Journal
FOOD RESEARCH INTERNATIONAL
Volume 173, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.foodres.2023.113397
Keywords
Fermented chili pepper; Pichia spp.; Flavor; Metabolomics; Genomics; Metabolic pathways
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This study investigated the influence of Pichia spp. on flavor formation and metabolic pathways during chili pepper fermentation. It was found that P. fermentans promoted the production of terpenes, L-glutamate, gamma-aminobutyric acid, and succinate, while P. manshurica produced more alcohols and phenols. Genomics analysis revealed an association between Pichia spp. and amino acid and carbohydrate metabolism.
The influence of Pichia spp. on flavor formation and metabolic pathways during chili pepper fermentation was investigated in this study. Multiple omics approaches were employed, including metabolomics analysis to identify volatile and non-volatile flavor compounds, and genomic analysis to gain insights into the underlying molecular mechanism driving flavor formation of chili peppers inoculated with Pichia spp. The results showed that inoculation with Pichia spp. accelerated fermentation process of chili peppers compared to spontaneous fermentation. Metabolomics analysis showed P. fermentans promoted characteristic terpenes [e.g., (Z)-& beta;-ocimene and linalool], L-glutamate, gamma-aminobutyric acid, and succinate production, while P. manshurica produced more alcohols (e.g., isoamyl alcohol and phenylethyl alcohol) and phenols (e.g., 4-ethylguaiacol and 2-methoxy4-methylphenol). Genomics analysis revealed that a substantial portion of the genes in Pichia spp. were associated with amino acid and carbohydrate metabolism. Specifically, the pathways involved in amino acid metabolism and the release of glycoside-bound aromatic compounds were identified as the primary drivers behind the unique flavor of fermented chili peppers, facilitated by Pichia spp.
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