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Highly sensitive amperometric detection of hydrogen peroxide in saliva based on N-doped graphene nanoribbons and MnO$_2$ modified carbon paste electrodes
ID Gričar, Ema (Author), ID Kalcher, Kurt (Author), ID Genorio, Boštjan (Author), ID Kolar, Mitja (Author)

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Abstract
Four different graphene-based nanomaterials (htGO, N-htGO, htGONR, and N-htGONR) were synthesized, characterized, and used as a modifier of carbon paste electrode (CPE) in order to produce a reliable, precise, and highly sensitive non-enzymatic amperometric hydrogen peroxide sensor for complex matrices. CPE, with their robustness, reliability, and ease of modification, present a convenient starting point for the development of new sensors. Modification of CPE was optimized by systematically changing the type and concentration of materials in the modifier and studying the prepared electrode surface by cyclic voltammetry. N-htGONR in combination with manganese dioxide (1:1 ratio) proved to be the most appropriate material for detection of hydrogen peroxide in pharmaceutical and saliva matrices. The developed sensor exhibited a wide linear range (1.0–300 µM) and an excellent limit of detection (0.08 µM) and reproducibility, as well as high sensitivity and stability. The sensor was successfully applied to real sample analysis, where the recovery values for a commercially obtained pharmaceutical product were between 94.3% and 98.0%. Saliva samples of a user of the pharmaceutical product were also successfully analyzed.

Language:English
Keywords:electrochemical sensors, hydrogen peroxide, graphene, graphene nanoribbons, amperometry
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:FKKT - Faculty of Chemistry and Chemical Technology
Publication status:Published
Publication version:Version of Record
Year:2021
Number of pages:13 str.
Numbering:Vol. 21, iss. 24, art. 8301
PID:20.500.12556/RUL-136594 This link opens in a new window
UDC:543.553
ISSN on article:1424-8220
DOI:10.3390/s21248301 This link opens in a new window
COBISS.SI-ID:89121539 This link opens in a new window
Publication date in RUL:12.05.2022
Views:488
Downloads:153
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Record is a part of a journal

Title:Sensors
Shortened title:Sensors
Publisher:MDPI
ISSN:1424-8220
COBISS.SI-ID:10176278 This link opens in a new window

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Licensing start date:11.12.2021

Secondary language

Language:Slovenian
Keywords:elektrokemijski senzorji, vodikov peroksid, grafen, grafenski nanotrakovi, amperometrija

Projects

Funder:ARRS - Slovenian Research Agency
Project number:P1-0153
Name:Raziskave in razvoj analiznih metod in postopkov

Funder:ARRS - Slovenian Research Agency
Project number:P1-0175
Name:Napredna anorganska kemija

Funder:ARRS - Slovenian Research Agency
Project number:N2-0087
Name:Razvoj novih membran in elektrod na osnovi grafena za uporabo v etanolovih gorivnih celicah

Funder:Other - Other funder or multiple funders
Funding programme:GoStyria! scholarship program for post-graduate students

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