80.Restricted ingredients in cosmetic and skin care products

-
Image
Restricted ingredients in cosmetic and skin care products by regulation. Ingredient Potential toxicity Hexachlorophene Neurotoxic effects Ability to penetrate human skin Mercury compounds Accumulation in the body Skin irritation Allergic reactions Neurotoxicity Bithionol Photocontact sensitization Halogenated salicylanilides Photocontact sensitization Chlorofluorocarbon propellants Hazardous to human health Chloroform Plausible carcinogenicity Vinyl chloride Plausible carcinogenicity Zirconium-containing complexes Lung toxicity Methylene chloride Plausible carcinogenicity help to find the specific skincare product ingredients by "skin+" App.
Post a Comment

38.Skin health_Water content and hydration

-
There are many methods to detect the skin health, skin surface properties, skin color, skin color type, and hair conditions. They are non-intrusive. 
Skin health
Skin health_Water content and hydration
l   Water content and hydration
Stratum corneum water meter
Capacitance
There are two plates in the measurement device which are insulated by a medium that acts as a dielectric.
A capacitor has the capability to store electrical charge when a charged field comes into close proximity
The capacitance is directly proportional to the moisture content of the samples
The higher the moisture is, the higher the capacitance is.
Conductance
This method is according to the changes in the electrical properties of the stratum corneum.
Dry stratum corneum has weak electrical conduction.
The electrical properties of skin are expressed in terms of resistance, conductance (current/resistance), or impedance (ohms at a fixed frequency).
An increase in the dielectric constant leads to a decrease in impedance and increased conductance and capacitance.
It is easily influenced by external factors that act on the stratum corneum.
For example, at high frequencies, it is impossible to measure resistance and capacitance accurately. In addition, at high frequencies, impedance provides information not only on the stratum corneum, but also on the deeper layers of the skin.

Impedance
The difference of above is measurements at different frequencies of the applied alternating current are integrated. The advantage of this method is it allows to select the different electrical impedance by the layers of skin.

Dielectric constant value
15um: epidermis, stratum corneum
30um: epidermis, stratum corneum
2mm  : dermis

-------------------------------------------------------------------------------------------

help to find the specific skincare product ingredients by "skin+" App












Comments

Post a Comment

Popular posts from this blog

80.Restricted ingredients in cosmetic and skin care products

-
Image
Restricted ingredients in cosmetic and skin care products by regulation. Ingredient Potential toxicity Hexachlorophene Neurotoxic effects Ability to penetrate human skin Mercury compounds Accumulation in the body Skin irritation Allergic reactions Neurotoxicity Bithionol Photocontact sensitization Halogenated salicylanilides Photocontact sensitization Chlorofluorocarbon propellants Hazardous to human health Chloroform Plausible carcinogenicity Vinyl chloride Plausible carcinogenicity Zirconium-containing complexes Lung toxicity Methylene chloride Plausible carcinogenicity help to find the specific skincare product ingredients by "skin+" App.
Read more

71.UVA and UVB Sun protection factor

-
Image
UVA andUVB Sun protection factor SPF is Sun Protection Factor. The number is determined experimentally indoors by exposing human subjects to a light spectrum meant to mimic noontime sun.   The SPF number only relates to UVB protection.  UVA is measured by the other definition.  UVA protection is not measured through SPF numbers.  PA is the Japanese measurement of sun protection. It is one of protection grade of UVA  . UVA is based on the Persistent Pigment Darkening (PPD) reaction reading at 2-4 hours of sun exposure.  PA is a protective level of strength to mark the three PA+, PA++ and PA+++. SPF(sun protection factor) Standard: ISO 2444: 2010 cosmetic sun protection test method in vivo determination of SPF (sun protection factor) Test by erythema Minimal dose: MED (minimal erythema dose) Process: exposure to the UV (wave length 290-400nm) Test skin type: type I~ III (ITA 0 >28 0 ) Duration: 16-24hrs after exposure UVA-PF (UVA protection factor)
Read more

79.The roles of Vitamin in skin

-
Image
The roles of Vitamin in skin As we know, the chemical changes induced by exposure to sunlight, we should be able to design a cosmeceutical regime to combat photodamage and reverse its effects. Vitamin molecules are the options and have the functions of metabolism, antioxidant and preventing free radical. 1.       Metabolism Vitamin A controls the conversion of pre–matrix metalloproteinases secreted by keratinocytes and fibroblasts into active matrix metalloproteinases, but with a deficiency of vitamin A, UV irradiation stimulates the unimpaired release of metalloproteinases that then destroy collagen and the anchoring fibrils. Without vitamin A, the rete pegs become flattened. Lang erhans cells need vitamin A to function, but if the vitamin A is inactivated by light, then they cannot function properly and recognize cells whose DNA has been damaged. 2.       Antioxidant Deficiencies of vitamin C permit more free radical damage . The main action of vitamin C is as an
Read more