Electrochemical impedance spectroscopy characterization of beverages

Food Chem. 2020 Jan 1:302:125345. doi: 10.1016/j.foodchem.2019.125345. Epub 2019 Aug 8.

Abstract

This paper compares the results of standard chemical analytical processes and electrochemical impedance spectroscopy (EIS) in the characterization of different beverages, namely ground coffee, soluble coffee, coffee substitutes, barley, cow milk, vegetable drinks, tea, plant infusions and plant mixtures. For the two approaches, the similarities between the experimental data are assessed by means of the Euclidean and Canberra distances. The resulting information is processed by means of the multidimensional scaling (MDS) clustering and visualization algorithm. The results of the chemical analytical processes and EIS reveal identical clusters for the two adopted distances. Furthermore, the robustness of the experimental and computational scheme are assessed by means of the Procrustes technique. The results confirm the effectiveness of combining the EIS and MDS.

Keywords: Clustering; Electrochemical impedance spectroscopy; Multidimensional scaling; Visualization.

MeSH terms

  • Algorithms
  • Animals
  • Beverages / analysis*
  • Chemistry Techniques, Analytical / methods
  • Cluster Analysis
  • Coffee / chemistry
  • Data Visualization*
  • Dielectric Spectroscopy / methods*
  • Dielectric Spectroscopy / statistics & numerical data
  • Food Analysis / methods
  • Food Analysis / statistics & numerical data
  • Milk / chemistry
  • Signal Processing, Computer-Assisted
  • Tea / chemistry

Substances

  • Coffee
  • Tea