| Autor: |
Platon IV; 'Petru Poni' Institute of Macromolecular Chemistry, Grigore Ghica Voda Alley 41A, Iasi 700487, Romania., Ghiorghita CA; 'Petru Poni' Institute of Macromolecular Chemistry, Grigore Ghica Voda Alley 41A, Iasi 700487, Romania., Lazar MM; 'Petru Poni' Institute of Macromolecular Chemistry, Grigore Ghica Voda Alley 41A, Iasi 700487, Romania., Aprotosoaie AC; Faculty of Pharmacy, 'Grigore T. Popa' University of Medicine and Pharmacy, Universitatii Street 16, Iasi 700115, Romania., Gradinaru AC; Faculty of Pharmacy, 'Grigore T. Popa' University of Medicine and Pharmacy, Universitatii Street 16, Iasi 700115, Romania., Nacu I; 'Petru Poni' Institute of Macromolecular Chemistry, Grigore Ghica Voda Alley 41A, Iasi 700487, Romania.; Faculty of Medical Bioengineering, 'Grigore T. Popa' University of Medicine and Pharmacy, Iasi 700115, Romania., Verestiuc L; Faculty of Medical Bioengineering, 'Grigore T. Popa' University of Medicine and Pharmacy, Iasi 700115, Romania., Nicolescu A; 'Petru Poni' Institute of Macromolecular Chemistry, Grigore Ghica Voda Alley 41A, Iasi 700487, Romania., Ciocarlan N; Botanical Garden, Academy of Sciences of Moldova, Padurii Street 18, Chisinau 2002, Republic of Moldova., Dinu MV; 'Petru Poni' Institute of Macromolecular Chemistry, Grigore Ghica Voda Alley 41A, Iasi 700487, Romania. |
| Abstrakt: |
Biobased porous hydrogels enriched with phytocompounds-rich herbal extracts have aroused great interest in recent years, especially in healthcare. In this study, new macroporous hybrid cryogel constructs comprising thiourea-containing chitosan (CSTU) derivative and a Hypericum perforatum L. extract (HYP E ), commonly known as St John's wort, were prepared by a facile one-pot ice-templating strategy. Benefiting from the strong interactions between the functional groups of the CSTU matrix and those of polyphenols in HYP E , the hybrid cryogels possess excellent liquid absorption capacity, mechanical resilience, antioxidant performance, and a broad spectrum of antibacterial activity simultaneously. Thus, owing to their design, the hybrid constructs exhibit an interconnected porous architecture with the ability to absorb over 33 and 136 times their dry weight, respectively, when contacted with a phosphate buffer solution (pH 7.4) and an acidic aqueous solution (pH 2). These cryogel constructs have extremely high compressive strengths ranging from 839 to 1045 kPa and withstand elevated strains of over 70% without developing fractures. Moreover, the water-swollen hybrid cryogels with the highest HYP E content revealed a complete and instant shape recovery after uniaxial compression. The incorporation of HYP E into CSTU cryogels enabled substantial improvement in scavenging reactive oxygen species and an expanded antibacterial spectrum toward multiple pathogens, including Gram-positive bacteria ( Staphylococcus aureus and Staphylococcus epidermidis ), Gram-negative bacteria ( Escherichia coli and Pseudomonas aeruginosa ), and fungi ( Candida albicans ). Cell viability experiments demonstrated the cytocompatibility of the 3D cryogel constructs, which did not induce changes in the fibroblast morphology. This work showcases a simple and effective strategy to immobilize HYP E extracts on CSTU 3D networks, allowing the development of novel multifunctional platforms with promising potential in hemostasis, wound dressing, and dermal regeneration scaffolds. |
