http://www.mendeley....od-preparation/
Recent interest into the possible benefits of l-theanine found in tea has raised the issue that there are few data available on amounts of l-theanine contained in cups of commercially-available teas, prepared by a standard method. HPLC along with a standard method of preparing tea was employed here to determine amounts of l-theanine in cups of tea and the effects that various preparation factors have on amounts of l-theanine extracted. Brewing time was found to be a major determinant of the amount of l-theanine extracted, while the addition of small amounts of milk and sugar made no significant difference. High levels of milk resulted in a marked lowering of the level of detectable l-theanine. Contrary to previous research, a standard (200. ml) cup of black tea was found to contain the most l-theanine (24.2 ?? 5.7. mg) while a cup of green tea contained the least (7.9 ?? 3.8. mg). ?? 2010 Elsevier Ltd.
I was looking for how much theanine was in black tea, as we keep hearing green tea is the best place to go. Then I come across this. Now if this is the case, I'll keep drinking my tasty black tea which has less flouride and more theanine in it.
But this is just 1 study. Can anyone find any more info on this?