Quantitation of Glutathione by Quinoline-5, 8-Dione-Based Tag Strategy Using MALDI Mass Spectrometry

Quantitation of Glutathione by Quinoline-5, 8-Dione-Based Tag Strategy Using MALDI Mass Spectrometry
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使用 MALDI 质谱法通过基于喹啉-5、8-二酮的标签策略对谷胱甘肽进行定量

DOI:
10.1007/s13361-019-02135-4
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发表时间:
2019-02
影响因子:
3.2
通讯作者:
Guo Xinhua
Guo Xinhua
中科院分区:
化学3区
文献类型:
--
作者:
Guo Liming;Xiao Chunsheng;Wang Sheng;Gao Tianyang;Ling Ling;Guo Xinhua

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在目前的工作中,我们开发了一种紫外线吸收性高反应性标签芳香分子喹啉-5,8-二酮(QLD),用于通过基质辅助激光解吸/电离(MALDI)质谱法对谷胱甘肽进行稳健的定量分析。 QLD可以在室温下与GSH高效反应,并且所得的QLD-GSH缀合物可以很容易地通过MALDI MS检测而不会受到干扰。通过使用 QLD 标签,GSH 的检测限降低至 10 fmol μL−1,比不使用 QLD 标签检测到的检测限高四个数量级。此外,使用谷氨酸-半胱氨酸-丙氨酸 (ECA) 作为内标,成功地证明了溶液中 GSH 的精确定量测量。通过适当调整 ECA 浓度,QLD 标记的 GSH (QLD-GSH) 与 QLD 标记的 ECA (QLD-ECA) 的强度比值在 4 至 4000 μM 的宽范围内与 GSH 浓度呈现良好的线性关系。最后,还成功检测了HeLa细胞裂解液中的GSH水平,结果与比色法得到的结果一致。总之,所提出的基于 QLD 的标签方法应该是一种快速、经济/时间有效且灵敏的 MALDI MS 定量测定 GSH 的新方法。
In the present work, we developed an UV-absorptive and highly reactive tag aromatic molecule, quinoline-5,8-dione (QLD), for robust quantitative analysis of GSH by matrix-assisted laser desorption/ionization (MALDI) mass spectrometry. The QLD could react with GSH with high efficiency at room temperature, and the resultant QLD-GSH conjugate could be readily detected by MALDI MS without interferences. By using the QLD tag, the detection limit of GSH was lowered to 10 fmol μL−1, which was four orders of magnitude higher than that detected without using the QLD tag. Furthermore, accurate quantitative measurements of GSH in solution were successfully demonstrated by using glutamic acid-cysteine-alanine (ECA) as an internal standard. By properly adjusting the ECA concentrations, the intensity ratio value of QLD-tagged GSH (QLD-GSH) to QLD-tagged ECA (QLD-ECA) displayed a good linearity with GSH concentrations in a broad range from 4 to 4000 μM. Finally, the GSH level in HeLa cell lysates was also successfully detected, and the results are consistent with that obtained by a colorimetric assay. In summary, the proposed QLD-based tag method should be a rapid, cost-/time-effective, and sensitive new method for quantitative determination of GSH by MALDI MS.
一种高灵敏度和耐污染基质,可通过基质辅助激光解吸/电离质谱法轻松检测膜蛋白
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