singletrack65 replied: "Everyone reacts differently to caffeine. I can drink enough to give me the shakes & still go to sleep, others have one soda (1/3 the caffeine of coffee) and are up all night.
It may mess up her sleep patterns so she may not be as awake in the morning as she would be without the coffee. To prevent the chance of that, I never drink anything other than decaf in the evening."
Daniel replied: "like any drug its possible to eventually build up a tolerance to it, that is why people need a higher dosage to see its effects over a period of use."
How does caffeine, the coffee flavor and aroma get transferred to hot coffee? Since water is a polar liquid and the soluble fractions of coffee grounds are non polar... how is the caffeine, flavor and aroma transferred to hot coffee? In chemical terms..
Gabry Hyrule replied: "Solubility is relative. Saying that something is soluble in something is just saying that LARGE amount of it will get in the solution. Obviously, even if you put a 20-carbon alkane into water, you WILL have some molecules of the hydrocarbon here and there in the water.
When you look at caffeine, sure it's not too polar, but it can do lots of H-bonds. Even if it doesn't help that much, caffeine will be solvated to some extent by the water. The quantity of caffeine you actually WANT to drink is lower than what you could put in solution. In tea, it's about 1g/100mL water, and that's enough for a normal beverage. Caffeine is a poisonous alkaloid after all.
Obviously, caffeine is sovated more easily in hot water than in cold water, and that's probably why humans drink hot coffee, as opposed to cool coffee (new trends)."
how would dichloromethane affect the extraction of caffeine from coffee? Tea has very few components, other than caffeine, that dissolve in dichloromethane. Coffee contains a number of volatile, oily compounds. How would the dichloromethane affect the extraction of caffeine from coffee, if we used the same procedure (adding dichloromethane, centrifuging, removing the base layer and then setting up a filtration after repeating the addition and removal steps 4 times) we used to extract caffeine from coffee that we used to extract caffeine from tea?
Green replied: "I'm not sure what you are asking. I cant see anything wrong with your reasoning, so yes, you could probably use the same procedure.
DCM would still extract the caffeine, your oily compounds are most likely terpenes of one sort or another and non-polar, so have a poor affinity for the DCM.
I believe DCM was used as solvent for decaff coffee in the distant past, However, these days they use CO2 gas as the solvent.
Sorry that I can do little more than just agree with you."

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