Cold Brew Coffee should last you for around two weeks once it’s stored in the fridge using an airtight container.
5 Tips To Make Your Cold Brew Coffee Last Longer
1- Make a Cold Brew Concentrate
Cold Brew Concentrate is where you make a highly concentrated coffee syrup using a ratio of around 1 part coffee to 2 parts of water.
Water is then added to the concentrate till
By making and storing your cold brew as a concentrate instead of making batches of cold brew coffee you reduce the amount of water inside which slows down the microbes thus helping to make your cold brew last longer.
2- Use an Air Tight Container
If you store your cold brew inside an airtight container this would significantly increase how long your cold brew should last for.
This is because of two reasons;
- The lack of Oxygen slows down the oxidation of the coffee’s compounds.
- And helps to starve microbes that need oxygen to live.
An airtight container refers to a container that is sealed so as to not allow air to flow freely.
A simple mason jar should suffice or for larger quantities ensure the container is tightly corked.
Also, avoid constantly opening the container containing the cold brew this allows more air to flow into the coffee.
Now if you want your cold brew to last longer think roughly 3 weeks or more you can use a vacuum to suck the air out from inside the container which would dramatically increase how long your cold brew coffee would last.
By vacuuming out all the air won’t make the brew last forever, oxidation would still happen, this is because the water itself has oxygen which would oxidize the compounds in the coffee, it would buy you more time.
For this, you would need, see below for the items you would need you can click to see the price of each item on Amazon;
Just remember to vacuum out the air every time you open your lid since every time you open more air will enter. You can see how it is done in the video below.
3- Store Your Cold Brew in The Fridge
By storing your cold brew in the fridge would slow down the rate of metabolism of the microbes inside your cold brew thus decreasing their multiplication and production of toxins.
The colder the better, just avoid freezing your cold brew, what freezing does is that it separates the water from the coffee and gives it a watery taste.
4- Avoid Adding Any Additives to Your Cold Brew
When storing your cold brew for a long period of time avoiding adding any additives such as sugar, spices or milk.
These additives work as food for the bacteria which speed up the rate of spoilage of your cold brew.
5- Know Your Limit
Only make the amount of cold brew that you estimate that you would use keep in mind the two-week rule and you should be fine.
If you know you are gonna drink 2 liters of cold brew within two weeks just make 2 liters of cold brew.
Why Does Cold Brew Coffee Go Bad
There are two main reasons why cold brew coffee would go bad:
1-Oxidation / Interaction With Air
Oxidation is the process whereby a compound bonds with oxygen, this process changes the compound, a good example of this is when you cut an apple how it quickly goes bad.
Now when the compounds in coffee are allowed to bond with the oxygen it slowly oxidizes them and thus degrades the coffee’s taste over time.
2-Microbes or Bacteria
Microbes just need water, air, and food to survive and thrive now Cold Brew Coffee has all of these elements so over time bacteria and mold would start to multiply inside your cold brew coffee.
These microbes release toxins which make the cold brew go bad. If you want you can add preservatives to kill the bacteria but this would also alter the taste of the cold brew.
How Do You know When Your Cold Brew Coffee Has Gone Bad
The main way you can tell if your cold brew has spoiled is by tasting it, now if it has spoiled it would have an unusually harsh taste, also if even time has passed it might even develop a putrid scent.
Now after one week even if your cold brew is stored in the fridge using an airtight container its still gonna start to slowly lose its taste.
How Cold Brew Coffee is Preserved for Extra Long Period in Cans
There are two main things that are added to cold brew to preserve it in the can, they are:
- Preservatives these are chemicals that are added to preserve the cold brew usually by killing the microbes, usually, they alter the taste of the brew and are usually used for commercial purposes only
- Nitrogen Gas is dissolved in the cold brew coffee when they are stored in the cans, nitrogen helps to slow down the oxidation of the coffee and preserves the taste.