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Absorbance spectra of glucose (A), lactate (B), and pyruvate (C) at varying concentrations, measured using QCL-IR transmission spectroscopy with a path-length of 76 μm and an average of 80 measurements. The insets represent the standard curves, including all three repeats, at 1036 cm–1 for glucose, 1124 cm–1 for lactate, and 1176 cm–1 for pyruvate. The spectra of pure perfusion fluid (0 mM) indicate the noise level.
