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SER spectra of 5-FU at A) 500, 100, 10, 5, 1, 0.5, 0.1, 0.01 μg/mL (top to bottom) and B) 10 ng/mL 5-FU before (top) and after (bottom) subtraction of glass capillary background spectrum (middle). Conditions: silver-doped sol-gels in capillaries, 100 mW of 785 nm, 3-min.
