How long can't you drink the brewed coffee? Can the coffee be kept warm in an insulation cup? Will it go bad?

Coffee, especially freshly ground hand-brewed coffee, is very fragrant when it is first brewed, but the flavor and taste is not as good as it used to be after cooling. Therefore, many friends will ask questions such as "at which temperature is the best temperature for coffee to drink" and "how long can the freshly brewed coffee last?"

Why does the coffee taste bad when it is cold? Many people give back some information when drinking coffee. When the coffee is hot, the flavor is very rich, and when it is cold, it turns sour. In fact, it is caused by two reasons. The first reason is that the aroma of coffee is actually a process of substance loss. On the other hand, the substance of coffee is fixed when it is washed into the coffee liquid and will not be increased any more. When the coffee is still hot, the substance volatilizes faster, so you can clearly feel the fragrance in your nostrils. When it is cold, the volatile substances are less volatile, and the coffee itself has less flavor, so it is not as good as the hot one.

The second reason is our own sensory problems. For example, put 5ml lemon juice in 100ml water and you will find that the acidity will not change significantly unless it is too hot. The most sensitive perception of sweetness is when it is close to human temperature, just like adding a packet of sugar to a cup of hot water and tasting it at different temperatures. You will find that the sweetness is most obvious between 30 and 42 ℃. The same is true of bitterness. Friends in Guangzhou are most familiar with it. Drink herbal tea while it is hot, because it will be more bitter when it is cool. So in a cup of coffee, if you want to feel its sweetest state, the temperature should be close to the human body temperature (37 degrees Celsius).

What if you reheat it? Some friends who have used American trickling filter pots may ask, can reheating return to the original taste? The answer is no, as mentioned earlier, the process of coffee from heat to cooling is a process of volatilization of aroma substances, which is irreversible. So even if it is reheated, it will not change back to its original taste. Others asked, can I put the coffee in a thermos cup to keep warm? This question is to the point, specially for the previous street to do a test to see if the use of a thermos cup containing freshly brewed coffee can preserve its flavor. "the instruction manual of the insulation cup says it can be kept for 6 hours."

In front of the street, this time it is the rosy summer of Pokuet, Panama. Pour the freshly brewed coffee into the thermos cup and pour a cup every hour to taste the flavor. An hour later, there is still the aroma of jasmine, drink in the mouth can also feel slightly hot, taste the feeling and just come out of the feeling is not much different.

Two hours later, the temperature of the coffee changed, the rising jasmine fragrance was gone, there was a hint of brown sugar, it tasted good, the taste remained the same, and the taste was good. Three hours later, the coffee will still be angry as soon as it is poured out, and the temperature in the mouth is obviously lower than that of the human body (that is, it is cold). The taste becomes a little rough and the sour taste becomes obvious. Although the excellent performance of this bean does not have much negative taste after 3 hours, it is obviously very different from when it first rushed out.

Therefore, the insulation cup does work, and it may also be because the performance of the insulation cup is different, and it is inevitable that the data will deviate, but it is not a big problem to put it in a thermos cup for two hours.