Dipeptide-assisted growth of uniform gallium oxohydroxide spindles

Inho Lee; rnJinyoung Kwak; rnSeungjoo Haam; rnSang-Yup Lee

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Dipeptide-assisted growth of uniform gallium oxohydroxide spindles

机译：二肽辅助生长均匀的羟基氧化镓锭

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The catalytic dipeptide His-Ser was used as an additive in mineralizing gallium ions to form GaOOH, a solid precursor of Ga_2O_3. This dipeptide was chosen to mimic the enzyme structure of silicatein, similar to the well-known catalytic triad of chymotrypsin. The dipeptide promoted formation of spindle-structured GaOOH under acidic conditions by behaving as a heterogeneous nucleation seed. In contrast, no well-defined, structured gallium species were produced in the absence of dipeptide. The catalytic function of the dipeptide was most pronounced at pH values in the range 3-5, which are lower than the pKa of imidazole in the His side chain. These results suggest that the catalytic role of dipeptide influences the gallium hydroxide conversion and growth. This study suggests that a designed peptide with active functionality can be further exploited to produce inorganic compounds with controlled nucleation and growth.

机译：催化二肽His-Ser用作矿化镓离子的添加剂，形成GaOOH（Ga_2O_3的固体前体）。选择该二肽来模拟硅铝蛋白的酶结构，类似于胰凝乳蛋白酶的众所周知的催化三联体。该二肽通过表现为异质成核种子，在酸性条件下促进了纺锤结构的GaOOH的形成。相反，在没有二肽的情况下，没有产生明确的结构化镓物质。在pH值在3-5的范围内，二肽的催化功能最为明显，该值低于His侧链中咪唑的pKa。这些结果表明二肽的催化作用影响氢氧化镓的转化和生长。这项研究表明，具有活性功能的设计肽可以进一步用于生产具有受控成核和生长的无机化合物。

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来源
《Journal of Crystal Growth》 |2010年第14期|P.2107-2112|共6页
作者
Inho Lee; rnJinyoung Kwak; rnSeungjoo Haam; rnSang-Yup Lee;
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作者单位

Department of Chemical and Biomolecular Engineering, Specialized Graduate School of Hydrogen and Fuel Cell, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul 120-749, Republic of Korea;

rnDepartment of Chemical and Biomolecular Engineering, Specialized Graduate School of Hydrogen and Fuel Cell, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul 120-749, Republic of Korea;

rnDepartment of Chemical and Biomolecular Engineering, Specialized Graduate School of Hydrogen and Fuel Cell, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul 120-749, Republic of Korea;

rnDepartment of Chemical and Biomolecular Engineering, Specialized Graduate School of Hydrogen and Fuel Cell, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul 120-749, Republic of Korea;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种 eng
中图分类
关键词
A1. Spindle; A1. Hydrolysis; A1. Nucleophilicity; A2. Dipeptide; B1. GaOOH;

机译：A1。主轴A1。水解;A1。亲核性A2。二肽B1。高呼;

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Dipeptide-assisted growth of uniform gallium oxohydroxide spindles

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