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When I store it in the refrigerator, my simple syrup always seems to crystallize. How can I prevent this? How long should I expect simple syrup to keep?

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So we might be looking for data on the saturation concentration of sugar at various temperatures... something I was going to post a question about, since the syrup for my lemon sherbet crystallized slightly in the refrigerator today! – Jefromi Mar 21 '11 at 5:30
I think a more important question is, why is it crystallizing at all? I've had simple syrup in my fridge for months and it didn't crystallize. Perhaps my fridge is colder or warmer than Katie's? Is this a 1-to-1 water-sugar recipe? – Neil Fein Mar 22 '11 at 2:45
@Neil - Yes, it's a one part water to one part sugar recipe. – KatieK Mar 22 '11 at 16:06
Agave syrup doesn't crystallize. – Chloe Mar 27 '12 at 17:45

3 Answers

up vote 4 down vote accepted

There are a couple of things you can do to prevent sugar crystallising. You can add some glucose syrup, or you can 'invert' the sugar by adding some acid, namely cream of tartar. Both should be readily available, online if not at your supermarket. Cream of tartar is also useful when making meringue.

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Doh! Shouldn't have followed Lebovitz's recipe so carefully - he had me add the lemon juice after chilling the syrup. – Jefromi Mar 21 '11 at 17:08

I always throw in some corn syrup when make a simple syrup. The extra glucose adds some "chaos" to the mix and keeps the crystals from forming their structure.

I also like to add some cream of tartar to help break up the sucrose in the table sugar into its component parts of fructose and glucose.

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When my honey crystallizes, I put it in an electric oven set to 50 degrees C for a couple of hours. Perhaps this trick would work with syrup as well since their composition is similar. Also, make sure that there are no crystals when you put it in the refrigerator, they act as seeds on which more crystals grow.

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