potentiometric measurement
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Author(s):  
Sang Cheol Kim ◽  
Xian Kong ◽  
Rafael A. Vilá ◽  
William Huang ◽  
Yuelang Chen ◽  
...  


Author(s):  
Li Zhang ◽  
Tianci Xu ◽  
Wenliang Ji ◽  
Xiaofang Wang ◽  
Shuwen Cheng ◽  
...  


Sensors ◽  
2020 ◽  
Vol 20 (12) ◽  
pp. 3455 ◽  
Author(s):  
Jumpei Yoshimatsu ◽  
Kiyoshi Toko ◽  
Yusuke Tahara ◽  
Misaki Ishida ◽  
Masaaki Habara ◽  
...  

A taste sensor with lipid/polymer membranes is one of the devices that can evaluate taste objectively. However, the conventional taste sensor cannot measure non-charged bitter substances, such as caffeine contained in coffee, because the taste sensor uses the potentiometric measurement based mainly on change in surface electric charge density of the membrane. In this study, we aimed at the detection of typical non-charged bitter substances such as caffeine, theophylline and theobromine included in beverages and pharmaceutical products. The developed sensor is designed to detect the change in the membrane potential by using a kind of allosteric mechanism of breaking an intramolecular hydrogen bond between the carboxy group and hydroxy group of aromatic carboxylic acid (i.e., hydroxy-, dihydroxy-, and trihydroxybenzoic acids) when non-charged bitter substances are bound to the hydroxy group. As a result of surface modification by immersing the sensor electrode in a modification solution in which 2,6-dihydroxybenzoic acid was dissolved, it was confirmed that the sensor response increased with the concentration of caffeine as well as allied substances. The threshold and increase tendency were consistent with those of human senses. The detection mechanism is discussed by taking into account intramolecular and intermolecular hydrogen bonds, which cause allostery. These findings suggest that it is possible to evaluate bitterness caused by non-charged bitter substances objectively by using the taste sensor with allosteric mechanism.



2019 ◽  
Vol 91 (19) ◽  
pp. 12568-12573 ◽  
Author(s):  
Duy P. Tran ◽  
Marnie Winter ◽  
Chih-Tsung Yang ◽  
Regina Stockmann ◽  
Andreas Offenhäusser ◽  
...  




The Analyst ◽  
2018 ◽  
Vol 143 (6) ◽  
pp. 1454-1461 ◽  
Author(s):  
Kun Deng ◽  
Yong Zhang ◽  
Xue-Dong Tong

Methods based on potentiometric measurement have been developed for immunoassays, but most exhibit low sensitivities and are unsuitable for early diagnosis of disease.



2018 ◽  
Vol 20 (16) ◽  
pp. 11378-11385 ◽  
Author(s):  
Xiao-Feng Zhang ◽  
Yan Zhao ◽  
Hong-Yan Liu ◽  
Teng Zhang ◽  
Wei-Ming Liu ◽  
...  

Entropy profiling is sensitive to structural changes in the electrodes during cycling, and complementary to other techniques for studying degradation.



2017 ◽  
Vol 50 (7-8) ◽  
pp. 440-443 ◽  
Author(s):  
Philip Goldwasser ◽  
Andrea Roche-Recinos ◽  
Robert H. Barth


2017 ◽  
Vol 19 (15) ◽  
pp. 9833-9842 ◽  
Author(s):  
Xiao-Feng Zhang ◽  
Yan Zhao ◽  
Yatish Patel ◽  
Teng Zhang ◽  
Wei-Ming Liu ◽  
...  

Entropy change can be employed to track battery degradation compared with EIS and CV.



2016 ◽  
Vol 236 ◽  
pp. 1126-1132 ◽  
Author(s):  
Y. Abbas ◽  
X. Zhu ◽  
H.L. de Boer ◽  
N.B. Tanvir ◽  
W. Olthuis ◽  
...  


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