Coordination of Covalent Cross-Linked Gelatin Hydrogels via Oxidized Tannic Acid and Ferric Ions with Strong Mechanical Properties,Journal of Agricultural and Food Chemistry

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Coordination of Covalent Cross-Linked Gelatin Hydrogels via Oxidized Tannic Acid and Ferric Ions with Strong Mechanical Properties
Journal of Agricultural and Food Chemistry ( IF 5.7 ) Pub Date : 2019-10-08 , DOI: 10.1021/acs.jafc.9b03947
Shengju Ge _{1,

2} , Na Ji ₁ , Shaoning Cui ₂ , Wei Xie ₂ , Man Li ₁ , Yang Li ₁ , Liu Xiong ₁ , Qingjie Sun ₁

Affiliation

The design of gelatin-based hydrogels with high mechanical strength, high gelation temperature, and a rapid self-healing property still presents a challenge to researchers. In the present study, single cross-linked gelatin–oxidized tannic acid (SC-GT/OTA) hydrogels were fabricated through covalent cross-linking between gelatin and tannic acid (TA) oxidized by using sodium periodate (NaIO₄). Double cross-linked gelatin–OTA–FeCl₃·6H₂O (DC-GT/OTA/Fe^III) hydrogels were also created using metal coordination bonds formed between the catechol groups present in OTA and Fe^III in ferric chloride. As a result, the maximum gelling temperature of the SC-GT/OTA hydrogel (37 °C) was considerably higher than that of the pure gelatin hydrogel (15.4 °C). Moreover, the maximum values of compressive stress of SC-GT/OTA hydrogels increased significantly by almost seven times the original value as the molar ratio of NaIO₄ to TA increased from 3:1 to 5:1. When the molar ratio of NaIO₄ to TA was maintained at the constant of 4:1, the storage modulus values of DC-GT/OTA/Fe^III hydrogels with the Fe^III-to-TA molar ratio of 1.5:1 were three to 4 orders of magnitude higher than those of SC-GT/OTA hydrogels in the whole angular frequency range. The double cross-linked gelatin hydrogels developed in this research can be used widely in agriculture and material science fields.

中文翻译：

具有强机械性能的氧化单宁酸和铁离子对共价交联明胶水凝胶的配位作用

具有高机械强度，高胶凝温度和快速自愈特性的基于明胶的水凝胶的设计仍然对研究人员提出了挑战。在本研究中，通过使用高碘酸钠（NaIO ₄）氧化的明胶与单宁酸（TA）之间的共价交联，制备了单交联的明胶氧化单宁酸（SC-GT / OTA）水凝胶。还使用了OTA和Fe ^III中邻苯二酚基团之间形成的金属配位键，创建了双交联明胶–OTA–FeCl ₃ ·6H ₂ O（DC-GT / OTA / Fe ^III）水凝胶。在氯化铁中。结果，SC-GT / OTA水凝胶的最高胶凝温度（37°C）比纯明胶水凝胶的最高胶凝温度（15.4°C）高得多。此外，随着NaIO ₄与TA的摩尔比从3：1增加至5：1 ，SC-GT / OTA水凝胶的压应力最大值显着增加了原始值的近七倍。当NaIO ₄与TA的摩尔比保持恒定为4：1时，带有Fe ^III的DC-GT / OTA / Fe ^III水凝胶的储能模量值在整个角频率范围内，与TA-TA的摩尔比为1.5：1，比SC-GT / OTA水凝胶的摩尔比高3至4个数量级。本研究开发的双交联明胶水凝胶可广泛用于农业和材料科学领域。

更新日期：2019-10-08

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