ultraviolet photography for a body skin area to be tested, and reading light intensity data alpha 0 of the area on an ultraviolet photo; (ii) coating the body skin with the product containing the sun-screening agents to be tested to form a coated area; (iii) performing ultraviolet photography for the coated area and reading light intensity data alpha 1 of the area on the ultraviolet photo; (iv) calculating the strength change rate delta of the coated area according to the following formula: delta=(alpha 0-alpha 1)/alpha 0. The strength change rate serves as the sun-screening performance of the product containing the sun-screening agents.
Description
Technical field
The present invention relates to a kind of method of testing containing the sun-proof performance of sunscreen products.The inventive method is determined containing anti-quick
It is avoided that test subject skin is injured by ultraviolet while shining agent product sun-proof performance.
Background technology
In sunlight in addition to visible ray, there is also about 1% wavelength can be irradiated to the earth in the ultraviolet of 280～400nm
Surface.Ultraviolet is divided into 3 wave bands, wherein skin is had damage predominantly UVA (320～400nm) and UVB (280～
320nm).Skin is chronically exposed under ultraviolet, can cause photoaging；The ultraviolet irradiation of short-term high intensity can result in skin
Skin acute injury, wherein UVB can mainly cause the generation of erythema, and UVA mainly results in skin melanism.In order to protecting skin from
The injury of daylight middle-ultraviolet lamp, the product with sun-screening function is increasingly becoming one of staple product of cosmetic industry, common
Including sunscreen product, day cream class product and with the BB frosts and CC frosts etc. for hiding the flaw, repairing face function.
Country《Cosmetics health specification》(2007 editions) define and test the sun-proof of sunscreen products using human body Evaluation Method
Performance, it characterizes the sun-proof performance of sunscreen product with spf value and PFA values.Wherein, spf value is defined as：It is anti-using sun care preparationss
The minimum erythema dose MED (the minimum exposure dose of erythema or most short irradiation time occurs in skin) of sheath skin is sun-proof with unused
The ratio of the minimum erythema dose MED of cosmetic skin, it is clear that spf value is bigger, then damage energy of the product anti-ultraviolet to skin
Power is bigger.PFA values are defined as：Prevented with being not used using the MPPD (minimal persistent pigment dose) of sun care preparationss protecting skin
Shine the ratio of the minimal persistent pigment dose MPPD of cosmetic skin, it is clear that PFA values are bigger, then product anti-ultraviolet is to skin
Lesion capability is bigger.
There is certain and defect using human body Evaluation Method.For example, " the cosmetics sun-proof result test side of Cheng Yan etc.
Method is analyzed and compared " (《Household chemicalss science》, in July, 2008, the 7th phase of volume 31) refer to SPF human test's methods.Its is excellent
Point is the actual sun-proof result that can scientifically reflect product, widely by such as U.S., Germany, Australia and Japan and other countries
Adopt.The major defect of SPF human body methods is that occidentals and yellow have differences to day photoreactivity：Erythematous response is white to America and Europe
Plant with universality and directly perceived for people, after the ultraviolet irradiation in by sunlight, the American-European white skin of major part
Acute erythematous response can be produced or even burnt.But to the relatively deep yellow of the colour of skin and Black people, skin is exposed to sunlight
Lower produced main effects is not mostly erythema, for Black people, even long-time is exposed to the sun may not produce erythema yet.
To overcome the defect of existing human body Evaluation Method, teach that in vitro method is entered to the sun-proof performance of sunscreen product
Row test.For example, Yang Li Lignum Rhamnellae the physical method of the sun-proof performance of sun-proof articless " test " (《Inner Mongol Normal University's journal (from
Right science Chinese version)》, in March, 2006, the 1st phase of volume 35) disclose a kind of sunscreen products sun-proof performance test side
Method, it is coated in sunscreen products in quartzy plate surface, and the product is subsequently tested in dual-beam ultraviolet-visible spectrophotometer
The uv transmittance of product.
Compared with human body Evaluation Method, in vitro method fast power-saving, cost are low, reproducible, but in vitro method also receives many factors
Impact such as：The factor such as contained particle diameter of powder in smearing method, film forming characteristicss, the dosage form of product itself, the product of product.
In addition, the anti-of rear easily film forming is smeared made by the ultraviolet absorber that species is identical but addition is different for adding in similar formula
For shining frost, in vitro method is in preferable linear relationship.But the defect of its maximum is have ignored using skin after sun care preparationss
Reaction, it is impossible to its actual sun-proof result of accurate evaluation and the side effect being likely to occur.
Prior art attempts to be associated in vitro method with human body Evaluation Method, so as to pass through the data of correction coefficient in vitro method
To characterize the result of human body Evaluation Method measure.For example, " the sun care preparationss UVA protection effects testing in vitro and human body of Suning etc.
Test result compares " (《Fragrance flavor and cosmetic》, phase April the 2nd in 2016) and adopt in vitro method with human trial to cosmetics
UVA barrier propterties are evaluated, and investigate the dependency of two methods test result.As a result show, testing in vitro result and people
Body method test result has good dependency.But this relatedness is limited only to UVA wave bands, it is not mentioned for UVB
Whether the ultraviolet of wave band, testing in vitro result still can have good dependency with human body method test result.
Ultraviolet reflectance photography is usually used in criminal investigation field, for for example extracting the sweat fingerprint of body surface.Ba Xi etc. is in " number
Code-phase machine-long wave ultraviolet line reflection camera work research " (《Criminal policeman's technology》, see Hownet) text by ultraviolet reflectance photography define
For：Ultraviolet reflectance photography to be referred to and be examined object with ultraviolet irradiation, using difference of the material to reflection and the absorption of ultraviolet
To improve the luminance difference of vestige and carrier, a kind of camera work of the distribution of object uv reflectance is recorded on the photosensitive material.
Therefore, it is still necessary to develop a kind of method of testing containing the sun-proof performance of sunscreen products, it is desirable to which the method for testing is pressed close to
Human body Evaluation Method, but must be quick, little and with low cost to the damage of human body skin.
The content of the invention
Therefore, a goal of the invention of the invention is to provide a kind of human test side containing the sun-proof performance of sunscreen products
Method, the method for testing employment is estimated as experimenter, and with quick, little to the damage of human body skin and low cost
Honest and clean advantage.
Therefore, the present invention provides a kind of cosmetically method of testing containing the sun-proof performance of sunscreen products, and it includes following step
Suddenly：
(i) to will the human body skin area of tested person carry out uv photography and read the light intensity in the region in ultraviolet picture
Degrees of data a0；
(ii) sunscreen products of tested person are coated on the human body skin, form coating area；
(iii) uv photography is carried out to coating area and reads the light intensity data a in the region in ultraviolet picture1；With
(iv) coating area intensity rate of change Δ is calculated according to following equation, as the sun-proof performance of sunscreen products：
Δ=(a0-a1)/a0。
Description of the drawings
The present invention is further illustrated below in conjunction with the accompanying drawings, in accompanying drawing：
Fig. 1 is the method for testing flow chart of a preferable example of the invention；
Fig. 2 is the graph of a relation of coated weight and ultraviolet picture light intensity rate of change in an example of the invention；
Fig. 3 is the corresponding relation between traditional synthesis SPF (sun protection factor) and the inventive method light intensity rate of change.
Specific embodiment
The present invention provides a kind of cosmetically method of testing containing the sun-proof performance of sunscreen products.Suitable for the inventive method
Can be cosmetically any cosmetics and skincare product containing sunscreen or with sun-proof anti-ultraviolet function containing sunscreen products, its
Not limiting example has, such as sunscreen cream, suntan lotion, sunlight lotion, sunscreen, day cream/morning frost, BB frosts, CC frosts, sun screen etc.
Deng.
The present invention adopts method evaluation sun-proof performance containing sunscreen products of uv photography.Uv photography method is in itself known
's.Such as Ba Xi etc. " digital camera-long wave ultraviolet line reflection camera work research " (《Criminal policeman's technology》, see Hownet) and a text carries
To ultraviolet reflectance method for imaging.The inventors found that can adopt ultraviolet reflectance method for imaging to evaluate the anti-of sunscreen products
Performance is shone, and the result for finally giving has identical variation tendency with the human body Evaluation Method of routine.The present invention is exactly at this
It was found that on the basis of complete.
The inventive method include to will the human body skin area of tested person enter line blank uv photography.Selected is received
Test human body skin requirement with《Cosmetics health specification》(2007) requirement phase of the human body Evaluation Method to human body skin area in
Together, i.e., requirement is 18-60 year health man or female's trial volunteer, the past is unglazed perceptual history of disease and unused impact at no distant date
Photosensitive medicine, the skin of recipient site answers non-pigment calmness, inflammation, cicatrix, nevus cell nevuss, hirsutism etc., gestation, suckling, mouth
Clothes or the anti-inflammatory drug such as external corticosteroid hormone or it is nearly one month in once received to be similar to experimenter exclude experimenter it
Outward.
Using uv photography method be known uv photography method, such as Ba Xi etc. is " digital camera-long wave ultraviolet is anti-
Penetrate camera work research " (《Criminal policeman's technology》, see Hownet) and a text mentions ultraviolet reflectance method for imaging etc..Uv photography equipment can
Buy from the market, such as purchased from the VISIA-CR uv photography equipment of Canfield companies of the U.S..
To avoid impact of the ambient ultraviolet line to degree of accuracy of taking a picture, in an example of the present invention, the uv photography
Carry out in darkroom.
Ultraviolet wavelength in uv photography for irradiating tested skin area is the Conventional UV optical wavelength of this area.
In an example of the present invention, a length of 200-400nm of ultraviolet light wave for irradiating tested skin area (is covered from short wave ultraviolet
The all wavelengths of (UVC) to long wave ultraviolet (UVA)).In another example of the invention, the ultraviolet of tested skin area is irradiated
A length of 290nm～the 320nm of light wave is ultraviolet B radiation (UVB).Tested skin area is irradiated in another example of the invention
A length of 320nm～the 400nm of ultraviolet light wave is long wave ultraviolet (UVA).
After the ultraviolet photograph for obtaining tested skin area, light intensity value a in tested region is read by the photo0.Read
Photo light intensity value a0Method it is without particular limitation, can be known method.In an example of the present invention, adopt and divide
Photo light intensity value a0 is read in analysis measurement image software Imagepro-Plus (IPP softwares).
The inventive method includes to the sunscreen products of tested person are coated on the human body skin, forms coating area.Apply
The area and applying amount for covering area is without particular limitation, can be conventional coated area known in the art and applying amount.At this
In a bright example, the coated area and applying amount meet《Cosmetics health specification》(2007) requirement.In the present invention
An example in, the coated area be 3-20cm2, preferably 6-12cm2, more preferably 8-10cm2.In the another of the present invention
In individual example, the applying amount is 0.25-3mg/cm2, preferably 0.375-2.5mg/cm2, preferred 0.5-2mg/cm2.At this
In another bright example, the applying amount is 0.1-0.6mg/cm2, preferable 0.15-0.5mg/cm2。
In an example of the present invention, sample is spread evenly across the skin region of tested person using latex finger cot, subsequently
10-20 minutes are waited, preferably etc. 12-18 minutes, carry out ultraviolet light photograph within preferably 15 minutes.
The condition and equipment and the human body skin area to wanting tested person noted earlier of ultraviolet light photograph are carried out to coating area
The condition for entering line blank uv photography is identical with equipment.Analysis of the image software, such as IPP softwares is used to read the ultraviolet photograph
Light intensity value a of piece1。
In the present invention, term " photo " and " image " are used interchangeably, and refer to the photo or image of the acquisition of uv photography method.
In the present invention, term " brightness " and " light intensity " are used interchangeably, refer to photograph software such as IPP softwares from
The brightness or light intensity of the specific region that ultraviolet image is obtained.
Finally, coating area change rate of strength Δ is calculated with following formula, as the sun-proof performance of sunscreen products：
Δ=(a0-a1)/a0。
In a preferable example of the present invention, the method for testing of the sun-proof performance of sunscreen of the present invention comprises the steps：
Described point is carried out to tested person position, the skin image at the position is gathered, with VISIA-CR photographic systems (U.S. Canfield
Company) experimenter is taken pictures in darkroom.Then the product containing sunscreen is smeared at described point position, according to the method in above-mentioned steps
Collection coating position skin image.Region to be analyzed is set, rectangular area is intercepted in the range of described point, using IPP computed in software
Average luminance, according to using the average luminance before and after product rate of change of brightness Δ is calculated.
Fig. 1 is the schematic diagram of a preferable example of the inventive method, and two, left side photo is the handss before smearing in accompanying drawing
Arm photo, two, the right photo are the arm photos after smearing；The method comprises the steps：Described point is carried out to arm part position
(as shown in the white box of upper left corner photo), collection arm position skin image (as shown in the photo of the lower left corner) is used
VISIA-CR photographic systems (Canfield companies of the U.S.) are taken pictures to experimenter, and image capture conditions arrange as follows：Light source mode
For UV-NF, optical filter is standard, and ISO is 250, and aperture is F9, and white balance is daylight, and shooting is carried out in darkroom, it is to avoid ambient light
Line is disturbed, and the image in the upper left corner is the arm image obtained under this light conditions.
The product containing sunscreen is smeared at described point position, subsequently according to above-mentioned steps collection arm position skin image (such as
Shown in the photo of the upper right corner).
Region to be analyzed is set, in the range of described point rectangular area (as shown in the photo of the lower right corner) is intercepted, such as in the middle of left and right
Image shown in.IPP computed in software average luminances are subsequently adopted, rate of change of brightness Δ is calculated to obtain.
The image analytical method of the present invention, using before and after the product for containing sunscreen, is irradiated based on human body skin with ultraviolet
Make the change of its light intensity and set up, in this process ultraviolet is time of contact short with skin, does not result in skin injury, tested
Person is repeatable to be utilized, therefore can be greatly improved containing sunscreen product in terms of time, expense, experimenter's selection and degree of injury four
The sun-proof Performance Evaluation efficiency of product.
Additionally, such as Cheng Yan " cosmetics sun-proof result analysis of test methods with compare " (《Household chemicalss science》,
In July, 2008, the 7th phase of volume 31) it is described, the evaluation methodology of existing sunscreen product human body sun-proof result is based on the skin of occidentals
Skin, and in vitro method has completely disengaged from the comprehensive change of physiological statuss of the human body skin under product coating, so needing to build
Vertical suitable Chinese Skin, accurately believable sunscreen product sun-proof result evaluation methodology.Result that the inventive method is obtained with
The spf value and PFA values for representing the protection effect to UVB and UVA respectively has relatedness, and not by ethnic group and the shadow of the colour of skin
Ring, be that the sun-proof result evaluation methodology for providing suitable yellow lays the foundation.
Further detailed description is done to the present invention with reference to embodiment and accompanying drawing, but embodiments of the present invention are not limited
In this.
Embodiment 1
Relation between test applying amount and the change of ultraviolet picture light intensity
1) described point, collection arm position skin image, with the VISIA-CR photographic systems (U.S. are carried out to arm part position
Canfield companies) position of experimenter to be taken pictures, image capture conditions arrange as follows：Light source mode is UV-NF, is filtered
Piece is standard, and ISO is 250, and aperture is F9, and white balance is daylight, and shooting is carried out in darkroom, it is to avoid ambient is disturbed.As a result
As shown in the image in Fig. 1 upper left corners.
2) (the new clear maintenance of herborist is sun-proof the product containing sunscreen to be smeared with the applying amount for specifying at above-mentioned described point position
Liquid, purchased from Shanghai Jia Hua limited companies, SPF30+；PA+++), subsequently according to above-mentioned steps collection arm area skin figure
Picture, as a result as shown in the photo of Fig. 1 upper right corner.
3) region to be analyzed is set, rectangular area is intercepted in the range of described point, as a result such as the image institute in the middle of Fig. 1 or so
Show.
4) using the average luminous intensity in area to be analyzed described in IPP computed in software：Step 1) gained image average luminous intensity
It is designated as a0, step 2) gained image average luminous intensity be designated as a1.Intensity rate of change Δ is calculated to obtain with following formula：
Δ=(a0-a1)/a0。
5) applying amount is changed to obtain corresponding intensity rate of change, by a series of corresponding light of different applying amounts
Change rate of strength is mapped, and as a result as shown in Figure 2 (its x-axis is applying amount (mg/cm2), y-axis be light intensity rate of change.
The sun-proof performance that sunscreen product is assessed in traditional people's body method is typically chosen 2mg/cm2As applying amount, I
The light intensity situation of change (Fig. 2) that causes of relatively more different amounts of sunscreen product, find in 0～0.5mg/cm2In the range of applying amount
Applying amount is linear with light intensity rate of change, 0.5～2mg/cm2With the increase of applying amount, the increase width of light intensity rate of change
Degree tends towards stability.Therefore in the methods of the invention preferably using flex point 0.5mg/cm between two sections2As test volume.
Embodiment 2
The present embodiment is mainly introduced to carry out being produced containing sunscreen with the inventive method to 25 years old healthy women experimenter
The appraisal procedure and program of the sun-proof performance of product
1. volunteer chooses：1 25 years old healthy women experimenter is chosen, handss front side arm position sinks without obvious cicatrix, pigment
, and require the whiter person of the colour of skin；
2. pair arm part position carries out described point, gathers arm position skin image, and with VISIA-CR, (U.S. Canfield is public
Department) experimenter to be taken pictures, image capture conditions arrange as follows：Light source mode is UV-NF, and optical filter is standard, and ISO is 250, light
Enclose as F9, white balance is daylight, shooting is carried out in darkroom, it is to avoid ambient is disturbed；
3. product (the new clear maintenance suntan lotion of herborist, purchased from Shanghai man stock containing sunscreen is smeared at described point position
Part company limited, SPF30+；PA+++), area is 2 × 4cm2；Applying amount is 0.5mg/cm2；After spread product, according to step
1) method in gathers again arm position skin image；
4. region to be analyzed is set, is intercepted in the range of described point and is less than 2 × 4cm2Rectangular area, using IPP softwares
Average luminous intensity is calculated, as a result meansigma methodss are respectively 129 and 41, and counted Δ value is 68.22%.
Embodiment 3
The present embodiment is assessed in batches one group of experimenter using the method for embodiment 2 and is containing sunscreen using variety classes
Product (morning frost, CC frosts, sunlight lotion) and using product (common skin cream) its light intensity situation of change afterwards without sunscreen, demonstration
The feasibility of method.
1) volunteer chooses：12 25～55 years old healthy women experimenters are chosen, handss front side arm position is without obvious cicatrix, color
It is plain calm, and require the whiter person of the colour of skin.
2) described point and packet：Handss front side arm position carries out described point and packet, and every group of described point area is 2 × 4cm2, experiment is altogether
Divide 5 groups：Blank control group (not smearing any sample), morning frost group (smear the frost of the morning containing sunscreen, herborist high-end whitening morning
Frost, purchased from Shanghai Fine Chemical Co., Ltd, SPF15；PA+), CC frosts group (smears the CC containing sunscreen white, Estee Lauder
It is fresh support it is shining it is bright repair Yan Shuan, purchased from Estee Lauder commerce and trade company limited, SPF20；PA+), sunlight lotion (is smeared containing the sun-proof of sunscreen
Dew, An Resha sunlight lotions, purchased from Shiseido China, SPF50+；PA++++), common skin cream (is smeared without the common of sunscreen
Skin cream, shellfish parent's baby moistening dew, purchased from shellfish parent's mother and baby's articles for use (Shanghai) Co., Ltd.).
3) picture collection, intercepting and analysis：Method according to 1-5 steps in embodiment 2 carries out picture and adopts to each group region
Collect, smear respective sample, intercept region to be analyzed, calculate average luminous intensity, wherein amount of samples is 0.5mg/cm2.And calculate
Light intensity rate of change, it is as a result as shown in the table.
Table 1：Different sample sets smear sample forward backward averaging light intensity I and light intensity rate of change (X ± SD；N=12)
* represent and smear rear average luminous intensity relative to having significant difference before smearing
Forward backward averaging light intensity difference is smeared in ▲ representative has significant difference relative to blank group
Forward backward averaging light intensity difference is smeared in representative has significant difference relative to common skin cream group
The average and rate of change of smearing sample forward backward averaging light intensity that table 1 is obtained for different sample sets；It is empty as seen from Table 1
Common skin cream groups of the Bai Zuhe without sunscreen smear after relative to smearing front average light intensity value without significantly changing；And contain
The morning frost of sunscreen, CC frosts and sunlight lotion group are significantly reduced relative to smearing front average light intensity value after smearing, and containing sun-proof
Common skin cream group of this three groups of agent relative to blank group and without sunscreen has significant difference.Thus the method energy is illustrated
The enough difference distinguished between the product containing sunscreen and the product without sunscreen.
Embodiment 4
The present embodiment is assessed in batches one group of experimenter using the method for embodiment 2 and is being referred to using different SPF indexes and PA
After several products, the size of its light intensity rate of change compares light-intensity difference caused by the sunscreen product of different SPF indexes and PA indexes
Situation, proves the concordance of the method and conventional body's appraisal procedure.
1) volunteer chooses：12 25～55 years old healthy women experimenters are chosen, handss front side arm position is without obvious cicatrix, color
It is plain calm and require the whiter person of the colour of skin.
2) described point and packet：Handss front side arm position carries out described point and packet, and every group of described point area is 2*4cm2, experiment is divided into
3 groups：(Maxam brand water moistens moisturizing sunscreen, joins purchased from Shanghai manization for blank control group (not smearing any sample), sunscreen product 1
Close limited company, SPF20；PA++), (the new clear maintenance suntan lotion of herborist, combines sunscreen product 2 purchased from Shanghai manization
Limited company, SPF30+；PA+++)
3) image acquisition, intercepting and analysis：Method according to 1-5 steps in embodiment 2 carries out image and adopts to each group region
Collect, smear respective sample, intercept region to be analyzed, calculate average luminous intensity, wherein amount of samples is 0.5mg/cm2。
4) light intensity rate of change is calculated.
Table 2：Different sun-proof product groups smear sample forward backward averaging light intensity I and light intensity rate of change (X ± SD；N=12)
| Sample is grouped | I (before smearing) | I (after smearing) | Light intensity rate of change |
| Blank group | 83.21±22.45 | 80.65±20.25 | 2.58% ± 6.30% |
| (the SPF20 of sunscreen product 1；PA++) | 86.56±22.31 | 60.08±17.22*▲ | 31.09% ± 5.74% |
| (the SPF30+ of sunscreen product 2；PA+++) | 83.28±22.36 | 47.43±12.86*▲# | 42.65% ± 6.21% |
* represent and smear rear average luminous intensity relative to having significant difference before smearing
Forward backward averaging light intensity difference is smeared in ▲ representative has significant difference relative to blank group
Forward backward averaging light intensity difference is smeared in # representatives has significant difference relative to sunscreen product 1
As a result describe：Table 2 be the sunscreen product of difference SPF indexes and PA indexes smear forward backward averaging light intensity average and
Rate of change.As seen from Table 2 two groups of SPF indexes sunscreen product different with PA indexes is in the difference for smearing forward backward averaging light intensity
There is significant difference between value, SPF indexes and PA indexes are higher, and the average luminous intensity rate of change of this group of sample is also bigger.Show
The difference that conventional body's appraisal procedure is capable of detecting when, the method in the present invention also can be embodied.Method in the present invention with
Conventional body's appraisal procedure has concordance.
Embodiment 5
The present embodiment investigates the quantitative relationship of the inventive method and traditional method：
The present embodiment assesses the product of one group of difference SPF index and PA indexes using the method for embodiment 2, compares its light intensity
The size of rate of change, and SPF indexes and PA indexes are obtained into traditional synthesis SPF (sun protection factor) by assignment, investigate comprehensive SPF (sun protection factor)
With the relation of light intensity rate of change, the quantitative relationship of the inventive method and traditional method is investigated.
Table 3：Testing sample details
| Sample ID | SPF/PA values | Buying source |
| The high-end whitening morning frost of herborist | SPF15/PA+ | Shanghai Fine Chemical Co., Ltd |
| Estee Lauder shines and bright repaiies Yan Shuan | SPF20/PA+ | Estee Lauder commerce and trade company limited |
| Maxam brand water moistens moisturizing sunscreen | SPF20/PA++ | Shanghai Fine Chemical Co., Ltd |
| Sinoway water is full of clear sunlight lotion | SPF30/PA+++ | Shanghai Inoherb Cosmetics Co., Ltd. |
| The new clear maintenance suntan lotion of herborist | SPF30+/PA+++ | Shanghai Fine Chemical Co., Ltd |
SPF indexes and PA exponential valuation methods
SPF assignment methods
Table 4：SPF assignment methods
PA assignment methods
Table 5：PA assignment methods
Traditional synthesis SPF (sun protection factor)=SPF assignment+PA assignment
The light intensity rate of change of above-mentioned each sample is tested and calculated according to the method for embodiment 2, it is as a result as shown in the table：
Table 6：The corresponding relation of traditional synthesis SPF (sun protection factor) and light intensity rate of change
Above-mentioned comprehensive SPF (sun protection factor) and light intensity rate of change of the present invention are mapped, as a result as shown in Figure 3 (x-axis is light intensity change
Rate, y-axis are tradition synthesis SPF (sun protection factor)).
As a result describe：Table 6 is the 5 samples tradition synthesis SPF (sun protection factor) surveyed and the corresponding relation of light intensity rate of change.Fig. 3
Data in table 6 are converted into into figure, and the quantitative pass of traditional synthesis SPF (sun protection factor) and light intensity rate of change is obtained by Trendline
It is formula：Traditional synthesis SPF (sun protection factor)=(y=25.135x-3.6406 of 25.135* light intensity rate of change -3.6406；R2=
0.9794).With the formula as foundation, can predict that the synthesis of sunscreen product is sun-proof using the light intensity rate of change obtained in this method
Index.So as to realize the quantitative conversion of this method and traditional method.
Claims (7)
1. the method for testing of the sun-proof performance of a kind of cosmetically sunscreen products, it comprises the steps：
(i) to will the human body skin area of tested person carry out uv photography and read the light intensity number of degrees in the region in ultraviolet picture
According to a0；
(ii) sunscreen products of tested person are coated on the human body skin, form coating area；
(iii) uv photography is carried out to coating area and reads the light intensity data a in the region in ultraviolet picture1；With
(iv) coating area change rate of strength Δ is calculated according to following equation, as the sun-proof performance of sunscreen products：
Δ=(a0-a1)/a0。
2. the method for claim 1, it is characterised in that for a length of 200-400nm of ultraviolet light wave of ultraviolet light photograph.
3. the method for claim 1, it is characterised in that for ultraviolet light photograph a length of 290nm of ultraviolet light wave～
320nm。
4. the method for claim 1, it is characterised in that for ultraviolet light photograph a length of 320nm of ultraviolet light wave～
400nm。
5. the method as any one of claim 1-4, it is characterised in that the coated area of the coating area is 3-20cm2,
Preferably 6-12cm2, more preferably 8-10cm2。
6. the method as any one of claim 1-4, it is characterised in that the applying amount of the coating area is 0.25-3mg/
cm2, preferably 0.375-2.5mg/cm2, preferred 0.5-2mg/cm2。
7. the method as any one of claim 1-4, it is characterised in that step (ii) is by the sunscreen products of tested person
The skin region of tested person is spread evenly across, 10-20 minutes are then waited for, preferably wait 12-18 minutes, preferably 15 minutes, subsequently
Carry out ultraviolet light photograph.
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