Journal
BIORESOURCE TECHNOLOGY
Volume 342, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.125981
Keywords
Autohydrolysis; Avocado peel; Oligosaccharides; Antioxidant phenolics; Biorefinery
Funding
- University of Vigo
- CISUG
- Xunta de Galicia [GRC ED431C 2017/62-GRC, ED431F 2020/03]
- FEDER Program of the European Union (Unha maneira de facer Europa)
- Spanish Ministry of Science, Innovation and Universities [RYC2018-026177-I, RYC2018-024846-I]
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Autohydrolysis of Avocado peel can recover oligosaccharides and polyphenolics, which have potential applications in the food and cosmetic industries. Various compounds, including flavonoids and phenolic acids, were identified in the extracted liquor, demonstrating the suitability of this technology for obtaining bioactive agents.
Avocado industrial processing generates huge quantities of residues that are currently wasted without any valuable commercial application. This work deals with autohydrolysis of Avocado peel (AP) for the concomitant recovery of oligosaccharides and polyphenolics. Temperature of 150 degrees C allowed the highest recovery of oligosaccharides (14.3 g oligosaccharides/100 g AP) and high recovery of antioxidant phenolics (3.48 g gallic acid equivalents/100 g AP and 10.80 g Trolox equivalents/100 g AP measured with ABTS(center dot+) assay). The liquor obtained at this temperature was characterized by TGA and FTIR to study its thermal stability and functional groups. UHPLC-TOF MS analysis of an ethyl acetate extract of AP liquor enabled the tentative identification of 43 compounds, belonging to various metabolite families, including flavonoids, phenolic acids, organic acids, lignans and fatty acids. These findings demonstrated that autohydrolysis of AP is a suitable technology to obtain bioactive agents with potential uses in food and cosmetic industries.
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