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Because it makes us mourn the onion

has many people love to eat onions, but they do not, because someone must be cut, or not?, But evil is having to endure tearing, etc. smell. Besides the bad smell left in the hands and breath. But the big question is why make us mourn?

Onions contain a molecule that is odorless and follows the curious name of trans-(+)-S-(1-propenyl)-L-cysteine \u200b\u200bsulfoxide . When you slice the onion, produces cell disruption that allow an enzyme called alliinase contact the trans-(+)-S-(1-propenyl)-L-cysteine \u200b\u200bsulfoxide . This generates pyruvate, ammonia and syn-propanethial -S-oxide. The last molecule is responsible for eye irritation and tearing. In a few words to make us mourn inconsolably.

Figure 1. Reaction catalyzed by the alliinase

It is not clear why this is propanethial tear, but believed to be due to contact with water decomposes: popanal, sufúrico acid and hydrogen sulfide (Fig. 2). Sulfuric acid is possibly a very strong acid, which damages the membrane producing conjunctival tearing.

Figure 2. Propanethial decomposition.

If you cut under water, unless you crying?

The truth is that if you cut the onion under cold water unless you cry and this is because the propanethial is soluble in water and it helps that this substance is broken.
1. Helps eliminate propanethial because it is soluble in water ..
2. Propanethial helps the break with the wash water.

Bad breath

If you must leave or have an important meeting at work or with your partner, it is not advisable to consume this food.
Hydrogen sulfide produced in the above reaction rotten eggs, but not the only substance in onions that causes odor. Other sulfur products, such as dipropildisulfuro or alilpropildisulfuro , who also collaborate destroy your super breath.

Figure 3. Two guilty of the foul odor produced by eating onions.

Hands onion Past

soap, dish soap, it is very difficult to remove the smell, which is better, is water with a little lemon juice parsley or cilantro or wet scrubbing by hand, so it's easier for the bad smell is removed faster.
But after all the onion is not as bad, also attributed to him, positive things and good input health.
Sources:

Education in Chemistry. September 1999. http://www.uv.es/ ~ jaguilar / curioso.cebollas.htm

http://www.familia.cl/ContenedorTmp/La_cebolla/cebolla.htm