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4
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There have been a number of scientific studies addressing the question of how much caffeine is extracted depending on brewing time. Perhaps the most cited is from 1996, but a 2008 study (carried out … to debunk the myth that tea can be decaffeinated with a 30-second steep) also gives some useful data with a variety of teas. To address your question specifically, approximately 70-80% of caffeine
answered Apr 10 '14 by Athanasius
4
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This study specifically addresses the question regarding multiple infusions: Results for all kinds of tea samples showed that the second tea infusion contained the highest contents of caffeine … decreased gradually in later infusions. The paper measured 8 successive infusions on a variety of teas. You can see how caffeine content varied exactly in their data. …
answered May 25 '15 by Athanasius
5
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number of studies have noted, for example, that tea fannings will release caffeine faster than similar whole-leaf tea. Thus, to answer part of the OP's question which has not yet been addressed, it is … possible the tea bags with smaller bits of tea will have a higher caffeine content for the same steep time than whole-leaf tea. Similarly, other chemicals may often be released faster, leading to a …
answered Aug 17 '14 by Athanasius