期刊
ANALYTICAL CHEMISTRY
卷 88, 期 19, 页码 9518-9523出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.6b02081
关键词
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资金
- NSFC [21305104, 21505045]
- NSFC for Distinguished Young Scholars [21325521]
- Program of the Shanghai Subject Chief Scientist [15XD1501600]
- Pujiang Program [15PJ1401800]
Hypochlorite (ClO-) and glutathione (GSH) have been reported to closely correlate with oxidative stress and related diseases; however, a clear mechanism is still unknown, mainly owing to a lack of accurate analytical methods for live cells. Herein we create a novel surface-enhanced Raman scattering, (SERS) nanoprobe, 4-mercaptophenol (4-MP)-functionalized gold flowers (AuF/MP), for imaging and biosensing of ClO- and GSH in RAW 264.7 macrophage cells upon oxidative stress. The SERS spectra of AuF/MP change with the reaction between ClO- and 4-MP on AuFs within 1 min and then recover after reaction with GSH, resulting in the ratiometric detection of ClO- and GSH with high accuracy. The single SERS probe also shows high selectivity for ClO- and GSH detection against other reactive oxygen species and amino acids which may exist in biological systems, as well as remarkable sensitivity ascribed to a larger amount of hot spots on AuFs. The significant analytical performance of the developed nanoprobe, together with good biocompatibility and high cell-permeability, enables the present SERS probe imaging and real-time detection of ClO- and GSH in live cells upon oxidative stress.
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