Comparison of Extraction Techniques for the Recovery of Sugars, Antioxidant and Antimicrobial Compounds from Agro-Industrial Wastes

Leticia Casas-Godoy, Amador Roberto Campos-Valdez, Montserrat Alcázar-Valle and Iliana Barrera-Martínez
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Leticia Casas-Godoy: CONACYT—Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco A.C., Biotecnología Industrial, Av. Normalistas No. 800, Colinas de la Normal, C.P, Guadalajara 44270, Jalisco, Mexico
Amador Roberto Campos-Valdez: Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco A.C., Biotecnología Industrial, Av. Normalistas No. 800, Colinas de la Normal, C.P, Guadalajara 44270, Jalisco, Mexico
Montserrat Alcázar-Valle: Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco A.C., Biotecnología Industrial, Av. Normalistas No. 800, Colinas de la Normal, C.P, Guadalajara 44270, Jalisco, Mexico
Iliana Barrera-Martínez: CONACYT—Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco A.C., Biotecnología Industrial, Av. Normalistas No. 800, Colinas de la Normal, C.P, Guadalajara 44270, Jalisco, Mexico

Sustainability, 2022, vol. 14, issue 10, 1-17

Abstract: Agro-industrial wastes can be used to obtain high-value compounds rich in antioxidant and antimicrobial activity. This study aimed to compare different extraction techniques for the recovery of sugars, antioxidants, and antimicrobial compounds from brewer’s spent grain (BSG), blue agave bagasse (BAB), spoiled blackberries (BB), and raspberries (RB). Aqueous (AQ), enzymatic (E), chemical-enzymatic (CE), and hydroalcoholic (EOH) extractions were assessed, and sugars, phenolics, flavonoids, and anthocyanin contents were quantified. Antioxidant activity of the extracts was evaluated using the ABTS and DPPH assays, and antimicrobial activity was tested against three yeasts and six bacteria. The CE process gave the highest total and reducing sugars content for the four residues tested, and the highest antioxidant activity, phenolics, flavonoids and anthocyanin content for BAB and BSG. Regarding BB and RB, the best treatment to obtain total and reducing sugars and antioxidant activity with ABTS was CE; the highest content of anthocyanins, phenolic, flavonoids and antioxidant activity with DPPH was obtained with EOH treatment. CE extracts of BSG and RB showed the highest inhibition against the strains studied. Results show that BSG, BB, and RB can be a source of antioxidants and antimicrobial compounds for the food and pharmaceutical industries. Depending on the desired application and component of interest, one of the extraction techniques evaluated here could be used.

Keywords: brewer’s spent grain; blue agave bagasse; berries; extracts; hydrolysates (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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