Abstract
The use of lignocellulosic residues for ethanol production is limited by toxic compounds in fermenting yeasts present in diluted acid hydrolysates like acetic acid and 2-furaldehyde. The respiratory deficient phenotype gives the cell the ability to resist several toxic compounds. So the aim of this work was to evaluate the tolerance to toxic compounds present in lignocellulosic hydrolysates like acetic acid and 2-furaldehyde in Pichia stipitis and its respiratory deficient strains. The respiratory deficient phenotype was induced by exposure to chemical agents such as acriflavine, acrylamide and rhodamine; 23 strains were obtained. The selection criterion was based on increasing specific ethanol yield (g ethanol g−1 biomass) with acetic acid and furaldehyde tolerance. The screening showed that P. stipitis NRRL Y-7124 ACL 2-1RD (lacking cytochrome c), obtained using acrylamide, presented the highest specific ethanol production rate (1.82 g g−1 h−1). Meanwhile, the ACF8-3RD strain showed the highest acetic acid tolerance (7.80 g L−1) and the RHO2-3RD strain was able to tolerate up to 1.5 g L−1 2-furaldehyde with a growth and ethanol production inhibition of 23 and 22 %, respectively. The use of respiratory deficient yeast phenotype is a strategy for ethanol production improvement in a medium with toxic compounds such as hydrolysed sugarcane bagasse amongst others.
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Abbreviations
- Y x /s :
-
Biomass yield (g biomass g−1 substrate)
- Yet/s :
-
Ethanol yield (g ethanol g−1 substrate)
- Yet/x :
-
Specific etanol yield (g ethanol g−1 biomass)
- V p :
-
Ethanol specific production rate (g ethanol g−1 biomass h−1)
- X :
-
Biomass production (g L−1)
- X 0 :
-
Biomass production without inhibitor (g L−1)
- k :
-
Acetic acid sensitivity
- t :
-
Time (h)
- P :
-
Acetic acid (g L−1)
- P c :
-
Acetic acid critic concentration (g L−1)
- n :
-
Exponential adjustment
- X e :
-
Biomass production with 2-furaldehyde (g L−1)
- P e :
-
Ethanol production with 2-furaldehyde (g L−1)
- P 0 :
-
Ethanol production without 2-furaldehyde (g L−1)
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Acknowledgments
Authors acknowledged the economical support from the National Council of Science and Technology, Mexico (CONACYT project #128052) and the critical reading of Patricia Hayward Jones MSc. and Dulce María Barradas Dermitz MSc.
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Ortiz-Muñiz, B., Rasgado-Mellado, J., Solis-Pacheco, J. et al. Evaluation of the tolerance of acetic acid and 2-furaldehyde on the growth of Pichia stipitis and its respiratory deficient. Bioprocess Biosyst Eng 37, 2061–2066 (2014). https://doi.org/10.1007/s00449-014-1183-8
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DOI: https://doi.org/10.1007/s00449-014-1183-8