Correlation between the results of electronic tongue measurement and the difference threshold of human sensory evaluation

German physiologist Weber has done such an experiment: a person holding a weight of 300 grams in his right hand, then put a weight of 305 grams on his left hand, he does not feel much difference until the weight of the left hand plus It will feel a little heavy when it is 306 grams. If the right hand is holding 600 grams, then the weight on the left hand should reach 612 grams to feel heavy. In other words, the heavier the original weight, the later it is necessary to add a larger amount to feel the difference. This phenomenon is called "Weber's Law." Weber found that the same amount of stimulation must reach a certain proportion in order to cause a difference. This ratio is a constant and is expressed by the formula: Δr (stimulus difference) / r (stimulus) = k (constant), which is Weber's law.

Weber's law shows that if the standard stimuli used to compare the abilities of a certain individual are different, the absolute value of the difference threshold cannot be used for comparison, but the Weber score is used for comparison. The smaller the Weber score, the more sensitive it is. Zhang Aixia et al. studied the basic flavors of acid tongues for acid, sweet, bitter, salty and fresh varieties as the difference threshold and Weber score. (The following data and results are from Dr. Zhang Aixia's paper "Research on the Methodology of Electronic Tongue Based on Difference Test")

Figure 1: Weber score data for people's perception of basic taste

Figure 2: Basic taste of the electronic tongue measurement Weber score

According to the above research results, the sensitivity of the electronic tongue to citric acid, tartaric acid, AK sugar, sodium chloride, potassium chloride, sodium glutamate is much higher than that of human sensory organs. The detection sensitivity of the electronic tongue to sulphate is close to that of the human sensory organ.

The above experiment uses a volt-ampere electronic tongue composed of a noble metal bare electrode, and uses a relaxation pulse as an excitation signal to collect the current response signal of the sample, and extracts effective eigenvalues ​​by mathematical analysis. Finally, the pattern recognition method is used for analysis. . It can carry out real and false identification of liquid foods such as alcohol, beverages, tea, etc., product quality control and shelf life of brand enterprises, rapid detection of pesticide residues, and rapid detection of pathogenic microorganisms. Shanghai Baosheng Industrial Development Co., Ltd. has carried out long-term experiments and applied research, and has accumulated many mature application examples. If you need to communicate in detail, please contact Shanghai Baosheng Industrial Development Co., Ltd.

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