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Continuous production of fructooligosaccharides by recycling of the thermal-stable β-fructofuranosidase produced by Aspergillus niger

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Abstract

Objective

To achieve continuous production of fructooligosaccharides (FOS) by recycling of the mycelial cells containing the thermal-stable β-fructofuranosidase in Aspergillus niger without immobilization.

Results

The thermal-stable β-fructofuranosidase FopA-V1 was successfully expressed in A. niger ATCC 20611 under the control of the constitutive promoter PgpdA. The engineered A. niger strain FV1-11 produced the β-fructofuranosidase with improved thermostability, which remained 91.2% of initial activity at 50 °C for 30 h. Then its mycelial β-fructofuranosidase was recycled for the synthesis of FOS. It was found that the enzyme still had 79.3% of initial activity after being reused for six consecutive cycles, whereas only 62.3% β-fructofuranosidase activity was detected in the parental strain ATCC 20611. Meanwhile, the FOS yield of FV1-11 after six consecutive cycles reached 57.1% (w/w), but only 51.0% FOS yield was detected in ATCC 20611.

Conclusions

The thermal-stable β-fructofuranosidase produced by A. niger can be recycled to achieve continuous synthesis of FOS with high efficiency, providing a powerful and economical strategy for the industrial production of FOS.

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Acknowledgements

This work was supported by the grants from the National Key R&D Program of China (No. 2018YFA0900503), the Shandong Key Research and Development Program (No. ZR2019ZD19), and the Youth Interdisciplinary Science and Innovative Research Groups of Shandong University (2020QNQT006).

Supporting information

Supplementary Table 1—Primers used in this study.

Supplementary Figure 1—Chromatography profiles of FOS production.

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Correspondence to Feng Huang or Yaohua Zhong.

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Wang, J., Zhang, J., Wang, L. et al. Continuous production of fructooligosaccharides by recycling of the thermal-stable β-fructofuranosidase produced by Aspergillus niger. Biotechnol Lett 43, 1175–1182 (2021). https://doi.org/10.1007/s10529-021-03099-w

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  • DOI: https://doi.org/10.1007/s10529-021-03099-w

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