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5 results for “photoprotective dermo-cosmetic product”
Figure 6: Erythema values before and after 10 minutes from application 57 -STUDIES TOWARDS OBTAINING A PHOTOPROTECTIVE DERMO-COSMETIC COMPLEX PRODUCT WITH NATURAL EXTRACTS OF INORGANIC AND ORGANIC SUBSTANCES
<p>The values of the erythema are relatively low, which indicates that the<br> product is compatible with the skin and has no sensitizing potential (¯gure6).<br> Having a complex composition of ingredients with varying degrees of un-<br> saturation, with the major organic structure, the product is subjected to de-<br> structive processes at the impact of UV radiation and atmospheric oxygen.<br> As a result this organic substances undergo structural changes, embodied in<br> the initial color change, division of chain, forming oxidizing action groups and<br> oxygen free radicals that continue the destructive process. Because of these<br> features, the product was subjected to accelerated tests of thermal and photo<br> destruction. As a result of these tests, the product's characteristics have not<br> changed signi¯cantly.</p>
Figure 2: Variation of the shear stress depending on the speed rate 54-STUDIES TOWARDS OBTAINING A PHOTOPROTECTIVE DERMO-COSMETIC COMPLEX PRODUCT WITH NATURAL EXTRACTS OF INORGANIC AND ORGANIC SUBSTANCES
<p>The evaluation of photodegradation was carried out through the variation<br> of photoprotective factor of the studied product kept 60 minutes under UV<br> radiation at 65±C. The tests revealed the preservation or even a slight increase<br> in the SPF. The use of screen substances in the formulation of photoprotective<br> products results in undesirable sensory characteristics: visible white ¯lm on the<br> skin surface, unpleasant sensation, dry or oily skin after application.</p>
Figure 1: Spreadability (plasticity) Figure-STUDIES TOWARDS OBTAINING A PHOTOPROTECTIVE DERMO-COSMETIC COMPLEX PRODUCT WITH NATURAL EXTRACTS OF INORGANIC AND ORGANIC SUBSTANCES
<p>The physical and chemical methods used to characterize the row<br> materials and the ¯nal products are as following:<br> ² to ¯nd out the amount of inorganic substances (with screening role) the<br> samples were incinerated for two hours at 800±C;<br> ² the quantity of organic substance (with the UV ¯ltering role) was deter-<br> mined by an UV-VIS spectrophotometric method;<br> ² vitamins identi¯cation was done according to the European Pharma-<br> copoeia VI-th edition;<br> ² the photoprotective ability was tested by applying a standard amount of<br> emulsion on a synthetic skin device (0,2g=cm2);<br> ² to test the microbial stability were applied the European Pharmacopoeia<br> VI-th edition stipulations;<br> ² to estimate the compatibility with the human skin a standard quantity<br> of sample (0,2g=cm2) was laid under an occlusive patch.</p>
Figure 4: Determination of hydration of the skin before applying the product-STUDIES TOWARDS OBTAINING A PHOTOPROTECTIVE DERMO-COSMETIC COMPLEX PRODUCT WITH NATURAL EXTRACTS OF INORGANIC AND ORGANIC SUBSTANCES
<p>The volunteers who applied the product on the<br> skin appreciated the sensory characteristics such as: easiness of use, pleasant<br> texture, easy absorption without oily traces, appearance, odor and pleasant<br> color (¯gures 4, 5).</p>
Figure 3: Viscosity variation depending on speed rate Table-STUDIES TOWARDS OBTAINING A PHOTOPROTECTIVE DERMO-COSMETIC COMPLEX PRODUCT WITH NATURAL EXTRACTS OF INORGANIC AND ORGANIC SUBSTANCES-
<p>Microbiological characteristics The total number of aerobic germs and fungi<br> was determined by the decimal dilution method or the multiple tube test. For<br> identifying pathogenic species we have used speci¯c tests (table6).<br> The evaluation of photodegradation was carried out through the variation<br> of photoprotective factor of the studied product kept 60 minutes under UV<br> radiation at 65±C. The tests revealed the preservation or even a slight increase<br> in the SPF. The use of screen substances in the formulation of photoprotective<br> products results in undesirable sensory characteristics: visible white ¯lm on the<br> skin surface, unpleasant sensation, dry or oily skin after application.</p>
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