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Mohammadkhani, Ghasem
Publications (4 of 4) Show all publications
Mohammadkhani, G., Mahboubi, A., Plöhn, M., Funk, C. & Ylitervo, P. (2024). The potential of Nordic microalgae in nutrient removal from anaerobic digestion effluents. Physiologia Plantarum, 176(1)
Open this publication in new window or tab >>The potential of Nordic microalgae in nutrient removal from anaerobic digestion effluents
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2024 (English)In: Physiologia Plantarum, ISSN 0031-9317, E-ISSN 1399-3054, Vol. 176, no 1Article in journal (Refereed) Published
Abstract [en]

Anaerobic digestion is a promising method for organic waste treatment. While the obtained digestate can function as fertilizer, the liquid fraction produced is rather problematic to discharge due to its high nitrogen and chemical oxygen demand contents. Microalgae have great potential in sustainable nutrient removal from wastewater. This study aimed at evaluating native Swedish microalgae cultivation (batch operation mode, 25°C and continuous light of 80 μmol m−2 s−1) on anaerobic digestion effluent of pulp and paper sludge (PPS) or chicken manure (CKM) to remove ammonium and volatile fatty acids (VFAs). While algal strains, Chlorella vulgaris, Chlorococcum sp., Coelastrella sp., Scotiellopsis reticulata and Desmodesmus sp., could assimilate VFAs as carbon source, acetic acid was the most preferred. Higher algal biomass and cell densities were achieved using PPS compared to CKM. In PPS, Coelastrella sp. and Chlorella vulgaris reached the highest cell densities after 15 days, about 79 × 106 and 43 × 106 cells mL−1, respectively. Although in PPS, ammonium was completely assimilated (195 mg L−1), this was only 46% (172 mg L−1) in CKM. Coelastrella sp. produced the highest biomass concentration independently of the medium (1.84 g L−1 in PPS and 1.99 g L−1 in CKM). This strain is a promising candidate for nutrient removal and biomass production in the aforementioned media, followed by Chlorella vulgaris and Chlorococcum sp. They have great potential to reduce the environmental impact of industrial anaerobic digestion effluents in Nordic countries.

National Category
Other Industrial Biotechnology
Research subject
Resource Recovery; Resource Recovery
Identifiers
urn:nbn:se:hb:diva-31282 (URN)10.1111/ppl.14153 (DOI)001134340600001 ()2-s2.0-85181494300 (Scopus ID)
Funder
Swedish Research Council Formas, 2019‐00492
Note

The authors are thankful to ÅForsk (22-228) for the financial support of this project. The authors also are grateful to the Swedish Research Council FORMAS (2019-00492) to CF, Bio4Energy (www.bio4energy.se) to CF and Umeå University for their financial support.

Available from: 2024-01-11 Created: 2024-01-11 Last updated: 2024-02-01Bibliographically approved
Wijayarathna, E. K., Mohammadkhani, G., Moghadam, F. H., Berglund, L., Ferreira, J., Adolfsson, K. H., . . . Zamani, A. (2023). Tunable Fungal Monofilaments from Food Waste for Textile Applications. Global Challenges
Open this publication in new window or tab >>Tunable Fungal Monofilaments from Food Waste for Textile Applications
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2023 (English)In: Global Challenges, E-ISSN 2056-6646Article in journal (Refereed) Epub ahead of print
Abstract [en]

A fungal biorefinery is presented to valorize food waste to fungal monofilaments with tunable properties for different textile applications. Rhizopus delemar is successfully grown on bread waste and the fibrous cell wall is isolated. A spinnable hydrogel is produced from cell wall by protonation of amino groups of chitosan followed by homogenization and concentration. Fungal hydrogel is wet spun to form fungal monofilaments which underwent post-treatments to tune the properties. The highest tensile strength of untreated monofilaments is 65 MPa (and 4% elongation at break). The overall highest tensile strength of 140.9 MPa, is achieved by water post-treatment. Moreover, post-treatment with 3% glycerol resulted in the highest elongation % at break, i.e., 14%. The uniformity of the monofilaments also increased after the post-treatments. The obtained monofilaments are compared with commercial fibers using Ashby's plots and potential applications are discussed. The wet spun monofilaments are located in the category of natural fibers in Ashby's plots. After water and glycerol treatments, the properties shifted toward metals and elastomers, respectively. The compatibility of the monofilaments with human skin cells is supported by a biocompatibility assay. These findings demonstrate fungal monofilaments with tunable properties fitting a wide range of sustainable textiles applications. 

Place, publisher, year, edition, pages
John Wiley & Sons, 2023
National Category
Engineering and Technology Industrial Biotechnology Materials Engineering
Identifiers
urn:nbn:se:hb:diva-30531 (URN)10.1002/gch2.202300098 (DOI)001066479100001 ()2-s2.0-85171286785 (Scopus ID)
Funder
Vinnova, 2018–04093
Available from: 2023-09-21 Created: 2023-09-21 Last updated: 2024-02-01Bibliographically approved
Perrin, N., Mohammadkhani, G., Homayouni Moghadam, F., Delattre, C. & Zamani, A. (2022). Biocompatible fibers from fungal and shrimp chitosans for suture application. Current Research in Biotechnology, 4, 530-536
Open this publication in new window or tab >>Biocompatible fibers from fungal and shrimp chitosans for suture application
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2022 (English)In: Current Research in Biotechnology, ISSN 2590-2628, Vol. 4, p. 530-536Article in journal (Refereed) Published
Abstract [en]

Purified fungal chitosan and crustacean chitosan were wet spun by using adipic and lactic acids as solvent. The lowest viscosity at which fiber formation was possible was 0.5 Pa·s; below this value, aggregates from low molecular weight fungal chitosan (32 kDa) formed, which could not be collected and dried. Fiber formation was achieved with high molecular weight fungal (400 kDa) and shrimp (406.7 kDa) chitosans as well as low molecular weight shrimp chitosan (50–190 kDa). Fibers made of high molecular weight chitosans with adipic acid as the solvent generally exhibited higher tensile strength; the highest observed tensile strength and Young’s modulus were 308.0 ± 18.4 MPa and 22.7 ± 4.0 GPa, respectively. SEM images indicated the formation of cylindrical chitosan fibers. The survival (viability) of human skin fibroblasts in presence of different fibers was measured using tetrazolium-based colorimetric assay and results confirmed that chitosan fibers have better biocompatibility than common conventional sutures, regardless of the chitosan and acid type. Accordingly, chitosan fibers from fungal and shrimp sources serve as good candidates for application as sutures.

Keywords
Fungal chitosan, Shrimp chitosan, Wet spinning, Adipic acid, Lactic acid, Biocompatibility, Suture
National Category
Other Industrial Biotechnology
Research subject
Resource Recovery; Resource Recovery
Identifiers
urn:nbn:se:hb:diva-29290 (URN)10.1016/j.crbiot.2022.10.007 (DOI)000903554800006 ()2-s2.0-85140051762 (Scopus ID)
Funder
Vinnova, 2018-04093
Available from: 2023-01-13 Created: 2023-01-13 Last updated: 2023-01-16Bibliographically approved
Wijayarathna, E. K., Mohammadkhani, G., Mahboubi Soufiani, A., Adolfsson, K. H., Ferreira, J., Hakkarainen, M., . . . Zamani, A. (2021). Fungal textile alternatives from bread waste with leather-like properties. Resources, Conservation and Recycling, Article ID 106041.
Open this publication in new window or tab >>Fungal textile alternatives from bread waste with leather-like properties
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2021 (English)In: Resources, Conservation and Recycling, ISSN 0921-3449, E-ISSN 1879-0658, article id 106041Article in journal (Refereed) Published
Abstract [en]

Food waste and fashion pollution are two of the most prominent global environmental issues. To alleviate the problems associated with food waste, while simultaneously contributing to sustainable fashion, the feasibility of making an alternative textile material with leather-like properties from fungal biomass cultivated on bread waste was investigated. The filamentous fungus, Rhizopus delemar, was successfully grown on waste bread in a submerged cultivation process, and fungal biomass was treated with vegetable tannin of chestnut wood. NMR and FTIR confirmed interactions between tannin and fungal biomass, while OM, SEM and AFM visualised the changes in the hyphae upon the tannin treatment. Thermal stability was assessed using TGA analysis. The wet-laid technique commonly utilised for paper-making was used to prepare sheets of hyphae. Some of the sheets were treated with glycerol and/or a biobased binder as post-treatment. Overall, three of the produced materials exhibited leather-like properties comparable to that of natural leather. Sheets from untreated biomass with only glycerol post-treatment showed a tensile strength of 7.7 MPa and an elongation at break of 5%. Whereas sheets from untreated biomass and tannin treated biomass with both glycerol and binder treatments led to tensile strengths of 7.1 MPa and 6.9 MPa, and the elongation at break of 12% and 17%, respectively. The enhancement of hydrophobicity after the binder treatment, helped to preserve the absorbed glycerol within the sheet and thereby the flexibility was retained when in contact with moisture. These findings demonstrate that bread waste-derived fungal sheets have great potential as environmentally friendly materials with leather-like properties.

Place, publisher, year, edition, pages
Elsevier, 2021
Keywords
Fungal textiles, Food waste recovery, Filamentous fungi, Tanning, NMR, AFM, TGA
National Category
Polymer Chemistry Industrial Biotechnology
Research subject
Resource Recovery
Identifiers
urn:nbn:se:hb:diva-26958 (URN)10.1016/j.resconrec.2021.106041 (DOI)000774321500008 ()2-s2.0-85119499642 (Scopus ID)
Funder
Swedish Foundation for Strategic Research, Bio4EnergyVinnova, 2018–04093European Regional Development Fund (ERDF), TK134
Available from: 2021-11-30 Created: 2021-11-30 Last updated: 2022-09-14Bibliographically approved
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