Effective biotransformation of benzaldehyde to a stable L-PAC using calcium alginate entrapped pyruvate decarboxylase of an auxotrophic Saccharomyces cerevisiae

Main Article Content

Bakhtawar Khan, Sikander Ali, Hafsa Ahmad, Saba Nasir, Arslan Younas, Yousaira Masud, Rahat Zamir, Namra Mariam, Nishat Zafar

Keywords

Saccharomyces cerevisiae, L-phenylacetylcarbinol, Biotransformation, Benzaldehyde, Calcium alginate entrapment

Abstract

The present study deals with the effective biotransformation of benzaldehyde to a stable L-PAC using calcium alginate entrapped pyruvate decarboxylase of an auxotrophic Saccharomyces cerevisiae via submerged fermentation. The wild-type of Saccharomyces cerevisiae ISL-7 was mutagenised using UV radiations. Significant increase in L-PAC production was found as compared to wild-type. Out of 29 mutants, UV-t6 was selected for maximum L-PAC production after primary and secondary screening. The auxotrophic mutant UV-t6 resulted in 1.25fold increase in L-PAC activity than wild-type ISL-7 when exposed to UV radiations. The effect of different benzaldehyde concentrations and incubation time on production of L-PAC was also studied. The maximum PDC activity 95.99±5.7 U/ml and L-PAC activity 22.46±1.34 g/l was observed after 4 h of incubation at 28ºC for 60 µl benzaldehyde concentration. The selected mutant strain UV-t6also showed maximum L-PAC production with better L-PAC fermentation kinetics as compared to wild-type ISL-7. The PDC of auxotrophic mutant strain of Saccharomyces cerevisiae UV-t6 was immobilized using calcium alginate beads. The effect of enzyme concentration, bead size and cell holding time on L-PAC activity was also studied. The immobilized enzyme exhibited maximum PDC and L-PAC activity i.e. 116.22±8.13 U/ml and 13.72±0.96g/l at enzyme concentration 1.5 ml as compared to free enzyme (PDC activity 115.20±8.06 U/ml and L-PAC activity 12.97±0.91 g/l). The maximum L-PAC activity was observed for bead size 3 mm i.e. 14.56±1.16 g/l along with cell holding time 10 min. This study revealed that auxotrophic mutant strain of Saccharomyces cerevisiae along with immobilized PDC exhibited 1.68fold increase in L-PAC production than wild-type.

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References

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