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Riboflavin secretion, as measured with HPLC, (A) is significantly increased (p<0.05) upon exposure to varying concentrations of as-syn TiO2 nanoparticles for 24 h. (B) A comparison of riboflavin secretion upon exposure to 25 µg/mL as-syn, P25, and T-Eco (*p<0.05 as compared to the control).
