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Bioresour Technol. 2014;152:505-10. doi: 10.1016/j.biortech.2013.11.042. Epub 2013 Nov 27.

Utilization of glycerin byproduct derived from soybean oil biodiesel as a carbon source for heterologous protein production in Pichia pastoris.

Author information

  • 1Centro de Biotecnologia Molecular, Instituto de Ciências Biológicas, Universidade de Brasília, Brasília, DF 70910-900, Brazil.
  • 2Laboratório de Materiais e Combustíveis, Instituto de Química, Universidade de Brasília, Brasília, DF 70910-000, Brazil.
  • 3Centro de Biotecnologia Molecular, Instituto de Ciências Biológicas, Universidade de Brasília, Brasília, DF 70910-900, Brazil; Pós-Graduação em Ciências Genômicas e Biotecnologia, Universidade Católica de Brasília, Brasília, DF 70790-160, Brazil. Electronic address: nadiasp@unb.br.

Abstract

Crude glycerol, also known as glycerin, is the main byproduct of the biodiesel industry. It has been estimated that up to 40,000 tons of glycerin will be produced each year by 2020. This study evaluated the value-added use of crude glycerol derived from soybean biodiesel preparation as a carbon source for heterologous protein production using the yeast Pichia pastoris. Eleven glycerin samples were obtained by methanolysis of soybean oil using different acids or bases as catalysts. Cell growth experiments showed that crude glycerol containing either potassium or sodium hydroxide resulted in 1.5-2 times higher final cell densities when compared to glycerol P.A. Finally, crude glycerol containing sodium hydroxide was successfully utilized for constitutive heterologous α-amylase production in P. pastoris. This study demonstrated that crude glycerol without any purification steps may be directly used as carbon source for protein production in P. pastoris.

Copyright © 2013 Elsevier Ltd. All rights reserved.

KEYWORDS:

Crude glycerol; Fermentation; Heterologous expression; Pichia pastoris

PMID:
24342909
[PubMed - indexed for MEDLINE]
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