Novel Microbial Palladium Nanoparticles with a High Photothermal Effect for Antibacterial Applications

Abstract

Novel biocompatible palladium nanoparticles (Pd-NPs) have been prepared by microorganisms via Bacillus megaterium Y-4. It was demonstrated that ultrasonication treatment of biologically reduced Pd-NPs impart a much higher absorption in NIR regions and a better photothermal conversion efficiency to the material. The as-prepared material showed excellent biocompatibility and antibacterial activity under NIR irradiation. In less than 10 min, the disinfection efficiency for a low dosage of Pd-NPs (20 mg/L) was 99.99% toward both Staphylococcus aureus and Escherichia coli. The exclusive and even dispersed microbial Pd-NPs display a high efficiency of photothermal conversion under the irradiation of NIR, which endows them with excellent antibacterial activity in a low dosage.

Polyethylenimine as a Versatile Simultaneous Reducing and Stabilizing Agent Enabling One-Pot Synthesis of Transition-Metal Nanoparticles: Fundamental Aspects and Practical Implications

“…Although the antimicrobial effect of AuNPs 65,66 and PdNPs 67,68 has been reported in previous investigations, there are still conflicting results and a lack of clarity regarding the antimicrobial activity and toxicity of such nanomaterials as well as the concentration range where they are indeed effective, especially concerning AuNPs. 69 Truly, the data reported herein underline a much more robust antimicrobial effect of the silver assemblies.…”

Supramolecular Photothermal Cascade Nano‐Reactor Enables Photothermal Effect, Cascade Reaction, and In Situ Hydrogelation for Biofilm‐Associated Tooth‐Extraction Wound Healing

“…Furthermore, the photothermal conversion efficiency of CPNC@GOx‐Fe 2+ was calculated to be 43.5% (Figure 2c), [ 42 ] which is higher than that of previously reported Pd nanosheets (27.6%), [ 43 ] nanomaterial gold nanorods (21%), [ 44 ] and Pd nanoparticles (37.2%). [ 45 ]…”

“…Furthermore, the photothermal conversion efficiency of CPNC@GOx-Fe 2+ was calculated to be 43.5% (Figure 2c), [42] which is higher than that of previously reported Pd nanosheets (27.6%), [43] nanomaterial gold nanorods (21%), [44] and Pd nanoparticles (37.2%). [45] GOx, as a natural enzyme, is a vital component in CPNC@GOx-Fe 2+ , and its catalytic activity is critical for the GOx-assisted cascade reaction. [46] To verify the effect of the CPNC@GOx-Fe 2+ assembly process on the GOx enzymatic activity, we performed a detailed assessment of the enzyme activity in the GOx, CPNC@GOx, and CPNC@GOx-Fe 2+ using the chromogenic reaction of 4-aminoantipyrine with phenol.…”

AIEgen orthopalladated hybrid polymers for efficient inactivation of the total coliforms in urban wastewater

“…Organopalladium tools are good inactivators of the world's best-characterized, ubiquitous, and adaptable organism, Escherichia coli [39,40]. Escherichia coli is the most representative microbial species of the faecal coliform group, in turn, part of the larger family of total coliforms, present in the digestive tracts of animals, in wastes, in plants, and in soil material.…”