Impedimetric sensing of honey adulterated with high fructose corn syrup. (December 2021)

• Record Type: Journal Article
• Authors: Huang, Ta-Kang; Chuang, Min-Chieh; Kung, Yi; Hsieh, Bo-Chuan
• Is Part Of: Food control. Volume 130(2021)
• Publication Date: 2021-12
• Subjects: Honey adulteration -- High fructose corn syrup -- Impedance -- Label-free -- Reagentless; Food -- Quality -- Periodicals; Food -- Analysis -- Periodicals; Food handling -- Periodicals; Food industry and trade -- Quality control -- Periodicals; Aliments -- Industrie et commerce -- Qualité -- Contrôle -- Périodiques; Aliments -- Qualité -- Périodiques; Aliments -- Analyse -- Périodiques; Hygiène alimentaire -- Périodiques; Food -- Analysis; Food handling; Food -- Quality; Periodicals; Electronic journals; 664.07
• DOI: 10.1016/j.foodcont.2021.108326
• Languages: English
• ISSNs: 0956-7135

Abstract

Abstract: Honey adulteration is a highlighted global issue in the modern food supply chain, the most commonly seen case is to cut honey with cheap and easily available sugar-based sweeteners, such as high fructose corn syrup (HFCS). To acquire a precise impedimetric response from such a high resistance sample, a low cell constant (13.9 cm −1 ) electrochemical chamber composed of two identical bare gold electrodes was developed for investigating the impedimetric differences among pure honey, blended honey, and HFCS. Charge transfer resistance (RCT ) and logarithmic impedance (Log Z, in a broad frequency range of 10 1 –10 5 Hz) were useful to discriminate all pure honeys from blended honeys with good resolution and reproducibility (relative standard deviations of RCT and Log Z were both less than 3% in triplicate tests). The data acquisition time for obtaining RCT and Log Z were only 3 min and 4 s, respectively, which means the proposed sensing approach is suitable for routine rapid screening purpose. Highlights: A low cell constant electrochemical chamber was constructed to measure the impedance of high resistance honey sample. A simply modified Randles model was used to solve the inaccuracy of impedimetric sensing in the non-ideal diffusion medium. The impedimetric difference between pure and HFCS-adulterated honey can be used to discriminate adulteration. Charge transfer resistance (RCT ) and logarithmic impedance (Log Z) are potential indices for rapid screening.