A voltammetric pH sensor for food and biological matrices

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F20%3A00531445" target="_blank" >RIV/61388955:_____/20:00531445 - isvavai.cz</a>

Result on the web

<a href="http://hdl.handle.net/11104/0310110" target="_blank" >http://hdl.handle.net/11104/0310110</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.snb.2020.128650" target="_blank" >10.1016/j.snb.2020.128650</a>

Result language

angličtina

Original language name

A voltammetric pH sensor for food and biological matrices

Original language description

Measurement of pH is of fundamental importance in a wide range of environmental, biological and industrial applications. Glass electrode and litmus paper are widely used for this, but the former is difficult to miniaturize, prone to drift and fragile, the latter is inaccurate. This paper describes a pH sensor based on an indoaniline-derivative (4-((4-aminophenyl)imino)-2,6-dimethoxycyclohexa-2,5-dien-1-one), which exploits alternating current voltammetry to measure pH in the range between 2 and 12. The synthetized indoaniline-derivative was not genotoxic (A. cepa assay), and the sensor reliably measured pH in milk, tea, orange juice, blood, urine and saliva. Results were comparable with those obtained with a glass electrode calibrated with certified solutions (maximum relative standard deviation of 3 % and accuracy less than 0.2 pH unit). The sensor had negligible hysteresis, an almost Nernstian sensitivity (56 mV/pH) and was fully functional after a two-month storage. Sensor response showed a limited dependence on temperature (0.14 mV per pH unit and °C) and limited sensitivity to possible interferents such as lithium and sodium ions, its response to these was similar to that of a glass electrode, and was absent for ascorbic acid.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10405 - Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2020

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Sensors and Actuators B - Chemical

ISSN

0925-4005

e-ISSN

—

Volume of the periodical

322

Issue of the periodical within the volume

NOV 2020

Country of publishing house

CH - SWITZERLAND

Number of pages

9

Pages from-to

128650

UT code for WoS article

000576524400006

EID of the result in the Scopus database

2-s2.0-85088937214