Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 68, Issue 33, Pages 8890-8899Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.0c00116
Keywords
chitosan nanogel; Pickering biocatalytic emulsion; phase inversion
Funding
- Fundamental Research Funds for the Central Universities (SCUT) [2019MS097]
- Chinese National Natural Science Foundation [31371744, 31801486]
- Guangdong Academy of Agricultural Sciences Foundation [201903]
- Guangdong Academy of Sciences Special Funding Projects for Construction of Domestic First-Class Research Institutions [2020GDASYL-20200102007]
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Here, a simple food-grade Pickering emulsion system is prepared and adopted for biphasic biocatalytic reactions. The chitosan nanogels were prepared with strong dispersion of chitosan aggregates approaching neutral pH and then used as the particle emulsifiers to produce oil-in-water Pickering emulsions. The chitosan nanogel exhibited high affinity to negatively charged lipase. As a result of increasing the biphasic interfacial area and loading amount on the oil-water interface, the catalysis activity of lipase and recycling and pH stability were highly enhanced through colorimetric determination of p-nitrophenol (the hydrolysis product of p-nitrophenyl palmitate). A general strategy was proposed to obtain stimulus-responsive Pickering emulsions that can undergo phase inversion. The in situ modification of the wettability of chitosan nanogel could be attributed to the interaction between nanogel and free fatty acids, which was triggered by lipase hydrolysis. This would permit a rapid and controlled release of hydrophobic active components in response to enzymatic triggers.
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