Positive charge of chitosan retards blood coagulation on chitosan films

Abstract

In this study, a series of chitosan films with different protonation degrees were prepared by deacidification with NaOH aqueous or ethanol solutions. The films were then used as a model to investigate the effects of the positive charge of chitosan on blood coagulation. The results showed that the positive charge of chitosan acted as a double-edged sword, in that it promoted erythrocyte adhesion, fibrinogen adsorption, and platelet adhesion and activation, but inhibited activation of the contact system. In contrast to prevailing views, we found that the positive charge of chitosan retarded thrombin generation and blood coagulation on these films. At least two reasons were responsible for this phenomenon. First, the positive charge inhibited the contact activation, and second, the positive charge could not significantly promote the activation of non-adherent platelets in the bulk phase during the early stage of coagulation. The present findings improve our understanding of the events leading to blood coagulation on chitosan films, which will be useful for the future development of novel chitosan-based hemostatic devices.

Thromboelastography (TEG) Cups and Pins with Different PECVD Coatings: Effect on the Coagulation Cascade in Platelet‐poor Blood Plasma

“…Regarding the aminated (positively charged) L‐PPE:N coatings, coagulation was also observed to be delayed; these cationic surfaces promote fibrinogen absorption, but inhibit the intrinsic pathway because thrombin generation is retarded . Moreover, L‐PPE:N presented the lowest degree of reproducibility and the slowest clot kinetics (highest K value, 12.4 min, see Figure ).…”

Biocompatibility of a self-assembled glycol chitosan nanogel

“…The GC nanogel was found to be non-haemolytic, and may also be considered non-thrombogenic, in agreement with He et al, who have found that the positive charge of chitosan retarded thrombin generation and blood coagulation. (He et al, 2013).…”

Chitosan-Based Composite Materials for Prospective Hemostatic Applications

“…This pathway includes the coagulation factors XII (FXII), coagulation factors XI (FXI), high-molecular-weight-kininogen (HMWK), and pre-kallikrein. Contact of blood with functional biomaterials may produce two biological processes, including platelet adhesion and contact system activation, which have a strong synergistic effect on biomaterial-induced blood coagulation (Figure 1) [21]. Studies showed that CS induced blood coagulation in vitro was independent of coagulation factors VII (FVII) but required FXI and FXII [22].…”

“…Yunnan Baiyao , a well-known herb prescription used in oriental countries for more than 100 years, is an effective surgical sealant and hemostat. However, it is not suitable for direct intraluminal application due to the lack of an ideal substrate [21,65,66]. Lu et al [29] prepared chitosan/sodium alginate- Yunnan Baiyao composite hemostatic films by blending Yunnan Baiyao with CS and sodium alginate.…”