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  • 1. Mousavi, Najmeh
    et al.
    Parchami, Mohsen
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Kumar Ramamoorthy, Sunil
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Mahboubi, Amir
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Hakkarainen, Minna
    Department of Fiber and Polymer Technology, KTH Royal Institute of Technology, 100 44 Stockholm, Sweden.
    Zamani, Akram
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Bioconversion of Carrot Pomace to Value-Added Products: Rhizopus delemar Fungal Biomass and Cellulose2023Ingår i: Fermentation, E-ISSN 2311-5637, Vol. 9, nr 4, artikel-id 374Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Carrot pomace (CP) which is generated in a large volume in the juice production process, is rich in cellulose, hemicellulose, sugars, pectin, and minerals. However, in many previous investigations, only cellulose was purified and utilized while other components of CP were discarded as waste. Here, CP was valorized into fungal biomass and cellulose with the aim of utilizing all the CP components. Enzymatic pretreatments were applied to solubilize the digestible fraction of CP including hemicellulose, pectin, sucrose, and other sugars for fungal cultivation, while cellulose remained intact in the solid fraction. The dissolved fraction was utilized as a substrate for the cultivation of an edible fungus (Rhizopus delemar). Fungal cultivation was performed in shake flasks and bench-scale bioreactors. The highest fungal biomass concentration was obtained after pretreatment with invertase (5.01 g/L) after 72 h of cultivation (36 and 42% higher than the concentrations obtained after hemicellulase and pectinase treatments, respectively). Invertase pretreatment resulted in the hydrolysis of sucrose, which could then be taken up by the fungus. Carbohydrate analysis showed 28–33% glucan, 4.1–4.9% other polysaccharides, 0.01% lignin, and 2.7–7% ash in the CP residues after enzymatic pretreatment. Fourier transform infrared spectroscopy and thermogravimetric analysis also confirmed the presence of cellulose in this fraction. The obtained fungal biomass has a high potential for food or feed applications, or as a raw material for the development of biomaterials. Cellulose could be purified from the solid fraction and used for applications such as biobased-textiles or membranes for wastewater treatment, where pure cellulose is needed.

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  • 2.
    Mousavi, Seyedeh Najmeh
    et al.
    Högskolan i Borås, Akademin för textil, teknik och ekonomi. Department of Wood and Paper Science, Faculty of Natural Resources, Sari Agriculture Science and Natural Resources University, P.O. Box 578, Sari 4818168984, Iran.
    Nazarnezhad, N.
    Department of Wood and Paper Science, Faculty of Natural Resources, Sari Agriculture Science and Natural Resources University, P.O. Box 578, Sari 4818168984, Iran.
    Asadpour, G.
    Department of Wood and Paper Science, Faculty of Natural Resources, Sari Agriculture Science and Natural Resources University, P.O. Box 578, Sari 4818168984, Iran.
    Kumar Ramamoorthy, Sunil
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Zamani, Akram
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Ultrafine friction grinding of lignin for development of starch biocomposite films2021Ingår i: Polymers, E-ISSN 2073-4360, Vol. 13, nr 12, artikel-id 2024Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The work demonstrates the utilization of fractionalized lignin from the black liquor of soda pulping for the development of starch-lignin biocomposites. The effect of ultrafine friction grinding on lignin particle size and properties of the biocomposites was investigated. Microscopic analysis and membrane filtration confirmed the reduction of lignin particle sizes down to micro and nanoparticles during the grinding process. Field Emission Scanning Electron Microscopy confirmed the compatibility between lignin particles and starch in the composites. The composite films were characterized for chemical structure, ultraviolet blocking, mechanical, and thermal properties. Additional grinding steps led to the reduction of large lignin particles and the produced particles were uniform. The formation of 7.7 to 11.3% lignin nanoparticles was confirmed in the two steps of membrane filtration. The highest tensile strain of the biocomposite films were 5.09 MPa, which displays a 40% improvement compared to starch films. Further, thermal stability of the composite films was better than that of starch films. The results from ultraviolet transmission showed that the composite films could act as an ultraviolet barrier in packaging applications. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

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