Lignin–Quercetin Hybrid Colloidal Particles as Sustainable Pickering Emulsifiers: A Bio-Based and Functional Approach

Oliveira, Barbara Miqueletti de; Colucci, Giovana; Schreiner, Tatiana B.; Preegel, Gert; Silva, Lucimara Lopes da; Santamaria-Echart, Arantzazu; Barreiro, Filomena

http://hdl.handle.net/10198/36379

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Autores

Oliveira, Barbara Miqueletti de

Colucci, Giovana

Schreiner, Tatiana B.

Preegel, Gert

Silva, Lucimara Lopes da

Santamaria-Echart, Arantzazu

Barreiro, Filomena

Resumo(s)

Lignin, the second-most-abundant polymer on Earth, has attracted attention for its value-added applications. Colloidal lignin particles can overcome handling and compatibility issues, offer antioxidant, antimicrobial, and UV-protective properties, and serve as Pickering stabilizers. Plant extracts rich in bioactive compounds, such as polyphenols and flavonoids (e.g., quercetin), can further enhance lignin-based formulations. In this context, colloidal lignin–quercetin particles (CLQPs) were produced for the first time via antisolvent precipitation and used as Pickering emulsion stabilizers. CLQP dispersions (30 g/L) were prepared by solubilizing lignin and quercetin in 80% (v/v) aqueous acetone solution, followed by precipitation with a pH 8 buffer. A quercetin content of 50% (w/w) (CLQP-50) resulted in predominantly round-shaped lignin–quercetin particles (<1 µm) with a small fraction of quercetin crystals. Both structures contributed to emulsion stabilization, as evidenced by confocal microscopy, a three-phase contact angle of 91.6 ± 0.1°, and a zeta potential of −52.8 ± 2.7 mV. CLQP-50 successfully stabilized Pickering emulsions at a 60/40 oil/water ratio, showing high physical stability (stability index 0.01) and shear-thinning behavior with gel-like consistency. These findings demonstrate the pioneering development of lignin–quercetin hybrid colloidal particles as sustainable and functional Pickering stabilizers, opening new opportunities for advanced cosmetic and pharmaceutical formulations.

Palavras-chave

Lignin Colloidal lignin particles Quercetin Pickering emulsions

URI

http://hdl.handle.net/10198/36379

Citação

Oliveira, Barbara Miqueletti de; Colucci, Giovana; Schreiner, Tatiana B.; Preegel, Gert; Silva, Lucimara Lopes da; Santamaria-Echart, Arantzazu; Barreiro, Maria-Filomena (2026). Lignin–Quercetin Hybrid Colloidal Particles as Sustainable Pickering Emulsifiers: A Bio-Based and Functional Approach. Molecules. ISSN 1420-3049. 31:5, 1-18