金/γ-三氧化二铁复合纳米粒子的声化学制备及谷胱甘肽的磁分离
Sonochemical preparation of composite nanoparticles of Au/gamma-Fe2O3 and magnetic separation of glutathione.
作者信息
Mizukoshi Yoshiteru, Seino Satoshi, Okitsu Kenji, Kinoshita Takuya, Otome Yohei, Nakagawa Takashi, Yamamoto Takao A
机构信息
Department of Industrial Chemistry, Osaka Prefectural College of Technology, 26-12, Saiwai-cho, Neyagawa, Osaka 572-8572, Japan.
出版信息
Ultrason Sonochem. 2005 Feb;12(3):191-5. doi: 10.1016/j.ultsonch.2003.12.003.
We prepared Au/gamma-Fe2O3 composite nanoparticles by sonochemically reducing Au(III) ions employing no stabilizer in the aqueous solution to form stable Au nanoparticles and allowing them to attach onto the surface of gamma-Fe2O3 particles with an average size of 21 nm. Size of the formed Au nanoparticle depended on the initial concentration of Au(III) ions. The number of the Au nanoparticles, supported on each gamma-Fe2O3 particle was controlled by changing the relative amounts of Au(III) ions and gamma-Fe2O3 particles. The composite nanoparticles exhibited a high affinity with glutathione, a tripeptide with mercapto group so that separation and manipulation of glutathione in aqueous solutions could be performed by application of external magnetic field. Because the surfaces of the Au nanoparticles were not shielded by any stabilizers, or naked, sonochemically prepared Au/gamma-Fe2O3 composite nanoparticles seemed to show stronger affinity to the glutathione than those by the radiochemical method.
我们通过超声化学还原金（III）离子制备了金/γ-氧化铁复合纳米颗粒，在水溶液中不使用稳定剂以形成稳定的金纳米颗粒，并使其附着在平均尺寸为21nm的γ-氧化铁颗粒表面。所形成的金纳米颗粒的尺寸取决于金（III）离子的初始浓度。通过改变金（III）离子和γ-氧化铁颗粒的相对量来控制负载在每个γ-氧化铁颗粒上的金纳米颗粒的数量。该复合纳米颗粒与谷胱甘肽（一种具有巯基的三肽）表现出高亲和力，因此可以通过施加外部磁场在水溶液中分离和处理谷胱甘肽。由于金纳米颗粒的表面没有被任何稳定剂屏蔽，即裸露的，通过超声化学方法制备的金/γ-氧化铁复合纳米颗粒似乎比通过放射化学方法制备的那些对谷胱甘肽表现出更强的亲和力。
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