Mentioned in article- `Medium viscosity and 91% Deacetylation degree chitosan'. Viscosities are given as range in other internet sources.
It depends on your application bur the easiest one to work with in case of molecular weight and DD is the low molecular weight chitosan from crab with molecular weight of approximately 150,000 and DD>80% . Medium viscosity of chitosan is considered to be around 400,000 gr/mol, anyhow you can check sigma aldrich website and over there you can easily find all types of chitosan from different resources and you can choose the one applicable for you.
The viscosity of chitosan is directly related to its molecular weight. The medium molecular weight chitosan is used to ensure its easy incorporation and retention with the matrix. In contrast, it would be difficult to incorporate high molecular weight chitosan into any matrix while low molecular weight chitosan will be leaked out during the post-synthesis processing of the composite.
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