| Autor: |
Noriko Kanai, Kohei Yamada, Chika Sumida, Miyu Tanzawa, Yuto Ito, Toshiki Saito, Risa Kimura, Miwako Saito-Yamazaki, Toshiyuki Oyama, Akira Isogai, Izuru Kawamura |
| Jazyk: |
angličtina |
| Rok vydání: |
2024 |
| Předmět: |
|
| Zdroj: |
Carbohydrate Polymer Technologies and Applications, Vol 8, Iss , Pp 100539- (2024) |
| Druh dokumentu: |
article |
| ISSN: |
2666-8939 |
| DOI: |
10.1016/j.carpta.2024.100539 |
| Popis: |
Spent coffee grounds (SCGs) contain abundant polysaccharides consisting of mannose (29 %), galactose (11 %), and glucose (11 %) and are a promising source of holocellulose nanofibers (HCNFs). In this study, the mannan-rich HCNFs were isolated from the SCG holocellulose in the yield of 52 % SCGs using an ultrahigh-pressure wet jet mill. The HCNF was refined by passing the suspension through a high-pressure homogenizer with a 95 μm nozzle 1–15 times. The 5-pass HCNFs were 2.4 nm wide and 0.7 μm long with 143 viscosity-average degrees of polymerization and contained mannan I crystals (5–10 nm in size) on cellulose microfibrils. The delignification process in water at 75 °C based on the Wise method allowed recrystallization of mannan on a cellulose microfibril substrate. The once-freeze-dried HCNFs had 30–50 nm widths and were not fully nanofibrillated in water when shaking the HCNF/water suspensions but exhibited comparable viscosities to those prepared by mechanical milling. The SCGs-derived HCNFs have a high potential for application in the food industry. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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