Orientated Bacterial Cellulose Culture Controlled by Liquid Substrate of Sili...

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Orientated Bacterial Cellulose Culture
Controlled by Liquid Substrate of Silicone Oil
with Different Viscosity and Thickness
By Ananda PUTRAy, Akira KAKUGO, Hidemitsu FURUKAWA, and Jian Ping GONG

We report the effect of oxygen and viscoelasticity of culture interface on the orientation of bacterial cellulose (BC) fibril
synthesized by Acetobacter xylimum (ATCC 53582) at a silicone oil/culture medium (liquid/liquid system) interface. In this
work, we used the silicone oil with various kinematic viscosities,
ranging from 10 to 3000 centistokes (CS). We found that
the birefringence, n as a measure of degree of orientation, fibril width, w, swelling degree, q, and tensile modulus, E,
increased as increase the thickness and viscosity of silicone oil. However, fracture stress, F and fracture strain, F decreased
with increase the silicone oil thickness and viscosity. Further, we also found that viscoelasticity of culture interface plays an
important role to determine the orientation alignment of BC fibrils. Meanwhile, oxygen did not show significant influence on
orientation of BC fibrils.
KEY WORDS: Bacterial Cellulose / Orientation / Silicone Oil / Oxygen / Thickness / Viscosity /