Ducrozet F, Sebastian A, Garcia Villavicencio CJ, Ptasinska S, Sicard-Roselli C. Quantifying hydroxyl radicals generated by a low-temperature plasma using coumarin: methodology and precautions.
Phys Chem Chem Phys 2024;
26:8651-8657. [PMID:
38436422 DOI:
10.1039/d4cp00040d]
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Abstract
The detection and quantification of hydroxyl radicals (HO˙) generated by low-temperature plasmas (LTPs) are crucial for understanding their role in diverse applications of plasma radiation. In this study, the formation of HO˙ in the irradiated aqueous phase is investigated at various plasma parameters, by probing them indirectly using the coumarin molecule. We propose a quantification methodology for these radicals, combining spectrophotometry to study the coumarin reaction with hydroxyl radicals and fluorimetry to evaluate the formation yield of the hydroxylated product, 7-hydroxycoumarin. Additionally, we thoroughly examine and discuss the impact of pH on this quantification process. This approach enhances our comprehension of HO˙ formation during LTP irradiation, adding valuable insights to plasma's biological applications.
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