Coffee and Caffeine FAQ

are those numers suppose to be mg./ oz? It looks like the espresso is and the other 2 are mg./8 or 12 oz cup. Can you clarify please.
Also I have read a long string of answers and questions. I would like to add to it:
Much of the information that follows I gleaned from detailed discussions with the owners and brew masters of Java Cofee and Tea Co. They have a shop in Houston for 30 years at least and a website. Each coffee is graded by acidity and mild-bold flavor. Between them, my nurse's training which includes chemistry, and experience with coffee over the years, this is some information I have obtained:
From my understanding of the chemistry of caffeine, it does not evaporate. Instead it is the acidty in the coffee that destroys the caffeine over time. Anyone who brews tea knows that tannic acid in the tea destroys the caffine, right? so you try to brew it to reduce the tannic acid production which enhances the caffeine content. Also the flavor and drinkability of the brew for those of us who have sensitive stomachs, as the taste of tannic acid is harsh. The lower acid coffees therefore generally have more caffeine, better taste, If you ask me. I have acid reflux and acidic coffee really upsets my stomach. So I have a built in acid barometer, lol. Coffee that sits on the heat definitely becomes more acidic, harsher tasting and the caffeine might become more concentrated too if the acid were not destroying it. But saving coffee at room temperature does not necessarily lose the caffeine if you have a low acid coffee. I believe Robusto beans also have much higher acidic content than most arabica, giving it less refined taste and destroying some of that extra caffeine. Another source of destroyng the caffene is in the roasting process. What degree heat are the beans at when roasting? My impression of Starbucks Coffee beans are generally roasted fast at higher heat, making them very dark and for my taste, burnt tasting and lacking in caffeine. I work nights and I need decent amounts of caffeine to make it, lol.

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