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Biomimetic hydroxyapate/polydopamine composites with good biocompatibility and efficiency for uncontrolled bleeding
Mengxiang Gong1, Chenyu Liu1, Chunyu Liu1
1State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian, P.R. China.
Summary
New polydopamine composite materials effectively stop severe bleeding, outperforming commercial hemostats. These advanced materials promote rapid blood clotting and exhibit excellent biocompatibility for emergency hemostasis.
Area of Science:
- Biomaterials Science
- Nanotechnology
- Hemostasis Research
Background:
- Uncontrolled bleeding is a leading cause of death in trauma situations.
- Current commercial hemostats are insufficient for severe bleeding scenarios.
Purpose of the Study:
- To develop novel polydopamine (PDA) composite materials (PMs) for effective hemostasis.
- To investigate the hemostatic mechanism and biocompatibility of the developed PMs.
Main Methods:
- Fabrication of PDA composite materials using hydroxyapatite and lyophilization.
- Functionalization with amino and phenol hydroxyl groups to enhance hydrophobicity.
- In vitro hemostasis tests, including blood cell aggregation and clotting time assays.
- Coagulation index tests (PT, APTT), intracellular Ca2+ activation analysis, and biocompatibility assessments (hemolysis, cytotoxicity).
Main Results:
- PMs demonstrated significantly enhanced blood cell aggregation (up to 300% increase).
- Clotting time was reduced to 79.7% compared to the commercial hemostat Celox.
- Mechanism elucidated through coagulation tests and Ca2+ activation, explaining rapid coagulation and low blood loss.
- PMs exhibited low hemolysis and cytotoxicity, with erythrocytes maintaining regular morphology, indicating good biocompatibility.
Conclusions:
- The developed PDA composite materials show promising hemostatic capabilities for severe bleeding.
- The materials offer a potential advancement in trauma and emergency care.
- Further research into nanoscale composites for hemostasis is warranted.
