One of the main requirements for modern cosmetics is their resistance to pathogenic microbes.Most cream compositions are excellent nutrient mixture, not only favorable for skin cells, but also for the growth of microorganisms.And because our environment is literally saturated with different strains of bacteria and fungi spores, in order to preserve the quality of cosmetic products in the creams add substances called bacteriostatic or konservantami.Konservanty solve one of the major problems in cosmetics - protection products on the problem of corruption and compliance with the terms of its storage.By the way, this term according to international standards should be 2.5 years.
preservatives Another object is to destroy bacteria and fungi directly on the skin.
problem is that the destruction of microbial cells preservative must be toxic and, therefore, it can exhibit toxicity with respect to skin cells.The main negative qualities bacteriostatics - the ability to deprive the skin of natural flora and ca
most often as a bacteriostatic additives are used chemically synthesized substances or antibiotics (literally - the opponents of life).
most common and is considered the most gentle chemical preservatives - is parabens (methyl and propyl).Despite the widespread use in the formulation of cosmetic compositions, their security issues (including possible long-term consequences of their application) seriously concerned physicians.For example, recent research has shown that a widely used as a bacteriostatic methylparaben (the least toxic of all parabens) at a concentration of 0.1% almost completely destroys the cell system similar to the cells of our skin.
particularly dangerous derivatives formaldehyde and other aldehydes, which are denatured bio-organic molecules, and this, in turn, leads to a progressive aging of the skin.Also dangerous bronopol that can lead to the formation of mutagenic substances.
safest of the preservatives are, of course, natural substances that occur naturally in certain plants (sodium benzoate, salicylates, vitamins E and C, and so on. N.).Widely known for their antibacterial properties of propolis (bee glue), leaf extracts of eucalyptus, cherry, birch, black currant
pine bark extract, seaweed extract, many essential oils.
introduction of these substances into the formulation to reduce the concentration of preservatives and make the cream more safe for the skin, so it is likely they are the future of cosmetics.
But natural preservatives also have their drawbacks - too mild bacteriostatic effect, requires the use of relatively high doses of single-minded focus and specialization (inhibits the growth of bacteria, but does not interfere with live fungi or vice versa).
Any cream formulation contains no preservatives, but on the number and nature of the bacteriostatics leaflets and summaries are usually not reported.Judged on this can be indirect evidence and therefore adhere to certain rules of purchase of cosmetics.
• Prefer cosmetics packaged with a small hole.The wider mouth jars have, the more contact with the environment, and therefore more preservatives is a cream.
• Pay attention to the shelf life and storage conditions prepraty.The more shelf life and higher temperatupa storage, the more preservative put it in his
• And most importantly, keep the cream composition in a cool place, tightly closed.