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Quantitative characterization of intracellular H2O2 content, which is still difficult by the conventional biochemical methods due to the lack of real-time and non-invasive technique of single cell measurement, is a useful solution for cell state assessment. Based on the surface enhanced Raman scattering (SERS), we construct a novel boric acid (BA) nanoprobe to perform quantitative characterization of H2O2 content, in which the p-thiol benzene boric acid (4-MPBA) reporter molecule modified with gold nanorods (AuNRs) is employed for Raman