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Questions tagged [caffeine]

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0
votes
2answers
110 views

How do I prepare (any) coffee with desired caffeine concentration?

I’m an student from Tampere, Finland, and I’m doing an essay on the effects of coffee (caffeine). However, how to determine the caffeine content in each serving of coffee is unclear. How do I prepare ...
3
votes
2answers
137 views

What is a reliable source for the caffeine content in tea?

If you do a quick google search for "Tea caffeine content" you may get varied results anywhere from 20mg up to 45 for black tea. I wonder: Where do all these numbers come from? Are they estimations? ...
2
votes
1answer
298 views

What's a microscoop?

I've bought pure caffeine powder and its serving size is said to be a microscoop, but no measure of weight is given. So what's/what size is a microscoop? "Microscoops" can be found from the internet,...
1
vote
2answers
248 views

How much EGCG and caffeine can specific amount of water absorb from tea leaves?

For example; 1) 100mL water + 4 tablespoons of green tea leaves 2) 100mL water + 12 tablespoons of green tea leaves Will the second one result with higher EGCG and caffeine content? Or is there a ...
2
votes
1answer
3k views

English Breakfast vs Ceylon tea

Which tea is stronger, i.e. gives a better puch for a wake up? I know that English Breakfast is a mix which among others includes Ceylon, and I read that Ceylon is a very strong black tea (the ...
0
votes
1answer
190 views

Why would coffee cause stomach cramps? Are there alternatives to Caffeine? [closed]

As a student, I am (I was) caffeine-dependant. But whenever I drink coffee I get stomach cramps. Is there a biological/biochemical explanation for this? Why would caffeinated coffee have this effect ...
2
votes
2answers
2k views

Is Pickwick green tea deceffeinated?

I am referring to this brand: http://www.amazon.com/Pickwick-Green-Tea-Original-Packages/dp/B003YBNJH8 The box doesn't say anything. I drank several and while I felt weird, my pulse was normal. I can'...
2
votes
3answers
2k views

Caffeine pills don't dissolve in hot tea

I'm drinking Rooibos Vanilla Tea and I like to dissolve an 80 mg caffeine pill in it. I hand press the pills myself from pure caffeine powder. However, the pill doesn't dissolve very well in the tea. ...
2
votes
4answers
2k views

Why does caffeine taste bitter when added to tea?

Black tea contains about 40 mg of caffeine. When adding 80 mg of caffeine powder, the tea tastes bitter. Why doesn't caffeine that is already in the tea or in an energy drink taste bitter and how ...
-5
votes
2answers
3k views

Amount of caffeine per bean of Starbucks bagged coffee (big secret I guess) [closed]

What is the amount of caffeine in one single coffee bean, and how much of that caffeine actually drips through when brewed with a regular coffee machine? Say Starbucks House Blend for example, (the ...
6
votes
1answer
8k views

What method of coffee preparation gives the most caffeine in the finished cup?

As the question asks, which method from the list below will give the most caffeine in the final product (ie. a cup of coffee). Assume the same beans with the same grind (while the different ...
7
votes
3answers
2k views

Multiple tea infusions and caffeine concentration

I have read conflicting things about the volatility and solubility of caffeine, and at what point during the tea brewing process caffeine is released. When tea is used for multiple infusions, such as ...
4
votes
2answers
1k views

All else held equal, does a pot of tea have more total caffeine than a mug?

Let's say you have one tea bag and can either brew it in a mug of boiling water, or a larger tea kettle of boiling water. The temperature, steeping time, type of tea bag, etc. are held constant. ...
16
votes
3answers
44k views

Does black tea have the highest level of caffeine? If so, why?

It's said that tea, in general, has lower levels of caffeine than coffee, and that black tea has more caffeine than green tea (which has more caffeine than white tea). This suggests that the higher ...
2
votes
1answer
884 views

Is there any caffeine in kuding tea?

Does anyone know if the bitter kuding tea (苦丁茶) contain caffeine?
7
votes
5answers
31k views

Why does instant coffee have less caffeine?

I had gone completely cold-turkey on caffeine for a while due to anxiety issues, and I'm slowly reintroducing caffeine to my diet. I have read in many places that freeze-dried instant coffee has less ...
4
votes
3answers
6k views

Are there visual differences between regular and decaf coffee?

I once asked a waiter at a restaurant how he managed not to mix up cups of regular and decaf coffee when bringing them to various tables. He replied that he could tell by looking at the bubbles – in ...
11
votes
1answer
14k views

How do they get caffeine out in decaffeinated coffee?

Coffee beans naturally contain caffeine. At the store or in a restaurant, you can choose "decaffeinated coffee". Is really all the caffeine gone or is there just a smaller amount? How do they remove ...
12
votes
4answers
27k views

Difference in caffeine levels between light and bold coffee?

Over the last few years I had come to believe that the roasting process for bold coffees removed caffeine from the beans resulting in a lower caffeine content than compared to a light roasted coffee. ...
2
votes
3answers
859 views

Which Type of Japanese Green Tea Has the Highest Amount of Caffeine?

I am trying to find the best pick-me-up Japanese green tea and was wondering which type was the best to get from the assortment of Sencha, Gyokuro, Kabusecha, Bancha, etc.
10
votes
10answers
85k views

Does brewing tea for longer result in higher caffeine content?

The ISO standard for brewing tea says "6 minutes". Of course different teas have vastly different properties, but... For "average commodity black tea" and "average commodity green tea", will leaving ...
11
votes
8answers
2k views

Bagged or Loose Leaf Tea

What are the practical differences between using bagged vs. loose leaf tea? Are there differences in quality, caffeine content, etc.? Why?
15
votes
9answers
26k views

How can I maximize the caffeine content of my coffee?

Like many people, I rely on coffee in the morning to really get me going for the day. I always use more than the directions require to get more caffeine for that extra morning jolt. How much ground ...
4
votes
3answers
516 views

Similar flavors to caffeine?

My wife and I enjoy drip coffee, french pressed coffee, espresso, black tea, green tea, and just about anything caffeinated. However, my wife wants to avoid caffeine due to its physiological effects. ...
16
votes
2answers
41k views

How can you measure the caffeine content of a liquid at home?

I saw a question on here about cold brew vs hot brew caffeine content and was wondering what is the easiest (or best) way to measure this at home (if possible)
42
votes
20answers
141k views

Caffeine content of cold-brewed coffee: higher or lower than hot-brewed?

I recently rediscovered the joys of cold-brewing coffee. (One level cup of rough-ground beans, 4-1/2 cups of cold water, steeped overnight and strained, produces a rich coffee concentrate. A shot or ...