As an alternative of traditional mercury lamps, LED deep ultraviolet lamps have a wide application prospect in the food sterilization field.Firstly, by taking took Escherichia coli as the experimental object, an appropriate combination scheme of deep ultraviolet lamp was explored.Secondly, using the combination of LED deep ultraviolet lamp to sterilize E.coli, Staphylococcus aureus and Pseudomonas aeruginosa with different duration of deep ultraviolet light, the effect of deep ultraviolet irradiation time on the bactericide rate of different pathogenic bacteria was studied.Finally, the effect of LED deep ultraviolet radiation on strawberry preservation was explored by regular investigation of their bad fruit rate, decay index, weight loss rate and sensory changes.In the study, it was found that the sterilizing effect was best when there were three LED deep ultraviolet lamps on the top and the side of the plate, and the bactericide rate increased with the extension of irradiation time.The sensitivity to LED deep ultraviolet light showed:S.aureus<P.aeruginosa<E.coli.After strawberries were picked, LED deep ultraviolet treatment for a proper duration had a good effect on disease control and quality assurance.In addition, LED deep ultraviolet treatment and sealed refrigeration had a synergistic effect on improving strawberry freshness preservation effect.
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