Comparative studies on molecular chain parameters of chitosans and poly(diallyldimethylammonium chloride): the stiffness B-parameter and the temperature coefficient of intrinsic viscosity

Effect of Polyelectrolyte Structure on Protein−Polyelectrolyte Coacervates: Coacervates of Bovine Serum Albumin with Poly(diallyldimethylammonium chloride) versus Chitosan

“…The effect of temperature can be attributed primarily to a decrease in τ (from 150 ms at 12°C to 22 ms at 25°C). While it has been proposed that the breaking of hydrogen bonds with temperature can account for the 6% increase in viscosity at the same temperature window for dilute chitosan, 21 this effect is Figure 7. Shear rate viscosity of the PDADMAC-BSA and chitosan-BSA coacervates at T ) 12 and 25°C.…”

“…[17][18][19] In conjunction with poly(diallydimethylammoniumchloride)(PDADMAC),chitosanaffordsahomologous pair with similar cationic charge spacing (6 Å) but very different flexibilities (2.5 nm for PDADMAC 20 ). For this reason, Smidsrød and co-workers 21 carried out stiffness parameter calculations for chitosan versus PDADMAC, confirming the 2-fold higher flexibility of PDADMAC over chitosan. It should be pointed out however that L°p corresponds to the tendency of the chain to propagate in a given direction over dimensions on the order of R g and has limited significance for the behavior at length scales less than L°p, i.e., the radius of small colloids.…”

Solution properties of poly(diallyldimethylammonium chloride) (PDDA)

“…Dilute solution properties of PDDA have been studied by several methods [10,[12][13][14][15][16][17]. Fractionated samples have been analyzed and branching has been reported for commercial samples of PDDA [10,15].…”

Polycation-Mediated Gene Delivery: The Physicochemical Aspects Governing the Process

“…With the pendent allylic double bonds being less reactive than those of the monomer, strictly linear macromolecules are formed at low conversions, but branching can proceed at high conversions as was demonstrated for commercial samples (Wandrey et al, 1999). Because of its physical structure pDADMAC is a highly flexible polymer compared to other polycations such as chitosan (Marcelo et al, 2005;Trzcinski et al, 2002). pDADMAC has been widely used in technical applications as a flocculant agent and as a composite for biosensors, which is because of its pH-independent cationic charge (Dautzenberg et al, 1998;Jaeger et al, 1996).…”