Abstract
Brewers’ spent grain is an important source of non-starch polysaccharides, such as arabinoxylans. In this paper, a fraction rich in arabinoxylans was extracted from brewers’ spent grain (BSG-AX) by alkaline medium; was characterized by FTIR spectroscopy, scanning electronic microscopy (SEM), and zeta potential; and was used to prepare fourteen thermoplastic films by addition of two plasticizers (glycerol and polypropylene glycol) and a defoamer agent (coconut oil). All films were characterized by FTIR spectroscopy, SEM, and thermogravimetric analysis (TGA). Activation energy (Ea) of the thermal film’s degradation were determined using four models (Broido, Horowitz-Metzger, Coats-Redfern, and Kissigner-Akahira-Sunose), which provide overall kinetic data. Likewise, microbiological analysis of films was performed for assessing their safety. FTIR spectra of BSG-AX films confirm the presence of distinctive functional groups for arabinoxylan, whereas their morphology shows a homogeneous surface structure. Zeta-potential measures suggest that BSG-AX can be considered as a neutral polysaccharide between pH 3 to 10 (values from − 3.44 to − 9.17 mV). Two stages of mass loss were observed in the plasticized films and three for the control (at 113–174 °C, 215–350 °C, and 487–598 °C). The addition of the plasticizer and defoamer agents increases the Ea of the films; namely, the films show greater thermal stability. Besides, the microbiological analysis suggests that the BSG-AX films are safe (absence of total coliforms and 102 CFU g−1 of aerobic mesophylls). In conclusion, plasticized films prepared with BSG-AX have characteristics such as resistance to a wide range of temperatures and can be used as packaging materials.
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Acknowledgements
Y. J. H. acknowledges CONACyT, Mexico, for their support through a PhD fellowship. C. T. I., K. A. A., L. G. G. O., N. C. C., D. O. R., and A. C. O.; we also thank Sistema Nacional de Investigadores for the stipend received.
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This research was funded by the Consejo Nacional de Ciencia y Tecnología, Mexico (project number CB-2013–220163).
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Conceptualization, A.C.O.; methodology, Y.J.H., C.T.I., E.P.C.O.; investigation, Y.J.H., K.A.A.; analysis of results, L.G.G.O., A.C.O., E.P.C.O.; writing—original draft preparation, A.C.O., D.O.J.; writing—review and editing, L.G.G.O., N.C.C.
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Statement of novelty
The inadequate treatment of food industry by-products can cause a negative environmental impact. The brewers’ spent grain (BGS) is the main by-product of the brewing industry, which is obtained in large quantities and is an important source of polysaccharides (mainly arabinoxylans). This by-product was used to recover arabinoxylans (AXs), that can be considered as high-added-value compounds. Additionally, an arabinoxylan-rich fraction from BSG was used to prepare thermoplastic films. These materials were characterized and showed properties that can be favorable for their potential use as coating or packaging material. The ability of AXs to form films has been previously evaluated; however, this work constitutes an advance in the understanding of thermal stability and the effect of plasticizer addition.
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Jaguey-Hernández, Y., Tapia-Ignacio, C., Aguilar-Arteaga, K. et al. Thermoplastic biofilms obtained from an arabinoxylan-rich fraction from brewers’ spent grain: physicochemical characterization and thermal analysis. Biomass Conv. Bioref. 13, 14035–14047 (2023). https://doi.org/10.1007/s13399-021-02288-x
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DOI: https://doi.org/10.1007/s13399-021-02288-x