Self-assembly of sophorolipid and eugenol into stable nanoemulsions for synergetic antibacterial properties through alerting membrane integrity
文献类型： 外文期刊
作者： Fan, Linlin 1 ; Su, Wei 1 ; Zhang, Xiaoqian 1 ; Yang, Suqun 1 ; Zhu, Yongsheng 1 ; Liu, Xiaoli 1 ;
作者机构： 1.Jiangsu Acad Agr Sci, Inst Agroprod Proc, Nanjing 210014, Peoples R China
2.Minist Agr & Rural Affairs, Key Lab Cold Chain Logist Technol Agroprod, Nanjing 210014, Peoples R China
关键词： Sophorolipid; Nanoemulsion; Antibacterial; Biosurfactant; Eugenol
期刊名称：COLLOIDS AND SURFACES B-BIOINTERFACES （ 影响因子：5.8； 五年影响因子：5.4 ）
ISSN： 0927-7765
年卷期： 2024 年 234 卷
页码：
收录情况： SCI
摘要： Exploring the natural, safe, and effective antimicrobial is one of the preferable ways to control foodborne bacteria. In this work, novel oil -in -water nanoemulsions were formulated with sophorolipids and eugenol without any co -surfactant using a self -assembling strategy. These nanoemulsions showed high stability with sizes less than 200 nm when exposure to low concentrations of salt ions, various pH values (5.0, 7.0, 10.0), storage temperature and time. The synergistic antibacterial effects against both Gram-negative Escherichia coli and Grampositive Bacillus cereus were determined with a minimum inhibitory concentration (MIC) value of 0.5 mg/mL and 0.125 mg/mL, respectively. Further microscopy (SEM, TEM, LCSM) examination and ATP/Na+-K+-ATPase assay results showed that the morphological changes, intensive cell membrane permeability, leakage of ATP, and decreased Na+-K+-ATPase contributed to the antibacterial effects. Moreover, the bonding mechanism between nanoemulsions and cell membranes were further evaluated by FTIR and ITC using a DPPC vesicle model, which demonstrated that the nanoemulsions adsorbed on the surface of bilayer, interacted with the hydrophobic chains of DPPC membrane mainly through the hydrophobic interaction, and altered the structural integrity of the lipid bilayer. These results not only provide a facile green strategy for fabricating stable nanoemulsions, but also highlight a new perspective for stabilizing essential oils for their widely application in food industry.
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