Sodium lauryl sulfate is sometimes referred to as the coconut surfactant because it can be manufactured from coconut oil. How safe is it? How natural is it? And, how does it affect our bodies?
What does Sodium Lauryl Sulphate do to Your Skin?
Linear Alkyl Sodium Sulfonates (LAS), including sodium lauryl sulfate, consitute some of the most common surfactants in use. Skin contact with these surfactants can give rise to skin irritation and damage. Skin irritation and damage occurs if your skin comes in contact with this surfactant for long enough. This is due to the effect the surfactant has upon the structure of the membranes of your skin.
Basically, a surfactant such as sodium lauryl sulfate affects your skin by partially dissolving the cell membranes of your skin cells. This anionic surfactant is also able to penetrate right into living cells. Cell membranes are made up primarily of lipid (another name for fat) molecules. The molecules of the lipids which compose the membrane of cells are very similar in nature to anionic surfactant molecules. And, it is therefore not surprising that some surfactants are very readily absorbed into the skin cell membranes. Sodium lauryl sulfate is one of the most readily absorbed surfactants, in fact, and it has been chosen for experimental purpose to enhance the penetration of different elements in living systems.
The damage taking place to your skin when you use this surfactant is not noticeable to you at first. Only at sufficiently high concentrations of sodium lauryl sulfate on your skin will you detect the damage that it is causing. At lower concentrations, you will still suffer cellular damage; you just will not be able to tell it is happening.
In an experiment comparing different skin irritants including hydrochloric acid, DMAC and others sodium lauryl sulfate showed a most significant effect on skin mitotic activity (cell division rate). This is to say, that with applications of between 0.5% sodium lauryl sulfate and 2% sodium lauryl sulfate increased cell division rates up to twenty five fold. Skin cells respond in this way when they suffer damage. Not only this, but, at levels of 2% sodium lauryl sulfate the solution was sufficiently toxic to prevent cells from dividing at all and perhaps destroying them.
In other experiments sodium lauryl sulfate was was shown to specifically remove ceramides and cholesterol from the skin. These compounds are responsible for the barrier function of skin. Other studies have shown that proteins are removed from skin that is being rinse with sodium lauryl sulfate solutions. This means that the protein component of your skin's surface is in actually, in part, being de-natured and washed away when you wash your body with a cleanser which contains the surfactant sodium lauryl sulfate.
Sodium Lauryl Sulfate from Natural Sources is not Necessarily Safe
Besides the direct harm that Linear alyl sodium sulfonates can cause to the surface and the cells of your skin, as with many synthetic compounds, these surfactants will carry with them minute amounts of trace impurities. Sodium lauryl sulfate can be produced from palm oil; hence it is know as the coconut surfactant. For this reason sodium lauryl sulfate is often regarded as a safe, natural source surfactant. Unfortunately, though it is derived from plant sources, it can not be expected to be toxin free.
The manufacturing processes used to create sodium lauryl sulfate are still subject to tainting with dioxins even when they are produced from plant sources. Benzenes may also be present as impurities. These toxins are carcinogenic and are harmful to the unborn. Not only are they harmful to the person who uses the detergent that accidentally contains them, but, they are frequently leaked into the environment during the manufacturing of the surfactant. Outbreaks of dermatitis, in Scandinavia, on a couple of occasions, were traced to impurities which were present in particular improperly processed batches of sodium lauryl sulfate used to produce detergent with.
References:
Gloxhuber, C., Klaus Kunster; Anionic Surfactants: Biochemistry, toxicology, dermatology, Surfactant Science Series, Volume 43, second edition, revised and expanded. New York, USA, 1992. pages 299 - 302,
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All About Surfactants in Laundry Detergents
Surfactants are the workhorses of your laundry detergent. We use a lot of these chemicals every week, but do we understand their impact upon our environment and our health?