Fluorescent Chemosensors for Cations, Anions, and Neutral Analytes

Czarnik, Anthony W.

doi:10.1007/0-306-47060-8_3

Cited by 10 publications

(9 citation statements)

References 22 publications

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“…The only requirement is a fluorophore that changes intensity in response to the analyte. Such fluorescent probes are known for a wide variety of species, including sodium, potassium, calcium, magnesium, zinc, chloride, phosphate, and oxygen. − Hence, visual sensors can be anticipated for a wide range of analytes.…”

Section: Resultsmentioning

confidence: 99%

Polarization Sensing with Visual Detection

Gryczyński

Lakowicz

1999

Anal. Chem.

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We describe a new approach to fluorescence sensing which relies on visual determination the polarization. The sensing device consists of a fluorescent probe, which changes intensity in responses to the analyte, and an oriented fluorescent film, which is not affected by the analyte. An emission filter is selected to observe the emission from both the film and the sensing fluorophore. Changes in the probe intensity result in changes in the polarization of the combined emission from the sensor and reference. The degree of polarization can be detected visually using a dual polarizer with adjacent sections oriented orthogonally to each other. The emission passing through the dual polarizer is viewed with a second analyzing polarizer. This analyzer is rotated manually to yield equal intensities from both sides of the dual polarizer. This approach was used to measure the concentration of RhB in intralipid and to measure pH using 6-carboxyfluorescein. The analyzer angle is typically accurate to 1 degree, providing pH values accurate to +/- 0.1 pH unit at the midpoint of the titration curve. We also describe a method of visual polarization sensing that does not require an oriented film and that can use the same fluorophore for the sample and reference. These approaches to visual sensing are generic and can be applied to a wide variety of analytes for which fluorescent probes are available. Importantly, the devices are simple, with the only electronic component being the light source.

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Section: Resultsmentioning

confidence: 99%

Polarization Sensing with Visual Detection

Gryczyński

Lakowicz

1999

Anal. Chem.

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“…About six series of hyperbranched polymers with various architectures and end groups were designed, synthesized and characterized. 26,80,[86][87][88][89][90][91][92][93][94][95][96][97][98][99]112 For comparison, corresponding linear polymers were also synthesized. The properties of the former were observed to be definitely better as compared to the latter.…”

Section: Asit Baran Samuimentioning

confidence: 99%

“…The BBCA, being an optically active group, is expected to be used in optical applications. This type of polymer was established to be utilized in the field of fluorescent sensors, [90][91][92][93] photo-resist technology (optical and microlithography), 3,4,16,17,[33][34][35]94 optical data recording, 95,96,88 and UV shield materials. 24,25 The bisbenzylidene moiety was reported to be used in general medical therapy and chemotherapy and as a protecting group in organic synthesis.…”

Section: Asit Baran Samuimentioning

confidence: 99%

“…Fluorescent sensors are finding use as probes in biological, ecological and medical investigations. 90,91 Moreover, designing materials to sense particular metal ions has excellent utility. Recently, Doroshenko et al investigated the utilization of a bisazacrown derivative of bisbenzylidene cyclopentanone as a chelating probe for Mg 2+ and Ba 2+ metal ions.…”

Section: Fluorescent Sensor Applicationsmentioning

confidence: 99%

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Bisbenzylidene cycloalkanone: a versatile molecule as a polymer building block

Murali

Samui

2010

J. Mater. Chem.

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Bisbenzylidene cycloalkanone [BBCA], a versatile photo-active molecule, has already shown its potential for applications in biology, chemistry, materials science and technology. The molecule possesses the dual nature of a photo-active molecule and a mesogenic unit. It was studied as such for medical applications and by incorporating it into polymer architectures for harnessing its properties as a photo-active as well as a mesogenic unit. It was incorporated into almost all kinds of polymer architectures from polyester to polyimide. The special features of the polymer bearing this unit are high thermal stability, photo-curing ability (for adhesives, photo-resists, holography), electronic conductivity, fluorescence, etc. Even during the past decades progress was made mostly in the methods of synthesis and structural understanding of these polymers, the functional understanding and application of these polymers are still in their infancy. Quite recently, bisbenzylidene cycloalkanone polymers (linear and hyperbranched) have been reported by our group. The hyperbranched polymers address some problems regarding the solubility and quick photo-response of bisbenzylidene polymers. We discuss the state-of-the-art of this multi-disciplinary BBCA molecule and BBCA containing polymers reported to date. We believe this article will be very useful as the progress in science and technology concerning this molecule is rather slow. Our aim is to bring together details of the work reported so-far and its significance that will be useful to the scientific community.

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“…Selective chemosensors for anions have been actively pursued for biological and environmental monitoring, food quality assurance, and other practical applications [1][2][3][4][5][6][7][8][9][10][11]. Fluoride (F − ) is a particularly important analyte due to its biological activity, exemplified by its widespread use as a drinking water additive for the prevention of tooth decay.…”

Section: Introductionmentioning

confidence: 99%