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Process optimization and kinetic evaluation for biosynthesis of d-isoascorbyl stearate

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Abstract

The synthesis of d-isoascorbyl stearate from d-isoascorbic acid and stearic acid with immobilized lipase (Novozym®435) as catalyst was studied. Response surface methodology and Box-Behnken design with six variables and three levels were employed to evaluate the effects of processing conditions on the conversion of d-isoascorbic acid. The results confirmed that the response surface method and statistical analysis were proved to be useful in developing optimal conditions for d-isoascorbyl stearate synthesis. The optimum conditions were predicted as follows: reaction temperature 48 °C, reaction time 17.7 h, immobilized lipase amount 50.0 % (w/w, of d-isoascorbic acid), substrate molar ratio 9:1 (stearic acid to d-isoascorbic acid), d-isoascorbic acid concentration 0.14 mol/L (based on solvent), 4A molecular sieve addition 200 g/L (based on solvent), and the optimal conversion was 90.6 %. Through the kinetics model fitting of the esterification, it was considered that the esterification conformed to a Ping–Pong bi–bi kinetic model with d-isoascorbic acid inhibition, and the obtained kinetic constants showed that the inhibition of d-isoascorbic acid and the enzyme affinity to substrate were abate with the increase of the reaction temperature.

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Acknowledgments

This research was financially supported by Technology Breakthrough Major Project in Henan Province (Grant No: 112101210200).

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Correspondence to Tao Li or Baozeng Ren.

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Liu, Z., Shen, Y., Li, W. et al. Process optimization and kinetic evaluation for biosynthesis of d-isoascorbyl stearate. Bioprocess Biosyst Eng 38, 833–839 (2015). https://doi.org/10.1007/s00449-014-1326-y

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  • DOI: https://doi.org/10.1007/s00449-014-1326-y

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