Bananas can be kept fresher for longer by wrapping their stems in tin foil, a simple storage trick that slows down the ripening process. This method traps ethylene gas, a natural plant hormone that accelerates ripening, thereby preventing the fruit from turning brown too quickly.
Why Bananas Turn Brown
Bananas typically last between two and six days at room temperature, depending on their ripeness at purchase. Once fully ripe, they begin to brown rapidly, and warmer conditions, such as summer heat, can speed up this process. The ethylene gas released from the stems causes starches to convert into sugars and breaks down cell walls, leading to the color and texture changes.
The Tin Foil Solution
By wrapping the stems in tin foil, the ethylene gas is trapped, slowing ripening and extending shelf life. Food Republic, in its online advice, explains: “Compared to other fruits and veggies, bananas are one of the biggest producers of ethylene gas, a natural chemical compound that promotes ripening. The majority of this gas is released through the exposed stem of the fruit, which allows a bunch of bananas to continue ripening even after it's picked from the tree. Wrapping the top of your bunch with aluminium helps to trap in some of the ethylene, so it won't escape into the atmosphere and touch the body of the bananas (or other produce you have sitting nearby, for that matter). This slows down browning and gives you more time to enjoy your bunch.”
Alternative and Additional Tips
If tin foil is unavailable, cling film works just as well, and both typically cost less than £2 at most major supermarkets. It is also advisable to store bananas away from other fruit, as the ethylene gas can cause nearby fruits like apples, pears, and passion fruit to ripen more quickly, though citrus fruits are unaffected. Experts recommend hanging bananas on a banana hook to keep them separate and prevent bruising.
