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Fluorescence spectra of HSA in the presence of SSD and PF. Both conventional (A, D) and synchronous fluorescence measurements (B, C) were performed at 30 °C. CHSA = 1 μM; in the ternary binding studies: CPF = 3 μM; CSSD = 3 μM; HSA, human serum albumin; PF, paeoniflorin; SSD, saikosaponin D; Δλ = 15 nm or Δλ = 60 nm for tyrosine and tryptophan residues, respectively.
