Title Influence of Type and Concentration of Biopolymer on ß-Carotene Encapsulation Efficiency in Nanoemulsions Based on Linseed Oil
Authors SANTOS GARCÍA, JENIFER, Trujillo-Cayado L.A. , Barquero M. , Calero N.
External publication No
Means Polym.
Scope Article
Nature Científica
JCR Quartile 1
SJR Quartile 1
JCR Impact 5.00000
SJR Impact 0.72000
Web https://www.scopus.com/inward/record.uri?eid=2-s2.0-85141840822&doi=10.3390%2fpolym14214640&partnerID=40&md5=352e70336c08165a5587bed6960755e8
Publication date 31/10/2022
ISI 000881480900001
Scopus Id 2-s2.0-85141840822
DOI 10.3390/polym14214640
Abstract Many lipophilic active substances, such as ß-carotene, are sensitive to chemical oxidation. A strategy to protect these ingredients is encapsulation using nanoemulsions. This work analyzes the relationship between the physical stability and encapsulation efficiency of nanoemulsions based on linseed oil. The role of two different polysaccharides, Advanced Performance xanthan gum (APXG) or guar gum (GG) as stabilizers at different concentrations were studied to reach the required physical stability of these systems. This was investigated by means of droplet size distributions, steady-state flow curves, small amplitude oscillatory shear tests, multiple light scattering, and electronic microscopy. The overall results obtained reveal a depletion flocculation mechanism in all the APXG nanoemulsions, regardless of the concentration, and above 0.3 wt.% for GG nanoemulsions. Moreover, it has been demonstrated that enhanced physical stability is directly related to higher values of encapsulation efficiency. Thus, the nanoemulsion formulated with 0.2 wt.% GG, which presented the lowest creaming degree conditioned by depletion flocculation, showed a relative ß-carotene concentration even above 80% at 21 days of aging time. In conclusion, the adequate selection of polysaccharide type and its concentration is a key point for the application of stable nanoemulsions as vehicles for active ingredients. © 2022 by the authors.
Keywords Biopolymers; Efficiency; Flocculation; Oilseeds; Ostwald ripening; Shear flow; Xanthan gum; Active substance; Advanced performance xanthan gum; Depletion flocculation; Encapsulation efficiency; Guar g
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