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Do bread baking and sunless skin tanning have anything in common? – The mystery of browning

Do bread baking and sunless skin tanning have anything in common? – The mystery of browning

Publish date: 2013-03-19

When we eat a toast or a roasted steak, we usually do not realise that the same kind of a chemical reaction, which is responsible for the specific taste and brown colour of these foods, takes place after the contact of skin with a self-tanning cream. The process, which is common in these two apparently completely distinct cases, is called the Maillard reaction and is of significant importance in many branches of technology, especially in the food industry.

Tags: cosmetology , other

How does the reaction proceed?

The prerequisite for the Maillard reaction is the simultaneous presence of an amino acid and a reducing sugar. The reaction, however, does not take place at room temperature; the usually essential factor triggering the process is heat. Such favourable conditions necessary for initiation of the reaction are encountered, for example, during baking of bread, where the combination of carbohydrates contained in wheat and proteins present in eggs results in the characteristic brown colour on the heated dough's surface.

The first step of the Maillard reaction is condensation of an amine group of amino acid and a carbonyl one of the reacting sugar. After this process, the resultant condensed product undergoes further rearrangements and finally, several compounds are formed. The resulting terminal products are attributable to browning and the flavour of treated foodstuffs, such as the savoury taste of roasted meat.

 

Sunless tanning of the skin

A very similar process to the one taking place during bread baking occurs after the contact of a dead layer of the human skin with so-called DHA based products. DHA, dihydroxyacetone, is just a simple sugar, containing three carbon atoms in its structure. When a DHA molecule contacts with amino acids present in a top layer of skin, again a cascade of rearrangements takes place, beginning with amine and carbonyl groups condensation. The maximal tanning induced by the cream action is visible after 8-24 hours after application and the effect lasts about one week. This period can be prolonged, when, apart from DHA, another sugar, erythrulose is added as a tanning lotion ingredient.

Since UV radiation is known to be responsible for skin aging and can potentially cause melanoma, the self-tanning specifics are a good alternative for people wanting to have bronzed skin without jeopardising their health.

 

 

Sources:

http://www.wisegeek.org/what-is-the-maillard-reaction.htm

http://en.wikipedia.org/wiki/Maillard_reaction

http://www.abcarticledirectory.com/Article/Tanning-Lotion-101--What-is-DHA-/135605

 

by Jakub Chrustowicz

 

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2017-01-14 19:32:27 +0100
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2016-04-03 05:58:03 +0200
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