I would like to simulate the formation of polymer nano-complex using two biopolymers and find the effect of the concentration of both the substrates on the particle size of that nano-complex in a suitable molecular dynamics software. Is it possible? And what would be the best software for this type of work?

I have seen some other simulations of this kind, but on those, they have used some kind of structure. But the structure of Arabic gum (which is one of the polymers) is not available on any of the databases that I have searched. What can be a possible solution to this conundrum?