Establishment of Fluorescence Sensitization Method for Hydroxysafflor Yellow A

Figure 1

(a) Absorption spectra and (b) fluorescence spectra of HSYA under different acidity conditions (pH 4.0–12.0). All spectra were measured in PBS (PO₄³⁻ = 10 mM) solution at room temperature, with excitation at 450 nm. (c) Changes in maximum fluorescence intensity of HSYA with increasing pH from 4.0 to 12.0. (d) Fluorescence images of HSYA at various pH under 365 nm ultraviolet lamp.

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