Does cornstarch affect the pH of what I'm cooking?

  • Does cornstarch affect the pH of what I'm cooking? Lisa

    I'm considering canning some fruit compotes to use with yogurt, and the recipe I want to use (which was not designed with canning in mind, found here: ) calls for cornstarch to be used to thicken everything up.

    Now, I do not have a pressure cooker, so I would be doing this with a water bath canner, and I'd like to know if the cornstarch is going to lower the acidity of the fruit mixture, or if I should use some other thickening agent or method.


  • I don't have any info on the affect of pH, but cornstarch can make your compote separate when canned:

    Two alternative thickeners are tapioca and clearjel. I've used clearjel for canning with excellent results. I haven't used tapioca to can, but do prefer it in my pies.

    (posted as an answer per Sobachatina's recommendation)

canning acidity cornstarch
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