I'm trying to make strawberry jam with agar-agar as replacement of pectin, where for it I'm using 0,4% of agar (of final product). I have read in many places that by replacing 0.1-0.2% of agar with locust beam gum is possible to prevent syneresis effect. My problem is that I tried but it does not work very well. After a single day water starts to show up. On the contrary, the same recipe but with pectin is syneresis free. So, is it possible to totally prevent syneresis using agar-agar?

  • You might be able to reduce the syneresis using a humectant such as glycerin or sorbitol: google.com/… I've not tried this with agar, but it helps with eg tapioca. Apr 13, 2016 at 17:52

1 Answer 1


Unfortunately, syneresis is a byproduct of an agar gel. It is the nature of the molecular structure formed in the gel. This can be desirable, especially when using agar as a clarifying agent, however, not good for your jam. According to www.molecularrecipes.com, you can prevent this by replacing 0.1 - 0.2 percent agar with locust bean gum. I see you've tried this, but it is the common wisdom/suggestion. Maybe up the lbg a little? Alternate thickeners are gelatin, arrowroot or chia seeds.

  • Ok, thanks. Do you know if the syneresis effect continues with time. If I leave it for a month, for example, will the jam be totally liquid?
    – Miguel
    Mar 14, 2016 at 10:49
  • @Miguel the solids will be left behind, the clear liquid will be flavored. It will happen in days/hours (depending), as opposed to weeks.
    – moscafj
    Mar 14, 2016 at 12:13

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