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Changes in biocidal activities (a) of PVAc–Cu1 coating against S. aureus under white light irradiation at a light fluence of 48 J/cm2 (20 min) after storage of 0, 30, and 60 days at 23 °C. The absorption spectrum (b) after PVAc–Cu1 coating was stored for 0 (1) and 60 (2) days and dissolved in ethanol and the absorption spectrum of curcumin in ethanol after a 14-day interval (3). Small letters (P < 0.05) and capital letters and **(P < 0.01).
