- I am study the structure of starch
- I wish to get the form factor (P(q))and structure factor (S(q) of starch
- if S(q)=1, the system should be dilute enough
- So the question comes, Does 1 mg/ml starch in DMSO solution is a dilute system to study its SAXS pattern?
Thanks for your information, I am still wondering how to prepare 15% starch suspension while without precipitation
Dear Colleagues,
SAXS can be applied for both dilute solution and concentrated solution.
Dependence of SAXS intensity on wave vector q has monotonic behavior for the case of dilute solution and has a maximum for the small q for the case of the concentrated solutiion. The interpretation of SAXS data can be given for the both cases.
So, my answer is to apply SAXS and then to inteprete SAXS data depends on the experimental results.
Good luck,
Aleksandr Gokhman
I would always run measurements at different concentrations (in your case say 0.5, 1 and 2 mg/ml). If the scattering profiles are superimposable after rescaling by concentration you should be reasonable safe that you are at "infinite dilution"; if not, you are seeing some sort of interparticle interference and/or aggregation/polymerization effects.
Good luck!
Jan
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