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Objective To establish a qualitative and quantitative analytical method for determination of short-chain fatty acids in table salt using headspace solid phase microextraction arrow-gas chromatography-mass spectrometry. Methods A phosphoric acid solution was added to the salt samples, and the headspace solid phase microextraction arrow technique was employed to extract and enrich the short-chain fatty acids. The effects of extraction fiber, extraction temperature, extraction time, and incubation time on the extraction efficiency were investigated. The target compounds were detected by gas chromatography-mass spectrometry and quantified using the external standard method. Results The 100 μm Polyacrylate extraction fiber demonstrated good selectivity for short-chain fatty acids. Under optimal conditions (extraction temperature of 40 °C, extraction time of 30 min, desorption time of 5 min and incubation time of 20 min), the method showed excellent linearity for 9 kinds of short-chain fatty acids, with correlation coefficients greater than 0.995. The limits of detection ranged from 0.25 to 25.00 μg/kg, the recovery rates were between 92.2% and 100.1%, and the relative standard deviations ranged from 1.4% to 9.4%. Conclusion The established method for analyzing short-chain fatty acids in table salt is characterized by simple sample preparation, high sensitivity, good recovery rates and stability, making it suitable for the detection of short-chain fatty acids in table salt.
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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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