1. An "intelligent -responsive" bactericidal system based on OSA-starch Pickering emulsion.
- Author
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Wang, Rui, Yao, Lishan, Peng, Shurui, Liu, Zhenbin, Zhu, Xiaolin, Li, Hongbo, Xu, Dan, Zhang, Jiayi, Mo, Haizhen, and Hu, Liangbin
- Subjects
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THYMOL , *EMULSIONS , *LIPID peroxidation (Biology) , *ESCHERICHIA coli , *NUCLEAR magnetic resonance , *ASPERGILLUS flavus , *CORNSTARCH - Abstract
Pickering emulsion based on OSA-starch was developed in this study as an intelligent delivery system for the application of thymol against foodborne pathogens. Morphology and microstructure characterization showed that the Pickering emulsion was an O/W type emulsion and stayed stable at starch concentration of 200 mg/mL and oil fraction at 30 % with particle size of 10 μm and absolute Zeta potential of −12.5 mV. Low field nuclear magnetic resonance and rheology experiments indicated that a denser network structure was formed in this stable Pickering emulsion. Besides, the Pickering emulsion could endure long-time storage, low pH (3,5) and additional NaCl (50, 100, 200, 400 mM) and it showed enhanced bactericidal effects against Escherichia coli , Staphylococcus aureus (thymol =1.48 μmol/L) and Aspergillus flavus (thymol = 0.624 μmol/L) by inducing ROS eruption, membrane lipid peroxidation and cell shrink. Moreover, the bactericidal assay demonstrated that thymol could be intelligently released and a considerable 75 % timely bactericidal effect was detected after 9 days' intermittently exposing to E. coli , S. aureus and A. flavus in vitro, by comparison thymol alone showed only 20 % bactericidal effect due to its volatility. The results are of great importance to offer an intelligent delivery system of bio-actives defending foodborne pathogens. [Display omitted] [ABSTRACT FROM AUTHOR]
- Published
- 2023
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