Abstract
2-Phenylethanol (2-PE) with a pleasant rose-like odor is a valuable aroma compound used in many fields. 2-PE production by yeast is considered a promising alternative to chemical synthesis and extraction from natural materials. In this report, the strain YF1702 produced a significantly higher level of 2-PE when compared with other strains isolated from Baijiu-producing environments. According to morphological properties, physiological and biochemical characteristics, and 26S rDNA sequence analysis, strain YF1702 was identified as Pichia kudriavzevii. The optimal fermentation conditions of YF1702 for producing 2-PE were obtained by single-factor experiments, Plackett–Burman design, steepest ascent design, and response surface methodology. The optimal inoculation conditions for strain YF1702 were 50 g/L glucose, 6.0 g/L yeast extract, 10.7 g/L L-Phe, and 32 g/L Tween-60. The optimal fermentation conditions were pH 2.3, 26 °C, 210 rpm shaking, an inoculum size of 0.4% (v/v), and a loading volume of 25.5 mL/250 mL for 56 h. Under these optimal conditions 2-PE production by YF1702 was 5.09 g/L. This strain has the potential to increase the content of 2-PE in Baijiu production and enhance the aroma characteristics of Baijiu.
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Acknowledgements
We thank Andrew Dingley for insightful discussions and providing language help. This research was supported by the National Natural Science Foundation of China (No. 31701592, 31830069, and 31671798), General Project of Scientific Research Program of Beijing Municipal Education Commission (grant number KM201910011006/PXM2019_014213_000007) and Quality Construction of Talents Training/First-class Speciality Construction/Food Science and Engineering (PXM2019_014213_000010).
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Fan, G., Cheng, L., Fu, Z. et al. Screening of yeasts isolated from Baijiu environments for 2-phenylethanol production and optimization of production conditions. 3 Biotech 10, 275 (2020). https://doi.org/10.1007/s13205-020-02267-5
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DOI: https://doi.org/10.1007/s13205-020-02267-5