Lazouskaya Maryna, Vetik Iuliia, Tamm Martti, Uppuluri Kiranmai, Scheler Ott
School of Science, Department of Chemistry and Biotechnology, Tallinn University of Technology, Ehitajate tee 5, 19086 Tallinn, Estonia.
Center of Food and Fermentation Technologies (TFTAK), Mäealuse 2/4, 12618 Tallinn, Estonia.
ACS Omega. 2023 Mar 30;8(14):13275-13284. doi: 10.1021/acsomega.3c00538. eCollection 2023 Apr 11.
Glass electrodes are the only type of pH-sensitive electrodes currently used in the food industry. While widely used, they have several disadvantages, especially in the areas of brittleness and price. Ruthenium(IV) oxide (RuO) pH electrodes are a well-known alternative to conventional glass electrodes, providing improved durability and lower price. Nevertheless, partial substitution of RuO with cupric oxide (CuO) would further lower the price and reduce the toxicity of the electrode. In this paper, we present the applicability of RuO-CuO electrodes for pH measurement in food samples. The electrodes were fabricated by screen printing and covered with a protective Nafion membrane. In the experiments with food samples, the RuO-CuO electrodes outperformed RuO electrodes in measuring the pH with an almost twofold higher rate of accurate measurements. The utilization of CuO for the fabrication of pH electrodes allowed the accurate measurement of pH in a larger variety of food samples without compromising the response time.
玻璃电极是目前食品工业中唯一使用的一类对pH敏感的电极。虽然被广泛使用，但它们有几个缺点，特别是在脆性和价格方面。氧化钌（RuO）pH电极是传统玻璃电极的一种知名替代品，具有更高的耐用性和更低的价格。然而，用氧化铜（CuO）部分替代RuO将进一步降低价格并降低电极的毒性。在本文中，我们展示了RuO-CuO电极在食品样品pH测量中的适用性。这些电极通过丝网印刷制成，并覆盖有一层保护性的Nafion膜。在食品样品实验中，RuO-CuO电极在测量pH时的表现优于RuO电极，准确测量率几乎高出一倍。利用CuO制造pH电极能够在不影响响应时间的情况下，对更多种类的食品样品进行准确的pH测量。
