Next Article in Journal
Conformation-Independent QSPR Approach for the Soil Sorption Coefficient of Heterogeneous Compounds
Next Article in Special Issue
Antioxidant Activity of γ-Oryzanol: A Complex Network of Interactions
Previous Article in Journal
Pharmacological Activities of Ruthenium Complexes Related to Their NO Scavenging Properties
Previous Article in Special Issue
Role of Lipids in the Onset, Progression and Treatment of Periodontal Disease. A Systematic Review of Studies in Humans
Article Menu
Issue 8 (August) cover image

Export Article

Open AccessArticle
Int. J. Mol. Sci. 2016, 17(8), 1253; doi:10.3390/ijms17081253

Electrochemical Determination of Food Preservative Nitrite with Gold Nanoparticles/p-Aminothiophenol-Modified Gold Electrode

1
Analytical Chemistry Division, Chemistry Department, Faculty of Engineering, Istanbul University, Avcilar, 34320 Istanbul, Turkey
2
Turkish Academy of Sciences (TUBA) Piyade st. No: 27, 06690 Çankaya Ankara, Turkey
*
Author to whom correspondence should be addressed.
Academic Editor: David Arráez-Román
Received: 17 June 2016 / Revised: 24 July 2016 / Accepted: 28 July 2016 / Published: 2 August 2016
(This article belongs to the Special Issue Macro- and Micro-nutrient Antioxidants)
View Full-Text   |   Download PDF [3555 KB, uploaded 2 August 2016]   |  

Abstract

Due to the negative impact of nitrate and nitrite on human health, their presence exceeding acceptable levels is not desired in foodstuffs. Thus, nitrite determination at low concentrations is a major challenge in electroanalytical chemistry, which can be achieved by fast, cheap, and safe electrochemical sensors. In this work, the working electrode (Au) was functionalized with p-aminothiophenol (p-ATP) and modified with gold nanoparticles (Au-NPs) to manufacture the final (Au/p-ATP-Aunano) electrode in a two-step procedure. In the first step, p-ATP was electropolymerized on the electrode surface to obtain a polyaminothiophenol (PATP) coating. In the second step, Au/p-ATP-Aunano working electrode was prepared by coating the surface with the use of HAuCl4 solution and cyclic voltammetry. Determination of aqueous nitrite samples was performed with the proposed electrode (Au/p-ATP-Aunano) using square wave voltammetry (SWV) in pH 4 buffer medium. Characteristic peak potential of nitrite samples was 0.76 V, and linear calibration curves of current intensity versus concentration was linear in the range of 0.5–50 mg·L−1 nitrite with a limit of detection (LOD) of 0.12 mg·L−1. Alternatively, nitrite in sausage samples could be colorimetrically determined with high sensitivity by means of p-ATP‒modified gold nanoparticles (AuNPs) and naphthylethylene diamine as coupling agents for azo-dye formation due to enhanced charge-transfer interactions with the AuNPs surface. The slopes of the calibration lines in pure NO2 solution and in sausage sample solution, to which different concentrations of NO2 standards were added, were not significantly different from each other, confirming the robustness and interference tolerance of the method. The proposed voltammetric sensing method was validated against the colorimetric nanosensing method in sausage samples. View Full-Text
Keywords: nitrite determination; gold electrode; modified electrode; gold nanoparticles; square wave voltammetry (SWV) nitrite determination; gold electrode; modified electrode; gold nanoparticles; square wave voltammetry (SWV)
Figures

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Üzer, A.; Sağlam, Ş.; Can, Z.; Erçağ, E.; Apak, R. Electrochemical Determination of Food Preservative Nitrite with Gold Nanoparticles/p-Aminothiophenol-Modified Gold Electrode. Int. J. Mol. Sci. 2016, 17, 1253.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Int. J. Mol. Sci. EISSN 1422-0067 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top