Full
Outline
To establish a method for determining the content of 4 kinds of fusel alcohols, namely n-propanol, n-butanol, isobutanol and isoamyl alcohol in Baijiu by gas chromatography (GC) internal standard method.
The experiment employed a DB-WAX UI chromatographic column (30.0 m×0.25 mm, 0.25 μm) and selected tert-amyl alcohol as the internal standard. By systematically optimizing the instrument operating parameters, complete separation of each fusel alcohol from the internal standard and other components in the Baijiu matrix was achieved. The feasibility of the method was verified through method consistency analysis.
The determination coefficients (r2) for the 4 kinds of fusel alcohols within the set concentration range (0–500 mg/L) were all greater than 0.999. The limits of detection at 3 times the signal-to-noise ratio ranged from 0.073 to 0.128 mg/L, and the limits of quantitation at 10 times the signal-to-noise ratio ranged from 0.242 to 0.426 mg/L, meeting the detection requirements for low concentrations. The recovery rate ranged from 94.39% to 107.40%, demonstrating good precision and accuracy. The paired sample t-test revealed no significant difference (α=0.05, P>0.05) between the detection values obtained by this method and those determined according to GB/T 5009.48—2003 Methods for analysis hygienic standard of distilled wines and mixed wines. The method demonstrated good consistency.
This method is simple to operate, exhibits excellent separation efficiency demonstrates high stability and precision. It can effectively avoid systematic errors and meets the quantitative analysis requirements for fusel alcohols in 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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