Resteeping and Caffeine?
Posted: Mar 7th, '08, 09:32
I was curious, does Oolong tea still contain similar amounts of caffeine if steeped several times? Thanks
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Yep, that is why they say that gongfu brewing is a natural way to decaffinate your tea as it gets a majority of the caffine out during the first rinse. But me loves caffine ----> me at bedtime!Mary R wrote:I sort of answered that question in this month's Between the Leaves at TeaMuse.
The main paper I cite (Hicks 1996) tested two different types of Taiwanese oolong. The first lost 66.3% of caffeine after the first steep, the second lost 71.7%. In the second steep, the first lost an additional 25.6% and the second 22.4%. In the third steep the first lost 8.1% and the second 5.9%. All infusions were for a full FIVE minutes using BOILING water.
Basically, the tea won't become truly decaffeinated until it is spent, and a quick 30s to 1.5m infusion won't remove an adequate amount of caffeine to appease those rare caffeine-sensitive folks.
Mary R wrote:Basically, the tea won't become truly decaffeinated until it is spent, and a quick 30s to 1.5m infusion won't remove an adequate amount of caffeine to appease those rare caffeine-sensitive folks.
tenuki wrote:don't feed the troll.
Hicks and crew used 8 different types of teas: 2 black teas (Lipton tea bags and loose Asian black tea leaves), 2 different loose Formosan oolongs, 2 green teas (Lipton green tea bags and Korean green tea leaves) and 2 herbal 'controls (Celestial Seasoning's "Lemon Mist" and International Bazaar's "Cinnamon Apple.")abstract wrote:Hicks, M.B., Hsieh, P., & Bell, L.N. (1996). Tea preparation and its influence on methylxanthine concentration. Food Research International, 29, 325-330.
The amount of tea or coffee estimated from the number of cups consumed is frequently used as an indication of caffeine consumption in epidemiologic studies. However, this alone may be an inadequate indication of intake since drinking practices of tea varies. In this study, methylxanthine (caffeine, theobromine, and theophylline) contents in three brews of four types of tea (black, oolong, green, and herbal) in both bangs and loose leaf forms were investigated to determine the actual amount of methylxanthines present in tea as a function of different brewing methods. On a dry leaf weight basis, total caffeine after three brews was highest in black (32.8 mg/g) and green (36.6 mg/g) tea leaves and lowest in Formosa oolong tea 2 (23.8 mg/g). Total theobromine was highest in black teas (1.64 and 1.69 mg/g) and least in oolong teas (0.65 and 0.71 mg/g). Caffeine and theobromine were not detected in either herbal tea samples, and theophyline was not detected in any tea tested. The overall average caffeine released in the first through third brews were 69%, 23%, and 8% respectively. Three cups of tea brewed using three tea bags (Western culture) have approximatedly twice the amount of methyxanthines as the same volume prepared by three successive brews of loose tea leaves (Asian culture). These differences should be accounted for by the epidemiologic studies evaluating the effect of methylxanthines on health.
Don't feed the troll?Salsero wrote:tenuki wrote:don't feed the troll.
Mary R wrote:The infusion intervals and temperatures would be pretty undrinkable to me too...Hicks and crew weren't testing palatability, but rather showing for the first time that caffeine infusion does not follow a linear pattern.