Quick look! The most scientific guide to the purchase and preservation of coffee beans

Still buying ground coffee powder? Are you scared when you see the coffee beans on the shelf? I can't drink it all at once when I buy it home. How can I keep it?

Drink good coffee, start with buying and using beans!

The purchase and storage of coffee beans has always been a difficult task to explain in words, but try to explain it to you today:

1. What should I pay attention to when buying coffee and ripe beans?

2. How should coffee beans be stored after they are bought home?

3. How to choose and buy raw coffee beans?

I.

How to buy good coffee and ripe beans?

The first consideration for buying coffee beans-fresh

Like vegetables and fruits and all kinds of meat, coffee beans are alive, and freshness, freshness, and freshness are its top priority.

Just imagine, will mothers buy a month's worth of food? Of course not, it must be the same day, or only for a day or two. The same is true of coffee beans. You should buy as much as you want instead of buying a lot of them.

So how do we make sure the coffee beans we buy are fresh?

Soybean cultivation period and the best drinking period

The best drinking period of coffee beans is about 7 ~ 30 days after baking. The first seven days are called bean cultivation period, which varies according to different coffee beans and different roasting methods. You can ask the cafe what is the most suitable bean cultivation period.

Picture: coffee flavor changes with time after roasting

Therefore, when buying coffee beans, you need to ask the shopkeeper about the date of baking, and only buy the amount that can be finished within a month from the date of baking.

Appearance of coffee beans

Don't buy glossy beans!

There are two conditions that make coffee beans shiny: they are deeply roasted and the beans are kept for too long. Baking too deep will lose the flavor of the place of origin; if the beans are kept too long, of course they will not taste good!

Brewing mode and baking degree

In addition to espresso, such as hand-brewed coffee, siphon pot, French pressure, love pressure, smart cup, etc., there is no saying that certain instruments are particularly suitable for certain coffee beans, so there is no need to worry about the problem that coffee beans must be matched with brewing methods.

And if you brew espresso at home, it's best to make it clear to the store, because espresso usually needs to be roasted a little deeper than hand-brewed coffee.

Packaging and labeling

For coffee beans to be properly preserved for a month, a low-oxygen, dry, low-temperature and low-light environment is required.

At present, cafes generally use aluminum foil composite packaging, plus an one-way exhaust valve. Because the coffee beans are just roasted and will begin to emit a large amount of carbon dioxide, one of the functions of this exhaust valve is to release the carbon dioxide to prevent the bean bag from breaking, while keeping the outside oxygen from entering the bag, thus oxidizing the coffee beans, resulting in the loss of flavor.

If the bean bag itself has a zipper after opening, be sure to vent the air as much as possible, and then zip it up. If there is no zipper, you must fold the belt a few more and then hold it with a clip to avoid air circulation as much as possible.

On the label, you should pay attention to whether there are a variety of instructions to tell you the resume of the origin of this coffee bean, production process, production time and so on. Although the more detailed it is, it doesn't necessarily mean that it tastes better, but it's more likely to taste good than those with nothing or a bunch of emotional articles! And you can remember that the coffee you drink is Xena Manning and Valmar Manor Guatemala, not just Indonesia or Guatemala.

The next time you buy, you can directly tell the seller what kind of coffee I want ~ you can directly say the name of the manor coffee beans, I think it is a very cool thing!

Try it.

If you don't provide a test suit, you'll be playing hooligans. Everyone has their own taste preferences, origin, baking degree will have an impact on the taste.

For example, Mr. Cha likes the rich acidity and the unique flavor of the place of origin, so he will choose light-roasted coffee beans.

Bean baking equipment and other

For some very detailed and trivial points to pay attention to, you can ask the store more to know more about the production process of coffee beans. For example, what equipment they use. It's not that I don't like the domestic roaster, but the stability of the current domestic roaster is not good enough, so it is difficult to produce every batch of coffee beans with similar flavor.

How to control the quality and what steps and records the store has done are also the focus of the inquiry.

II.

How to take care of the coffee beans bought home

Buy coffee beans and grind them at home.

Teacher Cha stressed again and again: don't buy ground coffee, it will oxidize and lose flavor too quickly. Isn't that a waste of our previous efforts to choose coffee beans?

Tightness of containers

If you choose to save in a jar, be sure to use a fully sealed type.

What is more noteworthy is that do not use ziploc chain bags. Because all plastic materials are highly breathable. That's right! There is no doubt that the air permeability of aluminum foil is very poor, which is why most snacks and coffee beans are packaged with aluminum foil composite layer, because the air permeability is low, the rate of moisture oxidation of food will be very low! )

Put it in the refrigerator.

Can you put the coffee and cooked beans in the refrigerator? no way? Who said, you come out, I promise I won't hit you!

Of course, you can put it in the refrigerator, and the lower the temperature, the longer you can keep it! But there are two key points: 1. The packing should be absolutely sealed. 2. do not open the package until you return to room temperature (otherwise the surface of the coffee bean will condense water in the air and is extremely susceptible to moisture).

3.

Purchase and storage of raw coffee beans

After talking about cooked beans, let's take a look at the raw beans that few people will pay attention to.

The year of raw beans

Coffee beans are called raw beans before they are roasted. Compared with ripe beans, the flavor loss of raw beans is slower. However, it does not mean that raw beans can be stored indefinitely. The fresher the coffee beans are, the richer the flavor of origin will be.

Therefore, we also hope to get raw beans from the origin within a year of production.

Packaging of raw beans

Packaging also affects the speed of flavor loss, and the best way to preserve flavor is as follows:

Vacuum packing > GrainPro patented plastic bags > linen bags

Vacuum bags and GrainPro are not too affected by the environment before opening (they are like sacks after opening), so just don't go too far in the storage environment. However, if the sack, because of its permeability, coffee beans will change very quickly, so there are corresponding requirements for the environment of the warehouse.

Storage condition

The best storage environment is a warehouse with a relative humidity of about 70% and a lower temperature.

Why 70% relative humidity? In order to maintain the activity of the cells in the raw coffee beans, so as to prevent the flavor from decaying too quickly due to the death of the cells, the coffee beans will eventually reduce the moisture to about 1011%. The relative humidity of 70% is exactly equal to 10% to 11% of the water content in raw beans, so the rate of water flowing in and out of raw coffee beans will be the same, thus keeping the moisture content of raw coffee beans at 11% all the time.

But do you think the story ends here? Since the raw coffee bean is alive, it will continue to consume energy, so some of the flavor substances in the raw coffee bean will deteriorate because of oxidation, and some will be converted into other substances because of the metabolic consumption of the cell itself. Is it hot? what's so magical about vacuum and GrainPro? In short, these two preservation methods will make coffee beans go into dormancy, the less oxygen content around them, the less the amount of raw bean flavor substances deteriorated by oxidation, and the faster the coffee beans enter dormancy, after dormancy, the overall metabolism will become very slow, so the coffee raw beans can be better preserved.

What about the last factor, temperature?

Basically, the lower the temperature, the better. What? Is it all right below zero? Of course, it's just that if you want to store raw coffee beans below zero, you can only use vacuum packaging, and you have to get the raw coffee beans back to room temperature before opening the package. Otherwise, the coffee beans will be damp and the flavor will be greatly affected.

To sum up, there are only a few key points in the selection of coffee beans.

1. Fresh, whether it's raw beans or cooked beans.

1. Raw beans are used within a year and coffee beans are drunk within a month.

two。 Save! Oxygen insulation, moisture insulation, away from high temperature

3. Clear production and marketing resume

4. The boss is handsome!