Why does toast smell?

Original title: Why does toast smell?
-scented, soft-mouthed bread is a favorite food for many people. During the baking process, the color of the bread gradually becomes golden and gives off a scent. Where do these scents come from?
, this is mainly due to a series of chemical reactions in the baking process. The most important of these is the Merad reaction. The Merad reaction is when roasted, fried, and cooked at high temperatures (usually above 120 degrees C), the carbohydrates in the food react with the protein, releasing some scented substances and changing the color of the food. In addition to the Merard reaction, there is also a caramelization reaction in bread baking. In the process of baking, the food surface of the water is constantly lost, the internal moisture can not be timely to supplement the spread, therefore, the food surface contains starch and sugar will be dehydrated into a variety of small molecular substances, these substances are not lack of volatile molecules, thus waving the smell of baking.
see here, you might think that since toast has a series of reactions, is it that the longer the bread is baked, the more thorough the reaction, and the sweeter the bread? This is not the case, acrylamide is produced during bread baking, a chemical produced by food during a series of high temperatures. Acrylamide is defined as Class 2A carcinogen by the International Agency for Research on Cancer of the World Health Organization and has potential genotoxicity, neurotoxicity and carcinogenicity. Acrylamide is the highest content in toast and French fries, and the longer the food is heated and the higher the temperature, the more it produces, which is more detrimental to the human body. Therefore, when we eat toast, we should try to choose a uniform color, the surface is golden, if the bread is baked do not eat.
a variety of bread on the market, we will inevitably not know how to choose when buying, in fact, as long as you have the following tips, you can buy nutritious and healthy bread. First, choose bread with less embellishment. Many merchants in order to sell good-looking, often add a lot of cream, chocolate, meat pine and so on to the bread, which will make the bread taste better, but also increase the fat content of bread, not conducive to good health; Many breads have too much flavor, perhaps with flavor added; If the bread particles are large, easy to drop slag, poor elasticity, it means that the bread production process used more additives.
is a breakfast partner and afternoon tea companion for many people, and it is especially important to pay attention to bread health. When baking bread, we should pay attention to the temperature and time control, avoid the production of too many harmful substances, in the selection should also pay attention to health principles, choose the right bread. (Joan Wang)