1/23/2024 0 Comments Nintendo switch oled release dateThey can be applied in small and cost effective concentrations which is an advantage however all of them include an allergenic potential for individuals with a particular disposition.Īs a alternative to the KVO preservatives an adequate concentration of alcohol or moisture-retaining substances as e.g. The preservatives which are currently officially approved are listed in the appendix of the German Cosmetic Decree (KVO). Although W/O emulsions are less susceptible than O/W emulsions due to their external lipid phase there are also mostly preservatives added. A precondition for the efficacy of preservatives is that they adequately dissolve in water on the one hand and have sufficient affinity to the lipid phase as the microorganisms settle on the interfaces of the tiny emulsion drops. Hence, products containing water generally will be preserved. Products containing a aqueous phase are susceptible to microorganisms whereas products free of water practically will not be affected by germs. In combination with moisture-retaining active agents the water content of the products not only increases the skin moisture on a temporary but even on a measurable long-term base. Apart from that water plays an important role as a polar solvent for (hydrophilic) active agents and additives. Our sensory perception recognizes the evaporation of water as a very agreeable cooling effect. when drops of water are included in a lipid phase. Water is an essential ingredient of emulsions and in combination with emulsifiers it contributes to a drop-like dispersion of the lipid substances (O/W emulsions) intended for the skin care and thus substantially facilitates their application on the skin. One of the most frequently used cosmetic additives is water (INCI: aqua) sometimes also called "profitol" with a winking as it definitely is the most profitable additive due to its low raw material cost. They are actually not required for the skin care as such they may even be stressful or counterproductive in this respect but may also have synergetic effects together with other active agents as some examples can prove. consistency, dispersion on the skin, scent (fragrance) and color. They provide the products with their long-term physical stability for transport and storage, inhibit germinating through mould, yeast and bacteria, increase the chemical stability of sensitive active agents towards the atmospheric oxygen and influence the sensory perception as e.g. Among other things they enable the manufacturing of products with different structures like creams, gels, pastes, lotions, solutions, varnishes, sticks, powders and aerosols. ![]() They may be categorized with the term "additives" and have various functions.Īdditives have various functions. Besides the lipid substances for skin caring purposes and the lipid and water soluble active agents the INCI declaration of a cosmetic product generally lists a variety of further ingredients.
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