Glossary of terms for the composition of coffee beans

Caffeine: Caffeine is the most noticeable of all coffee ingredients. It belongs to a kind of plant xanthine (animal muscle component). Its nature is the same as theobromine contained in cocoa. The theophylline contained in green tea is the same. After baking, the percentage of reduction is extremely small. The effect of caffeine is extremely extensive, which will affect various parts of the human brain, heart, blood vessels, gastrointestinal tract, muscles and kidneys. An appropriate amount of caffeine will stimulate the cerebral cortex, promote sensory judgment, memory and emotional activities, make the myocardial function more active, expand blood vessels and enhance blood circulation. And improve metabolic function, caffeine can also reduce muscle fatigue, promote digestive juice secretion. In addition to this, because it also promotes kidney function to help the body expel excess sodium ions (chemical components that hinder water molecule metabolism), caffeine will not accumulate in the body like other narcotic and excitatory substances (narcotic drugs, paint solvents, stimulants, etc.), and will be excreted in about two hours. Coffee flavor in the biggest special burn-bitter, is caused by caffeine.

Tannin acid: After extraction, tannin acid will become pale yellow powder, which is easy to blend into water. After boiling, it will decompose and produce pyrochloric acid, which will make coffee taste worse. If brewed well and put on for several hours, coffee color will become thicker than just brewed, and it will not taste enough, so there will be a saying that "brewed well, it is best to drink it as soon as possible."

Fat: Coffee contains fat, which plays an extremely important role in flavor. Analysis shows that coffee contains fat divided into many kinds, and the most important of which is acidic fat and volatile fat. Acidic fat refers to fat containing acid. Its strength will vary according to different types of coffee. Volatile fat is the main source of coffee aroma. Roasted coffee beans contain fat which, when exposed to air, undergoes biochemical changes that make them less flavorful.

Protein: The main source of caroli is protein, and like coffee brewed by dripping, most of the protein will not dissolve out, so the nutrition obtained by coffee drinking is also limited, that is, coffee will become the reason for weight loss. The grinding of roasted coffee beans into powder is called grinding

The prop for grinding coffee beans is called a grinder.

It is said that Beethoven put 60 coffee beans into the mill every morning, grind them and brew coffee while grinding coffee and enjoying its aroma. Then enjoy it with gusto. Coffee beans grinding methods can be slightly divided into coarse grinding, medium grinding and fine grinding according to their size. Use appropriate grinding methods depending on coffee equipment. There is also a medium fine grind or a very fine grind finer than fine grind (into powdered coffee powder). And coffee beans grinding time is brewing coffee before, only the need for grinding is the top grade. Coffee beans are ground into powder and their surface area increases to absorb moisture and oxidize easily. In short, with the passage of time, coffee powder also plays a role in the deterioration of flavor damage. Also, after the ground coffee beans are placed, the carbon dioxide and aroma retained in the beans will be lost together. In this way, the coffee powder should expand and not expand when extracted and filtered, and no matter how it is, it cannot make delicious coffee. And the secret is to consider grinding consistently with the job, so that brewed coffee is the most delicious and mellow.

Fine grind

◎ Fine grinding (fine particles, the same size as sugar)

Medium grind

◎ Medium grind (grain size like sugar mixed with coarse sugar)

Regular grind

◎ Rough grinding (coarse particles, the same size as coarse sugar)

The secret to grinding coffee beans

Coffee beans are ground with grinding tools. Grinders range from manual for home use to large electric for business use. Household grinders can also be used as decorations, and if the number of people wants to grind once, it is still convenient to use electric grinders.

According to the structure of the grinder, there are grinders that use vertical and horizontal grooves to cut coffee beans and grinders that grind coffee with molars. Each has its own strengths, and the situation of business use is the trend of mass production of electric type as the mainstream.

However, the two most important things to note about grinding coffee beans are the following:

The friction heat is suppressed to a minimum. (Fragrance will scatter due to heat generation)

The size of the grains is uniform or not. (The particles are uneven, and the concentration of brewing will be uneven) For this reason, if it is a household grinder, rotate it gently manually, and be careful not to generate friction heat as much as possible. Therefore, it is more appropriate to use electric grinders.

How to use the mill

Grind beans before brewing

There are two types of household grinders: manual and electric. A small number of words with manual, and a large number of words with electric more convenient.

The grinding method (particle size) is determined by matching with the bubble extractor.

Manual grinders should be careful not to generate frictional heat only. And be careful if you mix anything else. After grinding coffee beans particles large neat or not, to check. (If the particles are uneven, it is possible that the function of the grinder is always the same, or the coffee roasting is uneven.)

Coffee grinding

In the Middle East, beans were still ground into particles of various sizes, but when most people had come to use bean grinders, Bella Sawarin himself made an experiment to find out whether ground or ground coffee was better, both for public trust, and invited food critics to taste the two kinds of coffee. Finally, it was agreed that ground coffee was more fascinating than ground coffee.

To grind a satisfactory coffee powder, it is really very simple, as long as you try a few times to find your favorite flavor, in fact, there is no certain standard. But generally speaking, too fine ground coffee powder (powerdered) aroma is easy to run away, more suitable for fresh ground drink.

The coffee powder (very fine) is used when using electric coffee pots, because the coffee made from fine coffee powder is more, the general company line number, or the restaurant's side drinks are more used.

Then there is fine, which is about the size of granulated sugar, and the dripping cooking method is very suitable for this kind of thickness.

Medium (medium), granular coffee powder in the brewing amount is not much, have to put more coffee particles to do, but also boiled coffee is more fragrant, some coffee pots also want to use medium coffee powder, because too fine powder will fall into the sieve plate, but the pot of water needs more than 10 minutes to cook a pot of coffee and the amount is not much, can be said to be the most economical particles. There are many kinds of machines for grinding beans, among which the most common is the electric bean grinder for family use, which can grind particles of different sizes, small and light, and the price is not very expensive. It is a good choice for families or when there are few people.

Manual bean grinder is the kind of coffee shop, looks ancient, very poetic that kind of, even if not used as a decoration to grind beans is also very beautiful, but this one grinds out the particles are relatively large, and the speed is also relatively slow.

Coffee shop with professional electric grinder can grind out a variety of different thickness of particles, speed, weight is the advantage of this grinder.

Many new Espresso coffee machines are equipped with the function of grinding beans, but the risk is that it may not be able to meet your requirements, how to choose, all depends on the consumer's choice.

Espreeso uses air pressure brewing, the whole process only takes 20-25 seconds, in such a short time, coffee essence can be properly extracted, powder particle thickness is very important. If the powder is too fine, the area of vapor penetration will be relatively large, which will cause excessive extraction, thick and not fragrant. Coarse grains, low resistance, coffee becomes thin, creme orange. Therefore, it is better to purchase a bean grinder with a fine-tuning function. Cheap bean grinders are constructed like household multifunctional mixers, with windmill-like blades, square beans after grinding, which is not conducive to extraction. Using circular saw blade machines, beans will be irregular, wide contact surface, although the unit price is higher, but still worth it. (This article is reproduced)