Bioreduction of platinum salts into nanoparticles: a mechanistic perspective

被引：52

作者：

Govender, Yageshni ^{[1
]}

Riddin, Tamsyn ^{[1
]}

Gericke, Mariekie ^{[2
]}

Whiteley, Chris G. ^{[1
]}

机构：

[1] Rhodes Univ, Dept Biochem Microbiol & Biotechnol, ZA-6140 Grahamstown, South Africa

[2] MINTEK, ZA-2125 Randburg, South Africa

来源：

BIOTECHNOLOGY LETTERS | 2009年 / 31卷 / 01期

关键词：

Fusarium; Hydrogenase; Mechanism; Nanoparticles; Platinum; Synthesis; SULFATE-REDUCING BACTERIA; EXTRACELLULAR SYNTHESIS; GOLD NANOPARTICLES; FUSARIUM-OXYSPORUM; FUNGUS;

D O I：

10.1007/s10529-008-9825-z

中图分类号：

Q81 [生物工程学（生物技术）]; Q93 [微生物学];

学科分类号：

071005 ; 0836 ; 090102 ; 100705 ;

摘要：

A mechanism for the bioreduction of H2PtCl6 and PtCl2 into platinum nanoparticles by a hydrogenase enzyme from Fusarium oxysporum is proposed. Octahedral H2PtCl6 is too large to fit into the active region of the enzyme and, under conditions optimum for nanoparticle formation (pH 9, 65 degrees C), undergoes a two-electron reduction to PtCl2 on the molecular surface of the enzyme. This smaller molecule is transported through hydrophobic channels within the enzyme to the active region where, under conditions optimal for hydrogenase activity (pH 7.5, 38 degrees C) it undergoes a second two-electron reduction to Pt(0). H2PtCl6 was unreactive at pH 7.5, 38 degrees C; PtCl2 was unreactive at pH 9, 65 degrees C.

引用

页码：95 / 100

页数：6

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