Starch-based Janus particle: Fabrication, characterization and interfacial properties in stabilizing Pickering emulsion

Haifeng Tong; Juan Wang; Liang Qi; Qunyu Gao

doi:10.1016/j.carbpol.2023.120867

Starch-based Janus particle: Fabrication, characterization and interfacial properties in stabilizing Pickering emulsion

Carbohydr Polym. 2023 Aug 1:313:120867. doi: 10.1016/j.carbpol.2023.120867. Epub 2023 Mar 30.

Authors

Haifeng Tong¹, Juan Wang¹, Liang Qi², Qunyu Gao³

Affiliations

¹ Carbohydrate Laboratory, School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, PR China ⁠; Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, Guangzhou 510640, PR China.
² Carbohydrate Laboratory, School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, PR China ⁠; Heyuan Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Heyuan 517000, PR China; Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, Guangzhou 510640, PR China. Electronic address: 112201llcctv@scut.edu.cn.
³ Carbohydrate Laboratory, School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, PR China ⁠; Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, Guangzhou 510640, PR China. Electronic address: qygao@scut.edu.cn.

PMID: 37182958
DOI: 10.1016/j.carbpol.2023.120867

Abstract

Janus particles (J-OSPs) based on the composite of chitosan nanoparticles (CSNPs) and octadecenyl succinic anhydride starch (OSPs) were tailor-made by Pickering emulsion method and electrostatic interaction. With different positions of OSPs embedded in the oil phase of Pickering emulsion template and the diversified shapes of starch particles, J-OSPs exhibited various asymmetric structures, which was verified by scanning electron microscope (SEM) and confocal laser microscope (CLSM). By characterizing the interfacial characteristics of J-OSPs, directional distribution of CSNPs was found to enhance the hydrophobicity of J-OSPs and changed its surface charges from positive to negative as pH increased. When J-OSPs were taken as stabilizers, the formed Pickering emulsion had the highest emulsion index and viscosity compared with OSPs and OSPs fully covered by CSNPs (F-OSPs), which was attributed to the self-assembly property of Janus particles that enabled them to form larger aggregates to hinder the collapse of droplets. This study provides a new idea for the construction of plant-derived Janus particles, and its superiority in stabilizing the Pickering emulsion will broaden the application of Janus particles in the field of storage and delivery of active substances.

Keywords: Chitosan nanoparticles; Interfacial properties; Janus particles; Pickering emulsion; Starch.