Engineered photoelectrochemical platform for rational global antioxidant capacity evaluation based on ultrasensitive sulfonated graphene-TiO2 nanohybrid.
Engineered photoelectrochemical platform for rational global antioxidant capacity evaluation based on ultrasensitive sulfonated graphene-TiO2 nanohybrid.
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基于超灵敏磺化石墨烯-TiO2纳米杂化物的工程光电化学平台，用于合理的整体抗氧化能力评估。
DOI：
10.1021/ac502181n
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发表时间：
2014-09
期刊：
影响因子：
--
通讯作者：
Niu, Li
中科院分区：
文献类型：
--
作者：
Gan, Shiyu;Han, Dongxue;Zhang, Qixian;Niu, Li
膳食抗氧化剂作为人体的健康促进剂，已经引起了人们的广泛关注，并引发了人们对其抗氧化能力的研究。不幸的是，到目前为止还没有设计出通用的检测系统。由于在不同的体系中抗氧化剂组分之间可能存在协同作用，通过层析方法分离和定量单个抗氧化剂限制了全球抗氧化剂活性测定的范围。使用光谱策略对任何有色食品进行质量检查都远远不能令人满意。本文介绍了一种基于超灵敏二氧化钛修饰的磺化石墨烯(SGE-TiO2)的光电化学(PEC)平台用于抗氧化剂监测。该PEC传感器在开路电位(零电位)下具有非凡的响应性、良好的重现性和稳定性，可成功应用于全球抗氧化能力的合理分析。这种高效的检测策略具有简单、方便、灵敏度高、通用性强等优点，同样适用于有色体系的检测。此外，PEC传感器还可用于茶叶抗氧化能力的实际评价。进一步提出了相关机制，并对其进行了充分讨论。这一简单而强大的方法为食品工业中的饮食抗氧化剂评估提供了一个通用的格式。
Dietary antioxidants as health promoters for human beings have attracted much attention and triggered tremendous efforts in evaluation of the antioxidant capacity. Unfortunately, no versatile detection system has been designed to date. Due to the possible synergistic effect among antioxidant components in a diversified system, to isolate and quantify an individual antioxidant via a chromatography approach limits the scope for global antioxidant activity assay. Quality inspections with a spectroscopy strategy to any colored food are far from satisfactory. Herein, a photoelectrochemical (PEC) platform with an ultrasensitive titanium dioxide decorated sulfonated graphene (SGE-TiO2) based transducer was introduced for antioxidant monitoring. Under an open circuit potential (zero potential), with extraordinary response, excellent reproducibility and stability, this PEC sensor could be successfully applied for rational analysis of the global antioxidant capacity. Such a highly efficient strategy showed advantages such as simplicity, convenience, high sensitivity and universality, which were also applicable to the detection of colored system. Moreover, the PEC sensor could be employed for practical evaluation of antioxidant capacity of teas. The concerned mechanism was further proposed and adequately discussed. This straightforward yet powerful approach provides a general format for dietary antioxidant assessment in foodstuff industries.
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