Brown algae is the second most abundant group of marine algae [[1]], however, the large amounts of cellulose in its resulted slag was rarely extracted and studied. In this work, we opened up a new avenue to isolate the cellulose from the resulted slag of brown algae and to construct new materials consisted of nanofibers. The residue was treated by NaOH, hydrochloric acid and hydrogen peroxide to remove the protein, minerals, pigment and other impurity in the slag to obtain cellulose with yield of 20%. The cellulose sample was analysed with FT-IR, wide-angle X-ray diffraction, X-ray fluorescence, 13C NMR, thermogravimetric analysis and light scattering to confirm the cellulose structure and weight-average molecular (1.89×105). Interestingly, the SEM images indicated that the cellulose sample was consisted of nanofibers with diameter of 20-30nm, which could be subjected to an ultrasonic treatment to form monoradicular nanofiber. These nanofibers modified with hydrophobic long alkyl chain was a safe dietary fiber, and exhibited great potential applications in thickening oil to make the plant oil taste like the animal oil, as well as cosmetic additives. Acknowledgements：This work was supported by the Major Program of National Natural Science Foundation of China (21334005).

Extraction of cellulose consisted of nanofibers from brown algae and its applications

251st National Meeting (2016)

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