Bactericidal effect of UVA combined with isothiocyanate on enteropatho-genic Escherichia coli and Vibrio parahaemolyticus
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摘要:
目的 研究紫外线A发光二极管(UVA-LED)与植物化学物烯丙基异硫氰酸盐(AITC)联合对两种致腹泻病原菌的杀菌效果。 方法 以肠致病性大肠杆菌和副溶血性弧菌两种致腹泻病原菌为受试对象,采用不同浓度的烯丙基异硫氰酸盐与UVA365 nm-LED结合进行二因素3 × 2析因设计杀菌实验,以菌落形成单位(CFU)计数细菌存活量并计算各自存活率对数值,然后进行析因设计的方差分析,并做交互效应图。 结果 单独AITC的杀菌效果随着浓度的增高而逐渐增强(P < 0.05),而且UVA365 nm -LED与AITC联合对2种致病菌的效应差异都具有统计学意义(P < 0.05)。UVA-LED和1 mg/mL AITC联用时副溶血性弧菌的存活率降低至 – 6.15 lg。 结论 UVA-LED与烯丙基异硫氰酸盐的联用,对肠致病性大肠杆菌和副溶血弧菌的杀菌效果都存在显著的协同作用。 Abstract:Objective To study bactericidal effect of ultraviolet A – light emitting diode (UVA-LED) irradiation combined with phytochemical of allyl isothiocyanate (AITC) on two diarrhea-causing pathogens. Methods Two diarrhea-causing pathogenic bacteria, enteropathogenic Escherichia coli (ETEC) and Vibrio parahaemolyticus (VP), were used as the subjects. Bactericidal experiments in 3 × 2 factorial design were performed with the combined treatment of different concentrations of AITC and UVA365 nm-LED irradiation; and the bacteria survival was assessed with colony form unit (CFU) and logarithm value of survival rate was calculated. The interactive effect of AITC and UVA365 nm-LED irradiation was evaluated with analysis of variance for factorial design and illustrated with schematic diagram. Results The bactericidal effect of AITC alone was gradually increased with the increment of concentration (P < 0.05). The effect of the combination of UVA-LED irradiation with AITC on the two pathogenic bacteria were statistically significant (P < 0.05). When UVA365 nm irradiation was combined with 1 mg/ml AITC, the survive ratio of Vibrio parahaemolyticus was even reduced to – 6.15 lg. Conclusion Synergistic bactericidal effect exists for combined treatment of UVA-LED irradiation and AITC on ETEC and VP. -
表 1 UVA与AITC联用对大肠杆菌存活率的一般线性模型方差分析表
项目 Ⅲ类平方和 自由度 均方 F 值 P 值 修正模型 42.532 a 5 8.506 648.654 0.000 截距 61.535 1 61.535 4692.402 0.000 UVA照射 18.963 1 18.963 1446.069 0.000 AITC 17.281 2 8.640 658.868 0.000 UVA照射x AITC 6.288 2 3.144 239.731 0.000 误差 0.315 24 0.013 总计 104.381 30 修正后总计 42.846 29 注:a R2 = 0.993,调整后R2 = 0.991。 表 2 UVA与AITC联用对副溶血弧菌存活率的一般线性模型方差分析表
项目 Ⅲ类平方和 自由度 均方 F 值 P 值 修正模型 118.983 a 5 23.797 96.985 0.000 截距 130.106 1 130.106 530.262 0.000 UVA照射 56.317 2 28.159 114.764 0.000 AITC 51.954 1 51.954 211.745 0.000 UVA照射x AITC 10.711 2 5.356 21.827 0.000 误差 5.889 24 0.245 总计 254.978 30 修正后总计 124.871 29 注:a R2 = 0.973,调整后R2 = 0.961。 -
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