I have a CT3 Texture analyser and currently I am working on the properties of gel. I want to find out apparent modulus of the gel and also gel strength. For that, the instrument have inbuilt software TexturePro CT V1.7 Build 28. I dont know how to get the values of apparent modulus and also during feeding the data for results what range to set for determination of apparent modulus from ____% to ____%. I tried doing a few times but it shows value as zero. Also how to determine gel strength for the same.
You cannot calculate the absolute value of the elastic modulus from the structure.
But probably a good approximation for the relative variation from one sample to another should be to write: modulus proportional to 1/L^3 where L is the mesh size of the gel.
The compression modulus is related to the slope of the force/depression curve. The force gives the stress and the depression the strain. Both need geometrical correction factors. The result depends on the geometry of the sample, the probe shape and size and, for large flat plates whether the probe/sample contact is lubricated or not. I cannot find the old papers by Oakenfull which explained all this nicely. Apparently it is in "Steffe J.F., Rheological Methods in Food Processing Engineering, Freeman Press, East Lansing, MI, USA, 1996."
Sounds to me like your problem is that your gels are too weak, but it is hard to tell.
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