Traditional quality control methods rely on visual inspection, with workers manually sorting onions based on external appearance. (Image courtesy of Pixabay/CCL)
SEOUL, Nov. 18 (Korea Bizwire) – In a breakthrough that could significantly reduce food waste, South Korean agricultural researchers have developed and patented a novel technology using magnetic resonance imaging (MRI) to predict the quality of stored onions.
The Rural Development Administration (RDA) announced on November 18 that the new technology addresses a persistent problem in onion storage. Currently, onions harvested in May and June are stored in temperature-controlled facilities for up to eight months until the following spring.
However, decay rates reach 25-40%, as a single spoiled onion can trigger rapid deterioration of surrounding produce.
Onions imaged by MRI (Image provided by the Rural Development Administration (RDA))
Traditional quality control methods rely on visual inspection, with workers manually sorting onions based on external appearance. The new technology, developed in collaboration with Jeonbuk National University, combines MRI data with shape standardization rates and RGB color analysis to assess internal quality.
The system works by detecting early sprouting within onions, a physiological process that occurs just before decay sets in. The MRI captures shadow differences between sprouted areas and other parts of the onion, which are then analyzed using a specially developed “sprout occurrence index-based quality chart” to predict deterioration levels.
“While industrial applications of MRI exist in other countries, this technology is unique in combining post-harvest physiological expertise with image interpretation and linked quality indicators, making it more versatile,” said Kim Seong Min, a professor at Jeonbuk National University who participated in the research.
The innovation marks a significant advance in storage onion selection methods by correlating MRI data with storage potential, shape, and taste characteristics. However, implementation challenges remain.
“While this technology is essential for modernizing stored onion quality management, widespread adoption will require the commercialization of imaging equipment and training of specialists,” said Lim Jong-guk, director of the Storage and Distribution Division at the National Institute of Horticultural and Herbal Science.
“We plan to optimize onion storage technology and reduce decay rates through technical cooperation with sorting equipment manufacturers and field verification.”
Ashley Song (ashley@koreabizwire.com)
