Why Does Lettuce Turn Brown?


Lettuce turns brown because of a chemical reaction to oxygen. This reaction is called enzyme-catalyzed oxidation. The enzyme reaction produces quinones that lettuce to turn brown when in contact with oxygen.
Q&A Related to "Why Does Lettuce Turn Brown?"
Lettuce turns brown when it goes bad and rotten because air traps odors and bad air that makes it go bad and stuff.
Metal Knife. Cutting lettuce with a metal knife causes the produce to turn reddish-brown in color. The carbon in a metal knife reacts with the lettuce enzymes and causes oxidation
Actually, it's not the metal that does it. What happens is any cutting will cut cells,
Guacamole turns brown due to what is known as enzymatic browning. Enzymatic browning results in the production of melanins, the same chemicals that provide the pigment in human skin
1 Additional Answer
It turns brown from cutting it with a knife. Lettuce should always be torn or they make some special lettuce cutters that are made of plastic.
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