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Pidal JMG, Fiori S, Scroccarello A, Della Pelle F, Maggio F, Serio A, Ferraro G, Escarpa A, Compagnone D. Laser-induced 2D/0D graphene-nanoceria freestanding paper-based films for on-site hydrogen peroxide monitoring in no-touch disinfection treatments. Mikrochim Acta 2024; 191:361. [PMID: 38822891 DOI: 10.1007/s00604-024-06427-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2024] [Accepted: 05/10/2024] [Indexed: 06/03/2024]
Abstract
A one-shot CO2 laser-based strategy to generate conductive reduced graphene oxide (rGO) decorated with nanoceria (nCe) is proposed. The 2D/0D rGO-nCe films, integrated as catalytic sensing layers in paper-based sensors, were employed for on-site monitoring of indoor fogging treatments against Listeria monocytogenes (Lm), a ubiquitous pathogenic bacterium. The rGO-nCe laser-assisted synthesis was optimized to preserve the rGO film morphological and electron-transfer features and simultaneously integrate catalytic nCe. The films were characterized by microscopical (SEM), spectroscopical (EDX, Raman, and FTIR), and electrochemical techniques. The most performing film was integrated into a nitrocellulose substrate, and the complete sensor was assembled via a combination of xurography and stencil printing. The rGO-nCe sensor's catalytic activity was proved toward the detection of H2O2, obtaining sensitive determination (LOD = 0.3 µM) and an extended linear range (0.5-1500 µM). Eventually, the rGO-nCe sensor was challenged for the real-time continuous monitoring of hydrogen peroxide aerosol during no-touch fogging treatment conducted following the EU's recommendation for biocidal product use. Treatment effectiveness was proved toward three Lm strains characterized by different origins, i.e., type strain ATCC 7644, clinical strain 338, and food strain 641/6II. The sensor allows for discrimination and quantification treatments at different environmental biocidal amounts and fogging times, and correlates with the microbiological inhibition, promoting the proposed sensor as a useful tool to modulate and monitor no-touch treatments.
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Affiliation(s)
- José M Gordón Pidal
- Department of Analytical Chemistry, Physical Chemistry and Chemical Engineering, University of Alcalá, Alcalá de Henares, Madrid, 28871, Spain
- Department of Bioscience and Technology for Food, Agriculture and Environment, University of Teramo, Campus "Aurelio Saliceti" Via R. Balzarini 1, Teramo, 64100, Italy
| | - Selene Fiori
- Department of Bioscience and Technology for Food, Agriculture and Environment, University of Teramo, Campus "Aurelio Saliceti" Via R. Balzarini 1, Teramo, 64100, Italy
| | - Annalisa Scroccarello
- Department of Bioscience and Technology for Food, Agriculture and Environment, University of Teramo, Campus "Aurelio Saliceti" Via R. Balzarini 1, Teramo, 64100, Italy
| | - Flavio Della Pelle
- Department of Bioscience and Technology for Food, Agriculture and Environment, University of Teramo, Campus "Aurelio Saliceti" Via R. Balzarini 1, Teramo, 64100, Italy.
| | - Francesca Maggio
- Department of Bioscience and Technology for Food, Agriculture and Environment, University of Teramo, Campus "Aurelio Saliceti" Via R. Balzarini 1, Teramo, 64100, Italy
| | - Annalisa Serio
- Department of Bioscience and Technology for Food, Agriculture and Environment, University of Teramo, Campus "Aurelio Saliceti" Via R. Balzarini 1, Teramo, 64100, Italy
| | - Giovanni Ferraro
- Department of Chemistry "Ugo Schiff" and CSGI, University of Florence, Via Della Lastruccia 3, Sesto Fiorentino, Florence, I-50019, Italy
| | - Alberto Escarpa
- Department of Analytical Chemistry, Physical Chemistry and Chemical Engineering, University of Alcalá, Alcalá de Henares, Madrid, 28871, Spain.
| | - Dario Compagnone
- Department of Bioscience and Technology for Food, Agriculture and Environment, University of Teramo, Campus "Aurelio Saliceti" Via R. Balzarini 1, Teramo, 64100, Italy.
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Jinadatha C, Navarathna T, Negron-Diaz J, Ghamande G, Corona BA, Adrianza A, Coppin JD, Choi H, Chatterjee P. Understanding the significance of microbiota recovered from health care surfaces. Am J Infect Control 2024; 52:220-224. [PMID: 38206212 DOI: 10.1016/j.ajic.2023.11.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2023] [Revised: 11/07/2023] [Accepted: 11/08/2023] [Indexed: 01/12/2024]
Abstract
BACKGROUND Microbial contamination of hospital surfaces remains despite adherence to routine disinfection. Our study demonstrates bioburden from various types of hospital high-touch surfaces and the pathogenicity of all bacteria recovered. METHODS Several high-touch hospital surfaces from a single medical-surgical unit were sampled and cultured using replicate organism detection and counting (RODAC) Tryptic Soy agar plates. Colonies were then subcultured to blood agar plates and speciated using MALDI-TOF. The local microbiology laboratory database was queried for any clinical isolate match with the environmental samples recovered. RESULTS Manikins, bed rails, and workstations-on-wheels were the most contaminated surfaces with the largest variety of bacteria isolated from manikins and bed rails. A total of 60 different types of pathogens were isolated, 18 of which were well-known pathogens, and 7 were classified as important in the health care setting by CDC. Our clinical microbiology laboratory identified 29 of 60 hospital surface bacteria in clinical isolates. Urine, soft tissue, and blood were the most common sources of clinical isolates. CONCLUSIONS Surfaces in the health care environment harbor both well-known and not-so-well-known human pathogens. Several not-so-well-known pathogens are skin flora or environmental bacteria, which in the right setting, can become pathogenic and cause diseases including meningitis, brain abscess, endocarditis, and bacteremia.
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Affiliation(s)
- Chetan Jinadatha
- Department of Research, Central Texas Veterans Health Care System, Temple, TX
| | - Thanuri Navarathna
- Department of Research, Central Texas Veterans Health Care System, Temple, TX
| | - Juan Negron-Diaz
- Department of Research, Central Texas Veterans Health Care System, Temple, TX; Department of Internal Medicine, Baylor Scott and White Health, Temple, TX
| | - Gautam Ghamande
- Department of Research, Central Texas Veterans Health Care System, Temple, TX
| | - Brandon A Corona
- Department of Research, Central Texas Veterans Health Care System, Temple, TX
| | - Andres Adrianza
- Department of Research, Central Texas Veterans Health Care System, Temple, TX; Department of Internal Medicine, Baylor Scott and White Health, Temple, TX
| | - John D Coppin
- Department of Research, Central Texas Veterans Health Care System, Temple, TX
| | - Hosoon Choi
- Department of Research, Central Texas Veterans Health Care System, Temple, TX
| | - Piyali Chatterjee
- Department of Research, Central Texas Veterans Health Care System, Temple, TX.
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