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当前位置: 首页 > 文章 > Estimation model for electrical conductivity of red grape juice 国际农业与生物工程学报 2010,3 (2)
Position: Home > Articles > Estimation model for electrical conductivity of red grape juice International Journal of Agricultural and Biological Engineering 2010,3 (2)

Estimation model for electrical conductivity of red grape juice

作  者：
Rittichai Assawaracha
单  位：
Faculty of Engineering and Agro-Industry, Maejo Universit
关键词：
12;and 1;red grape juice;concentrations;25;this stud
摘  要：
The equations for predicting the electrical conductivities of red grape juice at different concentrations have been evaluated in this study. Three samples of red grape juice having concentrations of 10.5, 12.5 and 14.5°Brix were ohmically heated by applying three different voltage gradients (10, 12 and 15 V/cm) in the temperature range of 25-80℃. The mathematical models using multiple linear regression analysis indicated that electrical conductivity depended on temperature and concentration. The predictions of electrical conductivities using the mathematical models was found to be highly accurate with R 2 value of 0.9975 when compared with the experimental data of red grape juice with concentration of 11.5°Brix. The reducing chi-square (χ 2 ) and the root mean square error ( RMSE ) from the mathematical models were calculated and compared with the experimental data. As the results, multiple linear regressions on the coefficients of the mathematical model of electrical conductivity prediction have given highest values of the R 2 and lowest χ 2 and RMSE so the established model was confirmed as highly accurate when estimating electrical conductivities of red grape juice.

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