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. 2017 Aug 21;7:8395. doi: 10.1038/s41598-017-08725-0

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Changes in pH, OH radical level, and NO level in saline or artificial saliva after plasma treatment for 1 min or 5 min. (a) pH of saline and artificial saliva after gas or plasma treatment. (b) OH radical level in saline and artificial saliva after gas or plasma treatment. (c) Levels of NO species in saline and artificial saliva after gas or plasma treatment. Levels of OH radical and NO are indicated by fluorescence intensity of terephthalic acid (TA) and 4-Amino-5-Methylamino-2′,7′-Difluorofluorescein combined with OH radical and NO, respectively. All values are means ± standard deviations of nine measurements. *P < 0.05.