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Fluorescence quenching effects of ochratoxins on human serum albumin (HSA). Emission spectra of HSA (2 μM) in the presence of increasing concentrations of ochratoxin B (OTB; (A); ex slit = 5 nm, em slit = 10 nm) and ochratoxin C (OTC; (B); ex slit = 10 nm, em slit = 10 nm) in phosphate-buffered saline (PBS, pH 7.4; λex = 295 nm). Stern–Volmer plots of OTB–HSA and OTC–HSA complexes (C) (λem = 340 nm; RLU: relative light unit).
