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Journal articles on the topic 'Le sensor au pH acide'

Author: Grafiati

Published: 4 June 2021

Last updated: 6 February 2022

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1

Ji, Hongli, Junjun Jia, Chao Zhang, Chongcong Tao, Lu Yang, and Jinhao Qiu. "RuO2–IrO2 solid state micro-liquid film pH sensor based on polymeric precursor method." International Journal of Applied Electromagnetics and Mechanics 64, no. 1-4 (2020): 1047–55. http://dx.doi.org/10.3233/jae-209420.

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The glass-type electrodes based pH sensors suffer from the weakness of fragility and poor stability in acid/alkali solution. To overcome these disadvantages, a novel solid-state pH sensor based on a RuO2–IrO2 H+ sensitive electrode via a polymeric precursor method was developed in this paper. The electrochemical performance of pH sensor was tested in different conditions. The experimental results showed that the sensitivity of the pH sensor could reach a high level of 52.0 mV/pH in a wide pH range of 2 ∼ 10. Furthermore, the response of pH sensor was fast and the response time remained less th

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Quinn, Alexander, Yil-Hwan You, and Michael J. McShane. "Hydrogel Microdomain Encapsulation of Stable Functionalized Silver Nanoparticles for SERS pH and Urea Sensing." Sensors 19, no. 16 (2019): 3521. http://dx.doi.org/10.3390/s19163521.

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Conceptual and commercial examples of implantable sensors have been limited to a relatively small number of target analytes, with a strong focus on glucose monitoring. Recently, surface-enhanced Raman spectroscopy (SERS) pH sensors were demonstrated to track acid-producing enzymatic reactions targeting specific analytes. We show here that SERS pH tracking in the basic regime is also possible, and can be used to monitor urea concentration. To accomplish this, we developed a hydrogel consisting of polyelectrolyte multilayer microcapsules containing a SERS-sensitive pH reporter (4-mercapopyridine

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3

Chiang, Chia Chin, Cheung Hwa Hsu, and Chao Hui Ou. "pH Value Detection with CLPFG Sensor." Applied Mechanics and Materials 284-287 (January 2013): 2157–61. http://dx.doi.org/10.4028/www.scientific.net/amm.284-287.2157.

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Detection of pH value plays an important role in many fields; the precise measurement of pH value is very useful in Living systems, Chemistry and Biochemistry. The purpose of this paper is to measure pH value in solution by using Corrugated Long Period Fiber Grating (CLPFG). The CLPFG element is highly sensitive to refractive index changes, and with appropriate design geometry; a variety of target molecules can then be detected. Optical fiber Corrugated Long Period Gratings are designed to act as spectral loss elements that couple with a discrete wavelength out of the optical fiber as a functi

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4

González, Wendy, Janin Riedelsberger, Samuel E. Morales-Navarro, et al. "The pH sensor of the plant K+-uptake channel KAT1 is built from a sensory cloud rather than from single key amino acids." Biochemical Journal 442, no. 1 (2012): 57–63. http://dx.doi.org/10.1042/bj20111498.

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The uptake of potassium ions (K+) accompanied by an acidification of the apoplasm is a prerequisite for stomatal opening. The acidification (approximately 2–2.5 pH units) is perceived by voltage-gated inward potassium channels (Kin) that then can open their pores with lower energy cost. The sensory units for extracellular pH in stomatal Kin channels are proposed to be histidines exposed to the apoplasm. However, in the Arabidopsis thaliana stomatal Kin channel KAT1, mutations in the unique histidine exposed to the solvent (His267) do not affect the pH dependency. We demonstrate in the present

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Bortolotti, Ana, Daniela Belén Vazquez, Juan Cruz Almada, et al. "A Transmembrane Histidine Kinase Functions as a pH Sensor." Biomolecules 10, no. 8 (2020): 1183. http://dx.doi.org/10.3390/biom10081183.

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The two-component system DesK-DesR regulates the synthesis of unsaturated fatty acids in the soil bacteria Bacillus subtilis. This system is activated at low temperature and maintains membrane lipid fluidity upon temperature variations. Here, we found that DesK—the transmembrane histidine kinase—also responds to pH and studied the mechanism of pH sensing. We propose that a helix linking the transmembrane region with the cytoplasmic catalytic domain is involved in pH sensing. This helix contains several glutamate, lysine, and arginine residues At neutral pH, the linker forms an alpha helix that

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Appiagyei, Alfred Bekoe, and Jeong In Han. "Potentiometric Performance of a Highly Flexible-Shaped Trifunctional Sensor Based on ZnO/V2O5 Microrods." Sensors 21, no. 7 (2021): 2559. http://dx.doi.org/10.3390/s21072559.

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A trifunctional flexible sensor was fabricated on a polyethylene terephthalate (PET) fiber surface. Synthesized ZnO and ZnO/V2O5 composite were coated on ZnO seed layer sputtered PET fiber. X-ray diffraction (XRD) and photoelectron spectroscopy (XPS) techniques confirmed the exact formation of ZnO and ZnO/V2O5. The fabricated ZnO/V2O5 on ZnO seeds base temperature sensor recorded better electrical properties and reversibility with a maximum temperature coefficient resistance (TCR) of 0.0111 °C−1. A calibration curve (R = 0.9941) within glucose concentration of (10 µM–10 mM) was obtained at +0.

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Zhang, Jianxin, and Lei Zhou. "Preparation and Optimization of Optical pH Sensor Based on Sol-Gel." Sensors 18, no. 10 (2018): 3195. http://dx.doi.org/10.3390/s18103195.

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Making use of the sol-gel technique, an optical pH sensor was prepared, which was made from an organic carrier with four indictors including congo red, bromophenol blue, cresol red, and chlorophenol red, cross-linked by tetraethyl orthosilicate (TEOS) and cellulose acetate. The actual detection range of the optical pH sensor is 2.5–11.0. The optimal ratio of ethyl orthosilicate, absolute ethanol, deionized water, and hydrochloric acid in glue precursor of the sensor-sensitive membrane was explored. The orthogonal experiment was designed to optimize the dosage of cellulose acetate, N,N-dimethyl

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Lin, Feng, Wei Na He, and Xiang Qun Guo. "Fluorescent Carbon Dots (CDs) as a pH Sensor." Advanced Materials Research 415-417 (December 2011): 1319–22. http://dx.doi.org/10.4028/www.scientific.net/amr.415-417.1319.

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The pH-dependent properties of carbon dots (CDs), decorated with surface carboxylic acid functional groups, are described. Absorption, fluorescence emission measurements were used to study the reversible pH-dependent spectral response. The pH-dependent emissions of CDs demonstrate a strong dependence on the excitation wavelengths and make the as-prepared CDs a good ratiometric pH-sensor candidate. This green material CDs-based probe shows promising potential for probing pH in real sample and in vivo intracellular imaging.

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9

Paul Shylendra, Shimrith, Wade Lonsdale, Magdalena Wajrak, Mohammad Nur-E-Alam, and Kamal Alameh. "Titanium Nitride Thin Film Based Low-Redox-Interference Potentiometric pH Sensing Electrodes." Sensors 21, no. 1 (2020): 42. http://dx.doi.org/10.3390/s21010042.

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In this work, a solid-state potentiometric pH sensor is designed by incorporating a thin film of Radio Frequency Magnetron Sputtered (RFMS) Titanium Nitride (TiN) working electrode and a commercial Ag|AgCl|KCl double junction reference electrode. The sensor shows a linear pH slope of −59.1 mV/pH, R2 = 0.9997, a hysteresis as low as 1.2 mV, and drift below 3.9 mV/h. In addition, the redox interference performance of TiN electrodes is compared with that of Iridium Oxide (IrO2) counterparts. Experimental results show −32 mV potential shift (E0 value) in 1 mM ascorbic acid (reducing agent) for TiN

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10

Martins, A. J., M. Benelmekki, V. Teixeira, and P. J. G. Coutinho. "Platinum Nanoparticles as pH Sensor for Intelligent Packaging." Journal of Nano Research 18-19 (July 2012): 97–104. http://dx.doi.org/10.4028/www.scientific.net/jnanor.18-19.97.

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Pt nanoparticles were produced by reverse micelle templating using DTAB. The resulting nanoparticles showed sizes between 250nm and 500nm and formed clusters. Thioglycolic acid (TGA) was covalently attached to the nanoparticle surface as a stabilizer and as. The Pt nanoparticles were dispersed in water and the dependence of its absorvance on the pH of the solution was studied. The spectra showed surface plamon absorption band at 280nm and also red shifted bands that were attributed to clusters of nanoparticles. It was found that the fraction of cluster population depends on the pH of the aqueo

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Lee, Kang-Ho, Dongkyu Lee, Jongsu Yoon, Ohwon Kwon, and Jaejong Lee. "A Sensitive Potentiometric Sensor for Isothermal Amplification-Coupled Detection of Nucleic Acids." Sensors 18, no. 7 (2018): 2277. http://dx.doi.org/10.3390/s18072277.

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A disposable potentiometric sensor was newly developed for the amplification-coupled detection of nucleic acids. The hydrogen-ion is generally released during isothermal amplification of nucleic acids. The surface potential on the oxide-functionalized electrode of the extended gate was directly measured using full electrical circuits with the commercial metal-oxide semiconductor field-effect transistors (MOSFETs) and ring oscillator components, which resulted in cost-effective, portable and scalable real-time nucleic acid analysis. The current-starved ring oscillator changes surface potential

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Nur Laili, Rizki Putri, Farida Arinie Soelistianto Arinie Soelistianto, Nanak Zakaria, and Nurul Hidayati. "Monitoring Kekenyalan Tahu Kedelai dengan Sensor Kapasitif Menggunakan Mikrokontroller Berbasis Android." E-JOINT (Electronica and Electrical Journal Of Innovation Technology) 2, no. 1 (2021): 35–42. http://dx.doi.org/10.35970/e-joint.v2i1.752.

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Tofu has the best quality vegetable protein because it has the most complete amino acid composition and is believed to have high digestibility (85% -98%). According to SNI 01-3142-1998 and SII No. 0270-1990 testing criteria for soy tofu based on smell, taste, color, appearance, or texture. Tofu soybeans are prone to physical or texture damage due to factors such as inappropriate pH levels and insufficient storage which results in damaged tofu. Therefore in this study, it is proposed to determine the elasticity of soy tofu with the parameters tested are the pH level in the manufacture of soy to

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13

Stroffekova, Katarina, Elena Y. Kupert, Danuta H. Malinowska, and John Cuppoletti. "Identification of the pH sensor and activation by chemical modification of the ClC-2G Cl− channel." American Journal of Physiology-Cell Physiology 275, no. 4 (1998): C1113—C1123. http://dx.doi.org/10.1152/ajpcell.1998.275.4.c1113.

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Rabbit and human ClC-2G Cl− channels are voltage sensitive and activated by protein kinase A and low extracellular pH. The objective of the present study was to investigate the mechanism involved in acid activation of the ClC-2G Cl− channel and to determine which amino acid residues play a role in this acid activation. Channel open probability ( P o) at ±80 mV holding potentials increased fourfold in a concentration-dependent manner with extracellular H+concentration (that is, extracellular pH, pH trans ), with an apparent acidic dissociation constant of pH 4.95 ± 0.27. 1-Ethyl-3(3-dimethylami

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14

Hidalgo, Gabriela, Andrew Burns, Erik Herz, et al. "Functional Tomographic Fluorescence Imaging of pH Microenvironments in Microbial Biofilms by Use of Silica Nanoparticle Sensors." Applied and Environmental Microbiology 75, no. 23 (2009): 7426–35. http://dx.doi.org/10.1128/aem.01220-09.

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ABSTRACT Attached bacterial communities can generate three-dimensional (3D) physicochemical gradients that create microenvironments where local conditions are substantially different from those in the surrounding solution. Given their ubiquity in nature and their impacts on issues ranging from water quality to human health, better tools for understanding biofilms and the gradients they create are needed. Here we demonstrate the use of functional tomographic imaging via confocal fluorescence microscopy of ratiometric core-shell silica nanoparticle sensors (C dot sensors) to study the morphology

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15

Khalil, Sabry, Alaa El-Beltagy, and Mohamed El-Sharnouby. "Potent Acrylamide Determination in Food Products Using Ion-Selective Electrode Technique." Membranes 11, no. 8 (2021): 645. http://dx.doi.org/10.3390/membranes11080645.

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A potent selective acrylamide liquid sensor based on the reaction of acrylamide with 2-(5-Bromo-2-pyridylazo)-5-[N-n-Propyl-N-(3-Sulfopropyl) amino] aniline reagent is successfully designed. The characteristics slope (52.33 mV/decade), linearity usable range from 1.0 × 10−7–1.0 × 10−1 molar, limit of detection (1.6 × 10−8) molar, selectivity attitude to several inorganic cations, amino acids and sugars, time of response (8 s), lifetime (four months), pH effect on the electrode potential and the basic validation parameters were studied. The desirable pH applicable range was 3.0–6.5, and the res

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16

Bounegru, Alexandra, and Constantin Apetrei. "Voltammetric Sensors Based on Nanomaterials for Detection of Caffeic Acid in Food Supplements." Chemosensors 8, no. 2 (2020): 41. http://dx.doi.org/10.3390/chemosensors8020041.

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Caffeic acid may be accurately detected in food supplements by using cyclic voltammetry and carbon screen-printed sensors modified with various nanomaterials. Sensor characterization by cyclic voltammetry in reference solutions has shown that carbon nanotubes or carbon nanofibers significantly improve the sensor response in terms of sensitivity and reversibility. Screen-printed sensors were then used in order to study the electrochemical behavior of caffeic acid in aqueous solution at pH 3.6. A redox process was observed in all cases, which corresponds to a reversible redox process involving t

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Rahmah, Fitri, Fitria Hidayanti, and Mutma Innah. "Penerapan Smart Sensor untuk Kendali pH dan Level Larutan Nutrisi pada Sistem Hidroponik Tanaman Pakcoy." Jurnal Teknologi Informasi dan Ilmu Komputer 6, no. 5 (2019): 527. http://dx.doi.org/10.25126/jtiik.2019651738.

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<p>Penerapan <em>smart sensor</em> untuk kendali parameter pH dan level larutan nutrisi pada tanaman hidroponik bertujuan untuk memenuhi nutrisi tanaman secara otomatis dan kontinu. Sistem kendali <em>closed loop </em>dirancang untuk mengkondisikan parameter pH pada rentang nilai 6-7, serta parameter level larutan nutrisi pada rentang nilai 18-20 cm. Ketika nilai pH berada di bawah 6, maka aktuator <em>solenoid valve</em> di larutan basa akan terbuka secara otomatis dan mengalir ke larutan nutrisi. Begitu juga ketika nilai pH berada di atas 7 maka <

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18

Mostafa, Gamal Abdel Hafiz, Mohamed Hefnawy, and Abdulrahman Al-Majed. "Membrane Sensors for the Selective Determination of Donepezil Hydrochloride." Journal of AOAC INTERNATIONAL 93, no. 2 (2010): 549–55. http://dx.doi.org/10.1093/jaoac/93.2.549.

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Abstract The construction and electrochemical response characteristics of polyvinylchloride (PVC) membrane sensors for donepezil HCl (DP) are described. The sensing membranes incorporated ion-association complexes of DP cation and sodium tetraphenyl borate (sensor 1), phosphomolybdic acid (sensor 2), or phosphotungstic acid (sensor 3) as electroactive materials. The sensors displayed a fast, stable, and near-Nernstian response over a relatively wide DP concentration range (1 102 to 1 106 M), with cationic slopes of 53.0, 54.0, and 51.0 mV/ concentration decade over a pH range of 4.0 to 8.0. Th

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19

Chajanovsky, Itamar, Sarah Cohen, Giorgi Shtenberg, and Ran Yosef Suckeveriene. "Development and Characterization of Integrated Nano-Sensors for Organic Residues and pH Field Detection." Sensors 21, no. 17 (2021): 5842. http://dx.doi.org/10.3390/s21175842.

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Meeting global water quality standards is a real challenge to ensure that food crops and livestock are fit for consumption, as well as for human health in general. A major hurdle affecting the detection of pollutants in water reservoirs is the lapse of time between the sampling moment and the availability of the laboratory-based results. Here, we report the preparation, characterization, and performance assessment of an innovative sensor for the rapid detection of organic residue levels and pH in water samples. The sensor is based on carbonaceous nanomaterials (CNMs) coated with an intrinsical

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Muflihah, Yeni Maulidah, Siswoyo Siswoyo, Tanti Haryati, and Kiki Puji Setianingrum. "FLOW INJECTION POTENTIOMETRIC ANALYSIS OF ASPARTIC ACID, GLUTAMIC ACID AND ASCORBIC ACID USING PLATINUM ELECTRODES." Jurnal ILMU DASAR 13, no. 1 (2014): 25. http://dx.doi.org/10.19184/jid.v13i1.886.

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The presence of weak acids in solution can be detected using a potentiometric detector. Platinum was used as a working electrode and Ag/AgCl as a reference electrode. Ascorbic, glutamic and aspartic acid were detected by a platinum electrode in a flow potentiometric system. The influence of pH, flow rate and concentration of phosphate buffers asa a carrier were studied and showed an optimum pH for the detection of ascorbic and glutamic acid at pH 6,5 and pH 7,0 for aspartic acid. Phosphate buffer concentration optimum at 1x10-4M and flow rate of 1,00 mL/min. Linear range for ascorbic and gluta

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Abu-Thabit, Nedal Y. "Near-Infrared pH Sensor Based on a SPEEK–Polyaniline Polyelectrolyte Complex Membrane." Proceedings 3, no. 1 (2018): 11. http://dx.doi.org/10.3390/iocn_2018-1-05493.

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A polyelectrolyte complex (PEC) membrane based on sulfonated poly (ether ether ketone) and polyaniline (SPEEK-PANI) was developed for pH sensing applications. Aniline was polymerized in the presence of the SPEEK membrane by using in situ chemical oxidative polymerization to yield an ionically crosslinked SPEEK-PANI membrane. The fabricated membrane exhibited sensitivity in the physiological pH range of 2–8. The PEC membrane pH sensor showed good absorption properties in the near-infrared region (NIR). The membrane showed fast response during a de-doping process (≈90 s), while longer response t

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Yang, Mei-Xiang, Qing Tang, Mei Yang, et al. "pH-stimulus response dye-cucurbituril sensor for amino acids in aqueous solution." Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 230 (April 2020): 118076. http://dx.doi.org/10.1016/j.saa.2020.118076.

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Antohe, Iulia, Luiza-Izabela Jinga, Vlad-Andrei Antohe, and Gabriel Socol. "Sensitive pH Monitoring Using a Polyaniline-Functionalized Fiber Optic—Surface Plasmon Resonance Detector." Sensors 21, no. 12 (2021): 4218. http://dx.doi.org/10.3390/s21124218.

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In this work, we report results on the fabrication and characterization of a surface plasmon resonance (SPR) pH sensor using platinum (Pt) and polyaniline (PANI) layers successively coated over an unclad core of an optical fiber (FO). The plasmonic thin Pt layer was deposited using a magnetron sputtering technique, while the pH-sensitive PANI layer was synthesized using an electroless polymerization method. Moreover, the formation of PANI film was confirmed by X-ray photoelectron spectroscopy (XPS) technique and its surface morphology was investigated using scanning electron microscopy (SEM).

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Francone, Achille, Timothy Kehoe, Isabel Obieta, et al. "Integrated 3D Hydrogel Waveguide Out-Coupler by Step-and-Repeat Thermal Nanoimprint Lithography: A Promising Sensor Device for Water and pH." Sensors 18, no. 10 (2018): 3240. http://dx.doi.org/10.3390/s18103240.

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Hydrogel materials offer many advantages for chemical and biological sensoring due to their response to a small change in their environment with a related change in volume. Several designs have been outlined in the literature in the specific field of hydrogel-based optical sensors, reporting a large number of steps for their fabrication. In this work we present a three-dimensional, hydrogel-based sensor the structure of which is fabricated in a single step using thermal nanoimprint lithography. The sensor is based on a waveguide with a grating readout section. A specific hydrogel formulation,

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John, Gernot T., Detlef Goelling, Ingo Klimant, Holger Schneider, and Elmar Heinzle. "pH-Sensing 96-well microtitre plates for the characterization of acid production by dairy starter cultures." Journal of Dairy Research 70, no. 3 (2003): 327–33. http://dx.doi.org/10.1017/s0022029903006344.

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A new method for characterization of acid production by dairy starter cultures is presented. Microplates with integrated optical pH sensors are developed. Two fluorophores, a pH-sensitive and a pH-insensitive one are immobilised at the bottom of a polystyrene 96-well microtitre plate. The pH-insensitive fluorophore serves as an internal reference and makes calibration unnecessary. The sensor measures pH accurately in optically well-defined media. Particles and fluorophores contained in the bulk medium disturbed the measurements. Despite these disturbances it was possible to clearly sense diffe

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Suherman, Suherman, Muh Supwatul Hakim, and Agus Kuncaka. "Optical Chemical Sensor Based on 2,2-Furildioxime in Sol-Gel Matrix for Determination of Ni2+ in Water." Processes 9, no. 2 (2021): 280. http://dx.doi.org/10.3390/pr9020280.

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A new optical chemical sensor was fabricated based on incorporation of 2,2-furildioxime as a sensitive reagent into the nanopore of a transparent glasslike material through the sol-gel method which was suitable for determination of Ni2+ ions in aqueous solutions. The prepared sensors were composed of tetraethoxysilane (TEOS), 2,2-furildioxime, methanol, hydrochloric acid and Triton X-100. The sensors were constructed by dip coating onto glass substrates. The optimum response of the sensor toward Ni2+ ions was reached at pH 8.5 and the contact time for the formation of the complex at 10 min. Th

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Masi, Sabrina Di, Antonio Pennetta, and Cosimino Malitesta. "Preliminary Study on Electrochemical Ion Imprinted Polymeric Film in Sensor Development for Cd(II) Ions Determination in Water." Proceedings 60, no. 1 (2020): 39. http://dx.doi.org/10.3390/iecb2020-07037.

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Preliminary results on an electrosynthesized ion imprinted polymeric film (IIP-film) for Cd(II) ions determination in sensor development are here reported. The sensor was prepared by electropolymerization of 4-aminophenylacetic acid (4-APA) monomer in presence of Cd(II) ions, which acts as the template. The screen-printed carbon electrodes (SPCE) were used as transducer during sensor development, whereas the cyclic voltammetry (CV) and differential pulse voltammetry (DPV) were selected as the electrochemical methods for the synthesis and Cd(II) ions sensing, respectively. The incubation of the

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Sato, K., H. Umeno, S. Chitose, and T. Nakashima. "Tetra-probe, 24-hour pH monitoring for laryngopharyngeal reflux: a technique for simultaneous study of hypopharynx, oesophagus and stomach." Journal of Laryngology & Otology 123, S31 (2009): 117–22. http://dx.doi.org/10.1017/s0022215109005222.

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AbstractObjective:This study aimed to introduce the technique of tetra-probe, 24-hour pH monitoring for laryngopharyngeal reflux disease.Methods:Tetra-probe, 24-hour pH monitoring was performed for 30 suspected cases of laryngopharyngeal reflux. The proximal probe was placed in the hypopharynx, just above the upper oesophageal sphincter, the second probe was placed in the middle oesophagus, the third probe was placed a few centimetres above the lower oesophageal sphincter, and the distal probe was placed in the stomach.Results:As the pH at the four sensor sites could be monitored simultaneousl

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Erfkamp, Jan, Margarita Guenther, and Gerald Gerlach. "Enzyme-Functionalized Piezoresistive Hydrogel Biosensors for the Detection of Urea." Sensors 19, no. 13 (2019): 2858. http://dx.doi.org/10.3390/s19132858.

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Urea is used in a wide variety of industrial applications such as the production of fertilizers. Furthermore, urea as a metabolic product is an important indicator in biomedical diagnostics. For these applications, reliable urea sensors are essential. In this work, we present a novel hydrogel-based biosensor for the detection of urea. The hydrolysis of urea by the enzyme urease leads to an alkaline pH change, which is detected with a pH-sensitive poly(acrylic acid-co-dimethylaminoethyl methacrylate) hydrogel. For this purpose, the enzyme is physically entrapped during polymerization. This enzy

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Magina, Sandra, Alisa Rudnitskaya, Sílvia Soreto, Luís Cadillon Costa, Ana Barros-Timmons, and Dmitry V. Evtuguin. "Lignosulfonate-Based Conducting Flexible Polymeric Membranes for Liquid Sensing Applications." Materials 14, no. 18 (2021): 5331. http://dx.doi.org/10.3390/ma14185331.

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In this study, lignosulfonate (LS) from the acid sulfite pulping of eucalypt wood was used to synthesize LS-based polyurethanes (PUs) doped with multiwalled carbon nanotubes (MWCNTs) within the range of 0.1–1.4% w/w, yielding a unique conducting copolymer composite, which was employed as a sensitive material for all-solid-state potentiometric chemical sensors. LS-based PUs doped with 1.0% w/w MWCNTs exhibited relevant electrical conductivity suitable for sensor applications. The LS-based potentiometric sensor displayed a near-Nernstian or super-Nernstian response to a wide range of transition

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Wu, Zhu Lian, Ming Xuan Gao, Ting Ting Wang, Xiao Yan Wan, Lin Ling Zheng, and Cheng Zhi Huang. "A general quantitative pH sensor developed with dicyandiamide N-doped high quantum yield graphene quantum dots." Nanoscale 6, no. 7 (2014): 3868–74. http://dx.doi.org/10.1039/c3nr06353d.

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Using citric acid and dicyandiamide, through a hydrothermal synthesis, we fabricated N-doped graphene quantum dots (GQDs), which possess excellent photoluminescence properties and pH sensitivity and developed a pH sensor for environmental and intracellular application.

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Posson, David J., Ameer N. Thompson, Jason G. McCoy, and Crina M. Nimigean. "Molecular interactions involved in proton-dependent gating in KcsA potassium channels." Journal of General Physiology 142, no. 6 (2013): 613–24. http://dx.doi.org/10.1085/jgp.201311057.

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The bacterial potassium channel KcsA is gated open by the binding of protons to amino acids on the intracellular side of the channel. We have identified, via channel mutagenesis and x-ray crystallography, two pH-sensing amino acids and a set of nearby residues involved in molecular interactions that influence gating. We found that the minimal mutation of one histidine (H25) and one glutamate (E118) near the cytoplasmic gate completely abolished pH-dependent gating. Mutation of nearby residues either alone or in pairs altered the channel’s response to pH. In addition, mutations of certain pairs

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Georgescu, Ramona, Jacobus Frederick van Staden, Raluca-Ioana Stefan-van Staden, and Cristian Boscornea. "Evaluation of amperometric dot microsensors for the analysis of folic acid in pharmaceutical tablets and urine samples." Journal of Porphyrins and Phthalocyanines 19, no. 05 (2015): 679–87. http://dx.doi.org/10.1142/s1088424615500066.

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Nineteen amperometric dot microsensors based on graphite and graphene modified with a selection of porphyrins and phthalocyanines were evaluated and tested for their ability of the analysis of folic acid in pharmaceutical tablets (e.g. Acifol) and biological samples (e.g. urine), using differential pulse voltammetry. Cyclic voltammetry was used to optimize the working conditions, e.g. pH and electrolyte for the proposed amperometric dot microsensors. The optimum working pH was 7.0 (phosphate buffer), with a 0.1 M potassium chloride supporting electrolyte. The linear concentration ranges for fo

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Harvyandha, Avryan. "Telemetry Measurement of Acidity in Real Time Using the Raspberry Pi." Jurnal Jartel: Jurnal Jaringan Telekomunikasi 9, no. 4 (2019): 55–60. http://dx.doi.org/10.33795/jartel.v9i4.158.

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PH is the standard value of degree of acidity expressed on a scale 0-14. PH can be influenced by several factors such as temperature and CO2. Acidification occurs because CO2 enters the liquid in the form of dissolved gas then reacts with water to form a salt in the form of carbonic acid. The acidity can be determined by measuring the pH. PH measurement is an activity to determine the value of degree of acidity. PH measurement is needed to reduce the impact on the environment because pH is closely related to pollution. However, the existing measurement tools are still manual, while real time m

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Sánchez-Arreguin, José Alejandro, José Ruiz-Herrera, F. de Jesus Mares-Rodriguez, et al. "Acid pH Strategy Adaptation through NRG1 in Ustilago maydis." Journal of Fungi 7, no. 2 (2021): 91. http://dx.doi.org/10.3390/jof7020091.

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The role of the Ustilago maydis putative homolog of the transcriptional repressor ScNRG1, previously described in Saccharomyces cerevisiae, Candida albicans and Cryptococcus neoformans, was analyzed by means of its mutation. In S. cerevisiae this gene regulates a set of stress-responsive genes, and in C. neoformans it is involved in pathogenesis. It was observed that the U. maydisNRG1 gene regulates several aspects of the cell response to acid pH, such as the production of mannosyl-erythritol lipids, inhibition of the expression of the siderophore cluster genes, filamentous growth, virulence a

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Stojkoski, Viktor, and Mateja Kert. "Design of pH Responsive Textile as a Sensor Material for Acid Rain." Polymers 12, no. 10 (2020): 2251. http://dx.doi.org/10.3390/polym12102251.

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The chemical composition of rainwater can serve as an indicator of the excess of acidifying air pollutants. The pH value of rainwater in the presence of sulphur dioxide and nitrogen oxides, the precursors of acid rain, falls below pH 5.6, which is the limit value for acid rain. In this research, the tailoring of halochromic textile was examined for the design of a functional textile that can serve as a sensor and inform the wearer about the presence of pollutants in the air by means of an immediate colour change. For this purpose, a polyamide 6 fabric was dyed with the pH-sensitive Bromocresol

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Atkinson, Kimberly F., Rinzhin T. Sherpa, and Surya M. Nauli. "The Role of the Primary Cilium in Sensing Extracellular pH." Cells 8, no. 7 (2019): 704. http://dx.doi.org/10.3390/cells8070704.

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Biosensors on the membrane of the vascular endothelium are responsible for sensing mechanical and chemical signals in the blood. Transduction of these stimuli into intracellular signaling cascades regulate cellular processes including ion transport, gene expression, cell proliferation, and/or cell death. The primary cilium is a well-known biosensor of shear stress but its role in sensing extracellular pH change has never been examined. As a cellular extension into the immediate microenvironment, the cilium could be a prospective sensor for changes in pH and regulator of acid response in cells.

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Plocek, Anna, Beata Gębora-Kowalska, Jakub Białek, Wojciech Fendler, and Ewa Toporowska-Kowalska. "Esophageal Impedance-pH Monitoring and Pharyngeal pH Monitoring in the Diagnosis of Extraesophageal Reflux in Children." Gastroenterology Research and Practice 2019 (March 3, 2019): 1–8. http://dx.doi.org/10.1155/2019/6271910.

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Various clinical symptoms are attributed to extraesophageal reflux disease (EERD). Multichannel intraluminal impedance-pH monitoring (MII-pH) is considered to correlate symptoms with acid and nonacid gastroesophageal reflux (GER) events. Pharyngeal pH monitoring (Dx-pH) is considered to correlate the decrease in the pH level in the oropharynx with reported symptoms and to diagnose supraesophageal reflux. We aimed to assess the correlation between acid reflux episodes recorded by Dx-pH and GER detected via MII-pH in children with suspected EERD. The study enrolled 23 consecutive children (15 bo

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Ichikawa, Mariko, Masaaki Minami, Masanori Isaka, Ichiro Tatsuno, and Tadao Hasegawa. "Analysis of two-component sensor proteins involved in the response to acid stimuli in Streptococcus pyogenes." Microbiology 157, no. 11 (2011): 3187–94. http://dx.doi.org/10.1099/mic.0.050534-0.

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The virulence of Streptococcus pyogenes depends on proteins that are produced by this bacterium. The production of virulence proteins depends on environmental factors, and two-component regulatory systems are considered to be involved in sensing these factors. One of the environmental factors is acid stimuli. We established knockout strains in all speculated two-component regulatory sensor proteins of the M1 clinical strain of S. pyogenes and examined their relevance to acid stimuli. The parental strain and its derived knockout strains were cultured in a medium adjusted to pH 7.6 or 6.0, and t

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Weusten, B. L., L. M. Akkermans, G. P. vanBerge-Henegouwen, and A. J. Smout. "Spatiotemporal characteristics of physiological gastroesophageal reflux." American Journal of Physiology-Gastrointestinal and Liver Physiology 266, no. 3 (1994): G357—G362. http://dx.doi.org/10.1152/ajpgi.1994.266.3.g357.

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Recent technological developments have made it possible to measure intraluminal pH simultaneously at multiple sites using one single small-caliber catheter. The aim of this study was to investigate the dynamics of physiological gastroesophageal reflux in eight ambulatory healthy volunteers (age 21-51 yr). Esophageal pH was recorded for 24 h at 3, 6, 9, 12 and 15 cm from the lower esophageal sphincter (LES), using an 8-Fr catheter containing five ion-sensitive field effect transistor (ISFET) pH transducers and a digital data logger. Signals were sampled at a rate of 4 Hz. Automated analysis inc

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Vretzakis, Papadimitriou, Stylianos Koutsias, et al. "Kontinuierliches kontralaterales Säure-, Basen- und Blutgas Monitoring während Karotis-Endarterektomie." Vasa 29, no. 3 (2000): 221–24. http://dx.doi.org/10.1024/0301-1526.29.3.221.

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Background: The aim of this study is to evaluate the intravascular multiparameter sensor Paratrend 7 (P7) for continuous acid-base and blood gas monitoring after retrograde jugular catheterization during carotid endarterectomy. Patients and methods: We studied 11 patients with history of smoking (72.7%), coronary artery disease (72.7%), hypertension (100%), diabetes mellitus (55.5%) and TIA’s and/or nondisabling stroke (90.9%). The contralateral internal jugular vein was punctured retrogradely and the calibrated P7 sensor was introduced. The sensor was removed after surgery. The P7 provides co

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Hosu, Oana, Madalina M. Barsan, Robert Săndulescu, Cecilia Cristea, and Christopher M. A. Brett. "Hybrid Nanocomposite Platform, Based on Carbon Nanotubes and Poly(Methylene Blue) Redox Polymer Synthesized in Ethaline Deep Eutectic Solvent for Electrochemical Determination of 5-Aminosalicylic Acid." Sensors 21, no. 4 (2021): 1161. http://dx.doi.org/10.3390/s21041161.

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A novel hybrid composite of conductive poly(methylene blue) (PMB) and carbon nanotubes (CNT) was prepared for the detection of 5-aminosalicylic acid (5-ASA). Electrosynthesis of PMB with glassy carbon electrode (GCE) or with carbon nanotube modified GCE was done in ethaline deep eutectic solvent of choline chloride mixed with ethylene glycol and a 10% v/v aqueous solution. Different sensor architectures were evaluated in a broad range of pH values in a Britton-Robinson (BR) buffer using electrochemical techniques, chronoamperometry (CA), and differential pulse voltammetry (DPV), to determine t

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Wang, Tong, Xuan Zhang, Zichao Wang, et al. "Smart Composite Hydrogels with pH-Responsiveness and Electrical Conductivity for Flexible Sensors and Logic Gates." Polymers 11, no. 10 (2019): 1564. http://dx.doi.org/10.3390/polym11101564.

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Stimuli-responsive conductive hydrogels have a wide range of applications due to their intelligent sensing of external environmental changes, which are important for smart switches, soft robotics, and flexible sensors. However, designing stimuli-responsive conductive hydrogels with logical operation, such as smart switches, remains a challenge. In this study, we synthesized pH-responsive conductive hydrogels, based on the copolymer network of acrylic acid and hydroxyethyl acrylate doped with graphene oxide. Using the good flexibility and conductivity of these hydrogels, we prepared a flexible

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Erdogdu, Gamze. "Electrochemical Sensor for Acetaminophen Based on a Poly(diphenylamine sulfonic acid) Modified Sensor." Sensor Letters 18, no. 10 (2020): 739–44. http://dx.doi.org/10.1166/sl.2020.4285.

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A sensitive and simple modified sensor was prepared by electrodeposition of diphenylamine sulfonic acid (DPSA) to the glassy carbon electrode surface by cyclic voltammetry (CV) technique. The electrooxidation of Acetaminophen (AC) was accomplished by CV and differential pulse voltammetry at poly(DPSA) modified sensor. As a result of the findings, the current values were enhanced and both substances were separated at the modified sensor compared to the bare electrode. There was linearly between the oxidation current and concentration of AC from 0.0 to 100 μM in phospate buffer solution at pH 7.

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Journal, Baghdad Science. "Mefenamic Acid Selective Membranes Sensor and Its Application to pharmaceutical Analysis." Baghdad Science Journal 13, no. 4 (2016): 829–37. http://dx.doi.org/10.21123/bsj.13.4.829-837.

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PVC membrane sensor for the selective determination of Mefenamic acid (MFA) was constructed. The sensor is based on ion association of MFA with Dodecaphospho molybdic acid (PMA) and Dodeca–Tungstophosphoric acid(PTA) as ion pairs. Nitro benzene (NB) and di-butyl phthalate (DBPH) were used as plasticizing agents in PVC matrix membranes. The specification of sensor based on PMA showed a linear response of a concentration range 1.0 × 10–2 –1.0 × 10–5 M, Nernstian slopes of 17.1-18.86 mV/ decade, detection limit of 7 × 10-5 -9.5 × 10 -7M, pH range 3 – 8 , with correlation coefficients lying betwee

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Gühlke, Marina, Zsuzsanna Heiner, and Janina Kneipp. "Combined near-infrared excited SEHRS and SERS spectra of pH sensors using silver nanostructures." Physical Chemistry Chemical Physics 17, no. 39 (2015): 26093–100. http://dx.doi.org/10.1039/c5cp03844h.

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Combined surface-enhanced Raman scattering (SERS) and surface-enhanced hyper-Raman scattering (SEHRS) of a pH sensor, consisting of silver nanostructures and para-mercaptobenzoic acid and operating with near-IR excitation, is studied.

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Park, Young Ki, Byeong M. Oh, A. Ra Jo, et al. "Fabrication of Colorimetric Textile Sensor Based on Rhodamine Dye for Acidic Gas Detection." Polymers 12, no. 2 (2020): 431. http://dx.doi.org/10.3390/polym12020431.

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For the immediate detection of gaseous strong acids, it is advantageous to employ colorimetric textile sensors based on halochromic dyes. Thus, a rhodamine dye with superior pH sensitivity and high thermal stability was synthesized and incorporated in nylon 6 and polyester fabrics to fabricate textile sensors through dyeing and printing methods. The spectral properties and solubility of the dye were examined; sensitivity to acidic gas as well as durability and reversibility of the fabricated textile sensors were investigated. Both dyed and printed sensors exhibited a high reaction rate and dis

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Hassan, Saad S. M., Ayman H. Kamel, Abd El-Galil E. Amr, Heba M. Hashem, and E. M. Abdel Bary. "Imprinted Polymeric Beads-Based Screen-Printed Potentiometric Platforms Modified with Multi-Walled Carbon Nanotubes (MWCNTs) for Selective Recognition of Fluoxetine." Nanomaterials 10, no. 3 (2020): 572. http://dx.doi.org/10.3390/nano10030572.

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Herein, we present a new validated potentiometric method for fluoxetine (FLX) drug monitoring. The method is based on the integration of molecular imprinting polymer (MIP) beads as sensory elements with modified screen-printed solid contact ion-selective electrodes (ISEs). A multi-walled carbon nanotube (MWCNT) was used as a nanomaterial for the ion-to-electron transduction process. The prepared MIP beads depend on the use of acrylamide (AAm) and ethylene glycol dimethacrylic acid (EGDMA) as a functional monomer and cross-linker, respectively. The sensor revealed a stable response with a Nerns

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Md Zain, Badrul Aisham, Muhammad Farhan Khasim, Salihatun Md Salleh, and Md Saidin Wahab. "Design Concept of Two Tank Reservoirs to Maintain pH Value for Tiger Prawn." Applied Mechanics and Materials 660 (October 2014): 851–56. http://dx.doi.org/10.4028/www.scientific.net/amm.660.851.

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Shrimp culture is the fastest growing sector of the aquaculture industry in Malaysia. In culturing tiger prawn, the pH level needed for water is around 7.0-8.5. Currently, prawn farmer in Malaysia still using a manual method to control the water pH level by adding chemical (Lime), in which, the process required constant monitoring and control by labor. Since the prawns are so sensitive on pH level, an automatic pH control system is required to maintain the water pH automatically and precisely. This research was conducted to design a system that can control and provide feedback on the changes o

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Yu, Kun, Limin Ren, Yisong Tan, and Junyao Wang. "Wireless Magnetoelasticity-Based Sensor for Monitoring the Degradation Behavior of Polylactic Acid Artificial Bone In Vitro." Applied Sciences 9, no. 4 (2019): 739. http://dx.doi.org/10.3390/app9040739.

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A magnetoelasticity-based (MB) sensor was employed for monitoring the degradation behavior of polylactic acid (PLA) artificial bone (PAB) in vitro, which can be used as an implant to repair bone defects. Biodegradable PLA material was coated on both sides of the MB sensor strip with a 3D printer, forming PAB. The PAB samples were submerged in an alkaline medium (pH = 12) and a neutral phosphate-buffered saline (PBS) medium (pH = 7.4). The degradation behavior of the PAB was monitored wirelessly based on changes in the output power of the MB sensor. The results indicated that the output power v

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