Analysis of coffee adulterated with roasted corn and roasted soybean using voltammetric electronic tongue [pdf]

Abstract

Background. Coffee samples adulterated with roasted corn and roasted soybean were analyzed using a voltammetric electronic tongue equipped with a polypyrrole sensor array. Materials and methods. Coffee samples were adulterated in concentrations of 2%, 5%, 10% and 20% of roasted corn and roasted soybean; 5 replicates of each were used. The discrimination capacity of a voltammetric electronic tongue elaborated with a polypyrrole sensor array, was evaluated by principal component analysis and cluster analysis, while the capacity to perform quantitative determinations was carried out by partial least squares. Results. The results obtained by the application of principal component analysis showed an excellent ability to discriminate adulterated samples. Additionally, the classifications obtained by cluster analysis was concordant with those obtained by principal component analysis. On the other hand, the evaluation of the ability to quantitatively analyze the adulterated samples showed that the polypyrrole sensor array provides sufficient information to allow quantitative determinations by partial least squares regression. Conclusion. It could be concluded that the voltammetric electronic tongue used in this work allows the sufficient analysis of coffee samples adulterated with roasted corn and roasted soybean.

Recent Developments in Smart Food Packaging Focused on Biobased and Biodegradable Polymers

“…Subsequently, the sample taste characteristics are obtained (Wang and Liu, 2019). Electronic tongues have found a wide range of applications for different food products such as wines (Wang et al, 2019a), fruit flavors (Németh et al, 2019;Zhu et al, 2020), coffee (Arrieta et al, 2019), and milk (Pan et al, 2019).…”

Qualitative and quasi-quantitative monitoring of drinking water through the use of a smart electronic tongue

“…Although in the electronic tongue devices have been used various analytical principles such as optical, mass, frequency measurements, among others (Khan et al, 2016;li et al, 2019;Kovacs et al, 2020;Sehra et al, 2004;Aydemir and Ebeoglu, 2018). Devices based on potentiometric and voltammetric electrochemical measurements have been more widely accepted and have shown their effectiveness in the analysis of different types of beverages (Arrieta et al, 2019;Belugina et al, 2020;Totova and Nachev, 2020;Marx et al, 2017). However, electronic tongues based on voltammetric measurements have some advantages such as greater ease of processing the sensors, low sensitivity to electronic noise, high analytical sensitivity and versatility in terms of the voltammetric technique used (square wave, cyclic, pulse, etc.).…”