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Influence of Retrogradation on KI–Starch Visualization of Reactive Oxygen Species Emitted by Plasma Jets
IEEE Transactions on Plasma Science ( IF 1.5 ) Pub Date : 2021-06-02 , DOI: 10.1109/tps.2021.3083400
Fumiaki Mitsugi , Mizuki Wago , Ryuji Sakamoto , Keisuke Nishida , Toshiyuki Kawasaki

Plasma jets have been widely researched in the fields of medicine, biology, and agriculture and their positive effects were reported. To understand the working mechanism of plasma–target interaction, the spatial distribution of reactive oxygen species (ROS) at the target’s surface should be examined as they are considered to be the most affectable factor to treat the target. The authors have used KI–starch method in the form of gel or liquid, which uses reactions among potassium iodide, starch, water, and oxidative species, to visualize the distribution of ROS. This method gives information regarding the distribution of ROS by coloration; however, the retrogradation of starch possibly influences on the visualization especially in a liquid KI–starch reagent. In this article, the visualization on the distribution of ROS was done via the liquid KI–starch reagent during plasma jets’ irradiation with different helium gas flow rates from 1 to 4 L/min. The retrogradation of starch was confirmed when the gas flow rate was higher than 3 L/min, because the reagent’s surface was cooled down, which incapacitated the ability of coloration from the reagent. It was revealed that a ring-like coloration pattern could be observed at the gas flow rate of 3 L/min, because the coloration occurred at the outside of an uncolored circular region where the retrogradation of starch was formed by the gas flow and insensitive to ROS.

中文翻译:

回生对等离子射流释放的活性氧物质的 KI-淀粉可视化的影响

等离子射流在医学、生物学和农业领域得到了广泛的研究,并报道了它们的积极作用。要了解等离子体与靶标相互作用的工作机制,应检查靶标表面活性氧 (ROS) 的空间分布,因为它们被认为是处理靶标的最影响因素。作者使用凝胶或液体形式的 KI-淀粉方法,该方法利用碘化钾、淀粉、水和氧化物质之间的反应来可视化 ROS 的分布。该方法通过着色提供有关 ROS 分布的信息;然而,淀粉的回生可能会影响可视化,尤其是在液体 KI-淀粉试剂中。在本文中,ROS 分布的可视化是在等离子射流辐照过程中通过液态 KI-淀粉试剂完成的,氦气流速从 1 到 4 L/min。当气体流速高于 3 L/min 时,证实了淀粉的回生,因为试剂表面被冷却,使试剂失去着色能力。结果表明,在 3 L/min 的气体流速下可以观察到环状着色图案,因为着色发生在未着色的圆形区域的外部,该区域由气流形成淀粉回生,并且对气体不敏感。活性氧。因为试剂的表面已经冷却,这使试剂无法着色。结果表明,在 3 L/min 的气体流速下可以观察到环状着色图案,因为着色发生在未着色的圆形区域的外部,该区域由气流形成淀粉回生,并且对气体不敏感。活性氧。因为试剂的表面已经冷却,这使试剂无法着色。结果表明,在 3 L/min 的气体流速下可以观察到环状着色图案,因为着色发生在未着色的圆形区域的外部,该区域由气流形成淀粉回生,并且对气体不敏感。活性氧。
更新日期:2021-07-23
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