Journal
MATERIALS
Volume 9, Issue 3, Pages -Publisher
MDPI
DOI: 10.3390/ma9030206
Keywords
carbon fiber (CF); oxidation treatment; surface properties; cell immobilization; xylitol fermentation
Categories
Funding
- National Science Foundation of China [21306040, U1304505]
- Excellent Talents Project of Henan University of Technology [150493]
- Key Young Teachers Project of Henan Province
- Fundamental Research Funds for the Henan Provincial Colleges and Universities in Henan University of Technology [2014YWQQ17]
- State Key Laboratory of Chemical Resource Engineering [CRE-2014-C-301]
- Science Foundation of Henan University of Technology [2014CXRC06]
- National Engineering Laboratory of Wheat & Corn Further Processing, Henan University of Technology [001248]
- Key Scientific Research Project of Colleges and Universities in Henan Province [16A416001]
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Nitric acid (HNO3)-treated carbon fiber (CF) rich in hydrophilic groups was applied as a cell-immobilized carrier for xylitol fermentation. Using scanning electron microscopy, we characterized the morphology of the HNO3-treated CF. Additionally, we evaluated the immobilized efficiency (IE) of Candida tropicalis and xylitol fermentation yield by investigating the surface properties of nitric acid treated CF, specifically, the acidic group content, zero charge point, degree of moisture and contact angle. We found that adhesion is the major mechanism for cell immobilization and that it is greatly affected by the hydrophilic-hydrophilic surface properties. In our experiments, we found 3 hto be the optimal time for treating CF with nitric acid, resulting in an improved IE of Candida tropicalis of 0.98 g.g(-1) and the highest xylitol yield and volumetric productivity (70.13% and 1.22 g.L-1.h(-1), respectively). The HNO3-treated CF represents a promising method for preparing biocompatible biocarriers for multi-batch fermentation.
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