"No caffeine, please". (Science Letters).How do factories make certain kinds of tea decaffeinated de·caf·fein·at·ed adj. Having the caffeine removed: decaffeinated coffee; decaffeinated soft drinks. de·caf ? Ellen Sweeney, Age 11 California I made a phone call to the Tea Association of the USA. Here is what they told me. A factory has a lot of complicated ways to process tea leaves. Your question has to do with a chemistry problem--how to take away a chemical (caffeine) that some people don't want but leave the chemicals that give the flavor we do want. Lots of different ways have been tried. Here's one that is widely used. Tea leaves are placed in a chamber containing carbon dioxide carbon dioxide, chemical compound, CO2, a colorless, odorless, tasteless gas that is about one and one-half times as dense as air under ordinary conditions of temperature and pressure. at high pressure (about three hundred times the air pressure around us). In that chamber, carbon dioxide is a liquid that dissolves out most of the caffeine while leaving most of the flavor chemicals. Almost the same process is used on coffee beans coffee bean see sesbania. for decaffeinated coffee Noun 1. decaffeinated coffee - coffee with the caffeine removed decaf coffee, java - a beverage consisting of an infusion of ground coffee beans; "he ordered a cup of coffee" . |
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