Optical pH sensor based on spectral response of newly synthesized Schiff bases

Hazneci, Cemal; Ertekin, Kadriye; Yenigül, Berrin; Çetinkaya, Engin

doi:10.1016/j.dyepig.2003.11.006

Cited by 32 publications

(18 citation statements)

References 25 publications

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“…The results showed that the change in the ionic strength could affect the pK a value of the dye. As previously reported with increasing ionic strength, the acidity of the optode decreases [8,13,19].…”

Section: Effect Of Ionic Strengthsupporting

confidence: 84%

“…Azo derivatives of aromatic amines which can be considered as weak bases normally show blue shifts upon protonation and a decrease in the corresponding optical densities. However, azo derivatives of hydroxy aromatic compounds, display red shifts after dissociation at higher pH(s) without losing their corresponding optical intensities [8]. Therefore, spectrochemical properties of six derivatives of two different hydroxyazobenzene systems were investigated in this study.…”

Section: Spectrophotometric Study Of Hydroxyazobenzene Derivativesmentioning

confidence: 99%

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Development of optical pH sensors based on derivatives of hydroxyazobenzene, and the extended linear dynamic range using mixture of dyes

2008

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Section: Effect Of Ionic Strengthsupporting

confidence: 84%

Section: Spectrophotometric Study Of Hydroxyazobenzene Derivativesmentioning

confidence: 99%

Development of optical pH sensors based on derivatives of hydroxyazobenzene, and the extended linear dynamic range using mixture of dyes

2008

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“…Hazneci et al investigated Schiff bases for absorptiometric and fluorometric sensing in the pH 3–7.8 range. 365 The Schiff bases, derived from p -dimethylaminobenzaldehyde or 2,6-diacetylpyridine, were placed in thin films of plasticized PVC on a polyester support. The display yellow color (absorption peaks near 350 and 415 nm) and the 2,6-diacetylpyridine-derived films also display blue-green fluorescence.…”

Section: Overview Of Commonly Used Absorptiometric Ph Probesmentioning

confidence: 99%

Optical Sensing and Imaging of pH Values: Spectroscopies, Materials, and Applications

2020

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This is the first comprehensive review on methods and materials for use in optical sensing of pH values and on applications of such sensors. The Review starts with an introduction that contains subsections on the definition of the pH value, a brief look back on optical methods for sensing of pH, on the effects of ionic strength on pH values and p K a values, on the selectivity, sensitivity, precision, dynamic ranges, and temperature dependence of such sensors. Commonly used optical sensing schemes are covered in a next main chapter, with subsections on methods based on absorptiometry, reflectometry, luminescence, refractive index, surface plasmon resonance, photonic crystals, turbidity, mechanical displacement, interferometry, and solvatochromism. This is followed by sections on absorptiometric and luminescent molecular probes for use pH in sensors. Further large sections cover polymeric hosts and supports, and methods for immobilization of indicator dyes. Further and more specific sections summarize the state of the art in materials with dual functionality (indicator and host), nanomaterials, sensors based on upconversion and 2-photon absorption, multiparameter sensors, imaging, and sensors for extreme pH values. A chapter on the many sensing formats has subsections on planar, fiber optic, evanescent wave, refractive index, surface plasmon resonance and holography based sensor designs, and on distributed sensing. Another section summarizes selected applications in areas, such as medicine, biology, oceanography, bioprocess monitoring, corrosion studies, on the use of pH sensors as transducers in biosensors and chemical sensors, and their integration into flow-injection analyzers, microfluidic devices, and lab-on-a-chip systems. An extra section is devoted to current challenges, with subsections on challenges of general nature and those of specific nature. A concluding section gives an outlook on potential future trends and perspectives.

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“…Optrodes have several advantages over conventional potentiometric-or voltametricbased electronic sensors including ability to measure pH remotely in electrically noisy environments, small size of the fiber tip/sensing region, flexibility, absence of reference electrode, and suitability for on-line monitoring in biotechnological processes (for review see [23]). Recent developments in absorption optrodes utilize newly synthesized chemical probes and/or immobilizing materials, optimizing chemical stability [24], range of pH sensitivity [21,25], and spectral range of optical detection [26].…”

Section: Absorption Ph Spectroscopymentioning

confidence: 99%

Biological Imaging and Spectroscopy of pH

Khramtsov¹

2005

COC

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The critical role of pH status in physiology and pathophysiology of living organisms is well recognized. This includes local acidosis induced by ischemia, infection or inflammation, extracellular acidosis in tumors, depth-specific tissue pH variations during skin treatments or wound healing, etc. At the microscopic scale local pH drastically affects the vital activities of cell, cellular organelles and enzymes. Upon therapeutic intervention, the delivery, absorption and pharmacological effectiveness of drugs can be altered by changing the pH of their local environment. Therefore, spatially and temporarily addressed pH measurements in vivo are of considerable clinical relevance. At subcellular levels, spatiotemporal pH assessment provides significant insight into the mechanisms of pH regulation in cellular organelles and its role in cellular signaling including cell proliferation and apoptosis.Current methods in biological pH detection and imaging, their limits, advantages and recent applications, as well as further perspectives of their development are discussed. Non-invasive spectroscopic approaches mostly rely on endogenous or/and exogenous molecular probes that are weak acids or bases with pH-dependable spectral properties. Absorption and fluorescent probes may be considered particularly effective for pH studies on cellular and subcellular levels, while magnetic resonance approaches based on EPR and NMR spectroscopies have the advantage for in vivo applications in animals and humans. Special emphasis is given to EPR spectroscopy due to the rapid development of lowfield EPR techniques and new pH sensitive probes with enhanced spectral properties making in vivo pH detection and imaging possible.

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Optical pH sensor based on spectral response of newly synthesized Schiff bases

Cited by 32 publications

References 25 publications

Development of optical pH sensors based on derivatives of hydroxyazobenzene, and the extended linear dynamic range using mixture of dyes

Development of optical pH sensors based on derivatives of hydroxyazobenzene, and the extended linear dynamic range using mixture of dyes

Optical Sensing and Imaging of pH Values: Spectroscopies, Materials, and Applications

Biological Imaging and Spectroscopy of pH

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