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Identification of freeze damage in oranges using gas sensor

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

Citation:  Paper number  036168,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.14148) @2003
Authors:   Eunice S. Tan, David C. Slaughter, James F. Thompson
Keywords:   Electronic nose, carbon dioxide, ethanol, nondestructive, fruit quality

Three volatile sensing systems and two sampling methods were evaluated to determine their ability to detect freeze damage in Valencia oranges (Citrus sinensis (L.) Osbeck Valencia) 24 hours after laboratory-simulated freezing. Carbon dioxide and ethanol were measured using handheld gas sensors and an electronic nose was employed to measure the overall gas profile of each orange. For carbon dioxide, optimal classification was obtained using internal gas sampling with a classification accuracy of 87% and 47% for unfrozen and partially frozen Valencia oranges. Discrimination using ethanol was optimal using headspace gas sampling and correctly classified 100% of sound fruit but only 40% of the partially frozen fruit. In general, sensing of the overall volatile composition using an electronic nose resulted in a more balanced classification than by sensing individual components such as carbon dioxide and ethanol. The electronic nose correctly classified approximately 73% and 74% of sound fruit and 70% and 67% of the partially frozen fruit with headspace and internal gas sampling methods respectively.

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