Čaj do horka
Teď jsem si zrovna po ránu dal Qi Hong Mao Feng a je mi ještě větší horko, než před ním.



Zelene caje luhovane za studena tiez ochladia organizmus?


chcel som brat zeleny caj luhovany za studena do skoly, kvoli povzbudeniu, ale zistil som, ze ladove caje nemaju skoro vobec ziadny obsah teinu. Ale kedze maju ochladzujuci ucinok, najlepsie si viem predstavit ich vyuzitie v lete
No ale nechcel som vediet, ze ako posobi studena tekutina na organizmus, ale ci ten caj luhovany za studena ma ochladzujuci ucinok? chapes?


In 1996, Monique Hicks, Peggy Hsieh and Leonard Bell published a peer-reviewed scientific paper recording precise time related extraction of caffeine from tea using a modern detection technique (HPLC). This paper, 'Tea preparation and its influence on methylxanthine concentration,' appeared in Food Research International Vol 29, Nos 3-4, pp. 325-330. (FRI is copyright of the Canadian Institute of Food Science and Technology). Methylxanthines caffeine, theobromine and theophyllin all occur in tea and have similar physiological action, but in tea caffeine is the prominent methylxanthine.
In summary: Hicks et al measured the caffeine (plus theobromine) content of six different teas (three bagged and three loose-leaf, including black, oolong and green types). They measured caffeine-extraction in boiling water when steeped for 5 minutes, 10 minutes and 15 minutes. They replicated all their extractions three times to eliminate experimental error. Extrapolation of their data gives the following caffeine-extraction percentages below 5 minutes (averaged over all tea types and formats); note that while loose tea extracted marginally more slowly than tea-bag tea, it made only a couple of percentage-points' difference:
30 seconds: 9% caffeine removal
1 minute: 18% caffeine removal
2 minutes: 34% caffeine removal
3 minutes: 48% caffeine removal
4 minutes: 60% caffeine removal
5 minutes: 69% caffeine removal
10 minutes: 92% caffeine removal
15 minutes: 100% caffeine removal
plati, pre cisti kofein vo vode
2.17 g/100 mL (25 °C)
18.0 g/100 mL (80 °C)
67.0 g/100 mL (100 °C)
skusime cajovy liker?![]()
ethanol 15 g/L
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