Antioxidant and Antimicrobial Characterization of Active Films Based on Yeast Biomass and Thymol

Yeast biomass is a novel source for the production of biodegradable films and, joint to the incorporation of certain compounds from essential oils, it is possible to design promising active materials for food preservation. In this work, thymol was incorporated into yeast biomass matrices to develop...

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Bibliographic Details
Published in:Food biophysics 2022-12, Vol.17 (4), p.473-483
Main Authors: Delgado, Juan F., Lopes, Florencia G., Peltzer, Mercedes A.
Format: Article
Language:English
Subjects:
Analytical Chemistry
Antiinfectives and antibacterials
Antimicrobial activity
Antimicrobial agents
Antioxidants
Biodegradability
Biodegradation
Biological and Medical Physics
Biomass
Biophysics
Chemistry
Chemistry and Materials Science
Diffusion
Diffusion coefficient
E coli
Essential oils
Food
Food preservation
Food Science
Infrared spectroscopy
Mechanical properties
Original Article
Phase separation
Polysaccharides
Saccharides
Thermal decomposition
Thymol
Yeast
Yeasts
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Summary:Yeast biomass is a novel source for the production of biodegradable films and, joint to the incorporation of certain compounds from essential oils, it is possible to design promising active materials for food preservation. In this work, thymol was incorporated into yeast biomass matrices to develop bioactive films and this compound was satisfactory, retained by them without phase separation. IR spectra showed that thymol interacted with proteins and polysaccharides, but thymol did not substantially modify the mechanical properties, colour, and thermal decomposition of films. The active compound provided great antioxidant and antimicrobial capacity to the films. The inhibition of the ABTS •+ radical was higher than 80% by the addition of 8 or 10 wt% of thymol. Release of thymol from films to fatty food simulants at 4 °C, 25 °C, and 40 °C was fitted by the Crank model and diffusion coefficients at 40 °C were one order of magnitude higher than diffusion coefficients at 4 °C. Regarding antimicrobial activity, 10 wt% satisfactorily inhibited the growth of E. coli . The promising antioxidant and antimicrobial capacity of the active yeast biomass-thymol films could be used in the protection of fatty foods.
ISSN:1557-1858
1557-1866
DOI:10.1007/s11483-022-09736-9