Why Does Lettuce Turn Brown?

Answer

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.
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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.
http://wiki.answers.com/Q/Why_does_lettuce_turn_br...
Well, do you want the long or the short answer? I could give you all the scientific mumbo-jumbo, but let me try to condense it a bit. When you cut into an apple, you are exposing
http://www.ask.com/web-answers/Food_and_Drinks/Oth...
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 to occur. The
http://www.ehow.com/info_12209205_lettuce-turn-red...
Actually, it's not the metal that does it. What happens is any cutting will cut cells,
http://www.chacha.com/question/why-does-lettuce-tu...
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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