从废咖啡渣中机械分离出富含甘露聚糖的全纤维素纳米纤维:结构与特性

Noriko Kanai , Kohei Yamada , Chika Sumida , Miyu Tanzawa , Yuto Ito , Toshiki Saito , Risa Kimura , Miwako Saito-Yamazaki , Toshiyuki Oyama , Akira Isogai , Izuru Kawamura
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引用次数: 0

摘要

废弃咖啡渣(SCGs)含有丰富的多糖,包括甘露糖(29%)、半乳糖(11%)和葡萄糖(11%),是一种很有前景的全纤维素纳米纤维(HCNFs)来源。在这项研究中,使用超高压湿式喷射研磨机从 SCG 全纤维素中分离出了富含甘露聚糖的 HCNF,SCG 产率为 52%。将悬浮液通过带有 95 μm 喷嘴的高压匀浆器 1-15 次,精制 HCNF。5 次通过的 HCNF 宽 2.4 nm,长 0.7 μm,粘度平均聚合度为 143,纤维素微纤维上含有甘露聚糖 I 晶体(大小为 5-10 nm)。基于 Wise 方法的 75 °C 水脱木质素过程可使纤维素微纤维基质上的甘露聚糖重结晶。冷冻干燥后的 HCNF 宽度为 30-50 nm,在摇动 HCNF/水悬浮液时,HCNF 并未在水中完全纳米化,但其粘度与机械研磨制备的 HCNF 相当。SCGs 衍生的 HCNFs 在食品工业中具有很大的应用潜力。
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Mannan-rich Holocellulose nanofibers mechanically isolated from spent coffee grounds: Structure and properties

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.

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