Caffeine is very stable, yes. But you’re not adding much if you’re adding just the dregs post-brew. Most of the caffeine is gone by the end of a normal brew. (This is quite unlike tea where you need several brews to get all the caffeine, so despite teas having more caffeine by weight than coffees most of the time, brewed tea has less.)
I feel like the espresso I brew isn’t really that potent? I get a 330ml mug of espresso out of 10g coffee grounds. And then it’s not even real espresso, it’s just crummy stove top pot “espresso”. I started drinking it that way because I was poor and it was a great way to get a lot of flavor for a little coffee grounds. Which I’d also occasionally recycle haha. But I’d be curious to know how actually potent it becomes. How would a person measure such a thing?
There’s coffee snob sites out there that will go into incredibly gory detail of roast levels and brewing mechanism and caffeine measurement. Like this one. And a myriad of others. (I just took the first hit off a search here, but the search terms were “detailed caffeine breakdown in coffee by varietal, roast, and brewing mechanism”. There were many, many, many more hits if that one’s not suitable. Like this one.)
I checked those out and the information is just vague.
They will say things like a 8 oz cup of coffee has 90 mg of caffeine. They won’t tell you how much ground coffee was used to achieve that.
They use weasel statements like espresso will have more, longer brew times will have more. Vague descriptions like “a typical 12 oz coffee will have 95 mg of caffeine, depending on how much coffee grounds were used”
Caffeine is very stable, yes. But you’re not adding much if you’re adding just the dregs post-brew. Most of the caffeine is gone by the end of a normal brew. (This is quite unlike tea where you need several brews to get all the caffeine, so despite teas having more caffeine by weight than coffees most of the time, brewed tea has less.)
You sound confident, like you know things!
I feel like the espresso I brew isn’t really that potent? I get a 330ml mug of espresso out of 10g coffee grounds. And then it’s not even real espresso, it’s just crummy stove top pot “espresso”. I started drinking it that way because I was poor and it was a great way to get a lot of flavor for a little coffee grounds. Which I’d also occasionally recycle haha. But I’d be curious to know how actually potent it becomes. How would a person measure such a thing?
There’s coffee snob sites out there that will go into incredibly gory detail of roast levels and brewing mechanism and caffeine measurement. Like this one. And a myriad of others. (I just took the first hit off a search here, but the search terms were “detailed caffeine breakdown in coffee by varietal, roast, and brewing mechanism”. There were many, many, many more hits if that one’s not suitable. Like this one.)
I checked those out and the information is just vague.
They will say things like a 8 oz cup of coffee has 90 mg of caffeine. They won’t tell you how much ground coffee was used to achieve that.
They use weasel statements like espresso will have more, longer brew times will have more. Vague descriptions like “a typical 12 oz coffee will have 95 mg of caffeine, depending on how much coffee grounds were used”
Okay lol