Sliced avocado can stay fresh and green for at least two days when wrapped tightly in cling film, as the plastic limits the fruit’s exposure to air and slows the browning process.
Avocados that have been cut are prone to browning due to a natural enzyme called polyphenol oxidase, which reacts with oxygen. Proper storage can prevent this reaction, according to food experts.
How cling film works
Food website Food Matters explains: “If we’re trying to prevent the oxidization of the avocado, cling film is a great choice. While it’s not entirely foolproof, and the use of single-use plastic is a growing burden on the environment, it’s a quick and easy option.”
“Simply wrap the avo nice and tight (and that part is key) in the cling film of your choice. If you’re looking for a more sustainable option, try a reusable beeswax wrap.”
The method also works for guacamole. Food Matters adds: “It is important to mention that this method proves quite successful for keeping guacamole fresh for a longer time. When storing it, gently press the wrap down onto the surface of the mixture in a bowl or container to remove all of the air, and you’ll have fresh guac for days.”
Extra tips for freshness
It is also recommended that the wrapped avocado is placed inside an airtight container and put in the fridge, as the cold temperature helps the fruit stay greener for longer by inhibiting the enzymes that cause oxidation.
Adding a squeeze of lemon or lime juice before storing can also help. These fruits contain citric acid, an antioxidant that inhibits polyphenol oxidase, the enzyme that produces the brown pigment when it reacts with oxygen. Brushing the flesh with the juice creates a barrier that keeps the fruit fresh and green, although it can slightly alter the flavour.
Experts at Real Simple add: “If the avocado is already sliced, your best course of action is to grab a food storage container. However, instead of using the corresponding top, cover the container with plastic wrap, making sure the wrap comes in direct contact with the avocado and there are no air pockets. This will help prevent oxygen from getting in and turning your bright green avo flesh brown.”
