Stabilization of bluish pyranoanthocyanin pigments in aqueous systems Cheek for using lignin nanoparticles

• Type: Article in International Scientific Journal
• Date: 2019

Authors

Araujo, P (Author) Other; Fernandes, I (Author) Other; Nuno Mateus (Author) FCUP; De Freitas, V (Author) Other; Sarmento, B (Author) Other; Oliveira, J (Author) Other

Journal

Title: Dyes and Pigments

Vol. 166

Pages: 367-374

ISSN: 0143-7208

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 14 Citations

Scopus - 16 Citations

Other information

Authenticus ID: P-00Q-DT4

DOI: 10.1016/j.dyepig.2019.03.020

Abstract (EN): Lignin nanoparticles (LNP) loaded with pyranoanthocyanin dimers (PD) and portisins (P) were produced using nanoprecipitation and dialysis techniques. The results obtained for LNP and P-LNP showed particles presenting sizes around 200 nm with a very narrow size distribution (PDI <= 0.2) using both methods. For PD-LNP, the nanoprecipitation method yielded particles with high particle sizes (Z-average approximate to 800 nm) and PDI approximate to 0.45 when compared to the dialysis method that produced particles with an average size around 200 rim and a PDI below 0.2. Concerning the average zeta potential (zeta), values around - 40 mV were obtained for both methods. TEM, SEM and STEM images showed that the particles present a spherical and compact shape and that these characteristics were maintained for 28 days at room temperature. High encapsulation efficiencies of 86 +/- 2 and 85 +/- 4 were observed for PD and P, respectively. LNP stability was followed at pH >= 5 for at least 7 days and the LNP encapsulated systems (PD-LNP and P-LNP) showed a good colour stability towards pH change after 8 days of incubation, when compared with the pure bluish pigments.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8