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Maillard reaction

may-YAR ree-AK-shuhn /maɪˈjɑːr riˈækʃən/

nounC1GRESAT

TechnicalAcademicCulinary

A complex chemical reaction between amino acids and reducing sugars, usually requiring heat, that results in food browning and the creation of deep, savory flavors.

Unlike simple caramelization which only involves sugars, this reaction requires proteins (amino acids) and produces hundreds of complex flavor compounds responsible for the smell of roasted coffee, seared steak, and baked bread.

The story behind the word. In 1912, French chemist Louis-Camille Maillard was trying to replicate protein synthesis in his laboratory. Instead, he mixed sugars and amino acids in a test tube and heated them, observing a rich brown mixture with a remarkably savory aroma. Though he published his findings, their profound significance to food science and culinary flavor was not fully realized until decades later.

Word relationships

non-enzymatic browning: A broader scientific term that includes both the Maillard reaction and caramelization, but lacks the specific focus on amino-acid sugar interactions.

enzymatic browning: Browning caused by enzymes when fruit is cut and exposed to oxygen, rather than heat-induced chemical reactions.

Commonly confused with

caramelization: Caramelization involves only the thermal decomposition of sugars, whereas the Maillard reaction strictly requires both sugars and amino acids.

Word family

Maillard (adjective): Relating to the chemical browning process discovered by Louis-Camille Maillard.

Collocations

trigger the Maillard reaction
Maillard reaction products
accelerate the Maillard reaction

Example sentences

"The Maillard reaction is responsible for the savory crust on a seared steak and the deep brown color of toasted bread." A scientific explanation of culinary browning.
"The Maillard reaction is the single most important chemical event in the kitchen, generating the aromas that define cooked food." From a classic book on food science.

Memory hook

Think of a 'Mall yard' where a giant barbecue is happening, filling the air with the rich, savory smell of seared steaks and browned buns. Mall yard barbecue smells delicious.

When not to use

Do not confuse this with caramelization, which is the pyrolysis of pure sugars without proteins.

Fun facts

The Maillard reaction happens faster in alkaline environments, which is why bakers dip pretzels in a lye or baking soda bath before baking to get that deep, dark crust.
This reaction can actually occur at room temperature, but it takes months or years, such as during the slow aging of balsamic vinegar.

Related words

caramelization

Explore more words

sear, ferment, reduction, savor, dehydrate, Synthesis