| Title |
Valorization of wheat milling by-products into bacterial nanocellulose via ex-situ modification following circular economy principles |
| ID_Doc |
5238 |
| Authors |
Natsia, A; Tsouko, E; Pateraki, C; Efthymiou, MN; Papagiannopoulos, A; Selianitis, D; Pispas, S; Bethanis, K; Koutinas, A |
| Title |
Valorization of wheat milling by-products into bacterial nanocellulose via ex-situ modification following circular economy principles |
| Year |
2022 |
| Published |
|
| DOI |
10.1016/j.scp.2022.100832 |
| Abstract |
This study investigated the production of bacterial cellulose (BC) from wheat milling by-products and its post-modification to obtain nanostructures (BCNs). Crude enzyme consortia produced by Aspergillus awamori were involved in the enzymatic hydrolysis of wheat milling by-products to produce a nutrient-rich fermentation feedstock for BC production. The fermentation efficiency with Komagataeibacter sucrofermentans DSM 15973 was evaluated under various pH values and C/free amino nitrogen (FAN) ratios. The highest BC concentration (5.2 g/L) and productivity (0.74 g/L/day) were obtained at a pH value of 5.2 anda C/FAN ratio of 14.5 g/g. Sequential ex-situ modification of BC using H2SO4-assisted hydrolysis, led to BCNs with 45.8-73.1 nm fiber di-ameter (D) and length (L)/D ratio higher than 13. The crystallinity index (CrI) of BCNs was in-creased by 1.1 folds (90.1%), while thermogravimetric analysis revealed slight differences re-garding the maximum decomposition temperature compared to the untreated BC (338 degrees C). The FT-IR spectra of BC and BCNs showed typical cellulose vibration bands while peaks at 748 cm-1 and 709 cm-1 indicated the presence of I alpha and I beta allomorphs. Size distribution of BCNs via dy-namic light scattering exhibited polydispersity within the nanoscale (72 nm and 931 nm). Sur -face charge of BCNs (in absolute value) was increased by 44.5% compared to BC. |
| Author Keywords |
Food industry by-products; Crude enzyme production; Solid state fermentation; Circular economy; Bacterial cellulose nanostructures; Physicochemical characterization |
| Index Keywords |
Index Keywords |
| Document Type |
Other |
| Open Access |
Open Access |
| Source |
Science Citation Index Expanded (SCI-EXPANDED) |
| EID |
WOS:000864912700007 |
| WoS Category |
Chemistry, Multidisciplinary; Green & Sustainable Science & Technology; Environmental Sciences |
| Research Area |
Chemistry; Science & Technology - Other Topics; Environmental Sciences & Ecology |
| PDF |
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