How to store boutique coffee beans with roasting date correctly? What is the lost flavor oxidation of coffee beans?

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How to store boutique coffee beans with roasting date correctly? What is the reason for the loss of coffee bean flavor oxidation?

Don't judge coffee beans just because of the baking date, at least you need to open the coffee bag, evaluate it and have a chance to taste the coffee, but why isn't the baking date everything? What exactly does freshness mean? "which coffee is the freshest?"

If you are an industry, you must have heard this sentence many times. Many people who are reading this article may have asked this question, are you going to buy it as a gift, or will you drink it within a week? Choose coffee beans 4-7 days after roasting, which is usually defined as fresh coffee beans.

When is the best time to drink coffee after roasting?

Buying coffee beans is like buying bread. It only takes one week to buy enough. Find out the best coffee appreciation period (flavor peak), and then push back from the coffee you want to start drinking first, which can help you find the ideal baking date and find three to five days before and after that date. Usually if you want to buy coffee that you need to drink immediately, the author thinks it is best 8-21 days after baking. However, the store must make sure that the baker or barista uses the beans at the peak of the coffee flavor.

When freshly roasted coffee beans are heated, there will be a large amount of carbon dioxide inside the coffee beans, so the state of brewing and drinking can only be described as "unstable" (because when brewing, the water combines with the coffee powder, the violent gas in the coffee bean will affect the release of coffee substances from the water, resulting in a drop in coffee extraction.)

Need to rest for 1-2 days, discharge the excess gas, let the coffee flavor slowly stabilize before brewing. From the moment the coffee beans are roasted, the shelf life of the beans begins to count. generally speaking, after the baked beans are bagged, packaged and sealed, there will be a shelf life of about half a year in a dry and cool environment.

In the case of unopened, coffee beans can be preserved for about half a year, but once they are opened and used, they come into contact with a lot of air, the aroma begins to lose quickly, and the flavor is constantly oxidized. At this time, you are advised not to put it for half a year. It is best to drink it within a month from the day of Kaifeng. If you buy ground coffee powder, the area of exposure to air is much larger than that of coffee beans. The speed of deterioration is faster, and it is less durable to store, so the sooner you finish it, the better (some coffee shops, for fear of losing the flavor of coffee, refuse to grind coffee beans and sell them only to customers with bean grinders).

Three killers of coffee flavor loss:

1. Air:

Coffee beans themselves contain oil, the heavier the degree of baking, the more obvious the oil on the surface, once these oils come into contact with the air, they will oxidize, resulting in the stench of fuel consumption. Therefore, when preserving coffee beans, air must be avoided by every means. Sealed cans and vacuum cans are commonly used preservation containers in order to isolate the outside air. (it is recommended to seal the container with opaque light)

two。 Temperature:

The sources of heat are sun, light, fire, etc., no matter which kind of heat, it will accelerate the volatilization of aroma and the oxidation of oil, making the quality of coffee deteriorate faster, which is why the quality of coffee beans is easier to change in hot summer. In order to avoid quality deterioration caused by high temperature, be sure to choose a cool place where there is no sun, no one shines directly at close range, and avoid fire sources such as gas stoves to store coffee beans. (it is recommended to use a Polaroid box / moistureproof box and place it in a cool place)

3. Humidity:

The water content of roasted fresh coffee beans is very low, precisely because the water content of fresh beans is very low, so if the surrounding environment is relatively humid, coffee beans will become a hygroscopic agent, damp will lead to higher water content, coffee aroma and quality will be quickly lost.

How to preserve coffee beans correctly?

In fact, it is not difficult to preserve coffee beans at all. You can master the following principles:

1. After the opening of coffee beans, be sure to use sealed cans or clips to do sealing action, choose small packaging when buying, do not hoard beans, buy as much as you drink, and speed up turnover as much as possible.

two。 No matter whether the beans are opened or not, please put them in a cool, dry, ventilated place where there is no sunshine, light, temperature and humidity.

3. Coffee beans are just like other foods, no matter how well the preservation conditions are controlled, it is best to drink coffee beans as soon as possible, love should be timely!

When the third wave of coffee was on the rise in Singapore, boutique bean bakers tried to separate themselves from commercial bean bakers, focusing on slogans such as "small baking" and "Please look at the baking date rather than the expiration date". Although since then we have reduced the emphasis on freshness and marked in the beanbag: "it is best to drink / brew the coffee within a month after baking," the idea that the fresher the better, has been deeply rooted in the hearts of the people.

This is a very subjective topic. Many professional bean bakers set an average life span for coffee beans, and there are too many variables that we can't grasp. Coffee placed for a month tastes as good as coffee that has been kept for two weeks. But there are also coffee that has been roasted for only 11 days and lost its flavor. Coffee itself affects itself, and the methods of the bean baker can also change the characteristics of coffee, leading to differences in the peak or average lifespan of coffee. Some coffee with roasting techniques can allow the coffee to peak from 14 to 30 days after roasting, so it is difficult to tell before tasting that the coffee is past its peak or is too fresh to drink.

In order to elicit the best flavor of the old beans, you must correct and confirm the coffee grinding thickness and adjust the amount of powder used. The longer the beans are kept, the more holes there will be, which means that when you grind these coffee beans, they will disintegrate more easily, so that hot water can dissolve substances more easily. If the same grinding thickness is used to grind such old beans and fresh coffee beans, it may lead to insufficient extraction and make the brewed coffee untasty.