Tuning chitosan properties to enhance blood coagulation

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Hemostasis Research

Background:

• Uncontrolled hemorrhage is a critical issue in surgery and trauma care.
• Developing effective hemostatic materials is a significant research priority.
• Chitosan is a promising biopolymer for hemostatic applications, but its properties can be further enhanced.

Purpose of the Study:

• To synthesize and characterize novel chitosan derivatives with improved hemostatic properties.
• To evaluate the hemostatic potential and toxicity of these new compounds.
• To explore their utility in modifying biomaterial surfaces for enhanced hemostasis.

Main Methods:

• Synthesis of chitosan derivatives with varied substituents (e.g., N-(3,4-dihydroxybenzyl), N-(4-(tetradecyloxy)benzyl), N-(4-carboxybenzyl), aminocaproic acid).
• Characterization using spectroscopic techniques (¹H NMR, FTIR).
• In vitro and in vivo evaluation of hemostatic efficacy using human blood and a mouse tail bleeding model.
• Cytotoxicity assessment on cell lines (3T3, HepG2, Huh7).

Main Results:

• Chitosan derivatives exhibited 3-5 times higher blood aggregation compared to native chitosan in various conditions (neutral, acidic, with Ca²⁺, citrated blood).
• The novel compounds demonstrated low toxicity to tested cell lines.
• At low concentrations, derivatives did not induce plasma coagulation or platelet aggregation, suggesting targeted hemostatic action.

Conclusions:

• Novel chitosan derivatives possess significantly enhanced hemostatic capabilities.
• These compounds show a favorable safety profile, indicating potential for biomedical use.
• The modified chitosan structures are suitable for surface functionalization of biomaterials to improve bleeding control.