Acid-free preparation and characterization of kelp (Laminaria japonica) nanocelluloses and their application in Pickering emulsions

Publication date: Available online 16 February 2020Source: Carbohydrate PolymersAuthor(s): Jiulin Wu, Wenjin Zhu, Xiaodan Shi, Qingxiang Li, Chenguang Huang, Yongqi Tian, Shaoyun WangAbstractCellulose nanofibers (CNFs) from kelp were prepared by cellulase treatment with lengths greater than 3 μm. CNFs were further TEMPO-oxidized (TEMPO-CNFs), the lengths were 0.6-1 μm. The crystallinity of TEMPO-CNFs increased to 66.5%. FTIR spectra revealed no changes in the basic cellulose structures of CNFs and TEMPO-CNFs. TGA analysis indicated that TEMPO-CNFs were more sensitive to temperature than cellulose and CNFs. AFM and TEM images showed that intertwined CNFs fibers were divided into individual nanofibrils. Delamination was found in CNFs emulsion. The oil droplet size was less than 20 μm, which became smaller in TEMPO-CNFs emulsion. The addition of NaCl increased the volume of TEMPO-CNFs emulsion but increased oil droplets size. TEMPO-CNFs emulsion had the largest volume with the smallest and most homogeneous oil droplets at pH 3. Further, TEMPO-CNFs emulsions showed good stability after storage for 30 days. TEMPO-CNFs could also emulsify higher content of sunflower oil (50%).
Source: Carbohydrate Polymers - Category: Biomedical Science Source Type: research