著作: [粟飯原 睦美]/Lian Xin/[下畑 隆明]/[上番増 喬]/[馬渡 一諭]/Harada Yumi/[芥川 正武]/[木内 陽介]/[髙橋 章]/Vegetable surface sterilization system using UVA light-emitting diodes./[The Journal of Medical Investigation : JMI]
(英) Vegetable surface sterilization system using UVA light-emitting diodes.
(英) Surface sterilization of fresh produce has been needed in the food manufacturing/processing industry. Here we report a UVA-LED (Ultra Violet A-Light Emitting Diode) system for surface sterilization that is safe, efficacious, low cost, and apparently harmless to fresh produce. To test the system, Escherichia coli strain DH5 was spot-inoculated onto vegetable tissues, and treated under UVA-LED. Tissues were homogenized and bacteria quantified by colony-forming assay. Possible effects of UVA-LED on vegetable quality were evaluated by HPLC. Tissue weight changes were checked after treatment at 4, 15, and 30. Bacterial inactivation by UVA-LED radiation was observed after a 10 min treatment and increased with increasing time of irradiation. The log survival ratio reached -3.23 after a 90 min treatment. Bacterial cells surviving treatment grew slowly compared to non-irradiated control cells. Cabbage tissue lost weight over time after treatment, and weight loss increased with increasing incubation temperature, but there was no difference between losses by UVA-LED treated and control tissues at any temperature tested. In addition, no differences of Vitamin C content in cabbage tissue were detected by HPLC after UVA-LED treatment. These results suggest that UVA-LED treatment has great potential for vegetable surface sterilization in the food manufacturing/processing industry.
The Journal of Medical Investigation : JMI([徳島大学.医学部])
|年月日||必須||2014年 0月 初日|