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 upper limit for the absorbable amount? If not, how much difference can occur? 3x content of the first one?
Best Answer
3x tea would not mean 3x extract
But it is going to be close to 3x for small amount
Water is a good solvent for those chemicals but there is a limit
The solubility of caffeine is 2 g/100 mL at room temperature (by weight about 1 : 50). 66 gram / 100 mL at boiling.
A coke is 20 mg (milli 1/1000) 12 oz.
The caffeine we drink is not even close to saturation.
In extraction you equalize the mole fraction with a fudge factor. I don't know where to find fudge factor for tea. But it would favor the water.
A dry tea leaf is about 3% caffeine. Getting the caffeine out with boiling water you can pretty easily get up to saturation at room temperature. But you would need quite a bit of tea. 2 g caffiene would be 66 g of tea. A tea bag is about 2 grams.
In a commercial extraction they would use a solvent like ethanol.
Pictures about "How much EGCG and caffeine can specific amount of water absorb from tea leaves?"
Does tea have more caffeine if you brew it longer?
So yes, the longer you steep your tea, the more caffeine will infuse from the tea leaves to your cup. Each tea type provides a different amount of caffeine, so you should also consider selecting a tea with high caffeine levels if you are looking for that morning energy boost!How much caffeine is left in a used green tea bag?
According to the FDA, there are 30 to 50 milligrams of this compound in each cup of green or black tea. Generally, one tea bag is about 0.07 ounces (2 grams) \u2014 that's enough for a cup of tea. Herbal tea, on the other hand, contains little or no caffeine, depending on the plants used.Can you extract caffeine from green tea?
The content of major catechins in green tea extracts varied from approximately 280\u2013580 g/kg dry extract, with extraction efficiencies of major catechins varying from 61% to almost 100%. Content of caffeine in extract was in the range of 75 g/kg, where its extraction efficiency varied from 62% to 76%.How long does it take to extract caffeine from tea?
Teas were brewed at 80, 90, and 100\xb0 Celsius (100\xb0C = 212\xb0F, which is boiling) for various periods, from 30 seconds to an hour. For rolled and loose leaf tea, they found that for a period of 30 seconds to 15 minutes, the caffeine content of the brew increased rapidly, then it slowed down from 15 minutes to 60 minutes.Caffeine \u0026 Tea: Get the Facts from Emeric Harney
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Answer 2
There are two factors here, both of which will limit you.
The first is the solubility of caffeine in water. Paparazzi found it for room temperature, it is going to be higher for a hot beverage, but whatever it is, it is a hard upper limit. So, if you were to drop a tablet of 1 g pure caffeine into 100 ml water, and a tablet of 6 g into another glass of 100 ml, you would only get 2 g of caffeine from drinking the second water, not 6 g. But that's unlikely to matter in real tea making.
The second one is the extractability of caffeine from tea leaves. I am not going to do any back-of-the-envelope calculation for that, but basically, the amount of caffeine you can extract into the tea depends on the concentration of caffeine in the tea and the concentration of caffeine remaining in the leaf. The less concentration you have outside the leaf, the more can you get from inside the leaf to the outside. In practical scenarios, this is going to limit you much earlier than you hit the caffeine solubility problem.
It is impossible to predict how much the difference in extraction will be. Somebody with a scientific computing background and access to the right formula and hardware could make a model for a given tea making recipe and a given leaf, but a recipe which uses different time, temperature, and a different plant will end up with a different factor. The best we can say is, there will be a difference (it won't be the same amount extracted), but it will be noticeably less than 3x the same amount.
This goes for basically anything you extract from the tea, so also EGCG.
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