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Efficient methods to achieve the safe decontamination of agricultural products are needed. Here, we investigated the decontamination of citrus fruits to test the antifungal potential of a novel non-thermal gas plasma apparatus, termed a roller conveyer plasma instrument. This instrument generates an atmospheric pressure dielectric barrier discharge (APDBP) plasma on a set of rollers.  Penicillium venetum  was spotted onto the surface of the fruit or pericarps, as well as an aluminium plate to act as a control, before performing the plasma treatment. The results showed that viable cell number of  P. venetum  decreased with a decimal reduction time ( D  value or estimated treatment time required to reduce viable cell number by 90%) of 0.967 min on the aluminium plate, 2.90 min and 1.88 min on the pericarps of ‘Kiyomi’ ( Citrus unshiu  ×  C. sinensis ) and ‘Kawano-natsudaidai’ ( C. natsudaidai ) respectively, and 2.42 min on the surface of ‘Unshu-mikan’ ( C. unshiu ). These findings confirmed a fungicidal effect of the plasma not only on an abiotic surface (aluminium plate) but also on a biotic surface (citrus fruit). Further development of the instrument by combining sorting systems with the plasma device promises an efficient means of disinfecting citrus fruits during food processing.

Application of a roller conveyor type plasma disinfection device with fungus-contaminated citrus fruits