Abstract
High-purity fructooligosaccharides (FOS) were produced from sucrose by an innovative process incorporating immobilized Aspergillus japonicus and Pichia heimii cells. Intracellular FTase of A. japonicus converted sucrose into FOS and glucose, and P. heimii fermented glucose mainly into ethanol. The continuous production of FOS was carried out using a tanks-in-series bioreactor consisting of three stirred tanks. When a solution composed of 1 g L−1 yeast extract and 300 g L−1 sucrose was fed continuously to the bioreactor at a dilution rate of 0.1 h−1, FOS at a purity of up to 98.2 % could be achieved and the value-added byproduct ethanol at 79.6 g L−1 was also obtained. One gram of sucrose yielded 0.62 g FOS and 0.27 g ethanol. This immobilized dual-cell system was effective for continuous production of high-purity FOS and ethanol for as long as 10 days.
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Abbreviations
- F:
-
Fructose
- G:
-
Glucose
- GF:
-
Sucrose
- GF2 :
-
1-Kestose
- GF3 :
-
Nystose
- GF4 :
-
1F-Fructosyl nystose
- DP of FOS:
-
Degree of polymerization of FOS
- Yc of FOS:
-
Conversion yield of FOS (g FOS produced/g sucrose consumed)
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This work was supported by the National Science Council (NSC), Taiwan, under Contract NSC 99-2221-E-036-019.
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Sheu, D.C., Chang, J.Y., Wang, C.Y. et al. Continuous production of high-purity fructooligosaccharides and ethanol by immobilized Aspergillus japonicus and Pichia heimii . Bioprocess Biosyst Eng 36, 1745–1751 (2013). https://doi.org/10.1007/s00449-013-0949-8
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DOI: https://doi.org/10.1007/s00449-013-0949-8