I've been buying unpasteurized orange juice recently for its richer flavor, as compared to pasteurized OJ. I've had some sitting in the fridge for about a week, and upon tasting it just now I noticed an extra tang that I'm pretty sure was not there when I first bought it. I presume this is due to some new acid in the juice that has formed from the breakdown of other components of the juice as it aged. I quite like this additional complexity of the flavor, but I am curious: What is it? In particular, what acid might I be tasting?
Old, unpasteurized orange juice has extra tang
acidityjuiceoranges
Best Answer
It is almost certainly a fermentation - opened juice does not keep for a week in the fridge. So you got some bacteria in it which are creating tangy byproducts (lactic or acetic acid). It is a method of creating fermented drinks such as cider (or even fruit wine), but without following a tested process, you cannot be sure if some of the bacteria may be harmful. So it is not safe by today's standards.