Rhodamine dye transfer from hydrogel to nanospheres for the chemical detection of potassium ions.
Analyst
; 144(18): 5617-5623, 2019 Sep 21.
Article
em En
| MEDLINE
| ID: mdl-31432884
ABSTRACT
Smart hydrogels incorporating various functional nanomaterials are becoming popular tools for chemical sensing. Here, ion-exchange nanospheres composed of the block copolymer Pluronic F-127 played the role of a scavenger for a signal transducer dye (Rhodamine 800) in a three-phase based optical detection system for potassium ions. Rhodamine 800, a positively charged dye, was incorporated into a hydrogel together with the potassium ionophore valinomycin and an ion-exchanger (Na+R-). The concentration of Rhodamine 800 in the aqueous sample was kept low by the nanospheres containing Na+R-. Consequently, the detection limit (0.3 µM) of the three-phase based system was shifted 2 orders of magnitude lower compared with those of previously reported two-phase based sensing systems. The concept of controlling the dye transfer among the three phases provided a new train of thought for the design of ionophore-based chemical sensors.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Tipo de estudo:
Diagnostic_studies
Idioma:
En
Revista:
Analyst
Ano de publicação:
2019
Tipo de documento:
Article
País de afiliação:
China