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A solvent-free approach for production of films from pectin and fungal biomass
Högskolan i Borås, Akademin för textil, teknik och ekonomi.ORCID-id: 0000-0002-1711-7294
Högskolan i Borås, Akademin för textil, teknik och ekonomi.ORCID-id: 0000-0003-4887-2433
Högskolan i Borås, Akademin för textil, teknik och ekonomi.
2018 (Engelska)Ingår i: Journal of polymers and the environment, ISSN 1064-7546, E-ISSN 1572-8900, Vol. 26, nr 11, s. 4282-4292Artikel i tidskrift (Refereegranskat) Published
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Abstract [en]

Self-binding ability of the pectin molecules was used to produce pectin films using the compression molding technique, as an alternative method to the high energy-demanding and solvent-using casting technique. Moreover, incorporation of fungal biomass and its effects on the properties of the films was studied. Pectin powder plasticized with 30% glycerol was subjected to heat compression molding (120 °C, 1.33 MPa, 10 min) yielding pectin films with tensile strength and elongation at break of 15.7 MPa and 5.5%, respectively. The filamentous fungus Rhizopus oryzae was cultivated using the water-soluble nutrients obtained from citrus waste and yielded a biomass containing 31% proteins and 20% lipids. Comparatively, the same strain was cultivated in a semi-synthetic medium resulting in a biomass with higher protein (60%) and lower lipid content (10%). SEM images showed addition of biomass yielded films with less debris compared to the pectin films. Incorporation of the low protein content biomass up to 15% did not significantly reduce the mechanical strength of the pectin films. In contrast, addition of protein-rich biomass (up to 20%) enhanced the tensile strength of the films (16.1–19.3 MPa). Lastly, the fungal biomass reduced the water vapor permeability of the pectin films.

Ort, förlag, år, upplaga, sidor
2018. Vol. 26, nr 11, s. 4282-4292
Nyckelord [en]
Citrus waste, Pectin, Compression molding, Rhizopus oryzae, Bioplastics
Nationell ämneskategori
Industriell bioteknik
Forskningsämne
Resursåtervinning
Identifikatorer
URN: urn:nbn:se:hb:diva-15055DOI: 10.1007/s10924-018-1300-xISI: 000446743000011Scopus ID: 2-s2.0-85052708199OAI: oai:DiVA.org:hb-15055DiVA, id: diva2:1243131
Tillgänglig från: 2018-08-30 Skapad: 2018-08-30 Senast uppdaterad: 2018-11-30Bibliografiskt granskad
Ingår i avhandling
1. Fungi-based biorefinery model for food industry waste: progress toward a circular economy
Öppna denna publikation i ny flik eller fönster >>Fungi-based biorefinery model for food industry waste: progress toward a circular economy
2018 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

The food industry, one of the most important industrial sectors worldwide, generates large amounts of biodegradable waste with high organic load. In recent years, the traditional management methods to treat this waste (e.g., landfilling) have been considered not suitable because they do not exploit the potential of the waste material. Alternatively, valorization of food industry waste via a biorefinery model using filamentous fungi is considered to represent an attractive strategy because it minimizes the negative impacts while recovering the nutrients and energy of the waste, in accordance with the concept of the circular economy.

In this thesis, four food processing wastes were utilized as case studies: potato protein liquor (PPL, the soluble fraction of potato starch production waste), the peels wasted during orange juice production, the starchy byproduct of pea protein processes, and the wastewater of a wheat-starch plant. Rhizopus oryzae, a zygomycetous filamentous fungus, was grown with these wastes as a substrate, yielding biomass containing 43% (w/w) protein together with 51% removal of the chemical oxygen demand when cultivated in tenfold-diluted PPL. Moreover, protein-rich biomass was produced using the pea-processing byproduct (55%) and wheat-starch wastewater (51%). In contrast, cultivation in orange peel extract yielded a biomass rich in lipids (20%). The use of PPL was also studied in terms of the economy of fungal cultivation. The biotreatment was found to require only 46% of the capital investment necessary for treating PPL by the traditional strategy (application as fertilizer). In comparison, the ascomycetous fungus Aspergillus oryzae yielded superior results compared to those of R. oryzae when grown in the starchy residues. The high protein content of the fungal biomass encouraged the investigation of its use for bioplastic production. The addition of 20% fungal biomass in a pectin matrix increased the tensile yield of the film and reduced the elongation at break. Moreover, a positive effect on water vapor permeability of the film was also observed.

These results indicate the ability of the filamentous fungi to convert resources wasted by the food industry into new products with positive impacts on the economy and the environment.

Ort, förlag, år, upplaga, sidor
Borås: Högskolan i Borås, 2018
Serie
Skrifter från Högskolan i Borås, ISSN 0280-381X ; 89
Nyckelord
filamentous fungi, circular economy, biorefinery, food industry, fungal biomass, bioplastic, resource recovery
Nationell ämneskategori
Annan industriell bioteknik
Forskningsämne
Resursåtervinning
Identifikatorer
urn:nbn:se:hb:diva-14888 (URN)978-91-88838-00-1 (ISBN)978-91-88838-01-8 (ISBN)
Disputation
2018-09-25, 310, University of Borås, Allégatan 1, Borås, 10:00 (Engelska)
Opponent
Tillgänglig från: 2018-08-30 Skapad: 2018-08-07 Senast uppdaterad: 2018-11-26Bibliografiskt granskad

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