Lactic acid and its derivatives are important flavor substances in Nongxiang Baijiu which play a vital role in the aroma and taste of the wine. In order to screen lactic acid bacteria, this study tooke a Nongxiang Baijiu fermented grains as the research object. The isolation conditions of lactic acid bacteria were optimized, the effects of different DNA extraction methods were compared, and the species of lactic acid bacteria were identified by enzyme digestion and DNA sequencing. The results showed that 95 strains of lactic acid bacteria were preliminarily screened in MRS broth medium under anaerobic culture at 37°C for 24 h. The optimal method for DNA extraction of lactic acid bacteria was determined to be boiling method, and the strains were identified as Lactobacillus panis, which had the effects of producing lactic acid and n-propanol. This study has important reference value for the production and quality improvement of Nongxiang Baijiu.
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |