Citation: Xiaopei HE, Jing HAN, Zhong YU, Na YE, Yi WAN. Preparation and antimicrobial properties of polyvinyl alcohol composite film based on Ag(Ⅰ) complex[J]. Chinese Journal of Inorganic Chemistry, ;2026, 42(3): 531-542. doi: 10.11862/CJIC.20250271 shu

Preparation and antimicrobial properties of polyvinyl alcohol composite film based on Ag(Ⅰ) complex

Xiaopei HE ¹ ,
Jing HAN ^1,, ,
Zhong YU ² ,
Na YE ¹ ,
Yi WAN ³

1.
Department of Materials Physics and Chemistry, Xi′an University of Technology, Xi′an 710048, China
2.
Department of Applied Chemistry, Xi′an University of Technology, Xi′an 710061, China
3.
Shaanxi Institute of Microbiology, Xi′an 710043, China

Corresponding author: Jing HAN, hanj@xaut.edu.cn
Received Date: 25 August 2025
Revised Date: 17 November 2025

Figures(5)

The antimicrobial activities of silver(Ⅰ) complexes can be enhanced by increasing the content and release of silver ions, which may also cause potential toxicity. Additionally, the powder form of silver(Ⅰ) complexes is not advantageous for clinical applications. To address the above challenges, an antimicrobial film based on silver(Ⅰ) complex was constructed through the following three design strategies. First, complex 1 was self-assembled using an antimicrobial ligand (indole-3-carboxylic acid) and tert-butylacetylene silver to enhance antimicrobial effects by releasing Ag⁺ and antimicrobial ligands simultaneously. Then, the third antimicrobial source, i.e., graphene oxide (GO), was introduced to prepare 1@GO composite with GO addition optimized by antimicrobial performance. Finally, 1@GO/PVA film was prepared by selecting polyvinyl alcohol (PVA) as a matrix for potential applications. The structure, photostability, and solution stability of 1 were characterized by IR spectra and powder X-ray diffraction. Ag⁺ releasing test showed the enhanced pH-responsive Ag⁺ release of 1. The results of the inhibition zones test showed weak antimicrobial effects of GO (1 000 μg·mL^-1) on Escherichia coli (E. coli), Pseudomonas aeruginosa (P. aeruginosa), Staphylococcus aureus (S. aureus), and Candida albicans (C. albicans) with increased inhibition zone diameters of 1.1, 2.5, 3.5, and 1.8 mm, respectively. 1 showed good broad-spectra antimicrobial activities against the four microorganisms, and diameters of inhibitory zones increased by 5.0, 10.5, 5.8, and 5.0 mm, respectively. SEM images of 1@GO (1∶1 of mass concentration ratio) exhibited that 1 was dispersed evenly in GO, exposing a large number of sharp edges. The diameters of inhibition zones for 1@GO(1∶1) against E. coli, S. aureus, and C. albicans increased by 6.2, 10.4, and 9.8 mm, respectively, which are larger than the algebraic sum of respective contributions of 1 and GO to the diameter of inhibition zones (6.1, 9.3, and 6.8 mm). This result indicated clearly the successful realization of synergistic antimicrobial effects of silver complex and GO. Minimum inhibitory concentration (MIC) results exhibited the best inhibitory effect of 1 on P. aeruginosa and S. aureus with low MIC values of 20 and 15 μg·mL^-1, respectively. After adding GO, MIC values of 1@GO against E. coli, P. aeruginosa, S. aureus, and C. albicans reduced to 5-10 μg·mL^-1, 5-10 μg·mL^-1, and 10-15 μg·mL^-1, respectively. 1(0.5%)@GO(1∶1)/PVA film displayed good antimicrobial properties for four strains, with the largest diameter of inhibition zones of 18.5 mm against P. aeruginosa.
- antimicrobial,
- silver complex,
- antimicrobial ligand,
- graphene oxide,
- polyvinyl alcohol
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沈阳化工大学材料科学与工程学院沈阳 110142