Coffee encyclopedia freshness is the life of coffee

Freshness is the life of coffee.

There are three steps to determining the freshness of coffee beans: smell, look and peel.

Smell: close the coffee beans to the nose, deeply smell, is it possible to clearly smell the aroma of coffee beans, if it is, the coffee beans are fresh enough. Conversely, if the aroma is weak, or if it has begun to smell greasy (like peanuts or nuts), it means that the coffee beans are completely stale. Such coffee beans, no matter how much effort you spend to grind and boil, it is impossible to cook a good cup of coffee.

See: Spread the beans out on your hand to determine the origin and type of coffee beans, and also to determine whether the beans are roasted evenly.

Peel: Take a coffee bean and try to peel it with your hand. If the coffee bean is fresh enough, it should be easy to peel it apart, and there will be a crunchy sound and feeling. If the coffee beans are stale, you may find that it seems like you have to struggle to separate a bean. There is another important point to observe when peeling coffee beans, that is, to see if the fire is even when roasting. If uniform, the color of the outer and inner layers of the beans should be the same. If the color of the outer layer is significantly darker than the color of the inner layer, it means that the heat during roasting may be too high, which will also affect the aroma and flavor of the coffee beans.

Coffee beans purchase considerations

To start shopping for coffee beans, first choose a coffee shop that is booming. The freshness of roasted beans is the life of coffee, so choose the warehouse where fresh coffee beans are placed, the place is clean and there is no oil residue on the beans, and there is no direct sunlight and no high temperature around the store. There is also a good way to buy at a store that thinks it is fragrant and mellow.

When buying baked beans, you can specify the refreshing beans yourself. If you want to drink some slightly sour beans, the bitter ones are better, or you can tell the clerk to choose for your preference.

When purchasing after-sale grinding, be sure to inform the store manager of the coffee brewing equipment used, etc., in order to cooperate with those props grinding (such as electric coffee machine, filter, paper, siphon, etc.).

When buying canned coffee powder in the supermarket, choose the label (bean type or taste tendency, etc.), depending on your preference.

Coffee bean preservation tips

Roasted coffee beans are easily oxidized by oxygen in the air, which makes the oil contained deteriorate, the aroma also volatilizes and disappears, and then accelerates deterioration through temperature, humidity, sunlight, etc. In particular, the oxidation of decaf coffee beans, which have been treated in multiple layers, proceeds faster. Therefore, in order to maintain the aroma and quality of coffee, how to package and preserve coffee beans has become a university.

Coffee beans produce three times the volume of carbon dioxide after roasting, so the packaging of coffee is mainly to avoid contact with air oxidation and to treat the carbon dioxide produced by coffee beans.

gas-containing package

The most common packaging, with empty cans, glass, paper bags or plastic containers to package beans, powder, and then cover or seal packaging. Low preservation, and because of constant contact with the air, need to drink as soon as possible, drinking period for about a week.

vacuum packaging

Packaging containers (cans, aluminum foil bags, plastic bags) After filling with coffee, the air inside the container is evacuated. Although it is called vacuum, in fact, at most 90% of the air is removed, and the area of coffee powder is larger than the surface area of coffee beans, even if it is the remaining air, it is easy to combine with the powder and affect the flavor.

gas-filled package

A pinhole is designed on the metal bag. After filling the coffee, inert nitrogen is injected to squeeze out the carbon dioxide pinhole in the bag. This method is more popular, but after all the gas is exhausted, the oxygen will silently drill into the bag from the pinhole. Gas sorbent packaging will be made of deoxytin, decarbonization sorbent into the packaging bag, the air in the package can be easily absorbed, and the carbonic acid gas produced by coffee can also be inhaled, but the aroma of coffee will also be sucked away is its disadvantage.

UCC Rome Packaging

The most ideal coffee packaging at present, all in the form of beans rather than powder packaging. It is similar to a pinhole metal bag, except that the gas inside the bag can be exhausted through the pinhole, and the one-way piston can prevent oxygen outside the bag from entering the bag.

Coffee manufacturers cool the beans immediately after roasting and pack them with nitrogen gas to vent the gas. Although this packaging method is ideal, but the material is expensive, high cost, currently only the selection of coffee companies will use this packaging method.