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Controlling composition and color characteristics of Monascus pigments by pH and nitrogen sources in submerged fermentation

Paper ID Volume ID Publish Year Pages File Format Full-Text
20245 43165 2015 10 PDF Available
Title
Controlling composition and color characteristics of Monascus pigments by pH and nitrogen sources in submerged fermentation
Abstract

Submerged fermentations of Monascus anka were performed with different nitrogen sources at different pH in 3 L bioreactors. The results revealed that the Monascus pigments dominated by different color components (yellow pigments, orange pigments or red pigments) could be selectively produced through pH control and nitrogen source selection. A large amount of intracellular pigments dominated by orange pigments and a small amount of water-soluble extracellular yellow pigments were produced at low pH (pH 2.5 and 4.0), independently of the nitrogen source employed. At higher pH (pH 6.5), the role of the nitrogen source became more significant. In particular, when ammonium sulfate was used as nitrogen source, the intracellular pigments were dominated by red pigments with a small amount of yellow pigments. Conversely, when peptone was used, intracellular pigments were dominated by yellow pigments with a few red pigments derivatives. Neither the presence of peptone nor ammonium sulfate promoted the production of intracellular orange pigments while extracellular pigments with an orangish red color were observed in both cases, with a higher yield when peptone was used. Two-stage pH control fermentation was then performed to improve desirable pigments yield and further investigate the effect of pH and nitrogen sources on pigments composition. These results provide a useful strategy to produce Monascus pigments with different composition and different color characteristics.

Keywords
Monascus pigments composition; Color characteristics; Submerged fermentation; pH; Nitrogen sources
First Page Preview
Controlling composition and color characteristics of Monascus pigments by pH and nitrogen sources in submerged fermentation
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Bioscience and Bioengineering - Volume 120, Issue 2, August 2015, Pages 145–154
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering