Saccharomyces cerevisiae is a key microorganism in the fermentation industry. During the logarithmic growth period, yeasts proliferate rapidly and accumulate a large amount of primary metabolites. Regulating this period can improve the fermentation efficiency. In order to understand the fermentation of S. cerevisiae in the logarithmic growth period, the main metabolites and metabolic pathways were analyzed by liquid chromatography tandem mass spectrometry(LC-MS/MS). The results showed that 927 metabolites were identified, among which the quantity and relative content of compounds containing nitrogen and sulfur were the highest. Among the metabolic pathways involved in these metabolites, nucleotide metabolism, carbohydrate metabolism, cofactor and vitamin metabolism and amino acid metabolism were the main metabolic pathways of S. cerevisiae, and the relative abundance of pyrimidine metabolism was the highest in nucleotide metabolism. Metabolites and metabolic pathways mainly involved the construction of yeast cell membrane, the replication of genetic information, the transmission of signal molecules, the regulation of osmotic pressure, and so on. These metabolic processes provided basic small molecular substances and energy for yeast growth, and also provided raw materials for the biosynthesis of biological macromolecules such as protein and nucleic acid. In addition, the metabolic flow distribution of carbohydrate and amino acid metabolism could better support the nucleotide metabolism of S. cerevisiae and promote the proliferation, growth, and survival of S. cerevisiae. The results provided a scientific basis for the directional transformation of S. cerevisiae and the improvement of its fermentation efficiency.
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