Physicochemical behavior of homogeneous series of acetylated chitosans in aqueous solution: role of various structural parameters.

摘要: Physicochemical properties of four different homogeneous series chitosans with degrees acetylation (DA) and weight-average polymerization (DPw) ranging from 0 to 70% 650 2600, respectively, were characterized in an ammonium acetate buffer (pH 4.5). Then, the intrinsic viscosity ([η]0), root-mean-square z-average gyration radius (RG,z), second virial coefficient (A2) studied by viscometry static light scattering. The conformation chitosan, according DA DPw, was highlighted through variations α ν parameters, deduced scale laws [η]0 = Kw RG,z K‘ , total persistence length (Lp,tot). In relation behaviors chitosan solution, varied two distinct domains versus a transition range between. (i) for < 25%, exhibited flexible conformation; (ii) domain 25 50%, where became sli...