The carbon dioxide is replaced by oxygen more quickly, which in turn can cause the coffee to go stale more quickly. When coffee is ground into smaller pieces, the ratio of surface area to volume for each smaller piece becomes much greater, and the surfaces also become more porous. This starts a process called oxidization, which breaks down the flavour of the beans and affects how long the ground coffee will last. Once the roasted beans have emitted most of their carbon dioxide, oxygen seeps in and interacts with oils in the beans. One of the reasons whole bean coffee stays fresh longer is related to the degassing process. What happens to coffee after it’s ground? The same study determined that after eight days of storage, methanethiol had decreased by 70 per cent! Needless to say, you’re fighting an uphill battle against stale coffee. It is important to seal the coffee beans properly in order to keep them fresh for as long as possible.Ī 1992 German study found that coffee’s most intense aroma notes come from just two compounds within the roasted bean: methanethiol and 2-methylpropanal. Until then, they’re still shedding that carbon dioxide. The beans aren’t ready to be ground and brewed for at least 24 hours after roasting, and many experts believe they aren’t at their best until about four days later. Some companies include a QR code on the bag, so you can go online to find out how long those beans have been around.Īfter coffee is roasted (if you haven’t roasted your own coffee before, you should try it), it begins a process called “ degassing,” in which the beans release carbon dioxide. You’ll want to make sure the coffee you’re buying lists a roast date, which indicates when the raw green coffee beans were transformed into their dark and aromatic form. Whether you are buying whole beans or ground coffee, it’s important to pay attention to the date on the packaging. Whole beans do require an extra step each morning, as well as some know-how for getting the beans to the right consistency, but the flavour of the resulting fresh coffee makes it worth it. Whole coffee beans retain their aroma and flavour longer than ground ones, which allows you to buy and store larger quantities, and you can take a bit more time to get through an open bag of beans. Whole coffee beans are a little more work in the morning, but the freshness can make it worthwhile. However, pre-ground coffee tends to take a hit on flavour and freshness, especially when compared to whole beans. You don’t have to invest in a coffee grinder and risk grinding the beans incorrectly, which could interfere with the flavour of your morning cup. You save time in the morning by simply pulling out a bag of ready-to-brew grounds. Pre-ground coffee is the most convenient option for brewing at home. Whole beans stay fresh longer than ground coffee Here are our tips for extending the shelf life of your coffee for as possible. In 1992, scientists in Austria had experts taste vacuum-sealed coffee that had been stored in the dark at ideal temperatures. However, good storage doesn’t solve everything. Ground coffee will not last as long as whole beans, which can still be quite good after two months if stored in an opaque, airtight container. Coffee grounds stay fresh for a week or two-several weeks if properly stored where oxygen, light and moisture cannot get at them.
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