Post #703819 by TikiTacky on Sun, Jan 5, 2014 10:00 AM

On 2014-01-05 09:39, nomeus wrote:
it keeps in the fridge just fine... ive barely used the reynolds that i have and its still ok

http://bgreynolds.com/products/passion-fruit

This prompted me to do a little investigation. It turns out sugar, like salt, creates an osmotic barrier, meaning it draws moisture out of bacteria. If the sugar content is high enough, bacteria can't live within it. Some molds can grow on top of it, but that's it. It's possible that the sugar content in the BG Reynolds passion fruit syrup is high enough that this is true. I put a bottle of it in my freezer and noted that it became thick but didn't freeze, likely because of the high sugar content. So it may be that the refrigerator is enough of a secondary preservative to keep it fresh for a long period of time, although not indefinitely.

Thanks for the tip, nomeus.