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A peroxidase-based biosensor supported by nanoporous magnetic silica microparticles for acetaminophen biotransformation and inhibition studies

机译:纳米多孔磁性二氧化硅微粒支持的基于过氧化物酶的生物传感器用于对乙酰氨基酚的生物转化和抑制研究

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摘要

Magnetized nanoporous silica based microparticles (MMPs) were used for horseradish peroxidase (HRP) immobilization and applied for amperometric peroxidase-based biosensor development. A magnetized carbon paste electrode permitted the MMPs attraction. The biosensor was applied to the investigation of the enzymatic oxidation of acetaminophen (paracetamol). The biosensor operated at low applied potential and the signal corresponded to the electroreduction of N-acetylbenzoquinoneimine (NAPQI) generated by the enzyme HRP in the presence of hydrogen peroxide. The biosensor allowed performing the quantitation of acetaminophen in the micromolar concentration range and the comparative study of thiols which inhibited the biosensor response. Distinct inhibition results were observed for HRP entrapped in the silica microparticles compared to the soluble HRP.
机译:磁化的纳米多孔二氧化硅基微粒(MMP)用于辣根过氧化物酶(HRP)的固定化,并用于基于安培过氧化物酶的生物传感器的开发。磁化的碳糊电极允许MMP吸引。该生物传感器被应用于对乙酰氨基酚(扑热息痛)的酶促氧化研究。该生物传感器在低施加电势下运行,该信号对应于过氧化氢存在下由HRP酶产生的N-乙酰基苯并醌亚胺(NAPQI)的电还原。该生物传感器允许在微摩尔浓度范围内对乙酰氨基酚进行定量,并进行了抑制生物传感器响应的硫醇的比较研究。与可溶性HRP相比,观察到截留在二氧化硅微粒中的HRP具有明显的抑制结果。

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