Abstract:
In the current situation, Thailand has started to enter a society with an aging population. Problems encountered in the elderly are related to digestion of food. Therefore, the texture of the food plays an important role to consider. Using various techniques to check the texture of food without destroying samples, it is a good option to be able to control the quality of the texture to meet the standard quality to check the texture of the food. The technique of non-destructive inspection using electrical properties was studied in this research. This experiment was based on the consideration of external and chemical properties in order to create an equation to predict the value of the texture and total solubility in food. In the technique of electrical properties, experiments were conducted on the firmness of jelly and soft tofu. The production of jelly and soft tofu had different firmness. Each sample was measured electrical properties such as capacitance, inductor, resistance, distribution factor, quality factor, phase angle at various frequencies (0.012, 0.05, 0.1, 0.5, 1, 5, 10, 50, 100 and 200 KHz) and consider the physical properties which were firmness. Analyzed from statistical data by using ready- made statistical analysis program (The Unscrambler) and use the partial least squares regression (PLSR) method. In the experiment, the firmness of the jelly was analyzed by using 81 samples for calibration and 39 samples for prediction. The accuracy of the model in the prediction set obtained the coefficient of determination (R2) at 0.636 and the root mean square error of prediction (RMSEP) at 0.128 N. The results showed that electrical measurement techniques could be used to find the firmness of jellies. For the soft tofu firmness experiment, data were analyzed using 65 samples for calibration and use 32 Samples for prediction. The accuracy of the model in the prediction set obtained the coefficient of determination (R2) at 0.505 and the root mean square error of prediction (RMSEP) at 6.017 N. The results showed that electrical measurement techniques could be used to find the firmness of soft tofu.