Flavonoid Glycoside Transformation Catalyzed by Whole-Cell Catalysts Using a PVDF Membrane Reactor Coupled with Reaction
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ORIGINAL PAPER
Flavonoid Glycoside Transformation Catalyzed by Whole‑Cell Catalysts Using a PVDF Membrane Reactor Coupled with Reaction and Separation Ting Huang1 · Fan Zhang1 · Bo Wang1 · Wang‑Sheng Ye1 · Qiang‑Min Peng1 · Fu‑An Wu1,2,3,4 · Jun Wang1,2,3,4 Received: 7 October 2019 / Accepted: 23 February 2020 © Springer Nature B.V. 2020
Abstract Inefficient utilization of flavonoid resources from agricultural waste has caused serious pollution of the ecological environment. Isoquercitrin, a natural and rare flavonoid, shows obvious pharmacological activities. Abandoned rutin from plant could be used to produce isoquercitrin by the employment of the rhamnose hydrolysis. This study reported an efficient preparation process of isoquercitrin using the conversion of rutin catalyzed by whole-cell catalysts in a polyvinylidene fluoride (PVDF) membrane reactor coupled with reaction and separation. The PVDF hollow fibre membrane with filtration precision of 0.1 μm was selected as the membrane module. Recombinant Escherichia coli whole cells were used as catalysts. And the effects of the extractant-substrate volume ratio, reaction temperature, pH and substrate concentration on the yield were investigated. The results showed that the isoquercitrin yield of the coupling system with an extractant increased within 0–8 h and reached a maximum yield of 82.2 ± 2.3% at 8 h. The maximum isoquercitrin yield of 87.92 ± 2.93% was obtained under the optimum reaction conditions as follows: a temperature of 40 °C, a ratio of extractant: substrate of 3:4, a pH value of 5.5, and a substrate concentration of 0.02 g/L. After five-successive cycles, the relative enzyme activity of the whole-cell catalysts was maintained above 50%. The flux of the membrane used for 10 h was restored to 75% when washed seven times with a 1% (v/v) aqueous HCl solution. Thus, the PVDF membrane reactor coupled with reaction and separation could be used in the industrial application of biocatalysis due to the increase of reaction efficiency and the decrease of product inhibition.
Ting Huang and Fan Zhang have contributed equally to this work. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s12649-020-00990-x) contains supplementary material, which is available to authorized users. * Jun Wang [email protected] 1
School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang 212018, People’s Republic of China
2
Sericultural Research Institute, Chinese Academy of Agricultural Sciences, Zhenjiang 212018, People’s Republic of China
3
Key Laboratory of Silkworm and Mulberry Genetic Improvement, Ministry of Agriculture and Rural Affairs, Zhenjiang 212018, People’s Republic of China
4
Jiangsu Key Laboratory of Sericultural Biology and Biotechnology, Zhenjiang 212018, People’s Republic of China
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Waste and Biomass Valorization
Graphic Abstract
Keywords Coupled with reaction and separation · Flavonoid glycoside · Membrane bioreactor · Biotransformation · Wh
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