Please use this identifier to cite or link to this item: http://hdl.handle.net/1843/40942
Type: Artigo de Periódico
Title: Cellulose nanocrystals from ultrasound process stabilizing O/W Pickering emulsion
Authors: Aureliano Agostinho Dias Meirelles
Ana Letícia Rodrigues Costa Lelis
Rosiane Lopes Cunha
Abstract: Cellulose nanocrystals (CNC) are bio-based solid particles arisen as promising stabilizers for Pickering emulsions in food, pharmaceutical and cosmetics industries. This study aimed to understand the stabilization mechanism of oil-in-water emulsion using CNC as stabilizing particles. CNC were obtained from cellulose microcrystalline after acid hydrolysis, dialysis, ultrasound treatment and vacuum filtration. Atomic force microscopy (AFM) showed needle-shaped CNC. The CNC presented good stability against agglomeration due to the high electrostatic repulsion between particles, making them feasible to be used in O/W emulsions. O/W emulsions were stabilized by CNC and prepared using rotor-stator and ultrasound as mechanical processes. Emulsions stabilized by CNC were opaque, homogeneous and kinetically stable during few days. Small droplets generated during the ultrasound process, could be covered by cellulose nanoparticles that acted as an effective mechanical barrier against droplets coalescence in a Pickering mechanism. The mechanism of droplets stabilization was associated with electrostatic and steric repulsion between droplets. Emulsions were evaluated varying the proportion between flaxseed oil and cellulose nanocrystals (CNC). Emulsions with a lower proportion of CNC showed better kinetic stability compared to emulsions with higher CNC proportion. After 7 days of storage, the viscosity of emulsions with a higher proportion of CNC particles decreased, which was associated to the emulsion destabilization. Our results improved the understanding of the relationship between the proportions of oil and particles for emulsion properties by evaluating the potential application of CNC as a food emulsifier.
Subject: Nanocristais
Celulose
language: eng
metadata.dc.publisher.country: Brasil
Publisher: Universidade Federal de Minas Gerais
Publisher Initials: UFMG
metadata.dc.publisher.department: FAR - DEPARTAMENTO DE ALIMENTOS
Rights: Acesso Aberto
metadata.dc.identifier.doi: 10.1016/j.ijbiomac.2020.04.185
URI: http://hdl.handle.net/1843/40942
Issue Date: Sep-2020
metadata.dc.url.externa: https://www.sciencedirect.com/science/article/pii/S0141813020330464
metadata.dc.relation.ispartof: International Journal of Biological Macromolecules
Appears in Collections:Artigo de Periódico

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