Masking Phosphate with Rare-Earth Elements Enables Selective Detection of Arsenate by Dipycolylamine-ZnII Chemosensor

Nutsara Mekjinda, Supho Phunnarungsi, Vithaya Ruangpornvisuti, Raymond J. Ritchie, Itaru Hamachi, Akio Ojida, Jirarut Wongkongkatep

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Abstract

Functional reassessment of the phosphate-specific chemosensors revealed their potential as arsenate detectors. A series of dipicolylamine (Dpa)-ZnII chemosensors were screened, among which acridine Dpa-ZnII chemosensor showed the highest capability in sensing arsenate. The presence of excess ZnII improved sensitivity and strengthened the binding between acridine Dpa-ZnII complex to arsenate as well as phosphate. However, due to their response to phosphate, these sensors are not suited for arsenate detection when phosphate is also present. This study demonstrated for the first time that rare-earth elements could effectively mask phosphate, allowing the specific fluorescence detection of arsenate in phosphate-arsenate coexisting systems. In addition, detection of arsenate contamination in the real river water samples and soil samples was performed to prove its practical use. This sensor was further employed for the visualization of arsenate and phosphate uptake in vegetables and flowering plants for the first time, as well as in the evaluation of a potent inhibitor of arsenate/phosphate uptake.

Original languageEnglish
Article number2656
JournalScientific reports
Volume10
Issue number1
DOIs
Publication statusPublished - Dec 1 2020

All Science Journal Classification (ASJC) codes

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    Mekjinda, N., Phunnarungsi, S., Ruangpornvisuti, V., Ritchie, R. J., Hamachi, I., Ojida, A., & Wongkongkatep, J. (2020). Masking Phosphate with Rare-Earth Elements Enables Selective Detection of Arsenate by Dipycolylamine-ZnII Chemosensor. Scientific reports, 10(1), [2656]. https://doi.org/10.1038/s41598-020-59585-0