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作为潜在药物释放系统的bola两亲性双脱氢肽水凝胶

Bolaamphiphilic Bis-Dehydropeptide Hydrogels as Potential Drug Release Systems.

作者信息

Amorim Carolina, Veloso Sérgio R S, Castanheira Elisabete M S, Hilliou Loic, Pereira Renato B, Pereira David M, Martins José A, Jervis Peter J, Ferreira Paula M T

机构信息

Center of Chemistry, University of Minho, 4710-057 Braga, Portugal.

Center of Physics, University of Minho, 4710-057 Braga, Portugal.

出版信息

Gels. 2021 Apr 29;7(2):52. doi: 10.3390/gels7020052.

Abstract

The self-assembly of nanometric structures from molecular building blocks is an effective way to make new functional materials for biological and technological applications. In this work, four symmetrical bolaamphiphiles based on dehydrodipeptides (phenylalanyldehydrophenylalanine and tyrosyldehydrophenylalanine) linked through phenyl or naphthyl linkers (terephthalic acid and 2,6-naphthalenedicarboxylic acid) were prepared, and their self-assembly properties were studied. The results showed that all compounds, with the exception of the bolaamphiphile of tyrosyldehydrophenylalanine and 2,6-naphthalene dicarboxylic acid, gave self-standing hydrogels with critical gelation concentrations of 0.3 wt % and 0.4 wt %, using a pH trigger. The self-assembly of these hydrogelators was investigated using STEM microscopy, which revealed a network of entangled fibers. According to rheology, the dehydrodipeptide bolaamphiphilic hydrogelators are viscoelastic materials with an elastic modulus G' that falls in the range of native tissue (0.37 kPa brain-4.5 kPa cartilage). In viability and proliferation studies, it was found that these compounds were non-toxic toward the human keratinocyte cell line, HaCaT. In sustained release assays, we studied the effects of the charge present on model drug compounds on the rate of cargo release from the hydrogel networks. Methylene blue (MB), methyl orange (MO), and ciprofloxacin were chosen as cationic, anionic, and overall neutral cargo, respectively. These studies have shown that the hydrogels provide a sustained release of methyl orange and ciprofloxacin, while methylene blue is retained by the hydrogel network.

摘要

由分子构建单元自组装纳米结构是制备用于生物和技术应用的新型功能材料的有效方法。在本工作中,制备了四种基于脱氢二肽(苯丙氨酰脱氢苯丙氨酸和酪氨酰脱氢苯丙氨酸)通过苯基或萘基连接基(对苯二甲酸和2,6-萘二甲酸)连接的对称双亲性分子,并研究了它们的自组装性质。结果表明,除酪氨酰脱氢苯丙氨酸与2,6-萘二甲酸的双亲性分子外,所有化合物在pH触发下均能形成临界凝胶浓度为0.3 wt%和0.4 wt%的自立式水凝胶。使用扫描透射电子显微镜(STEM)对这些水凝胶剂的自组装进行了研究,结果显示出缠结纤维网络。根据流变学,脱氢二肽双亲性水凝胶剂是粘弹性材料,其弹性模量G'处于天然组织范围内(脑0.37 kPa - 软骨4.5 kPa)。在活力和增殖研究中,发现这些化合物对人角质形成细胞系HaCaT无毒。在缓释试验中,我们研究了模型药物化合物上的电荷对水凝胶网络中药物释放速率的影响。分别选择亚甲蓝(MB)、甲基橙(MO)和环丙沙星作为阳离子、阴离子和整体中性的载药。这些研究表明,水凝胶能实现甲基橙和环丙沙星的缓释,而亚甲蓝则被水凝胶网络保留。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6a65/8162347/c076e18ff682/gels-07-00052-g001.jpg

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