| Texto completo | |
| Autor(es): |
Dias Meirelles, Aureliano Agostinho
[1]
;
Rodrigues Costa, Ana Leticia
[2]
;
Cunha, Rosiane Lopes
[1]
Número total de Autores: 3
|
| Afiliação do(s) autor(es): | [1] Univ Estadual Campinas, Sch Food Engn, Dept Food Engn, BR-13083862 Campinas, SP - Brazil
[2] Univ Estadual Campinas, Sch Chem Engn, Dept Mat & Bioproc Engn, BR-13083852 Campinas, SP - Brazil
Número total de Afiliações: 2
|
| Tipo de documento: | Artigo Científico |
| Fonte: | International Journal of Biological Macromolecules; v. 158, p. 75-84, SEP 1 2020. |
| Citações Web of Science: | 3 |
| Resumo | |
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. (C) 2020 Elsevier B.V. All rights reserved. (AU) | |
| Processo FAPESP: | 07/58017-5 - Micro e nano emulsoes alimenticias: estudo reo-optico e de estabilidade. |
| Beneficiário: | Rosiane Lopes da Cunha |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 11/06083-0 - Emulsificação por microcanais |
| Beneficiário: | Rosiane Lopes da Cunha |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |