Key Lab of Science and Technology of Eco-Textile, Ministry of Education, College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, People's Republic of China; Innovation Center for Textile Science and Technology of DHU, Donghua University, Shanghai 201620, People's Republic of China.
University of Chinese Academy of Sciences 19A Yuquan Road, Shijingshan District, Beijing 100049, People's Republic of China; Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences, 32 West 7th Avenue, Tianjin Airport Economic Area, Tianjin 300308, People's Republic of China.
Carbohydr Polym. 2021 Feb 15;254:117445. doi: 10.1016/j.carbpol.2020.117445. Epub 2020 Nov 25.
Nanocellulose are promising Pickering emulsion stabilizers for being sustainable and non-toxic. In this work, semicrystalline cellulose oligomers (SCCO), which were synthesized from maltodextrin using cellobiose as primer by in vitro enzymatic biosystem, were exploited as stabilizers for oil-in-water Pickering emulsions. At first, the morphology, structure, thermal and rheological properties of SCCO suspensions were characterized, showing that SCCO had a sheet morphology and typical cellulose-Ⅱ structure with 56 % crystallinity. Then the kinetic stabilities of emulsions containing various amounts of SCCO were evaluated against external stress such as pH, ionic strength, and temperature. Noting that SCCO-Pickering emulsions exhibited excellent stabilities against changes in centrifugation, pH, ionic strengths, and temperatures, and it was also kinetically stable for up to 6 months. Both SCCO suspensions and their emulsions exhibited gel-like structures and shear-thinning behaviors. These results demonstrated great potential of SCCO to be applied as nanocellulosic emulsifiers in food, cosmetic and pharmaceutical industries.
纳米纤维素作为可持续且无毒的 Pickering 乳液稳定剂具有广阔的应用前景。在这项工作中，我们利用体外酶生物体系以麦芽糊精为起始物，以纤维二糖为引物合成的半结晶纤维素低聚物（SCCO）作为水包油型 Pickering 乳液的稳定剂。首先，对 SCCO 悬浮液的形态、结构、热性能和流变性能进行了表征，结果表明 SCCO 具有片状形态和典型的纤维素-Ⅱ结构，结晶度为 56%。然后，评估了含有不同量 SCCO 的乳液在外加应力（如 pH 值、离子强度和温度）下的动力学稳定性。结果表明，SCCO-Pickering 乳液对离心、pH 值、离子强度和温度的变化表现出优异的稳定性，并且在长达 6 个月的时间内也具有动力学稳定性。SCCO 悬浮液及其乳液均表现出凝胶状结构和剪切变稀行为。这些结果表明 SCCO 具有作为食品、化妆品和制药行业纳米纤维素乳化剂的巨大潜力。
