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首页> 外文期刊>Journal of Agricultural and Food Chemistry >CoFe2O4 Nanoparticles as Oxidase Mimic-Mediated Chemiluminescence of Aqueous Luminol for Sulfite in White Wines
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CoFe2O4 Nanoparticles as Oxidase Mimic-Mediated Chemiluminescence of Aqueous Luminol for Sulfite in White Wines

机译：CoFe2O4纳米颗粒作为鲁米诺水溶液对白葡萄酒中亚硫酸盐的氧化酶模拟介导的化学发光。

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Recently, the intrinsic enzyme-like activity of nanoparticles (NPs) has become a growing area of interest. However, the analytical applications of the NP-based enzyme mimetic are mainly concentrated on their peroxidase-like activity; no attempts have been made to investigate the analytical applications based on the oxidase mimic activities of NPs. For the first time, we report that CoFe2O4 NPs were found to possess intrinsic oxidase-like activity and could catalyze luminol oxidation by dissolved oxygen to produce intensified chemiluminescence (CL). The effect of sulfite on CoFe2O4 NP oxidase mimic-mediated CL of aqueous luminol was investigated. It is very interesting that when adding sulfite to the luminol-CoFe2O4 system, the role of sulfite in the luminol—CoFe2O4 NP—sulfite system depends on its concentration. At a relatively low concentration level, sulfite presents an inhibition effect on the luminol—CoFe2O4 NP system. However, it does have an enhancement effect at a higher concentration level. Investigations on the effect of the solution pH and luminol and CoFe2O4 NP concentrations on the kinetic characteristics of the studied CL system in the presence of trace sulfite suggested that the enhancement and inhibition of the luminol~-CoFe2O4 NP—sulfite CL system also depended on the solution pH. It seems that the concentrations of luminol and CoFe2O4 NPs did not influence the CL pathway. The possible mechanism of the luminol—CoFe2O4 NP—sulfite CL system was also discussed. On this basis, a flow injection chemiluminescence method was established for the determination of trace sulfite in this study. Under the optimal conditions, the proposed system could respond down to 2.0 × 10~(-8) M sulfite. The method has been applied to the determination of trace sulfite in white wine samples with satisfactory results. The results given by the proposed method are in good agreement with those given by the standard titration method.
机译：最近，纳米颗粒（NPs）的内在酶样活性已成为人们关注的一个增长领域。然而，基于NP的酶模拟物的分析应用主要集中在它们的过氧化物酶样活性上。尚未尝试基于NP的氧化酶模拟活性来研究分析应用。我们首次报道，发现CoFe2O4 NP具有内在的氧化酶样活性，并且可以通过溶解氧催化鲁米诺氧化，从而产生增强的化学发光（CL）。研究了亚硫酸盐对鲁米诺水溶液中CoFe2O4 NP氧化酶模拟介导的CL的影响。有趣的是，当将亚硫酸盐添加到鲁米诺-CoFe2O4系统中时，亚硫酸盐在鲁米诺-CoFe2O4 NP-亚硫酸盐系统中的作用取决于其浓度。在相对较低的浓度下，亚硫酸盐对鲁米诺-CoFe2O4 NP系统具有抑制作用。但是，它在较高浓度下确实具有增强作用。研究溶液pH和鲁米诺和CoFe2O4 NP浓度对存在痕量亚硫酸盐时所研究CL体系动力学特性的影响，表明鲁米诺〜-CoFe2O4 NP-亚硫酸盐CL体系的增强和抑制也取决于溶液pH。鲁米诺和CoFe2O4 NP的浓度似乎不影响CL通路。还讨论了鲁米诺-CoFe2O4 NP-亚硫酸盐CL体系的可能机理。在此基础上，建立了流动注射化学发光法测定痕量亚硫酸盐的方法。在最佳条件下，所提出的系统可以对2.0×10〜（-8）M亚硫酸盐作出反应。该方法用于白葡萄酒样品中痕量亚硫酸根的测定，结果令人满意。拟议方法给出的结果与标准滴定方法给出的结果非常吻合。

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