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Conference paper - Peer-reviewed, 2023

Simple quality prediction measurements for stored onions

Kleman, Isabella; Hellström, Maria; Rosberg, Anna Karin; Becher, Paul; Mogren, Lars


Onion (Allium cepa) is an important crop that is cultivated and consumed all over the world. It is the second most produced horticultural vegetable crop (after tomato) based on weight. In order to be available year-round in Sweden, onions must be stored for several months during the cold part of the year, when no fresh onions can be harvested. However, dormancy break resulting in early sprouting is a common quality problem during storage. Before visible sprouting, changes in the bulb chemical composition takes place, including relocation of oligosaccharides and breakdown of larger sugar molecules into smaller units that are then used as energy during the sprouting process. In this project we used a hand-held reflectometer to measure levels of mono- and disaccharides and calcium in onion bulbs that had been stored for different time periods in order to evaluate the usefulness of the method for quality control. Measured contents of glucose and calcium changed significantly during storage while sucrose content remained relatively unchanged.


Allium cepa; calcium; postharvest; reflectometry; storage; sugar

Published in

Acta Horticulturae
2023, number: 1364, pages: 183-186
Title: Proceedings of the International Symposium on Postharvest Technologies to Reduce Food Losses
ISBN: 978-94-62613-63-8
Publisher: International Society for Horticultural Science


XXXI International Horticultural Congress (IHC2022): International Symposium on Postharvest Technologies to Reduce Food Losses