【摘要】 目的研究聚硅氧烷季铵盐微乳液在化妆品中的抑菌效果。方法采用平板菌落计数法比较浓度为0.10%的聚硅氧烷季铵盐微乳液、聚硅氧烷季铵盐乳液和聚硅氧烷微乳液对大肠杆菌的抑菌效果;将防腐剂稀释,浓度分别为0.1、0.2、0.4、0.6、0.8、1.0、1.5、2.0、2.5、3.0、3.5、5.0g/L,确定最小抑菌浓度;采用一次加菌28d的微生物防腐挑战试验比较三种防腐剂抗细菌和抗真菌的能力,采用比浊法考察防腐剂对大肠杆菌的抑菌动力学曲线。结果 1.0g/L的聚硅氧烷季铵盐微乳液、聚硅氧烷季铵盐乳液和聚硅氧烷微乳液对大肠杆菌的抑菌率分别为100.00%,91.16%,84.66%;聚硅氧烷季铵盐微乳液的最小抑菌浓度分别为1.0g/L(抑大肠杆菌)和0.8g/L(抑金黄色葡萄球菌)。一次加菌28d的微生物防腐挑战试验结果显示,聚硅氧烷季铵盐微乳液顺利通过了抗细菌和抗真菌的测试,聚硅氧烷季铵盐乳液通过了抗真菌测试但未能通过抗细菌的测试,而聚硅氧烷微乳液均未通过抗细菌和抗真菌的测试;聚硅氧烷季铵盐微乳液能较长时间将大肠杆菌的生长抑制在一个较低水平。结论聚硅氧烷季铵盐微乳液对化妆品污染中的常见菌种都有较强的抑制作用。更多还原

【Abstract】 Objective To investigate the antibacterial performance of silicone quaternary ammonium microemulsion in cosmetics.Methods The bacteriostatic effects of three preservatives(0.10% silicone quaternary ammonium microemulsion,silicone quaternary ammonium emulsion and silicone quaternary microemulsion) were compared in terms of plate culture count.Three preservatives were diluted to 0.1,0.2,0.4,0.6,0.8,1.0,1.5,2.0,2.5,3.0,3.5,5.0 g/L respectively,and the minimal inhibitory concentration was explored.The antibacterial and anti-fungi ability of the three preservatives was compared based on the microbial challenge test of 28 days.The bacteriostasis kinetics of the Escherichia coli(E.coli) was studied with the turbidimetry.Results The bacteriostasis rate of 1.0 g/L silicone quaternary ammonium microemulsion,silicone quaternary ammonium emulsion and silicone quaternary microemulsion were 100.00%,91.16% and 84.66%,respectively.The minimum bacteriostasis concentration of silicone quaternary ammonium microemulsion was 1.0 g/L for E.coli and was 0.8 g/L for Staphylococcus aureus,respectively.The results of microbial challenge experiments indicated that silicone quaternary ammonium microemulsion could pass both the antibacterial and the anti-fungi tests.Silicone quaternary ammonium emulsion could also pass the antibacterial test but failed in the anti-fungi test.However,silicone quaternary microemulsion failed in the both tests.The growth rate of E.coli was inhibited in a low level by silicone quaternary ammonium microemulsion.Conclusion Silicone quaternary ammonium microemulsion can effectively inhibit the common bacteria in cosmetics.更多还原