Lemon Juice

• The juice of a fresh lemon, squeezed into a bowl, provides the perfect bath for freshly cut bananas. Once the juice is in the bowl, slice the banana directly into the liquid. Toss the slices with a slotted spoon to coat them; dip them out and add them to a fruit salad or other recipe.
  
  

Pineapple Juice

• If you're making a fruit salad, canned pineapple in its juice is an ideal option for keeping the bananas fresh. Toss the bananas in the fruit salad so that they become coated with the pineapple juice. Since everything is incorporated into one salad, the flavors will mingle. You can also add bananas treated with pineapple juice to other recipes if desired.
  
  

Which is Better?

• While the Dole website recommends pineapple juice as a way to keep bananas looking ripe after you cut them for use in a fruit salad, lemon juice is a good alternative, especially for bananas that you peel and freeze. The key is to toss the bananas in a light coating of lemon juice so that it doesn't overwhelm the natural flavor of the banana.
  
  

Alternatives

• Lime and orange juices are suitable alternatives to lemon or pineapple juice. The acids in the juice are what will prevent the oxidation. Whatever method you choose, lemon, pineapple or even lime, make sure that you toss the cut banana in the juice only long enough to coat it. Don't leave the banana to soak in the juice or it could compromise the flavor of the fruit.