A carregar...
Publicação
Circular Valorisation of Essential Oil Post-distillation by-products for Enhanced Xanthan Gum Bioproduction and Antimicrobial Treatments against Staphylococcus aureus
| Nome: | Descrição: | Tamanho: | Formato: | |
|---|---|---|---|---|
| 2.45 MB | Adobe PDF |
Orientador(es)
Resumo(s)
Essential oil (EO) post-distillation by-products, like hydrosols and wastewater, are sources of bioactive compounds. Aligned with the principles of the circular economy, these residues offer a cost-effective alternative for various applications. In this context, this study investigated xanthan gum (XG) biosynthesis by Xanthomonas campestris ATCC 33913 in a mineral salt medium supplemented with four hydrosols (Cupressus leylandii A.B. Jacks & Dallim, Eucalyptus globulus Labill., Aloysia citrodora Pal & aacute;u, and Melissa officinalis L.), achieving a 15.8% increase in production (13.91 g/L) when 10% C. leylandii hydrosol was used, compared to the control (12.01 g/L). The combination of this XG sample with a 50:50 (v/v) A. citrodora hydrosol and wastewater mixture yielded a product with a strong antioxidant capacity (90.2% free radical scavenging) and bacteriostatic effects against Staphylococcus aureus. Moreover, its antimicrobial capacity increased over time, likely due to the bacteria's extended exposure to the bioactive compounds found in both by-products. These interactions may compromise the integrity of the cell membrane, thereby enhancing compounds' penetration, reducing S. aureus by 48.3% in clean conditions (low organic load) and 40.6% in dirty conditions (high organic load) after 45 min, both of which were significantly different from the control (p < 0.0001). The developed product demonstrated antimicrobial activity against S. aureus biofilms, reducing them by 35.9% (p < 0.001) after 45 min of treatment. This effect was increased (56.8%; p < 0.0001) by doubling the treatment time (90 min). Repurposing EO by-products as novel ingredients provides antioxidant and antimicrobial benefits for innovative products targeting S. aureus and its biofilms.
Descrição
Palavras-chave
Xanthan gum Essential oil by-products Waste valorisation Hydrosols Antimicrobial activity Biobased solutions
Contexto Educativo
Citação
Almeida, Heloísa H.S.; Crugeira, Pedro; Santamaria-Echart, Arantzazu; Amaral, Joana S.; Finimundy, Tiane C.; Barros, Lillian; Rodrigues, Alírio E.; Barreiro, Filomena (2026). Circular Valorisation of Essential Oil Post-distillation by-products for Enhanced Xanthan Gum Bioproduction and Antimicrobial Treatments against Staphylococcus aureus. Waste and Biomass Valorization. ISSN 1877-2641. 17:6, p. 3073–3093
Editora
Springer