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Tannic Acid Radicals in the Presence of Alkali Metal Salts and Their Impact on the Formation of Silicate-Phenolic Networks
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-11-12 , DOI: 10.1021/acsami.0c16946
Florian Weber 1 , Einar Sagstuen 2 , Qi-Zhi Zhong 3 , Tian Zheng 4 , Hanna Tiainen 1
Affiliation  

Polyphenolic molecules have become attractive building blocks for bioinspired materials due to their adhesive characteristics, capacity to complex ions, redox chemistry, and biocompatibility. For the formation of tannic acid (TA) surface modifications based on silicate-phenolic networks, a high ionic strength is required. In this study, we investigated the effects of NaCl, KCl, and LiCl on the formation of TA coatings and compared it to the coating formation of pyrogallol (PG) using a quartz-crystal microbalance. We found that the substitution of NaCl with KCl inhibited the TA coating formation through the high affinity of K+ to phenolic groups resulting in complexation of TA. Assessment of the radical formation of TA by electron paramagnetic resonance spectroscopy showed that LiCl resulted in hydrolysis of TA forming gallic acid radicals. Further, we found evidence for interactions of LiCl with the Siaq crosslinker. In contrast, the coating formation of PG was only little affected by the substitution of NaCl with LiCl or KCl. Our results demonstrate the interaction potential between alkali metal salts and phenolic compounds and highlight their importance in the continuous deposition of silicate-phenolic networks. These findings can be taken as guidance for future biomedical applications of silicate-phenolic networks involving monovalent ions.

中文翻译:


碱金属盐存在下的单宁酸自由基及其对硅酸盐-酚醛网络形成的影响



多酚分子因其粘合特性、络合离子能力、氧化还原化学和生物相容性而成为仿生材料的有吸引力的构建模块。为了形成基于硅酸盐-酚网络的单宁酸(TA)表面改性,需要高离子强度。在本研究中,我们研究了 NaCl、KCl 和 LiCl 对 TA 涂层形成的影响,并使用石英晶体微天平将其与连苯三酚 (PG) 涂层的形成进行了比较。我们发现,用 KCl 替代 NaCl 通过 K +与酚基的高亲和力导致 TA 络合,抑制了 TA 涂层的形成。通过电子顺磁共振波谱对 TA 自由基形成的评估表明,LiCl 导致 TA 水解,形成没食子酸自由基。此外,我们还发现了 LiCl 与 Si水溶液交联剂相互作用的证据。相比之下,用LiCl或KCl替代NaCl对PG涂层的形成影响很小。我们的结果证明了碱金属盐和酚类化合物之间的相互作用潜力,并强调了它们在硅酸盐-酚类网络的连续沉积中的重要性。这些发现可以作为涉及单价离子的硅酸盐-酚网络未来生物医学应用的指导。
更新日期:2020-11-25
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