resumo
Samples with different contents of ellagic acid (EA) (55-94 %), isolated from sulphite spent liquor (SSL) of acid sulphite pulping of Eucalyptus wood, were examined for their antioxidant (AOX) activity towards the stable free 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical and compared with several natural and synthetic antioxidants. Using a spectrophotometric approach with stoichiometric and kinetic parameters, AOX potentials were ordered as follows: EA > pyrogallol > caffeic acid approximate to Trolox > > butylated hydroxytoluene. Although the AOX activity in EA formulations was mainly attributed to EA, the contribution of concomitant lignin was not negligible. The importance of prior purification of EA formulations for enhanced AOX properties was highlighted. No significant synergistic or antagonistic effects of concomitants on the AOX activity of EA were detected. EA was suggested to be a prominent natural alternative to synthetic AOX for food applications and polymer matrices in food packaging, being a potentially safe solution for health and environment.
palavras-chave
RADICAL SCAVENGING ACTIVITY; ASSAY; STABILIZERS; CAPACITY
categoria
Biotechnology & Applied Microbiology; Engineering; Food Science & Technology
autores
Evtyugin, DD; Evtuguin, DV
nossos autores
Dmitry Dmitrievitch Evtyugin
Bolseiro de pós-Doutoramento
Dmitry Evtyugin
Professor Associado com Agregaçãoagradecimentos
This work was developed within the scope of the R&D project be-tween the University of Aveiro and CAIMA-Cellulose Company, S.A. and supported by CICECO-Aveiro Institute of Materials, FCT Ref. UIDB/50011/2020 & UIDP/50011/2020, financed by national funds through the Portuguese Foundation for Science and Technology (FCT) /MCTES.