In Situ Ionically Cross-Linkable Benzaldehyde-Modified Alginate and Its Bilayer Structure as a Tissue Sealant for...

Area of Science:

• Biomaterials Science
• Surgical Innovation
• Polymer Chemistry

Background:

• Effective tissue adhesives are critical for successful surgical outcomes.
• Existing sealants may have limitations in adhesion strength, biocompatibility, or mechanical integrity.

Purpose of the Study:

• To synthesize and characterize a novel alginate-based tissue adhesive.
• To evaluate the adhesive properties, mechanical strength, and biocompatibility of the modified alginate hydrogel.

Main Methods:

• Synthesis of p-aminobenzaldehyde-modified alginate (AL-ABA) with varying degrees of substitution.
• Ionic cross-linking of AL-ABA using calcium chloride (CaCl2).
• Development and testing of bilayer hydrogel configurations (AL-ABA/AL).

Main Results:

• AL-ABA hydrogels exhibited rapid gelation and enhanced dural adhesion with increasing degree of substitution.
• Bilayer AL-ABA/AL hydrogels achieved high adhesion (32 kPa) and burst pressure resistance (406 mmHg).
• The material demonstrated low cytotoxicity and good hemocompatibility.

Conclusions:

• Ionically cross-linked AL-ABA shows significant potential as a biocompatible and effective tissue sealant.
• The bilayer hydrogel configuration optimizes both adhesion and mechanical properties for surgical use.
• This modified alginate offers a promising solution for tissue sealing applications.