磁性纳米颗粒-酶的生物修复偶联物

Y. Qiang, A. Sharma, A. Paszczynski, D. Meyer
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引用次数: 8

摘要

酶是在生物修复中起生物催化剂作用的蛋白质。酶在环境应用中的一个主要问题是它们的寿命短。酶由于氧化而失去活性,从而导致稳定性降低和寿命缩短,从而使它们效率降低。增加酶的稳定性、寿命和可重复使用性的有效方法是将它们附着在磁性铁纳米颗粒上。如果酶附着在磁性铁纳米颗粒上,那么我们就可以通过施加磁场很容易地将酶从反应物或产物中分离出来。为此,我们将两种不同的分解代谢酶,胰蛋白酶和过氧化物酶,附着在我们实验室生产的均匀核壳磁性纳米颗粒(MNP’s)上。我们的研究表明,酶的寿命和活性从几小时到几周急剧增加,mnp -酶偶联物更稳定、高效和经济。我们预测MNPs可以保护酶,防止它们被氧化。这导致酶的寿命增加。由于MNPs的高磁化强度(~140 emu/g),纳米颗粒-酶偶联物可以有效地磁分离,从而提高酶的生产效率。我们还发现酶的结构在MNPs的有效附着中起着重要作用
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Conjugates of Magnetic Nanoparticle-Enzyme for Bioremediation
Enzymes are proteins that function as biocatalysts in bioremediation. One of the major concerns in environmental applications of enzymes is their short lifetime. Enzymes lose their activity due to oxidation, which results in less stability and a shorter lifetime thereby rendering them less efficient. An effective way to increase the stability, longevity, and reusability of the enzymes is to attach them to magnetic iron nanoparticles. If enzymes are attached to the magnetic iron nanoparticles then we can easily separate the enzymes from reactants or products by applying a magnetic field. With this aim, two different catabolic enzymes, trypsin and peroxidase, were attached to uniform core-shell magnetic nanoparticles (MNP’s), produced in our laboratory. Our study indicates that the lifetime and activity of enzymes increases dramatically from a few hours to weeks and that MNP-Enzyme conjugates are more stable, efficient, and economical. We predict that MNPs shield the enzymes preventing them from becoming oxidized. This results in an increased lifetime of the enzymes. Because of the high magnetization (~140 emu/g) of our MNPs, nanoparticle-enzyme conjugates can efficiently be magnetically separated, making enzymes more productive. We also found that the enzyme structure plays a major role in efficient attachment of MNPs
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