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Figure 5. Photographs that demonstrate the self-healing behavior of the protein hydrogel at room temperature. (a) 10% BSA hydrogel with 12.5 mM Ca2+ at original, cut, self-healed, and bend states. (b) Selfhealing of 10% BSA hydrogels with different Ca2+ concentrations (15, 20, and 30 mM).
Figure 2. (a) CD spectrum of BSA solutions with and without heating. (b) FTIR spectrum of BSA solutions with and without heating.
Figure 3. BSA size distributions. (a) BSA solution. (b) BSA solution heated at 80 °C for 30 min. (c) 10% BSA mixture of heated and fresh-prepared BSA solution.
Figure 6. Photographs of the self-healing process of the protein hydrogel at room temperature. (a–d) are calcium-induced BSA hydrogel self-healed in PBS buffer with physiological levels of Ca2+. Images are taken at different time intervals: (a) original, (b) immediate after damage, (c) after 1 hr, and (d) after 7 hrs of self-healing; (e–h) are calcium-induced BSA hydrogel self-healed in PBS buffer without Ca2+. Images are taken at different time intervals: (e) original, (f) immediate after damage, (g) after 7 hrs, and (h) after 24 hrs of self-healing.
Figure 4. Changes of storage modulus G′ (a) and loss modulus G″ (b) at 1 Hz versus time for protein hydrogel forming under a constant total BSA concentration (10 wt%) and different Ca2+ concentrations at 25 °C. (c) G′ versus Ca2+ concentration at time = 1200 min. (d) G′ and G″ versus oscillation frequency at various BSA concentrations.
Results
Figure 1. The self-healing protein hydrogel system. (a) The proposed gelation process. (b) The schematic of Self-healing process in the as-prepared protein hydrogel.
Published: 22 August 2016 2016-10-21
INTRODUCTION
1. 相较于共价键交联的自修复凝胶，物理作用交联的水凝胶 不需要外界的额外刺激就可以自修复。 2. 相对于合成材料而言，本文中制备的材料毒性小，而且制 备简单。 3. 钙离子作为交联剂更适合于人体。 4. 本文制备的材料是通Hale Waihona Puke Baidu加热牛血清蛋白使得构想改变，引 发纳米聚集，再利用钙离子进行交联得到蛋白质水凝胶。 并且到目前为止还没有人制备这种在室温条件且在生理条 件下交联的蛋白质水凝胶。
CONCLUSION
制备了一种利用钙离子交联的蛋白质水凝 胶，制备简单快捷。 对形成机理做了简要的分析推理。
材料制备材料简单，测试试验较为常 见，但是解释细致深入。