RETRACTED: Al-Thubaiti et al. Safety of Commercially Available Beef Burger in Saudi Arabia. Coatings 2021, 11, 686

Abstract

The journal retracts the article, “Safety of Commercially Available Beef Burger in Saudi Arabia [...]

Antibacterial Photodynamic Therapy by Zn(II)‐Curcumin Complex: Synthesis, Characterization, DFT Calculation, Antibacterial Activity, and Molecular Docking

“…Thubaiti et al have reported the antibacterial activity of Zn-curcumin in concentrations ranging from 0.01 mg/mL-2.5 mg/mL without light irradiation (Table 1). [60] The MIC of complexes was thus also determined in this concentration range and it was observed that for gram-positive bacteria, 1, 2, and 3 demonstrate MIC of 2.5, 1, and 1 mg/mL. For gramnegative bacteria, complexes 2 and 3 presented a MIC of 1 and 2.5 mg/mL whereas 1 shows no activity.…”

“…Complexes 1 and 2 did not display any absorption band in the visible region while 3 showed a strong absorption band near 430 nm with a shoulder, which depicts the π!π * transition due to the presence of curcumin ligand (Figure 2(a)). [55,59,60] This band might be important to get visible light-activated antibacterial responses. [55,59,60] The fluorescence property of complex 3 (at 10.0 μM concentration) was studied in aqueous DMSO solution (Figure 2).…”

“…[55,59,60] This band might be important to get visible light-activated antibacterial responses. [55,59,60] The fluorescence property of complex 3 (at 10.0 μM concentration) was studied in aqueous DMSO solution (Figure 2). Upon excitation with 425 nm, 3 displayed the emission maxima at ca.…”

“…[59] Recently, Thubaiti et al also showed enhanced antibacterial activity of curcumin upon coordinating with Zn 2 + against both gram-positive and gram-negative bacteria. [60] Herein, complexes, 1-3, have presented remarkable enhancement in the antibacterial activity against both gram (+) and gram (À ) bacterial strains upon low energy visible light (0.5 J cm À 2 , 400-700 nm) exposure (Figure 1). The light-activated antibacterial activity was supported by the DFT calculation, indicating the facile 1 O 2 generation efficiency of complex 3 after light irradiation.…”