高压均质辅助构筑CTAB改性植物精油/凹凸棒石复合抗菌材料

High pressure homogenization assisted fabrication of CTAB modified plant essential oil/palygorskite antibacterial composites

摘要:

采用高压均质辅助构筑十六烷基三甲基溴化铵（CTAB）改性植物精油/凹凸棒石复合抗菌材料，对其进行了FTIR、XRD、SEM、Zeta电位和TG测试表征。红外光谱分析表明，植物精油负载于凹凸棒石并成功实现表面改性。随CTAB用量增加，复合抗菌材料的Zeta电位由负变正。最小抑菌浓度测试结果表明，复合材料的抗菌性能随CTAB用量的增加而增强，CTAB改性明显提升了复合材料对革兰氏阳性菌的抗菌活性。当CTAB用量为2.5%时，CTAB改性香芹酚/凹凸棒石复合材料和肉桂醛/凹凸棒石复合材料对金黄色葡萄球菌的MIC值由1 g/L分别减小至0.125 g/L和0.5 g/L。

Abstract:

Plant essential oil/palygorskite composites were fabricated by high pressure homogenization and also modified using hexadecyl trimethylammonium bromide (CTAB), the structure and morphology of CTAB modified plant essential oil/palygorskite antibacterial composites were characterized by FTIR, XRD, SEM, Zeta potential and TG. FTIR results displayed that plant essential oil was loaded on palygorskite, and also successfully modified by CTAB. Zeta potential of the composites ranged from negative to positive with the increasing of CTAB dosage. Minimum inhibitory concentration (MIC) results indicated that antibacterial activities of the composites were enhanced with the increasing of CTAB content, and CTAB is beneficial to enhance the antibacterial activities of the composites. When the content of CTAB was 2.5%, the MIC values of CTAB modified carvacrol/palygorskite composites and cinnamaldehyde/palygorskite composites against S. aureus decreased from 1 g/L to 0.125 g/L and 0.5 g/L, respectively.