Oz 236 ml cup of genmaicha contains about 17 to 18 milligrams of caffeine. However the chart shows the caffeine in 3 5 oz of each beverage. Genmaicha contains very little caffeine and is much less acidic than other teas because of the starch from the rice. The caffeine content will vary based on amount of tea used and steep time but generally the caffeine amount in brown rice tea is very low. So 60 ml of gyokuro will have about 0 096g of caffeine while 7 oz of sencha will have 0 04g.
Genmaicha 玄米茶 brown rice tea is a japanese brown rice green tea consisting of green tea mixed with roasted popped brown rice. It was also used by people fasting. Contrary to popular belief genmaicha does not induce sleep but is okay to drink at night because of its minimal caffeine content. Brown rice tea is usually made using boiling water and a brewing time of just 30 seconds. The caffeine content varies depending on the amount of tea used the steeping time and water temperature.
When looking at the caffeine amount you must also consider the amount of beverage consumed. The amount listed above is from the journal of food science s lab test of brown rice tea from yamamotoyama of america using 2 grams of raw tea. It can be higher when made using sencha or when matcha as added and because it has a mild flavor it can also be brewed fairly strongly. Genmaicha caffeine content one 8 fl. It is significantly lower than black tea at 60 to 80 milligrams or green tea at 35 to 50 milligrams.
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For gyokuro the preparation is 10g in 60ml water which is probably a typical amount. Oz 236 ml cup of genmaicha contains about 17 to 18 milligrams of caffeine.