But scientists are developing a way to extend the life of ripe bananas. It's spray-on coating made from chitosan, substance found in crab and shrimp shells. The new gel can sprayed on bananas to slow the ripening process by up to twelve days. 

 

Like other fruit, bananas remain alive after being picked and actually continue to respire. This means that they take oxygen and release carbon dioxide. The more the banana breathes, the faster it ripens and then rots. Bananas ripen more quickly than most fruit because they don't naturally slow the respiration after being picked, in fact it speeds up, causing bananas to become mushy. 

 

Chitosan not only kill the bacteria on banana's skin that leads to rot, it also significantly slows down the respiration in the first place. So bananas won't drive you bananas.