I have looked up how to make Banana juice because I wondered if it was possible. It turns out that it is.
I read that it is best to use a blender for this.
Wouldn't I just end up with a banana puree if I use a blender to try to juice it?
If you microwave bananas for a few minutes in a bowl covered with plastic wrap and then dump everything into fine mesh strainer to sit for about 15 minutes, you will get a bunch of juice out. Freezing the bananas before microwaving them works even better.
This technique was used in a (really good) banana bread recipe from Cooks Illustrated several years ago. Once the juice is extracted, it is reduced, allowing more real bananas in the bread without making it too wet.
I've made banana juice a number of times. And I'm referring to a relatively clear liquid extracted from the bananas. It's a pretty straightforward process that produces a high yield. The water in bananas is chemically bound to the starch in bananas and this liquid can be released by breaking down the starch using an enzyme called amylase that is present in bananas. Here's how I do it:
(Yield 1 liter of juice)
hmm... I imagine that a method similar to getting liquid to make jellies could work for this. Freezing would break the cell walls and allow more liquid out, then you could blend it to a lovely mush and then put it into a jelly-bag or cheese-cloth and suspend it over a bowl in the fridge for a day or two and you should get some liquid out :)
You can make banana juice by using enzymatic breakdown of the starches. It is not a difficult process, and can be accomplished in the home kitchen, but would require some ingredients and techniques that you may not have or be familiar with. The details can be found here: https://www.chefsteps.com/activities/banana-juice--11
While this produces excellent results, you could speed the process greatly and achieve a higher yield if you have access to a food safe centrifuge.
There is no such thing as banana juice. Banana flavor comes from an oil that does not mix well with water. Normally it is imbued in the fatty flesh of the banana.
You can buy banana acetate which has a banana-like flavor. I think this can be mixed with water to make juice. It does not taste exactly like banana, but is similar.