Abstract
Ultraviolet (UV) light irradiation has demonstrated positive effects as a postharvest treatment in prolonging the storage life of fresh produce and as a non-thermal method of inactivation of pathogenic microorganisms. The objective of this research was to study the effectiveness of UV-C light irradiation as a postharvest treatment on the subsequent attachment and growth of human pathogens on fresh produce. Fresh-cut broccoli is highly perishable and susceptible to deterioration and contamination by pathogenic microorganisms after harvest. Fresh-cut broccoli branchlets were treated with UV-C doses of 2.5 and 5 kJ/m2 and inoculated with Listeria monocytogenes at various times (0, 6 and 24 h) after treatment. Growth of the bacteria on UV-C treated surfaces of broccoli branchlets was evaluated by extracting and enumerating the microorganisms on day 3, 4, 6, and 8 after treatment. Results of the study show UV-C irradiation at a dose of 5 kJ/m2 was able to restrict the growth of L. monocytogenes in the samples inoculated 24 h post treatment, with no significant differences (P=0.05) in colour and weight loss of the broccoli compared to the control treatments. These results imply UV-C treatment may be effective not just in controlling pre-existing pathogens but also reducing the risk of post-harvest contamination. Previous studies have suggested that mild stress produced by UV-C light irradiation stimulates the synthesis of defence related phytochemicals in broccoli (such as glucosinolates) which also offer a variety of health benefits. It is not yet clear whether this mechanism is also responsible for the restriction of L. monocytogenes attachment and growth after UV-C irradiation.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 4
Claim · model-written summary
UV-C at 5 kJ/m2 restricted L. monocytogenes growth when inoculation occurred 24 h later.
- Taxon
- BROCCOLI
Brassica oleracea var. italicat0 - Treatment
- UV-C irradiation at a dose of 5 kJ/m2e0
- Interactor
- L. monocytogenes
Listeria monocytogenese0pathogen - Outcome
- growth of L. monocytogenese0
- Direction
- restricte0
- Qualifier
- inoculated 24 h post treatmente0
- Comparator
- control treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Results of the study show UV-C irradiation at a dose of 5 kJ/m2 was able to restrict the growth of L. monocytogenes in the samples inoculated 24 h post treatment, with no significant differences (P=0.05) in colour and weight loss of the broccoli compared to the control treatments.”
t0“BROCCOLI”
Claim · model-written summary
UV-C treatment produced no significant difference in broccoli colour relative to controls.
- Taxon
- BROCCOLIBrassica oleracea var. italicat0
- Treatment
- UV-C irradiation at a dose of 5 kJ/m2e0
- Outcome
- coloure0
- Direction
- no significant differencese0
- Comparator
- control treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Results of the study show UV-C irradiation at a dose of 5 kJ/m2 was able to restrict the growth of L. monocytogenes in the samples inoculated 24 h post treatment, with no significant differences (P=0.05) in colour and weight loss of the broccoli compared to the control treatments.”
t0“BROCCOLI”
Claim · model-written summary
UV-C treatment produced no significant difference in broccoli weight loss relative to controls.
- Taxon
- BROCCOLIBrassica oleracea var. italicat0
- Treatment
- UV-C irradiation at a dose of 5 kJ/m2e0
- Outcome
- weight losse0
- Direction
- no significant differencese0
- Comparator
- control treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Results of the study show UV-C irradiation at a dose of 5 kJ/m2 was able to restrict the growth of L. monocytogenes in the samples inoculated 24 h post treatment, with no significant differences (P=0.05) in colour and weight loss of the broccoli compared to the control treatments.”
t0“BROCCOLI”
Claim · model-written summary
The authors suggest UV-C may reduce post-harvest contamination risk.
- Taxon
- BROCCOLIBrassica oleracea var. italicat0
- Treatment
- UV-C treatmente0
- Outcome
- reducing the risk of post-harvest contaminatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These results imply UV-C treatment may be effective not just in controlling pre-existing pathogens but also reducing the risk of post-harvest contamination.”
t0“BROCCOLI”
The same questions in other papers
uv · quality: postharvest · Brassica oleracea (wild cabbage)Positive and negative results
2 papers in the same direction as this paper · 3 in the opposite direction
- positive
- positive
- positive
2 papers more in this group
See all 6 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.