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Open AccessArticle
Enrichment of Fruit Peels’ Nutritional Value by Solid-State Fermentation with Aspergillus ibericus and Rhizopus oryzae
by
Liliana P. Araújo
Liliana P. Araújo 1,†,
Helena Vilela
Helena Vilela 1,†,
Joana Solinho
Joana Solinho 2,
Rita Pinheiro
Rita Pinheiro 2
,
Isabel Belo
Isabel Belo 1,3 and
Marlene Lopes
Marlene Lopes 1,3,*
1
CEB–Centre of Biological Engineering, Campus de Gualtar, University of Minho, 4710-057 Braga, Portugal
2
Center for Research and Development in Agrifood Systems and Sustainability, Polytechnic Institute of Viana do Castelo, Avenida Atlântico, 4900-348 Viana do Castelo, Portugal
3
LABBELS–Associate Laboratory, Braga/Guimarães, 4710-057 Braga, Portugal
*
Author to whom correspondence should be addressed.
†
These authors contributed equally to the work.
Molecules 2024, 29(15), 3563; https://doi.org/10.3390/molecules29153563 (registering DOI)
Submission received: 10 July 2024
/
Revised: 23 July 2024
/
Accepted: 26 July 2024
/
Published: 28 July 2024
Abstract
The fruit processing industry is responsible for disposing of huge amounts of byproducts, especially fruit peels (FPs), which are often discarded in landfills. Using FPs in biotechnological processes contributes to a circular economy, reducing the environmental burden of FPs and increasing the revenue of the fruit processing industry. This study was focused on upgrading the nutritional value of orange (OPs) and banana (BPs) peels by solid-state fermentation (SSF) with filamentous fungi. SSF factors (moisture, fermentation time, inoculum size, ammonium sulfate (AS), and corn steep liquor (CSL)) and fungi species (Aspergillus ibericus and Rhizopus oryzae) were studied by a variable screening Plackett–Burman design. Both fungi grew on untreated FPs, increasing their protein content and antioxidant activity. Moisture, AS, and CSL were further studied by a Box–Behnken design with A. ibericus. Fermented OPs at 70% moisture and 0.005 g/g AS increased their protein content by 200%, whereas BPs at 70% moisture and 0.005 g/g CSL increased by 123%. Fermented peels were enriched in protein, fiber, and minerals, with a low content of carbohydrates and soluble sugars. Fermented OPs and BPs showed higher antioxidant activity than unfermented peels. The SSF of these FPs is an innovative approach that contributes to obtaining rich nutrient-fermented peels for food.
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MDPI and ACS Style
Araújo, L.P.; Vilela, H.; Solinho, J.; Pinheiro, R.; Belo, I.; Lopes, M.
Enrichment of Fruit Peels’ Nutritional Value by Solid-State Fermentation with Aspergillus ibericus and Rhizopus oryzae. Molecules 2024, 29, 3563.
https://doi.org/10.3390/molecules29153563
AMA Style
Araújo LP, Vilela H, Solinho J, Pinheiro R, Belo I, Lopes M.
Enrichment of Fruit Peels’ Nutritional Value by Solid-State Fermentation with Aspergillus ibericus and Rhizopus oryzae. Molecules. 2024; 29(15):3563.
https://doi.org/10.3390/molecules29153563
Chicago/Turabian Style
Araújo, Liliana P., Helena Vilela, Joana Solinho, Rita Pinheiro, Isabel Belo, and Marlene Lopes.
2024. "Enrichment of Fruit Peels’ Nutritional Value by Solid-State Fermentation with Aspergillus ibericus and Rhizopus oryzae" Molecules 29, no. 15: 3563.
https://doi.org/10.3390/molecules29153563
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