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Old 09 April 2009, 02:49 AM
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snopes snopes is offline
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Blow Your Top Reheating coffee alters caffeine

Comment: My co-workers says that reheating coffee in the microwave
sublimates the caffeine in it. Is that true?
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Old 09 April 2009, 02:51 AM
Arrow Tech IV Arrow Tech IV is offline
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Is this person trying to say that the total amount of caffeine in the coffee is supposed to be reduced by reheating?
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Old 09 April 2009, 07:22 AM
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Floater Floater is offline
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I'd say it is more probably increased as the water evaporates.
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Old 09 April 2009, 07:43 AM
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Tarquin Farquart Tarquin Farquart is offline
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I was hoping reheating created super-caffeine.
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Old 10 April 2009, 12:20 AM
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Esprise Me Esprise Me is online now
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Originally Posted by Arrow Tech IV View Post

Is this person trying to say that the total amount of caffeine in the coffee is supposed to be reduced by reheating?
I had to run to my dictionary because I thought maybe there was some definition of "sublimate" with which I was not familiar. There isn't. I do not think that word means what the questioner thinks it means.

"Sublimate" can refer to a substance in a solid state passing directly into a gaseous state (or vice versa) without becoming a liquid first, a process of dyeing, or a way of channelling a sexual impulse into a socially accepted action. Since coffee is a liquid not used in dyeing that has no impulses, sexual or otherwise, of its own, I'm not sure what the microwave is supposed to do to it.

ETA: The venerable coffee experts at Cafe Britt did advise me against reheating coffee. They sort of implied it was a sin, roughly on par with kicking puppies, as it totally destroys the flavor. They must have more sensitive palates than I, because I don't mind the taste--it's just a bit more potent. Then again, those Costa Ricans like to use twice as much water in their coffee as we do in the States, so maybe potency is the devil as far as they're concerned.

Last edited by Esprise Me; 10 April 2009 at 12:26 AM.
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Old 10 April 2009, 07:12 PM
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Ali Infree Ali Infree is offline
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For my money, reheating coffee in a microwave is the only way to do it. I used to throw cold coffee in a pan and put it on a burner. That produced an oily, nasty tasting beverage compared the blessed microwave, praise DOYC

Ali "need my caffeine" Infree
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Old 10 April 2009, 07:24 PM
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LizzyBean LizzyBean is offline
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I don't know about the caffeine content changing (although it'd be nice if it would super charge it!) but it sure alters the taste. Sorry Ali, but blech!
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