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Girard-Sahun F, Badets V, Lefrançois P, Sojic N, Clement F, Arbault S. Reactive Oxygen Species Generated by Cold Atmospheric Plasmas in Aqueous Solution: Successful Electrochemical Monitoring in Situ under a High Voltage System. Anal Chem 2019; 91:8002-8007. [PMID: 31247715 DOI: 10.1021/acs.analchem.9b01912] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Many investigations are dedicated to the detection and quantification of reactive oxygen and nitrogen species (RONS), particularly when generated in liquids exposed to cold atmospheric plasmas (CAPs). CAPs are partially ionized gases that can be obtained by applying a high electric field to a gas. A challenge is to get better insights on the plasma-liquid interactions in order to understand the induced effects on different targets (liquid, cells, tissues, etc.). As RONS are biochemically reactive, the difficulty lies in finding efficient methods to get both dynamic and quantitative data. Herein, we developed an innovative setup aimed at performing an in situ electrochemical monitoring of redox species generated by CAPs in a physiological buffer (PBS, pH 7.4). The challenge was to apply millivolt-potential variations and measure nanoampere Faradaic currents in the presence of ionization waves generated by micropulsed electric fields of some 10 kV·cm-1 amplitude and ampere-transient currents. This was fulfilled by using dedicated working ultramicroelectrodes (Pt-black UMEs) and protecting them, as well as the reference and counter electrodes, within insulated-earthed containers. In this condition, we succeeded in performing both cyclic voltammetry and chronoamperometry in situ, with a resolution equivalent to working in a static solution (subnanoampere currents). Thus, we monitored the accumulation over time of species (H2O2, NO2-) generated by CAPs in PBS and observed the mean dynamic of RONS chemistry during and after plasma exposition, particularly through the detection of a short-living species.
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Affiliation(s)
- Fanny Girard-Sahun
- UPPA , IPREM, CNRS UMR 5254 , 2 avenue Président Angot , 64000 Pau , France.,Univ. Bordeaux , CNRS, Bordeaux INP, ISM, UMR 5255 , F-33400 Talence , France
| | - Vasilica Badets
- Univ. Bordeaux , CNRS, Bordeaux INP, ISM, UMR 5255 , F-33400 Talence , France
| | - Pauline Lefrançois
- Univ. Bordeaux , CNRS, Bordeaux INP, ISM, UMR 5255 , F-33400 Talence , France
| | - Neso Sojic
- Univ. Bordeaux , CNRS, Bordeaux INP, ISM, UMR 5255 , F-33400 Talence , France
| | - Franck Clement
- UPPA , IPREM, CNRS UMR 5254 , 2 avenue Président Angot , 64000 Pau , France
| | - Stéphane Arbault
- Univ. Bordeaux , CNRS, Bordeaux INP, ISM, UMR 5255 , F-33400 Talence , France
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Abstract
Acinetobacter baumannii is a typically short, almost round, rod-shaped (coccobacillus) Gram-negative bacterium. It can be an opportunistic pathogen in humans, affecting people with compromised immune systems, and it is becoming increasingly important as a hospital-associated (nosocomial) infection. It has also been isolated from environmental soil and water samples. In this work, unlike conventional medical methods like antibiotics, the influence of atmospheric-pressure cold plasma on this bacterium is evaluated by means of a colony count technique and scanning electron microscopy. The plasma used here refers to streamers axially propagating into a helium channel penetrating the atmospheric air. The plasma is probed with high resolution optical emission spectroscopy and copious reactive species are unveiled under low-temperature conditions. Based on the experimental results, post-treatment (delayed) biochemical effects on Acinetobacter baumannii and morphological modifications appear dominant, leading to complete deactivation of this bacterium.
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Girard F, Peret M, Dumont N, Badets V, Blanc S, Gazeli K, Noël C, Belmonte T, Marlin L, Cambus JP, Simon G, Sojic N, Held B, Arbault S, Clément F. Correlations between gaseous and liquid phase chemistries induced by cold atmospheric plasmas in a physiological buffer. Phys Chem Chem Phys 2018; 20:9198-9210. [PMID: 29560996 DOI: 10.1039/c8cp00264a] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The understanding of plasma-liquid interactions is of major importance, not only in physical chemistry, chemical engineering and polymer science, but in biomedicine as well as to better control the biological processes induced on/in biological samples by Cold Atmospheric Plasmas (CAPs). Moreover, plasma-air interactions have to be particularly considered since these CAPs propagate in the ambient air. Herein, we developed a helium-based CAP setup equipped with a shielding-gas device, which allows the control of plasma-air interactions. Thanks to this device, we obtained specific diffuse CAPs, with the ability to propagate along several centimetres in the ambient air at atmospheric pressure. Optical Emission Spectroscopy (OES) measurements were performed on these CAPs during their interaction with a liquid medium (phosphate-buffered saline PBS 10 mM, pH 7.4) giving valuable information about the induced chemistry as a function of the shielding gas composition (variable O2/(O2 + N2) ratio). Several excited species were detected including N2+(First Negative System, FNS), N2(Second Positive System, SPS) and HO˙ radical. The ratios between nitrogen/oxygen excited species strongly depend on the O2/(O2 + N2) ratio. The liquid chemistry developed after CAP treatment was investigated by combining electrochemical and UV-visible absorption spectroscopy methods. We detected and quantified stable oxygen and nitrogen species (H2O2, NO2-, NO3-) along with Reactive Nitrogen Species (RNS) such as the peroxynitrite anion ONOO-. It appears that the RNS/ROS (Reactive Oxygen Species) ratio in the treated liquid depends also on the shielding gas composition. Eventually, the composition of the surrounding environment of CAPs seems to be crucial for the induced plasma chemistry and consequently, for the liquid chemistry. All these results demonstrate clearly that for physical, chemical and biomedical applications, which are usually achieved in ambient air environments, it is necessary to realize an effective control of plasma-air interactions.
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Affiliation(s)
- Fanny Girard
- UPPA, IPREM, CNRS UMR 5254, 2 Avenue Président Angot, 64000 Pau, France. and Univ. BORDEAUX, ISM, CNRS UMR 5255, NSysA Group, ENSCBP, 16 Avenue Pey Berland, 33607 Pessac, France.
| | - Mathieu Peret
- UPPA, IPREM, CNRS UMR 5254, 2 Avenue Président Angot, 64000 Pau, France.
| | - Natacha Dumont
- UPPA, IPREM, CNRS UMR 5254, 2 Avenue Président Angot, 64000 Pau, France.
| | - Vasilica Badets
- Univ. BORDEAUX, ISM, CNRS UMR 5255, NSysA Group, ENSCBP, 16 Avenue Pey Berland, 33607 Pessac, France.
| | - Sylvie Blanc
- UPPA, IPREM, CNRS UMR 5254, 2 Avenue Président Angot, 64000 Pau, France.
| | - Kristaq Gazeli
- UPPA, IPREM, CNRS UMR 5254, 2 Avenue Président Angot, 64000 Pau, France.
| | - Cédric Noël
- Univ. Lorraine, CNRS UMR 7198, Institut Jean Lamour, Site Artem, CS 50840, 54011 Nancy Cedex, France
| | - Thierry Belmonte
- Univ. Lorraine, CNRS UMR 7198, Institut Jean Lamour, Site Artem, CS 50840, 54011 Nancy Cedex, France
| | - Laurent Marlin
- UPPA, Atelier de Physique, Avenue de l'université, BP1155, 64013 Pau Cedex, France
| | - Jean-Pierre Cambus
- Univ. Paul Sabatier, Hopital Rangueil, Laboratoire Hématologie, Bât L2, 1 Avenue du Professeur Jean Poulhès, TSA 50032, 31059 Toulouse Cedex 9, France
| | - Guillaume Simon
- UPPA, IPREM, CNRS UMR 5254, 2 Avenue Président Angot, 64000 Pau, France.
| | - Neso Sojic
- Univ. BORDEAUX, ISM, CNRS UMR 5255, NSysA Group, ENSCBP, 16 Avenue Pey Berland, 33607 Pessac, France.
| | | | - Stéphane Arbault
- Univ. BORDEAUX, ISM, CNRS UMR 5255, NSysA Group, ENSCBP, 16 Avenue Pey Berland, 33607 Pessac, France.
| | - Franck Clément
- UPPA, IPREM, CNRS UMR 5254, 2 Avenue Président Angot, 64000 Pau, France.
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