{"title":"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","authors":"Noriko Kanai , Kohei Yamada , Chika Sumida , Miyu Tanzawa , Yuto Ito , Toshiki Saito , Risa Kimura , Miwako Saito-Yamazaki , Toshiyuki Oyama , Akira Isogai , Izuru Kawamura","doi":"10.1016/j.carpta.2024.100539","DOIUrl":null,"url":null,"abstract":"<div><p>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 <em>μ</em>m nozzle 1–15 times. The 5-pass HCNFs were 2.4 nm wide and 0.7 <em>μ</em>m 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.</p></div>","PeriodicalId":100213,"journal":{"name":"Carbohydrate Polymer Technologies and Applications","volume":"8 ","pages":"Article 100539"},"PeriodicalIF":6.2000,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666893924001191/pdfft?md5=ed8ac245f19be1965c69dad406a765de&pid=1-s2.0-S2666893924001191-main.pdf","citationCount":"0","resultStr":"{\"title\":\"Mannan-rich Holocellulose nanofibers mechanically isolated from spent coffee grounds: Structure and properties\",\"authors\":\"Noriko Kanai , Kohei Yamada , Chika Sumida , Miyu Tanzawa , Yuto Ito , Toshiki Saito , Risa Kimura , Miwako Saito-Yamazaki , Toshiyuki Oyama , Akira Isogai , Izuru Kawamura\",\"doi\":\"10.1016/j.carpta.2024.100539\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>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 <em>μ</em>m nozzle 1–15 times. The 5-pass HCNFs were 2.4 nm wide and 0.7 <em>μ</em>m 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.</p></div>\",\"PeriodicalId\":100213,\"journal\":{\"name\":\"Carbohydrate Polymer Technologies and Applications\",\"volume\":\"8 \",\"pages\":\"Article 100539\"},\"PeriodicalIF\":6.2000,\"publicationDate\":\"2024-06-25\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://www.sciencedirect.com/science/article/pii/S2666893924001191/pdfft?md5=ed8ac245f19be1965c69dad406a765de&pid=1-s2.0-S2666893924001191-main.pdf\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Carbohydrate Polymer Technologies and Applications\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S2666893924001191\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, APPLIED\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Carbohydrate Polymer Technologies and Applications","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2666893924001191","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, APPLIED","Score":null,"Total":0}
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.