Utilization of milk protein as an environmental material. Accumulation of metal ions by a protein-inorganic hybrid material
Utilization of milk protein as an environmental material. Accumulation of metal ions by a protein-inorganic hybrid material
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乳蛋白作为环保材料的利用。
DOI：
10.1038/pj.2015.113
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
Masanori Yamada and Mayuna Tsuruzumi
中科院分区：
文献类型：
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作者：
上田祐生;大渡啓介;Masanori Yamada and Mayuna Tsuruzumi
酪蛋白是众所周知的磷蛋白，其在其分子结构中具有许多金属离子结合位点;因此，含酪蛋白的杂化材料可用于从水溶液中积累金属离子。将酪蛋白与硅烷偶联剂双[3-（三甲氧基硅基）丙基]胺混合，制备了酪蛋白-无机杂化材料。由于酪蛋白中的磷酸基团与硅烷偶联剂中的氨基之间的静电相互作用，这种酪蛋白-无机杂化材料在水溶液中是稳定的。当酪蛋白-无机杂化材料在含Cu（II）离子的水溶液中孵育时，由于Cu（II）离子的积累，杂化材料变蓝。因此，我们证明了使用酪蛋白-无机杂化材料从水溶液中积累各种金属离子。该杂化材料能选择性地富集重、轻金属离子，且不与稀土金属离子发生相互作用。此外，金属离子积累的酪蛋白-无机杂化材料可以通过用EDTA水溶液或盐酸洗涤来回收。
Casein is a well-known phosphoprotein that possesses many metal ion-binding sites in its molecular structure; thus, a casein-containing hybrid material can be used for accumulating metal ions from an aqueous solution. A casein–inorganic hybrid material was prepared by mixing casein and a silane coupling reagent, bis [3-(trimethoxysilyl) propyl] amine. This casein–inorganic hybrid material was stable in an aqueous solution owing to the electrostatic interactions between the phosphate group in casein and the amino group in the silane coupling reagent. When the casein–inorganic hybrid material was incubated in an aqueous Cu (II) ion-containing solution, the hybrid material turned blue owing to the accumulation of the Cu (II) ions. Therefore, we demonstrated the accumulation of various metal ions using the casein–inorganic hybrid material from aqueous solutions. The hybrid materials could selectively accumulate heavy and light metal ions and did not interact with the rare-earth metal ions. In addition, the metal ion-accumulated casein–inorganic hybrid materials could be recycled by washing with an aqueous EDTA solution or hydrochloric acid.