Investigation of the Antibacterial Effects, Skin Sensitivity, and Irritant Properties of a Lubricating Gel Containing Silver/Zinc Oxide Nanostructure and Lidocaine in an Animal Model
Bibliographic record
Abstract
Background: Urinary tract infections (UTIs), predominantly catheter-associated (CAUTIs), cause significant morbidity (~380,000 cases), mortality (~9,000-13,000 deaths), and healthcare costs annually. CAUTIs initiate via bacterial biofilm formation on catheters. Current antimicrobial catheters (e.g., silver ions, antibiotics) face limitations like poor efficacy, resistance, and non-adjustability. Nanostructure coatings offer promise; notably, combining Ag/ZnO nanostructures leverages enhanced biocompatibility and potent antibacterial effects for novel CAUTI prevention strategies. Methods: AgNPs were chemically synthesized via silver nitrate reduction (sodium citrate/sodium borohydride); ZnO-NPs were prepared from zinc acetate/sodium hydroxide. A lubricant gel containing 2% lidocaine and Ag/ZnO nanostructures (2:8 v/v ratio) was formulated. Nanostructure characterization included DLS, TEM, and ICP-OES. Antibacterial efficacy was assessed via disk diffusion and microdilution (MIC/MBC) against S. aureus and P. aeruginosa. Biocompatibility was evaluated via rabbit ocular irritability and Guinea Pig Maximization Test (ISO 10993-10). Results: DLS/TEM characterization showed AgNPs (24.4 nm, spherical) and ZnO-NPs (52.48 nm, clustered) were mono-disperse (PDI ~1 and 0.667). Zeta potential confirmed stability (Ag: -20.7 mV; ZnO: -0.709 mV). ICP-OES quantified concentrations (Ag: 25 ppm; ZnO: 970 ppm). Antibacterial assays revealed weak AgNP activity (MIC/MBC >12.5 μg/mL for both pathogens) but potent ZnO-NP effects (e.g., S. aureus MIC: 0.406 μg/mL). Ag/ZnO hybrids exhibited enhanced efficacy, especially against S. aureus (MIC: 0.02/3.12 μg/mL). The gel was non-irritating (rabbit ocular test) and non-sensitizing (Guinea Pig Maximization Test). Conclusion: The active formulation consisting of mixed silver and zinc oxide nanostructures combined with a medical lubricant containing 4% lidocaine demonstrates effective antibacterial activity against Pseudomonas aeruginosa and Staphylococcus aureus, while exhibiting no irritant or sensitizing properties in laboratory animals.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".