The effects of citric acid at pH values of 3.0, 4.0, and 4.5 on growth and metabolism of anaerobic Saccharomyces cerevisiae and Zygosaccharomyces bailii cultures were investigated. S. cerevisiae and Z. bailii exhibited similar tolerances to citric acid, as determined by growth measurements, at all three pH values investigated. The citric-acid-induced growth inhibition of both yeast species increased with increasing pH values, indicating that the antimicrobial mechanism of citric acid differs from that of classical weak-acid preservatives. In S. cerevisiae, citric acid shifted the primary energy metabolism towards lower ethanol production and higher glycerol production, thus resulting in lower ATP production. These metabolic changes in S. cerevisiae were pH-dependent; i.e. the higher the pH, the lower the ATP production, and they may explain why growth of S. cerevisiae is more inhibited by citric acid at higher pH values. In Z. bailii, citric acid also caused an increased glycerol production, although to a lesser extent than in S. cerevisiae, but it caused virtually no changes in ethanol and ATP production.
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| Evidence ID | Analyze ID | Gene/Complex | Systematic Name/Complex Accession | Qualifier | Gene Ontology Term ID | Gene Ontology Term | Aspect | Annotation Extension | Evidence | Method | Source | Assigned On | Reference |
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| Evidence ID | Analyze ID | Gene | Gene Systematic Name | Phenotype | Experiment Type | Experiment Type Category | Mutant Information | Strain Background | Chemical | Details | Reference |
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| Evidence ID | Analyze ID | Gene | Gene Systematic Name | Disease Ontology Term | Disease Ontology Term ID | Qualifier | Evidence | Method | Source | Assigned On | Reference |
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| Evidence ID | Analyze ID | Regulator | Regulator Systematic Name | Target | Target Systematic Name | Direction | Regulation of | Happens During | Regulator Type | Direction | Regulation Of | Happens During | Method | Evidence | Strain Background | Reference |
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| Site | Modification | Modifier | Source | Reference |
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| Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Allele | Assay | Annotation | Action | Phenotype | SGA score | P-value | Source | Reference | Note |
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| Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Assay | Annotation | Action | Modification | Source | Reference | Note |
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| Complement ID | Locus ID | Gene | Species | Gene ID | Strain background | Direction | Details | Source | Reference |
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| Evidence ID | Analyze ID | Dataset | Description | Keywords | Number of Conditions | Reference |
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