What kind of coffee is the most refreshing with more caffeine? The more bitter the coffee, the more caffeine?

"I'm so sleepy now! Have a deep baked one! Rich! Coffee... I need more caffeine to cheer me up. " The deeper the coffee is roasted, the more bitter it tastes, and the higher the caffeine content will be. Of course not!

The deeper the coffee is roasted, the higher the caffeine content?

No! In fact, the deeper the coffee is roasted, the more caffeine is lost. However, it is not without reason that people have this understanding.

Many people think that the deeper the coffee is roasted, the lighter the beans will be, so when brewing 15g coffee beans, we always feel more than lightly roasted coffee beans! This is like the feeling that a jin of cotton or a jin of iron is heavier. In addition, the deeper the roasting, the looser the internal structure of the coffee beans and the easier it is to extract the flavor substances of the coffee, so it is natural to think that the more flavor the coffee has, the more caffeine there will be.

There are also friends who checked the data, which mentioned that the melting point of caffeine is 235-238 ℃, and even if the coffee beans we drink are roasted deeply, it is difficult to carry them beyond this temperature before coming out of the oven. But you missed one of the items in the data: caffeine begins to sublimate at 178℃, in other words, caffeine does not disappear immediately after this temperature, but decreases as it is roasted.

In other words, if it is the same variety of coffee beans grown in the same area, the content of caffeine in light roasting is higher than that in deep roasting (although the difference is small, but if you say which caffeine is higher, it must be light roasting).

The reason why light baking has a higher caffeine content than deep baking.

The deeper the roasting, the lighter the weight of the coffee beans after roasting. In general, a coffee bean will be 11%, 13% lighter after shallow baking than that of raw beans, and 15%, 17% lighter than that of raw beans after deep baking. In addition to the water content of raw coffee beans, there are other soluble substances, including caffeine.

According to a report by the Coffee Science and Information Association, the caffeine content of the same coffee beans grown in the same area is 1.37% after light roasting, while the caffeine content after deep roasting is 1.31%, which is only a tiny difference of 0.6%. If you are eating coffee beans directly, it can be said that there is no difference. But! Through different extraction methods, the content of caffeine in coffee solution can be very different!

The time of coffee extraction determines the caffeine content.

Caffeine is one of the soluble substances in coffee. With the change of extraction time, the content of caffeine in water will be higher. It is important to note that caffeine is very resistant to extraction and will not speed up the dissolution of caffeine in water because of the high extraction temperature. In other words, the caffeine content of the same variety of coffee beans grown in the same area will be higher than that of drip / pressurized extraction.

Take the same variety of coffee beans planted in the same area as an example: it often takes more than 8 hours to make cold-extracted coffee, 15g coffee powder to extract 150g coffee solution, with a caffeine content of about 200mg; it takes 4 minutes to make a pressure pot coffee, 15g coffee powder extract 225g coffee solution, caffeine content is about 120mg; hand coffee production is about 2 minutes-2 minutes 30 seconds, 15g coffee powder extract 225g coffee solution, caffeine content is about 60-90mg Italian coffee machine extraction time is about 30 seconds, 15 grams of coffee powder extract 30 grams of coffee liquid, caffeine content is about 85mg

Why do I drink espresso / deep-roasted coffee more sober?

One is that this espresso you drink has robusta beans in it. Many coffee shops, which need to control costs and want their coffee to drink more full-bodied and have more coffee fat, choose to add a small amount of robusta beans. The Robusta variety itself contains much more caffeine than any Arabica variety of coffee beans! (Arabica coffee beans contain about 0.9-1.4% caffeine, while robusta coffee beans contain about 2-4% caffeine.)

The other is that you are not awake because of caffeine, but are simply awakened by suffering! Everyone is very sensitive to bitterness, so when it comes to coffee with high concentration or obvious bitterness, it stimulates the taste buds and spreads to the brain and nerves. And you just woke up like this!