Abstract

Partially acetylated cellulose nanofibrils were obtained from the major residual stream associated with tequila production. The morphology and high cellulose content of the bagasse of Agave tequilana greatly facilitated deconstruction of such underutilized biomass. Mild chemical acetylation of the starting material afforded cellulose nanofibrils bearing surface ester groups, making the system less hydrophilic and plasticized. The acetylated nanofiber were characterized for morphology (atomic force microscopy), electrostatic charge (electrophoretic mobility), degree of substitution (DS) (titration) and main chemical features (infrared spectroscopy). Aqueous suspensions of the partially acetylated nanofibers (0.5% concentration) were mixed with a non-polar organic solvent (toluene) to obtain emulsions that were stable for at least 43 days. Cellulose nanofibrils of given DSs (different wettability) formed emulsions with different droplet size, thereby producing emulsion with different properties and stability. The cellulose nanofibrils with smaller sizes and higher contact angle (81°) generated small droplets (10–60 µm) while the cellulose nanofibrils with larger sizes and smaller water contact angle (40°) generated larger droplets (20–80 µm). Agave Bagasse CNF offers a great potential as Pickering emulsion stabilizers, which can be considered in the food, cosmetic and pharmaceutical fields.

摘要

从与龙舌兰酒生产相关的主要残余流中获得部分乙酰化的纤维素纳米纤丝。龙舌兰甘蔗渣的形态和高纤维素含量极大地促进了这种未充分利用的生物质的解构。起始材料的温和化学乙酰化提供了带有表面酯基的纤维素纳米纤丝，使系统的亲水性和增塑性降低。乙酰化纳米纤维的形态学（原子力显微镜）、静电荷（电泳迁移率）、取代度（DS）（滴定）和主要化学特征（红外光谱）进行了表征。将部分乙酰化的纳米纤维的水性悬浮液（0.5% 浓度）与非极性有机溶剂（甲苯）混合，以获得稳定至少 43 天的乳液。给定DSs（不同润湿性）的纤维素纳米纤丝形成具有不同液滴尺寸的乳液，从而产生具有不同性质和稳定性的乳液。具有较小尺寸和较高接触角 (81°) 的纤维素纳米纤丝产生小液滴 (10–60 µm)，而具有较大尺寸和较小水接触角 (40°) 的纤维素纳米纤丝产生较大的液滴 (20–80 µm)。Agave Bagasse CNF 作为 Pickering 乳液稳定剂具有巨大潜力，可用于食品、化妆品和制药领域。具有较小尺寸和较高接触角 (81°) 的纤维素纳米纤丝产生小液滴 (10–60 µm)，而具有较大尺寸和较小水接触角 (40°) 的纤维素纳米纤丝产生较大的液滴 (20–80 µm)。Agave Bagasse CNF 作为 Pickering 乳液稳定剂具有巨大潜力，可用于食品、化妆品和制药领域。具有较小尺寸和较高接触角 (81°) 的纤维素纳米纤丝产生小液滴 (10–60 µm)，而具有较大尺寸和较小水接触角 (40°) 的纤维素纳米纤丝产生较大的液滴 (20–80 µm)。Agave Bagasse CNF 作为 Pickering 乳液稳定剂具有巨大潜力，可用于食品、化妆品和制药领域。