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A New Highly Sensitive Optical Sensor Based on congo-red for the Determination of Thorium(Ⅳ) in Aqueous Solution

Journal of Analysis and Testing 2023年第4期7卷 416-424页

作者： Abdollah Yari Samaneh Penhani Faculty of Chemistry Lorestan UniversityKhorramabad 68151-44316Iran

This essay explores the use of the sol-gel method based on the congo-red reagent as an effective approach to create an optical sensor for the detection and tracking of Thorium(Ⅳ)(Th^(4+)).Upon exposure to a Th^(4+)-containing solution,the sensor exhibits significant absorption signal change that linearly correlates with Th^(4+)ion concentration across a wide *** is capable of detecting Th^(4+)ion in the linear dynamic range of 1.7×10^(-8)to 1.1×10^(-3)mol/L,with a detection limit of 5.3×10^(-9)mol/*** optode’s exceptional porous network,created through the sol-gel technique,contributes to its commendable performance,reliable repeatability,improved sensitivity,swift response time,and discerning selectivity.

关键词： congo-red Optical sensor Sol-gel Thorium(IV)

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Gastric cancer development after the successful eradication of Helicobacter pylori

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World Journal of Gastrointestinal Oncology 2016年第3期8卷 271-281页

作者： Kaname Uno Katsunori Iijima Tooru Shimosegawa Division of Gastroenterology Tohoku University Hospital

Gastric cancer(GC) develops as a result of inflammationassociated carcinogenesis due to Helicobacter pylori(H. pylori) infection and subsequent defects in genetic/epigenetic events. Although the indication for eradication therapy has become widespread, clinical studies have revealed its limited effects in decreasing the incidence of GC. Moreover, research on biopsy specimens obtained by conventional endoscopy has demonstrated the feasibility of the restoration of some genetic/epigenetic alterations in the gastric mucosa. Practically, the number of sporadic cases of primary/metachronous GC that emerge after successful eradication has increased, while on-going guidelines recommend eradication therapy for patients with chronic gastritis and those with background mucosa after endoscopic resection for GC. Accordingly, regular surveillance of numerous individuals who have received eradication therapy is recommended despite the lack of biomarkers. Recently, the focus has been on functional reversibility after successful eradication as another cue to elucidate the mechanisms of restoration as well as those of carcinogenesis in the gastric mucosa after H. pylori eradication. We demonstrated that congo-red chromoendoscopy enabled the identification of the multifocal distribution of functionally irreversible mucosa compared with that of restored mucosa after successful eradication in individuals at extremely high risk for GC. Further research that uses functional imaging may provide new insights into the mechanisms of regeneration and carcinogenesis in the gastric mucosa post-eradication and may allow for the development of useful biomarkers.

关键词： Helicobacter pylori eradication Gastric cancer congo-red chromoendoscopy Biomarker

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