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Effect of industrial and natural biocides on spoilage, pathogenic and technological strains grown in biofilm

机译：工业和天然杀菌剂对生物膜中腐败变质，致病和技术菌株的影响

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This study aimed at investigating bactericide solutions effective on spoilage and pathogenic bacteria while preserving technological bacteria. Two compounds of essential oil (thymol and eugenol), one essential oil of Satureja thymbra and two industrial biocides (PE 270-30, Brillo) were tested on technological strains (Staphylococcus equorum, Staphylococcus succinus and Lactobacillus sakei) grown in monoculture biofilm and on a mixed biofilm of pathogenic bacteria (Staphylococcus aureus, Listeria monocytogenes) and spoilage bacteria (Pseudomonas fragi, Escherichia coli). Biofilm cultures were performed in glass fibre filters for 24 h at 20℃ before application of biocides. Thymol and eugenol had no effect on the mixed biofilm. S. thymbra (2%) was highly effective on spoilage strains (5 log reduction), and S. equorum (4 log reduction) was moderately effective on pathogens (2.3 log reduction) and not effective on S. succinus and L. sakei (0.5 log reduction). PE-270-30 with 10% Na_2SO_4 decreased spoilage bacteria (5.1 log reduction), maintained the technological bacteria, but did not reduce the pathogens. The disinfectant Brillo (3%) killed all the strains. These results showed the difficulty in obtaining a biocide that is effective in destroying spoilage and pathogenic bacteria while preserving technological bacteria. Essential oils could be a good alternative for eradicating spoilage bacteria in the food environment where they are often found at high levels.
机译：这项研究旨在研究对腐烂和致病细菌有效的杀菌剂溶液，同时保留技术细菌。在单一培养生物膜上和在其上生长的技术菌株（马尾葡萄球菌，琥珀酸葡萄球菌和日本乳杆菌）上测试了两种精油化合物（百里香酚和丁香酚），一种Satureja thymbra精油和两种工业杀菌剂（PE 270-30，Brillo）。病原菌（金黄色葡萄球菌，单核细胞增多性李斯特菌）和腐败菌（脆弱假单胞菌，大肠杆菌）的混合生物膜。在施用杀生物剂之前，先在玻璃纤维滤器中于20℃进行24 h生物膜培养。百里酚和丁子香酚对混合生物膜没有影响。胸腺沙门氏菌（2％）对腐败菌株非常有效（减少了5 log），equequum（S.equorum）（减少了4 log）对病原体具有中等效力（减少了2.3 log），而对S.succinus和L.减少0.5个对数）。含有10％Na_2SO_4的PE-270-30减少了变质细菌（减少了5.1 log），保持了技术细菌，但没有减少病原体。消毒剂Brillo（3％）杀死了所有菌株。这些结果表明，难以获得在破坏技术细菌的同时有效破坏腐败和致病细菌的杀生物剂。精油可能是消除食品环境中腐败菌的良好替代品，而在食品环境中腐败菌的含量通常很高。

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