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Rhodamine Dye Transfer From Hydrogel to Nanospheres for the Chemical Detection of Potassium Ions

Rhodamine Dye Transfer From Hydrogel to Nanospheres for the Chemical Detection of Potassium Ions

Wei Yang, Jingying Zhai, Xiaojiang Xie

Analyst. 2019 Sep 21;144(18):5617-5623.

PMID: 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.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP137993410	Rhodamine 800		137993-41-0	Price

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