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Predicting the Soluble Solids Content of Whole Apples Using Dielectric Spectroscopy

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  2010 Pittsburgh, Pennsylvania, June 20 - June 23, 2010  1009061.(doi:10.13031/2013.32717)
Authors:   Grace P Okiror, Carol L Jones
Keywords:   Dielectric spectroscopy, soluble solids content, apples, coaxial probe

The soluble solids content of apples is one of the main factors determining their maturity and quality. Traditional methods involve destroying the samples and measuring the Brix. Numerous modern technologies such as Near Infrared Spectroscopy, multispectral scattering and laser light backscattering image analysis have been investigated with various levels of success. This research aimed at using dielectric properties of whole apples in the microwave frequencies to predict soluble solids content. A vector network analyzer with two transmission configurations was used to measure the dielectric properties in the frequency range of 200 MHz to 20 GHz. Three apple cultivars were used in this study. The partial least squares models of adjusted dielectric constant and dielectric loss factor showed strong predictions for the soluble solids content.

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