Quantification of Plasma-Produced Hydroxyl Radicals in Solution and their Dependence on the pH

Tampieri, F.; Ginebra, Maria‐Pau; Canal, Cristina

doi:10.1021/acs.analchem.0c04906

Cited by 74 publications

(43 citation statements)

References 35 publications

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“…The argon jet plasma applied for the study delivers • OH and O 2 – radicals along with singlet oxygen O 2 1 Δ g and atomic oxygen O( 3 P) radicals, ultimately yielding H 2 O 2 as long-lived reactive species. 42 − 44 …”

Section: Introductionmentioning

confidence: 99%

d-Glucose Oxidation by Cold Atmospheric Plasma-Induced Reactive Species

et al. 2022

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The glucose oxidation cascade is fascinating; although oxidation products have high economic value, they can manipulate the biological activity through posttranslational modification such as glycosylation of proteins, lipids, and nucleic acids. The concept of this work is based on the ability of reactive species induced by cold atmospheric plasma (CAP) in aqueous liquids and the corresponding gas–liquid interface to oxidize biomolecules under ambient conditions. Here, we report the oxidation of glucose by an argon-based dielectric barrier discharge plasma jet (kINPen) with a special emphasis on examining the reaction pathway to pinpoint the most prominent reactive species engaged in the observed oxidative transformation. Employing d -glucose and d -glucose- 13 C 6 solutions and high-resolution mass spectrometry and ESI-tandem MS/MS spectrometry techniques, the occurrence of glucose oxidation products, for example, aldonic acids and aldaric acids, glucono- and glucaro-lactones, as well as less abundant sugar acids including ribonic acid, arabinuronic acid, oxoadipic acid, 3-deoxy-ribose, glutaconic acid, and glucic acid were surveyed. The findings provide deep insights into CAP chemistry, reflecting a switch of reactive species generation with the feed gas modulation (Ar or Ar/O 2 with N 2 curtain gas). Depending on the gas phase composition, a combination of oxygen-derived short-lived hydroxyl ( • OH)/atomic oxygen [O( 3 P)] radicals was found responsible for the glucose oxidation cascade. The results further illustrate that the presence of carbohydrates in cell culture media, gel formulations (agar), or other liquid targets (juices) modulate the availability of CAP-generated species in vitro . In addition, a glycocalyx is attached to many mammalian proteins, which is essential for the respective physiologic role. It might be questioned if its oxidation plays a role in CAP activity.

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Section: Introductionmentioning

confidence: 99%

d-Glucose Oxidation by Cold Atmospheric Plasma-Induced Reactive Species

et al. 2022

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“…The pH value 6.85±0.01 in M3 which is showing a gradual increase with respect to the time. This could be due to the increase in hydroxyl ° OH radicals’ generation during cold plasma generation 49 . A contradictory result was found in cold plasma treated milk 19 .…”

Section: Resultsmentioning

confidence: 99%

“…During storage, for the control milk: the pH decreased to 4.2±0.013 on 3 rd day of storage; whereas a gradual increase in pH was observed for the treated sample on the 7 th day of storage for M1, M2 and M3 plasma bubbling treated sample. The sudden increase in pH could be due to the OH ° radical production in cold plasma technology 49 : the closed glass vessel could maintain the OH • radical formed on the cold plasma generation during storage at refrigerator condition. However, the M1 spoiled on the 14 th day of storage, M2 on the 28 th day and M3 on 35 days of storage with pH value 4.1±0.015, 4.0± 0.012, 4.1±0.015 respectively, the decrease could be explained due to the acidification of milk 65 (Table 2).…”

Section: Resultsmentioning

confidence: 99%

STability and Shelf-Life of Plasma Bubbling Treated Cow Milk

Dash

Jaganmohan

2022

Preprint

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The demand of consumers for naturality of food with minimal processing was forced to the scientists for the discovery of non-thermal plasma which is now an emerging technology for the preservation and decontamination of highly perishable food such as milk. In this study, the microbial and physicochemical characteristics of plasma bubbling of raw cow milk were analysed and a comparison of boiled raw cow milk, commercially available pasteurised and UHT milk was observed. Again, shelf-life study was experimented for the plasma bubbling of milk with respect to raw cow milk sample (control). The plasma bubbling was generated at a voltage (200V), the flow rate of air 10 litres/hour (L/h) and applied to fresh cow milk for 5, 10, and 15 minutes (min) of time interval with 100 mL of the sample volume at room temperature. A significant reduction was observed in coliform and yeast at 200V, 10L/h, 15 min time interval of treatment. The pH of the milk was increased significantly to 6.85 after exposure to plasma bubbling. Whereas, a decreasing value was noticed in colour, total soluble solids (TSS) and titratable acid (TA) with respect to time given by the plasma bubbling. The result of the study indicates that plasma bubbling at (200V, 10L/h,100mL,15 min) treatment improves the quality of milk. This study shows that indirect dielectric barrier discharge (DBD) (plasma bubbling) may offer an effective microbial reduction in barley without affecting the quality attributes. The plasma bubbling processing is an initiative for cow raw milk pasteurisation, which could have a future perspective on industrial food applications.

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“…Each treatment was done in triplicate. Water evaporation during the treatment of liquid samples was quantified in a previous work under the same experimental conditions reported here [ 15 ] and taken into account in subsequent analyses.…”

Section: Methodsmentioning

confidence: 99%

Can we remove tattoos with non‐thermal atmospheric plasma?

Tampieri

Araguz

Canal

2022

Plasma Processes & Polymers

Self Cite

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Current methods for tattoo removal are long, costly and have drawbacks such as scarring among others. Looking for alternatives, here we assess the feasibility of non-thermal plasma (NTP) as a standalone method for the removal of tattoos. We report the results of atmospheric pressure plasma jet treatment of real tattoo inks suspensions in water and in gelatin (liquid or as a solid film), selected as a model of skin.

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Quantification of Plasma-Produced Hydroxyl Radicals in Solution and their Dependence on the pH

Cited by 74 publications

References 35 publications

d-Glucose Oxidation by Cold Atmospheric Plasma-Induced Reactive Species

d-Glucose Oxidation by Cold Atmospheric Plasma-Induced Reactive Species

STability and Shelf-Life of Plasma Bubbling Treated Cow Milk

Can we remove tattoos with non‐thermal atmospheric plasma?

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