Optical fibre biosensors based on immobilised enzymes

Kuswandi, Bambang; Andres, Roberto T.; Narayanaswamy, Ramaier

doi:10.1039/b008311i

Cited by 93 publications

(48 citation statements)

References 127 publications

(213 reference statements)

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“…46 The required selectivity values for the worst case (i.e., lowest concentration of fluoride and highest concentration of interferent ion), , were determined according to the eq. (3), (3) where, a j, high is the maximum concomitant level (MCL) of the interfering species as set by the U.S. Environmental Protection Agency (U.S. EPA), 47 a i, low is the lowest level of fluoride in municipal drinking water as set by EPA, 47 p ij is the maximal tolerated error (%) caused by the interferent ion j z j (this was set to 1 %), and z i , z j are the charges of i and j, respectively.…”

Section: Optical Fluoride Selectivitymentioning

confidence: 99%

“…Ionophore selective extraction of the target ion from the sample causes a concomitant coextraction or liberation of protons from/by the pH indicator to maintain charge neutrality within the organic film, yielding a change in the optical properties (e.g., absorption spectrum) of the films. 13 The development of fluoride selective optical sensors is of potential practical importance and would offer an attractive low-cost/disposable alternative to the widely used solid-state LaF 3 ion-selective electrode, especially for mass production (e.g., via screen printing) of planar sensor arrays and single-use devices. Highly selective fluoride sensors are useful for the determination of fluoride levels in municipal/potable water and for monitoring organofluorophosphates, especially those belonging to a class of highly toxic neurotoxins that are commonly used as chemical warfare agents (e.g., Sarin and Soman).…”

Section: Introductionmentioning

confidence: 99%

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Fluoride-Selective Optical Sensor Based on Aluminum(III)−Octaethylporphyrin in Thin Polymeric Film: Further Characterization and Practical Application

Badr

Meyerhoff

2005

Anal. Chem.

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More detailed analytical studies of a new fluoride selective optical sensor based on the use of aluminum(III)-octaethylporphyrin and a lipophilic pH indicator (4′,5′-dibromofluorescein octadecyl ester; ETH-7075) within a thin plasticized poly(vinyl chloride) film are reported. The sensor exhibits extraordinary optical selectivity for fluoride over a wide range of other anions, including anions with far more positive free energies of hydration (e.g., perchlorate, thiocyanate, nitrate, etc.). UV-VIS spectrophotometric studies of the sensing films indicate that fluoride interacts with the Al(III) center of the porphyrin structure, yielding both a change in the Soret band λ max of the porphyrin as well as a change in the protonation state of the pH indicator within the film. The same change in spectral properties of the metalloporphyrin occurs in the absence of added pH indicator or with added tetraphenylborate derivative anionic sites, but optical responses to fluoride in these cases are shown to be irreversible. The presence of the pH indicator and the simultaneous fluoride/proton coextraction equilibrium chemistry is shown to greatly enhance the reversibility of fluoride binding to the Al(III) porphyrin. Optical response toward fluoride can be observed in the range of 0.1 μM to 1.6 mM. Optical selectivity coefficients of < 10 −6 for common anions (e.g., sulfate, chloride, nitrate etc.) and < 10 −4 for perchlorate and thiocyanate are obtained. Measurements of fluoride in drinking water via the new optical sensor are shown to correlate well with values obtained for the same samples using a classical LaF 3 based fluoride ion-selective electrode method.

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Section: Optical Fluoride Selectivitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fluoride-Selective Optical Sensor Based on Aluminum(III)−Octaethylporphyrin in Thin Polymeric Film: Further Characterization and Practical Application

Badr

Meyerhoff

2005

Anal. Chem.

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“…The absorbance of biosensor also impacted by the unit of the enzyme, Fig. 1c shows that 1 unit is the optimum amount for the study as AOX played role on splitting the bond of formaldehyde into aldehyde (HCOO -) and H + ion [4]. As reported by Chen and Chaix [5,6], succinimide functional group contained in NAS react with amine groups on AOX via covalent bonding.…”

Section: Optimization Of Biosensormentioning

confidence: 85%

Fabrication and optimisation of optical biosensor using alcohol oxidase enzyme to evaluate detection of formaldehyde

Rachim¹,

Sari²,

Nurlely³

et al. 2017

AIP Conference Proceedings

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“…The most commonly applied biomolecules are enzymes, antibodies, and receptors [162]. Current research includes combinatorial screening or design of the amino acid sequence of the binding region of antibody.…”

Section: Bioengineeringmentioning

confidence: 99%

Biosensors for environmental applications: Future development trends

Rodríguez-Mozaz

Marco

Alda

et al. 2004

Pure and Applied Chemistry

199

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Biosensors can be excellent analytical tools for monitoring programs working to implement legislation. In this article, biosensors for environmental analysis and monitoring are extensively reviewed. Examples of biosensors for the most important families of environmental pollutants, including some commercial devices, are presented. Finally, future trends in biosensor development are discussed. In this context, bioelectronics, nanotechnology, miniaturization, and especially biotechnology seem to be growing areas that will have a marked influence on the development of new biosensing strategies in the next future.

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Optical fibre biosensors based on immobilised enzymes

Cited by 93 publications

References 127 publications

Fluoride-Selective Optical Sensor Based on Aluminum(III)−Octaethylporphyrin in Thin Polymeric Film: Further Characterization and Practical Application

Fluoride-Selective Optical Sensor Based on Aluminum(III)−Octaethylporphyrin in Thin Polymeric Film: Further Characterization and Practical Application

Fabrication and optimisation of optical biosensor using alcohol oxidase enzyme to evaluate detection of formaldehyde

Biosensors for environmental applications: Future development trends

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