A New Quantification Method Using Electrochemical Mass Spectrometry

A New Quantification Method Using Electrochemical Mass Spectrometry
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使用电化学质谱法的新定量方法

DOI:
10.1007/s13361-018-2116-6
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发表时间:
2019
影响因子:
3.2
通讯作者:
Chen, Hao
Chen, Hao
中科院分区:
化学3区
文献类型:
--
作者:
Xu, Chang;Zheng, Qiuling;Zhao, Pengyi;Paterson, Joseph;Chen, Hao

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基于质谱的定量方法发展迅速。一般来说,准确定量的方法依赖于使用真实的目标化合物或同位素标记的化合物作为标准品,这些标准品可能不可用或难以合成。为了应对这一巨大挑战,本文提出了一种新的方法,基于电化学(EC)结合质谱(MS)。在这种方法中,允许目标化合物经历电化学氧化,然后进行MS分析。根据法拉第定律,从电化学(EC)测量记录的氧化电流提供关于氧化分析物的量的信息。另一方面,氧化反应产率可以根据电解时分析物MS信号的变化来确定。因此,可以测定分析物的总量。与液相色谱联用,可用于混合物分析。这种定量方法的显著优点是既不需要标准化合物,也不需要校准曲线。各种分析物分子,如多巴胺,去甲肾上腺素,芦丁以及肽谷胱甘肽在低量成功地定量使用我们的方法与定量误差范围从-2.6%到+4.6%。复杂基质中的分析物(例如,尿中的尿酸)也被准确地测量。
Mass spectrometry-based quantification method has advanced rapidly. In general, the methods for accurate quantification rely on the use of authentic target compounds or isotope-labeled compounds as standards, which might be not available or difficult to synthesize. To tackle this grand challenge, this paper presents a novel approach, based on electrochemistry (EC) combined with mass spectrometry (MS). In this approach, a target compound is allowed to undergo electrochemical oxidation and then subject to MS analysis. The oxidation current recorded from electrochemistry (EC) measurement provides information about the amount of the oxidized analyte, based on the Faraday’s Law. On the other hand, the oxidation reaction yield can be determined from the analyte MS signal changes upon electrolysis. Therefore, the total amount of analyte can be determined. In combination with liquid chromatography (LC), the method can be applicable to mixture analysis. The striking strength of such a method for quantitation is that neither standard compound nor calibration curve is required. Various analyte molecules such as dopamine, norepinephrine, and rutin as well as peptide glutathione in low quantity were successfully quantified using our method with the quantification error ranging from − 2.6 to + 4.6%. Analyte in a complicated matrix (e.g., uric acid in urine) was also accurately measured.
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