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    Enhanced Interface Properties and Stability of Lignocellulose Nanocrystals Stabilized Pickering Emulsions: The Leading Role of Tannic Acid

    Year: 2021

    Journal: J. Agric. Food Chem., Volume 69, DEC 8, page 14650–14661

    Authors: Dai, Hongjie; Chen, Yuan; Zhang, Shumin; Feng, Xin; Cui, Bo; Ma, Liang; Zhang, Yuhao

    Organizations: National Natural Science Foundation of China [31901683, 31972102]; Natural Science Foundation of Chongqing, China [cstc2020jcyj-msxmX0087]; Foundation of State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences [KF201923]; Chongqing Young Eagle Project of China [CY210202]

    Keywords: lignocellulose nanocrystals; tannic acid; Pickering emulsions; stabilization

    Cellulose and tannin are both abundant and biodegradable biopolymers, whose integrations show great potential in the food field due to their nutritional properties and biological activity. Here, lignocellulose nanocrystals (LCNC) isolated from pineapple peel were complexed with tannic acid (TA) through hydrogen-bonding interaction to prepare the LCNC/TA complex for stabilizing Pickering emulsions. Introducing TA decreased the interfacial tension (23.8-20.1 mN/m) and water contact angle (83.2-56.2 degrees) with the LCNC/TA ratio ranging from 1:0 to 1:0.8 (w/w) but increased the size of the LCNC/TA complex. The droplet size of emulsions decreased from 115.0 to 51.3 mu m accompanied by improved rheological properties. The emulsions stabilized by the LCNC/TA complex exhibited higher storage and environmental stabilities than those stabilized by LCNC alone. Interestingly, TA effectively promoted the interfacial adsorption of LCNC to build a stronger interfacial layer. The emulsion network structure was enhanced due to the formation of hydrogen-bonding interaction between LCNC and TA in the continuous phase.
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