Ionic liquid-based dye: A “Dyed plasticizer” for rapid and highly sensitive anion optodes based on a plasticized PVC membrane

Mizuta, Tatsumi; Sueyoshi, Kenji; Endo, Tatsuro; Hisamoto, Hideaki

doi:10.1016/j.snb.2017.11.183

Cited by 19 publications

(11 citation statements)

References 58 publications

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“…Thus, the sensitivity is generally determined by the dye concentration and membrane thickness according to the Lambert–Beer law. On the other hand, we recently developed an IL-based colorimetric membrane (IL-CM), which is composed of a lipophilic IL-based dye acting as a colorimetric plasticizer 8 , 15 – 19 . The IL-CM contains an extremely high concentration of dye in a thinner membrane (< 1 μm), realizing extreme sensitivity and response speed.…”

Section: Introductionmentioning

confidence: 99%

Highly sensitive optical ion sensor with ionic liquid-based colorimetric membrane/photonic crystal hybrid structure

Kawasaki

Oishi

Kobayashi

et al. 2020

Sci Rep

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An ionic liquid-based thin (~ 1 µm) colorimetric membrane (CM) is a key nano-tool for optical ion sensing, and a two-dimensional photonic crystal slab (PCS) is an important nano-platform for ultimate light control. For highly sensitive optical ion sensing, this report proposes a hybrid of these two optical nano-elements, namely, a CM/PCS hybrid. This structure was successfully fabricated by a simple and rapid process using nanoimprinting and spin-coating, which enabled control of the CM thickness. Optical characterization of the hybrid structure was conducted by optical measurement and simulation of the reflection spectrum, indicating that the light confined in the holes of the PCS was drastically absorbed by the CM when the spectrum overlapped with the absorption spectrum of the CM. This optical property obtained by the hybridization of CM and PCS enabled drastic improvement in the absorption sensitivity in Ca ion sensing, by ca. 78 times compared to that without PCS. Experimental and simulated investigation of the relation between the CM thickness and absorption sensitivity enhancement suggested that the controlled light in the PCS enhanced the absorption cross-section of the dye molecules within the CM based on the enhanced local density of states. This highly sensitive optical ion sensor is expected to be applied for micro-scale bio-analysis like cell-dynamics based on reflectometric Ca ion detection.

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Section: Introductionmentioning

confidence: 99%

Highly sensitive optical ion sensor with ionic liquid-based colorimetric membrane/photonic crystal hybrid structure

Kawasaki

Oishi

Kobayashi

et al. 2020

Sci Rep

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“…Reversible ion-selective sensors based on lipophilic anion exchangers were suggested for the measurement of anions. − The selectivity pattern of the described sensors correlates with the classical Hofmeister series. − …”

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confidence: 96%

Influence of Electrolyte Coextraction on the Response of Indicator-Based Cation-Selective Optodes

2020

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Here, we report on systematic investigation of the impact of coextraction of the aqueous electrolyte and anion interference on the response of cation-selective bulk optodes. It is evident that to deliberately manage the properties of chemical sensors and to apply them in routine analysis, one should have exhaustive insight into their operation mechanism. Despite the extensive research in the field of ionophore-based optodes and numerous attempts for their practical application, the understanding of how coextraction of an aqueous electrolyte influences its response characteristics has not been developed thus far. Meanwhile, the electrolyte coextraction determines the detection limits of analogous ion-selective electrodes. A theoretical model based on phase distribution equilibrium is proposed to quantitatively describe the effect of Donnan exclusion failure on the response of polymeric plasticized optodes. The theoretical conclusions are confirmed by the results obtained with Na+/pH-selective optodes based on a neutral chromoionophore as a model system in solutions containing anions of various lipophilicities (Cl–, NO3 –, I–, SCN–, and ClO4 –). For the first time, it is shown that coextraction leads to a significant shift of the response range of the optodes as well as to nonmonotonic response curves due to the transition from cationic to anionic response. An approach to estimate the coextraction constants of electrolytes from the optode response curves is proposed. The limitations in the applicability of optodes due to co-ion interference are explored. It is found that neglecting anion interference can cause dramatic errors in the results of analyses with optical sensors.

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“…[21][22][23][24] Recently, our group developed a plasticizer-free PVC membrane, which was composed of an ionic liquid-based dye (IL-Dye) in order to overcome a limitation of the dye solubility in the PVC membrane. [25][26][27] The IL-Dye serves dual functions of a lipophilic pH indicator dye (chromophore) and a plasticizer. In the IL-Dye-containing membrane, an extremely high concentration of the dye was realized, making the absorbance sensitivity very high, although the membrane thickness was very thin (< 1 μm).…”

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confidence: 99%

Enzyme-responsive Fluorescent Ionic Liquid

et al. 2020

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Herein, we describe the development of a novel material, "enzyme-responsive fluorescent ionic liquid", which enabled a highly sensitive detection of alkaline phosphatase (ALP). We prepared a plasticized poly(vinyl chloride) (PVC) membrane using this new material as a plasticizer and quantified ALP in aqueous solutions. Preliminary results suggested that the PVC membrane responded to ALP at an interface between the membrane and the sample solution with anion extraction to maintain electroneutrality in the membrane phase. The developed PVC membrane showed an approximately six-times higher sensitivity than the conventional membrane, thereby demonstrating highly sensitive ALP detection. These results suggested the potential applicability of the proposed membrane for highly sensitive protein detection by using ALPlabeled antibodies.

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Ionic liquid-based dye: A “Dyed plasticizer” for rapid and highly sensitive anion optodes based on a plasticized PVC membrane

Cited by 19 publications

References 58 publications

Highly sensitive optical ion sensor with ionic liquid-based colorimetric membrane/photonic crystal hybrid structure

Highly sensitive optical ion sensor with ionic liquid-based colorimetric membrane/photonic crystal hybrid structure

Influence of Electrolyte Coextraction on the Response of Indicator-Based Cation-Selective Optodes

Enzyme-responsive Fluorescent Ionic Liquid

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