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

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

Smell: put the coffee beans close to the nose, smell deeply, whether you can clearly smell the aroma of coffee beans, if so, it means that the coffee beans are fresh enough. On the contrary, if the aroma is weak, or if the smell has begun to appear greasy (such as peanuts or nuts will appear for a long time), the coffee beans are not fresh at all. No matter how much effort you put into grinding and cooking such coffee beans, it is impossible to make a good cup of coffee.

Look: spread the coffee beans on your hands, determine the origin and variety of coffee beans, and determine whether the coffee beans are roasted evenly.

Peel: take a coffee bean and try to peel it off by hand. if the coffee bean is fresh enough, it should be easy to pull away, and it will have a crisp sound and feeling. If the coffee beans are not fresh, you will find that you have to work hard to get rid of a bean. Another important point to observe when peeling off the coffee beans is to see if the firepower is uniform when baking. If it is uniform, the outer skin and inner layer of the beans should be the same color. If the color of the surface layer is obviously much darker than that of the inner layer, it means that there may be too much firepower during baking, which will also affect the aroma and flavor of coffee beans.

Matters needing attention in the purchase of coffee beans

To start buying coffee beans, first choose a coffee shop where business is booming. The freshness of roasted beans is the life of coffee, so choose to put fresh coffee beans in the warehouse, the place is clean and there is no oil residue on the beans, and there is no direct sunlight and no hot shops around. It is also a good way to buy in your own baking shop where you think you are fragrant and mellow.

When buying baked beans, you can specify the refreshing beans, hoping to drink some slightly sour ones, with a strong bitter taste, or directly tell the clerk to choose for your preferences.

When buying rear care shop grinding, be sure to inform the manager of the coffee making utensils used to match those props grinding (such as electric coffee maker, filter, paper, siphon, etc.).

When buying canned coffee powder in the supermarket, choose the label (the type of beans or the tendency to taste, etc.), depending on what you like.

The secret of coffee bean preservation

Roasted coffee beans are easily oxidized by oxygen in the air, which deteriorates the quality of the oil, volatilizes and disappears, and then deteriorates quickly through temperature, humidity, sunlight and so on. Especially after multi-layer treatment of low-caffeine coffee beans, oxidation is carried out faster. Therefore, in order to maintain the aroma and quality of coffee, how to package and preserve coffee beans has become a great knowledge.

Coffee beans produce three times the volume of carbon dioxide after roasting, so the packaging of coffee mainly needs to deal with the carbon dioxide produced by coffee beans in addition to avoiding contact with air oxidation.

Gaseous packaging

In the most common packaging, beans and powder are packed in empty cans, glass, paper bags or plastic containers, and then sealed or sealed. Low preservation, and due to constant contact with the air, need to drink as soon as possible, drinking period is about a week.

vacuum packing

The packing container (can, aluminum foil bag, plastic bag) draws out the air from the container after filling the coffee. Although it is called a vacuum, it actually removes at most 90% of the air, and the surface area of the coffee powder is larger than that of the coffee beans, and even the remaining air can easily combine with the powder to affect the flavor.

Gas filling packaging

A pinhole is designed on the metal bag. After filling the coffee, inactive nitrogen is poured into the bag and the carbon dioxide pinhole is squeezed out. This method is more popular, but after all the gas is discharged, the oxygen is quietly drilled back into the bag from the pinhole. Gas absorbent packaging will be made of deoxidizer, decarbonization made of absorbent into the bag, the air in the package can be easily absorbed, and the carbonation produced by coffee can also be inhaled, but the aroma of coffee will also be sucked away is its disadvantage.

UCC Asia Rome Packaging

At present, it is the most ideal outer packaging of coffee, all in the shape of beans rather than powder. It is similar to the pinhole metal bag, except that the gas in the bag can be discharged through the pinhole, while the unidirectional piston can prevent the oxygen from entering the bag.

Immediately after the beans are roasted, the coffee manufacturers cool and pack the beans and pour nitrogen into the bag, which has discharged the gas from the bag. Although this kind of packing method is ideal, but the material is expensive, the cost is high, at present only the selected coffee of large companies will use this kind of packaging method.