核黄素介导的壳聚糖-明胶冷冻凝胶的紫外交联用于负载疏水性生物活性化合物。
Riboflavin mediated UV crosslinking of chitosan-gelatin cryogels for loading of hydrophobic bioactive compounds.
机构信息
"Petru Poni" Institute of Macromolecular Chemistry, Grigore Ghica Voda Alley, 41 A, 700487, Iasi, Romania.
"Petru Poni" Institute of Macromolecular Chemistry, Grigore Ghica Voda Alley, 41 A, 700487, Iasi, Romania.
出版信息
Carbohydr Polym. 2024 Jan 15;324:121521. doi: 10.1016/j.carbpol.2023.121521. Epub 2023 Oct 23.
Chitosan-gelatin cryogels with good loading capacity of hydrophobic compounds were successfully obtained by UV-induced crosslinking. Using riboflavin as photoinitiator was a suitable alternative to classical carbodiimide crosslinking in obtaining carrier matrices for bioactive hydrophobic compounds. Chitosan had a double role, acting both as a base polymer for the hydrogel network and as co-initiator in riboflavin photo-crosslinking. This co-initiator role of chitosan is due to its electron donor capacity, being well known as a Lewis base type macromolecule. The rheological behaviour of the chitosan-gelatin hydrogel precursor solutions was greatly influenced by riboflavin addition as well as by UV irradiation. As a consequence, the temperature of the sol-gel transition during cooling decreased to 25.5 °C. Compared with classical carbodiimide crosslinking, UV irradiation lead to gels with increased network stability, enhanced elastic behaviour, higher structural strength and almost total stress recovery yield (99 %), the latter indicating self-healing capacity. The cryogels manifested pH responsive swelling, this being highest at close to neutral pH of 7.4. Although hydrophilic in nature, the chitosan-gelatin cryogels crosslinked under the combined effect of riboflavin and UV exposure possess the necessary chemical functionality and morphology that allowed successful embedding of hydrophobic clove essential oil. This was loaded by immersion or fumigation and imparted antioxidant activity to the polymeric matrix.
通过紫外光交联成功获得了具有良好疏水性化合物负载能力的壳聚糖-明胶冷冻凝胶。使用核黄素作为光引发剂是替代经典碳二亚胺交联获得生物活性疏水性化合物载体基质的合适选择。壳聚糖具有双重作用,既作为水凝胶网络的基础聚合物,又作为核黄素光交联的共引发剂。壳聚糖的这种共引发剂作用归因于其电子供体能力,它是众所周知的路易斯碱型大分子。核黄素的添加以及紫外光照射极大地影响了壳聚糖-明胶水凝胶前体溶液的流变行为。结果,溶胶-凝胶转变过程中的冷却温度降低至 25.5°C。与经典的碳二亚胺交联相比,紫外光照射导致凝胶的网络稳定性提高、弹性增强、结构强度更高,几乎达到 99%的完全应力恢复产率,表明其具有自修复能力。冷冻凝胶表现出 pH 响应性溶胀,在接近中性 pH 值 7.4 时达到最高值。尽管壳聚糖-明胶冷冻凝胶具有亲水性,但在核黄素和紫外光的共同作用下交联后,具有必要的化学官能性和形态,允许成功嵌入疏水性丁香油。可以通过浸泡或熏制将其负载,并赋予聚合物基质抗氧化活性。