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Polymers
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Integrated Efforts for the Valorization of Sweet Potato By-Products within a Circular Economy Concept: Biocomposites for Packaging Applications Close the Loop

Authors: Micaela Vannini; Paola Marchese; Laura Sisti; Andrea Saccani; Taihua Mu; Hongnan Sun; Annamaria Celli;

Integrated Efforts for the Valorization of Sweet Potato By-Products within a Circular Economy Concept: Biocomposites for Packaging Applications Close the Loop

Abstract

With the aim to fully exploit the by-products obtained after the industrial extraction of starch from sweet potatoes, a cascading approach was developed to extract high-value molecules, such as proteins and pectins, and to valorize the solid fraction, rich in starch and fibrous components. This fraction was used to prepare new biocomposites designed for food packaging applications. The sweet potato residue was added to poly(3-hydroxybutyrate-co-3-hydroxyvalerate) in various amounts up to 40 wt % by melt mixing, without any previous treatment. The composites are semicrystalline materials, characterized by thermal stability up to 260 °C. For the composites containing up to 10 wt % of residue, the tensile strength remains over 30 MPa and the strain stays over 3.2%. A homogeneous dispersion of the sweet potato waste into the bio-polymeric matrix was achieved but, despite the presence of hydrogen bond interactions between the components, a poor interfacial adhesion was detected. Considering the significant percentage of sweet potato waste used, the biocomposites obtained show a low economic and environmental impact, resulting in an interesting bio-alternative to the materials commonly used in the packaging industry. Thus, according to the principles of a circular economy, the preparation of the biocomposites closes the loop of the complete valorization of sweet potato products and by-products.

Country
Italy
Subjects by Vocabulary

Microsoft Academic Graph classification: Materials science Starch Fraction (chemistry) Crystallinity chemistry.chemical_compound Ultimate tensile strength Thermal stability Residue (complex analysis) Extraction (chemistry) Food packaging chemistry Chemical engineering

Library of Congress Subject Headings: lcsh:QD241-441 lcsh:Organic chemistry

Keywords

bio-based polymers, Polymers and Plastics, Sweet potato residues, Article, Bio-based polymer, biocomposites, General Chemistry, natural fillers, Natural filler, Sustainability, Biocomposite

70 references, page 1 of 7

1. Circular Economy-UK, USA, Europe, Asia & South America-The Ellen MacArthur Foundation. Available online: www. ellenmacarthurfoundation.org (accessed on 26 February 2021).

2. United Nations Environment Programme (UNEP)-Converting Waste Agricultural Biomass into a Resource. United Nations Environment Programme Division of Technology, Industry and Economics International Environmental Technology Centre, Osaka/Shiga, Japan. 2009. Available online: https://wedocs.unep.org/bitstream/handle/20.500.11822/7614/ WasteAgriculturalBiomassEST_Compendium.pdf (accessed on 9 March 2021).

3. Teigiserova, D.A.; Hamelin, L.; Thomsen, M. Review of high-value food waste and food residues biorefineries with focus on unavoidable wastes from processing. Resour. Conserv. Recy. 2019, 149, 413-426. [CrossRef] [OpenAIRE]

4. Fritsch, C.; Staebler, A.; Happel, A.; Marquez, M.A.C.; Aguilo-Aguayo, I.; Abadias, M.; Gallur, M.; Cigognini, I.M.; Montanari, A.; Lopez, M.J.; et al. Processing, Valorization and Application of Bio-Waste Derived Compounds from Potato, Tomato, Olive and Cereals: A Review. Sustainability 2017, 9, 1492. [CrossRef]

5. Torres, M.D.; Dominguez, H. Valorisation of potato wastes. Int. J. Food Sci. Technol. 2020, 55, 2296-2304. [CrossRef]

6. Tassoni, A.; Tedeschi, T.; Zurlini, C.; Cigognini, I.M.; Petrusan, J.I.; Rodriguez, O.; Neri, S.; Celli, A.; Sisti, L.; Cinelli, P.; et al. State-of-the-Art Production Chains for Peas, Beans and Chickpeas-Valorization of Agro-Industrial Residues and Applications of Derived Extracts. Molecules 2020, 25, 1383. [CrossRef] [OpenAIRE]

7. Totaro, G.; Sisti, L.; Vannini, M.; Marchese, P.; Tassoni, A.; Lenucci, M.S.; Lamborghini, M.; Kalia, S.; Celli, A. A new route of valorization of rice endosperm by-product: Production of polymeric biocomposites. Compos. B Eng. 2018, 139, 195-202. [CrossRef]

8. Ricciardi, P.; Cillari, G.; Miino, M.C.; Collivignarelli, M.C. Valorization of agro-industry residues in the building and environmental sector: A review. Waste Manag. Res. 2020, 38, 487-513. [CrossRef] [OpenAIRE]

9. FAO STAT. Statistical Database. 2019. Available online: www.fao.org (accessed on 26 February 2021).

10. Mei, X.; Mu, T.H.; Han, J.J. Composition and Physicochemical Properties of Dietary Fiber Extracted from Residues of 10 Varieties of Sweet Potato by a Sieving Method. J. Agric. Food Chem. 2010, 58, 7305-7310. [CrossRef]

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  • citations
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Top 10%
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Top 10%
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
10
Top 10%
Average
Top 10%
Green
gold
Funded by
EC| NoAW
Project
NoAW
Innovative approaches to turn agricultural waste into ecological and economic assets
  • Funder: European Commission (EC)
  • Project Code: 688338
  • Funding stream: H2020 | RIA
Validated by funder
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