half-life of caffeine molecules
I am interested in the caffeine content in various coffees.
Will day-old coffee have much less caffeine? I am refering to espresso drinks such as the Starbucks Americano or the drip coffees also available there. Does refrigeration make much difference to the half-life? What about re-heating?
How about instant? I have seen charts comparing caffeine content in various fresh coffees but not instant. What is the typical caffeine content of instant coffee? What is the half-life of caffeine in instant coffee on the shelf as a room temperature solid?
Best Answer
According to Sigma-Aldrich, pure caffeine has a shelf-life of four years at room temperature, or many years at 2-8°C.
A caffeine solution can be stable for months even at moderately high temperatures.
So, essentially, your day old coffee has still all its caffeine in it, although probably it does not taste that well, but that's caffeine unrelated.
As a side note, after drinking coffee/tea/Coke/etc. it will take ~1-2 hours for blood caffeine levels to peak. Caffeine half-life in the body is ~3-6 hours.
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What is the half-life of 200 mg of caffeine?
The answer: Caffeine lasts in our systems anywhere from 4 to 6 hours on average, and it has a half life of about 5 hours. That means if you consume 200 milligrams of caffeine, after 5 hours, you'll still have 100 milligrams left in your body.Does caffeine have a 6 hour half-life?
The half-life of caffeine \u2014 which refers to the time it takes the body to get rid of half the amount you consumed \u2014 is about three to six hours.How long does it take for caffeine to degrade?
In the average adult, the half-life of caffeine is about 5-6 hours. This means that once take a dose of caffeine, you'll break down about half of that caffeine after 5-6 hours. So if you take in 200 mg of caffeine at 9 am, you'll still have about 100 mg left in your body between 2 and 3 pm.What is the 1 2 life of coffee?
According to the American Academy of Sleep Medicine, caffeine's half-life is up to 5 hours. Half-life is the amount of time it takes for a quantity of a substance to be reduced to half the original amount.Caffeine Half-Life Project [HD]
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Answer 2
For brewed coffee…after 6hrs there will be half as much caffeine in your cuppa. After another 6hrs, there will be half of that and so on.
At least that's the story that I heard.
Whole coffee beens store longer than ground beans so I imagine freshly ground coffee will contain more caffeine than ground or instant coffee brands.
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