Chlorophyll Fluorescence as a Nondestructive Indicator of Broccoli Quality during Storage in Modified-atmosphere Packaging release_eabocwtsm5d7jewm6zescfvbbu

by Jennifer R. DeEll, Peter M.A. Toivonen

Abstract

The objective of this study was to determine if chlorophyll fluorescence could be used as an indicator of anaerobic respiration in broccoli (<jats:italic>Brassica oleracea</jats:italic> L., Italica group) during modified-atmosphere packaging (MAP). Two types of packages were used, PD-941 bags, which provided optimum MAP conditions for broccoli (≈3 kPa O<jats:sub>2</jats:sub> plus 5 kPa CO<jats:sub>2</jats:sub>), and PD-961EZ bags, which allowed the CO<jats:sub>2</jats:sub> to accumulate (≈11 kPa CO<jats:sub>2</jats:sub>). After 28 days in MAP at 1 °C, the broccoli from both types of bag had similar appearances and weight losses. However, broccoli held in the PD-961EZ bags had developed slight to moderate alcoholic off-odors and had higher ethanol, acetaldehyde, and ethyl acetate content, as compared with broccoli in PD-941 bags. Chlorophyll fluorescence parameters (Fv/Fm, T<jats:sub>1/2</jats:sub>, Fmd, and Φ<jats:sub>PSII</jats:sub>) were lower for broccoli held in the PD-961EZ bags than in PD-941 bags, and these differences increased with storage duration. These results indicate that chlorophyll fluorescence is a reliable, rapid, nondestructive indicator of broccoli quality during MAP, and that it could be used to determine if broccoli has developed off-odors without opening the bag and disrupting the package atmosphere.
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Published in Hortscience by American Society for Horticultural Science
ISSN-L 0018-5345
Volume 35
Page(s) 256-259
Release Year 2000
Publisher American Society for Horticultural Science

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