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Objective To establish a rapid quantitative detection method for ester content in Nongxiangxing crude Baijiu by using mid-infrared spectroscopy. Methods The mid-infrared spectroscopy analysis technology combined with gas chromatography was used to detect Nongxiangxing crude Baijiu. Partial least squares method was employed to establish mid-infrared quantitative detection models for ethyl hexanoate, ethyl acetate, ethyl lactate, and ethyl butyrate in Nongxiangxing crude Baijiu. Results The detection models for ethyl hexanoate, ethyl acetate and ethyl lactate exhibited linear coefficients (r2) exceeding 0.99 and root mean square error were below 0.07 g/L, indicating that the models had good goodness of fit and stability. The average relative error of the prediction results after external validation was lower than 3.50%, indicating that the models had good detection performance and the predicted values were close to the true values. Due to its low content and narrow spectral range, the prediction effect of the model for ethyl butyrate was poor. Conclusion This method have a good detection ability for the contents of ethyl hexanoate, ethyl acetate and ethyl lactate in Nongxiangxing crude Baijiu. It can meet the basic needs of enterprises for the rapid detection and analysis of crude Baijiu in daily production, providing a new development direction for the rapid detection analysis, and grading of Baijiu.
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| 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 |
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