ASSESSMENT OF THE TOTAL SOLIDS AND FAT CONTENTS IN WHOLE LIQUID EGG PRODUCTS BY ELECTRICAL AND THERMAL CONDUCTIVITY MEASUREMENTS

  • Annachiara Berardinelli | annachi.berardinel-li@unibo.it Department of Agricultural Economics and Engineering DEIAgra, University of Bologna, Italy.
  • Luigi Ragni Department of Agricultural Economics and Engineering DEIAgra, University of Bologna, Italy.
  • Chiara Cevoli Department of Agricultural Economics and Engineering DEIAgra, University of Bologna, Italy.
  • Adriano Guarnieri Department of Agricultural Economics and Engineering DEIAgra, University of Bologna, Italy.

Abstract

The total solids and fat contents of nine whole liquid egg products were assessed by means of electrical and thermal conductivity measurements. Linear correlations between conductivity values and total solids and fat contents were obtained with R2 values up to 0.995 and 0.990 and maximum errors of predic- 46 TABLE 6 - Linear regression models for the total solids (TS, %) and fat (FC, %) contents estimation from electrical (Ec, mS/cm) and thermal (Tc, W/mK) conductivity measurements. SE: Standard Error. Linear regression equation R2 p-level SE (%) TS=-6.857*Ec+65.373 0.995 0.000 0.27 FC=-4.993*Ec+40.070 0.985 0.000 0.33 TS=-172.967*Tc+109.605 0.992 0.000 0.33 FC=-126.449*Tc+72.521 0.990 0.000 0.27 tion up to 0.41% and 0.42%, respectively. The electrical conductivity of the albumen, yolk and egg mixtures linearly increased with temperature; at 20°C, temperature coefficients of 2.1%/°C, 2.1%/°C and 1.9 %/°C were respectively calculated. On the contrary, the thermal conductivity of the analysed products did not appear to be substantially influenced by the temperature of the liquid.

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Published
2012-06-30
Section
Original Articles
Keywords:
whole liquid egg products, total solids content, fat content, electrical conductivity, thermal conductivity.
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How to Cite
Berardinelli, A., Ragni, L., Cevoli, C., & Guarnieri, A. (2012). ASSESSMENT OF THE TOTAL SOLIDS AND FAT CONTENTS IN WHOLE LIQUID EGG PRODUCTS BY ELECTRICAL AND THERMAL CONDUCTIVITY MEASUREMENTS. Journal of Agricultural Engineering, 42(1), 41-47. https://doi.org/10.4081/jae.2011.1.40

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