Why fresh-squeezed orange juice turns bitter.
Several times recently I have squeezed a large number of oranges, enjoyed some of the delicious fresh-squeezed juice, and then been disappointed by the rest the next day. It tastes bitter, and becomes worse rapidly. This turns out to be the result of naturally occurring limonoate A-ring lactone (aka "LARL," a tasteless substance) breaking down into limonin, which is very bitter tasting. The amount of LARL varies between oranges and throughout the growing season. If there’s any way to arrest the conversion of LARL to limonin in the home-squeezing process, I don’t know about it. →