Basic knowledge of Coffee Why some Coffee tastes sour

How to make the best coffee at home?

A: About brewing coffee knowledge, according to a coffee shop business person in charge said, to be able to fully grasp. Interpretation of the essence of coffee, at least after a year of complete professional training, and currently there is no such training environment, if you want to brew a cup of instant coffee at home, the following has a small secret recipe for you, first put a little warm milk into the pot, and then add the right amount of coffee powder and boiled water (The proportion is about 3g coffee powder plus 140c.c boiling water), heat to a slight boil (note not to boil completely), immediately turn off the flame, and then add sugar according to personal preference. This way, the peculiar smell of instant coffee can be eliminated by the milk at the bottom, and the coffee is more fragrant.

2 How to buy coffee beans?

No matter what kind of coffee beans, freshness is an important factor affecting quality. When purchasing, grab one or two coffee beans in the mouth to chew, if the crisp sound (indicating that the coffee beans are not wet), the teeth cheek fragrance is the top grade, but it is best to pinch with your hand, feel whether it is solid, rather than buy empty coffee.

If the coffee beans have lost their aroma or smell old, it means that the coffee beans are no longer fresh and are not suitable for purchase.

Freshly fried coffee beans are not suitable for immediate drinking and should be stored for a week in order to completely release the gases in the beans.

Generally speaking, the best drinking period of coffee is one week after frying, when the coffee is the freshest and the aroma (Aroma) tastes the best.

In addition, the purity of coffee beans is also another consideration factor, experts choose coffee, not necessarily to see the size of the particles, but to grab a handful of coffee beans (Regional Coffee), about dozens of weight, to see whether the color of each single bean is consistent, particle size, shape is similar, so as not to buy mixed beans disguised as inferior products. However, if it is a blended coffee, the size and color are different. In addition, heavy fire and medium and deep roasting method will cause coffee beans to be oily, but if the beans are lightly roasted, it means that they have deteriorated, not only the degree of fragrance is reduced, but also astringent and sour. In short, when buying coffee, we should pay attention to its freshness, aroma and old taste, and the ideal purchase quantity is half a month to drink up.

Why does coffee taste sour?

Coffee will drink acid, mostly due to the variety of coffee, some coffee itself higher acidity, such as: Kenya (Kenya), Mocha (Mocha), Colombia (Colombia), Guatemala (Guatemala) and Costa Rica (Costa Rica) and other varieties.

The degree of roasting is also related to the acidity of coffee. Usually, the coffee beans that are lightly fried also contain organic acids, so the coffee that is rushed out is more acidic to drink; while the coffee beans that are deeply fried are released because the organic acids contained in the coffee beans have been released at high temperatures, so the coffee acidity that is rushed out is low. Too much stirring during brewing (especially when brewed with a "plug") or too long for the brewed coffee to stay on the hot plate are causes of sour coffee.

Can pregnant women drink coffee?

Answer: In 1980, the US Food and Drug Administration ( FDA) issued a statement advising pregnant or potentially pregnant women to reduce caffeine intake; However, many studies have since shown that there is no evidence that moderate amounts of caffeine will adversely affect the fetus, and there is no medical report prohibiting pregnant women from drinking coffee. However, the FDA has not changed its original advice because pregnant women metabolize caffeine about twice as fast during the second and third periods of pregnancy as they do before pregnancy. Moreover, caffeine can also cross the placenta into the fetus and flow into the baby's body through breastfeeding. Pregnant women and parturient women are advised to be more cautious about caffeine intake.

5. Does coffee cause calcium loss?

Answer: As for the relationship between caffeine intake and osteoporosis, there is no direct evidence that caffeine causes osteoporosis, but some studies have pointed out that caffeine increases calcium excretion, so the current recommendation is that coffee lovers should eat more foods high in calcium to supplement calcium, if you can drink milk before drinking coffee, It can also reduce the loss of calcium in the body.