Acta Phys. -Chim. Sin. ›› 2018, Vol. 34 ›› Issue (5): 543-550.doi: 10.3866/PKU.WHXB201709291

• ARTICLE • Previous Articles    

Synthesis, Characterization, and Antibacterial Activity of Rare Earth-Catechin Complexes

Kang YU1,Cuicui TIAN1,Xia LI1,Xuepin LIAO1,2,3,*(),Bi SHI1,2,3   

  1. 1 Department of Biomass and Leather Engineering, Sichuan University, Chengdu 610065, P. R. China
    2 Key Laboratory of Leather Chemistry and Engineering of Ministry of Education, Sichuan University, Chengdu 610065, P. R. China
    3 National Engineering Laboratory for Clean Technology of Leather Manufacture, Sichuan University, Chengdu 610065, P. R. China
  • Received:2017-07-31 Published:2018-01-24
  • Contact: Xuepin LIAO
  • Supported by:
    the National Technology Improvement and Industrialization Project of Fundamental Materials, China


Three kinds of novel coordination compounds [Re3+-C] (Re = La, Gd, Er; C = Catechin) were synthesized by the liquid-phase method, and characterized by Fourier transform infrared (FT-IR) spectroscopy, ultraviolet-visible (UV) spectrophotometry, X-ray photoelectron spectroscopy (XPS), and coordination number determination. The results indicated that the coordination number of the complexes is 8. Moreover, the antibacterial activities of Re3+-C against Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa, and Salmonella were evaluated by the Oxford cup, minimum inhibition concentration (MIC), and minimum bactericidal concentration (MBC) approaches. Compared with Re3+ and C, the as-prepared complexes exhibited excellent antimicrobial activity toward the four strains. The MIC of Gd3+-C to these food-borne bacteria was 1.550, 0.0968, 0.775, and 1.550 μmol·mL−1, respectively, while the corresponding MBC values were 3.100, 0.194, 1.550, and 1.550 μmol·mL−1. It is clear that the Gd3+-C complex showed the best antibacterial and germicidal activity against S. aureus.

Key words: Catechin, Rare earth, Complex, Food-borne bacteria, Antibacterial activity