How to store coffee beans for a longer time

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"buying a bean grinder is better than buying a bag of high-end coffee powder. Lin Zhe-hao, a certified appraiser of the International Coffee quality Association, advises coffee lovers to buy their own roasted coffee beans and store them at home, and it is best to grind and brew their own beans, and keep them as short as possible.

There are three factors that affect the preservation of coffee beans: temperature, humidity and oxidation rate.

Lin Zhe-hao suggested that if you want to taste good coffee, you'd better buy freshly roasted coffee beans. One to two weeks after roasting will be the best time to taste coffee. Put it for a month at most. The longer it is stored, the more easily it will oxidize and lose taste, and even the smell of fuel consumption. The flavor is relatively not so good.

NG behavior 1: put coffee beans in transparent sealed cans and expose them to light.

Freshly baked beans must be stored in a cool place. The aroma molecules of ground coffee are easy to volatilize, and the preservation length of coffee is related to packaging technology. at present, the common packaging is sealed bag or one-way exhaust valve bag, one-way exhaust bag can slow down the speed of oxidation.

Similarly, some people are used to putting coffee beans in sealed cans, and opaque cans are better than transparent ones, avoiding light exposure and slowing down the volatilization and oxidation of aromatics.

NG behavior 2: put coffee beans in the refrigerator to avoid mildew

In addition, coffee beans should never be kept in the refrigerator, whether refrigerated or frozen.

The reason is that when you take coffee beans out of a relatively low temperature refrigerator, there is a difference between the room temperature and the temperature in the bag. The moisture will attach to the surface of the bag. After opening it, the moisture will enter again, but the moisture will return to the refrigerator. If you want to put it in the refrigerator, it is best to use it separately. One pack is the amount used at one time.

NG behavior 3: buy beans that smell like fuel consumption

To see whether the beans stored in the coffee shop are fresh, you can see whether there is a layer of oil attached to the transparent container, while the deep-roasted coffee beans will have a glossy gloss, which will dry out for a long time, while the shallow-roasted coffee will run out after a long time. Fuel-guzzling coffee also means it has been stored for too long.

In addition, the freshness of coffee beans can be observed by hand: when the coffee is relatively stale, there are fewer bubbles and the coffee powder will sink, because the carbon dioxide in the beans volatilizes faster after grinding, the oxidation rate increases, and the structure changes. The amount of bubbles floating during water injection is relatively small.

After grinding, the filter bag of coffee is more likely to see the collapse.

From post-processing to transportation and preservation of coffee beans, high temperature and humidity is a hotbed for ochratoxin A, which can also be produced during the transportation of imported corn and soybeans. Han Huizong, author of Coffee, stressed: "you won't see ochratoxin An on coffee. Toxins are things that mold grows and metabolizes, and eating mold won't kill you. "

Generally speaking, most of the raw coffee beans for commercial use are stored and transported from Central America to Japan, and then come to Taiwan for a while. It will take about two to three months. If the temperature is higher at the bottom of the cabin near the motor, ochratoxin An is easily produced. If it is no problem to be transported, it is also easy to get damp when stacked in the warehouse in summer.

If you want to buy reassuring coffee beans, you can find a store from the neighborhood and communicate with the owner of your own baking shop.

The density of Taiwan's own bakery is one of the highest in the world, and it is relatively convenient to choose freshly roasted coffee beans. "compared with a large number of foreign baking manufacturers importing packaged coffee beans, the more fresh beans provided by small roasters with high turnover," Lin says.

Save coffee beans Tips:

1. Choose small packages when you buy, don't hoard beans, buy as much as you drink, and speed up turnover as much as possible.

two。 The storage period of roasted coffee beans is no more than one month.

3. It is better to keep bean bags in one-way exhaust than in compressed jars. Opaque jars can be kept in a cool place.

4. If you want to put it in the refrigerator, please pack it in separate bags and separate portions for one drink.

Noun Dictionary

Ochratoxin (Ochratoxin A)

It is the secondary metabolite (Secondary metabolites) secreted by Penicillium and Penicillium, which has nephrotoxicity, immunosuppression, carcinogenicity and so on. It belongs to class 2B carcinogens.

The Food and Drug Administration (FDA) order No. 1021350146 amends the limit of mycotoxin in food to set the limit of ochratoxin An in roasted coffee beans and coffee powder below 5 ppb, which is the same as that of the International Codex Alimentarius Commission (Codex), the European Union and China.

In order to guard the food safety of the public, the Food and Drug Administration tested a total of 87 roasted coffee beans and coffee powder from January to July 104, all of which were free of ochratoxin An exceeding the standard.