1.Caffeine In Loose Leaf Black Tea Vs Loose Leaf Oolong Tea
According to the article "Analysis of the Proportion of Bound Caffeine in Different Teas" published in the Journal of Yunnan Agricultural University, the proportion of bound caffeine in teas with a greater degree of polyphenol oxidation is inferred to be greater according to the experimental results.
Among the black teas, Pu'er tea (ripe tea) and Liu Bao tea have higher content of caffeine binding, accounting for about 20% of the total caffeine. The proportion of caffeine bound in Anhua black tea (2.15%), which is also a black tea, was much lower than that in Hubei old green brick (7.43%).
In loose leaf black tea, the proportion of combined caffeine was 7.58% to 12.50%.
Among the loose leaf oolong tea, the proportion of caffeine bound in the sample of Dahongpao was also higher (4.52%). Among the oolong tea samples, the proportion of caffeine bound in Tieguanyin and Jiedingtian oolong tea samples was close to that of green tea samples (<2%).
The proportion of caffeine bound in yellow tea and white tea ranged from 2% to 6%.
The proportion of caffeine bound in green tea was generally low. The proportion of caffeine bound in Pu-erh raw tea (which is a green tea) was small (0.94%).
Therefore, we can roughly summarize the caffeine content of different loose leaf tea from high to low: Puerh tea > black tea > oolong tea > yellow tea > white tea > green tea > decaffeinated tea > cold brewed tea.
2.The Effect Of Brewing Methods On The Caffeine Content In Tea.
- As the steeping time increases, there is a slight increase in the amount of caffeine in the tea.
- As the number of steeping increases, the caffeine content in the tea drops dramatically.
- As the water temperature for steeping increases, the amount of caffeine in the tea gradually increases.
To reduce the caffeine content in tea, the most effective method is to avoid drinking the first infusion. Additionally, you can also lower the water temperature for brewing.
3.The Caffeine Content Of a Cup Of Tea
Adults' daily caffeine intake can be categorized into the following levels: 80-250mg is a low intake, 300-400mg is a medium intake, and more than 500mg is a high intake . The caffeine content of tea brewed daily (hot water brewing, each brewing time of 10-30 seconds) is affected by the brand of tea, the temperature of the water in which it is brewed and so on, and the caffeine mass dissolved in 2.0g of tea brewed 3 times is about 60-90mg. The mass of caffeine dissolved in 2.0g of tea steeped 3 times is about 60-90mg.
4.Caffeine Content of a Cup of Coffee
The average caffeine content of a cup of coffee is 100mg, but in reality it varies greatly from coffee to coffee. A cup of espresso can have as little as 50mg of caffeine, while a cup of drip coffee can have as much as 200mg of caffeine.
It's hard to say exactly how much caffeine each type of coffee contains, but all you need to know is which ones will help you refresh your mind without exceeding the 300mg daily limit. There are also many factors that affect the amount of caffeine content.
4.1 Caffeine Content of Coffees with Different Levels of Roasting
Many people think that the caffeine content of dark roasted coffee is higher because the coffee has a stronger flavor. But in fact light roasted coffee has more caffeine per unit, this is because light roasted coffee is denser.
4.2 Caffeine content of coffee powder
Each type of coffee requires a different thickness of coffee powder, for example, espresso and Turkish coffee require very finely ground coffee powder, so the caffeine content per unit of these two types of coffee is higher.
4.3 Caffeine content of different bean varieties
The caffeine content of different coffee varieties varies. Robusta coffee (which is of lower quality and mostly used for instant coffee) has twice the caffeine content of Arabica coffee (which is of higher quality and accounts for 70% of the world's total coffee supply).
Excelsa coffee is a naturally lower caffeine coffee variety and is produced in very low quantities. It is usually used in blending with Arabica to make lower caffeine coffees.
4.4 Caffeine content of different brewing methods
The longer the brewing time, the higher the caffeine content. The brewing time varies depending on the brewing method, for example, French press coffee needs to be soaked for a few minutes before pressing, and therefore has a higher caffeine content; drip coffee also has a higher caffeine content, and espresso with a longer brewing time, such as Lungo, also has a higher caffeine content.
In addition, the ratio of water to powder also affects the caffeine content, so if more coffee powder is used, the caffeine content will be higher.
4.5 Caffeine Content of Coffee Produced by Different Cafes
The caffeine content of coffee made by different brands of cafes varies widely, for example, McCafe's coffee is 1/2 the size of Starbucks coffee in the same size situation, while Caribou is in between.
4.6 As a consumer, how do you choose how much caffeine to have:
- Ask the waiter;
- Coffee with milk and other flavorings is usually a little less caffeinated for the same size;
- If you are not sure, try to order a smaller cup.
 SMITH P F,SMITH A,MINERS J,et al. The Safety Aspects ofDietary Caffeine[M]. Australia: Report from the expert workinggroup,2000.
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