Effect of different additives on bacterial cellulose production in PCS rotating disk bioreactor

International Conference and Exhibition on Biopolymers & Bioplastics

August 10-12, 2015 San Francisco, USA

Kuan-Chen Cheng and Shin-Ping Lin

Posters-Accepted Abstracts: J Material Sci Eng

Abstract :

Cellulose is the most abundantmacromolecular on earth observed in large quantity from nature which is predominantly
generated by vascular plant and algae, but also by bacteria. Bacterial cellulose (BCel)exhibits the unique physical properties at
nanoscalenetwork(i.e. high water content and high tensile strength), and does not require extra processing steps to remove impurities
such as lignin, pectin, and hemicellulose. Previous study demonstrated that BCel can be produced semi-continuously utilizing PCS
rotating disk bioreactor (PCS-RDB). In this study, different additives including avicel, carboxymeylcellulose, agar and sodium alginate
were added into culture medium in PCS-RDB to improve the productivity of BCel and its material property. The produced BCel was
analyzed using fourier transform infrared spectroscopy (FTIR), scan electron microscopy (SEM), thermogravimetricanalysis (TGA),
X-ray diffraction (XRD) and dynamic mechanicalanalysis (DMA). The results demonstrated that both CMC and avicel addition
can increase the productivity of BCel in PCS-RDB. The highestBCel production reached 0.64 g/slice when 0.8% of avicelwas added.
The FTIR and XRD results indicated that CMC and avicel might be incorporated into BCel during production, and disordered BCel
structure to decrease its crystallinity. The SEM result showed that the incorporated additives may attach onBCel fibers and increase
fiber size. In future work,dynamic mechanicalanalysis (DMA) should be finish to confirm the effects of different additives addition
in mechanical property.