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Objective To establish a method for the determination of ethylenediaminetetraacetic acid ferric sodium salt (NaFeEDTA) by microemulsion liquid chromatography. Methods After simple dilution and centrifugation of the sample, it could be filtered through a 0.22 μm microporous membrane and directly loaded onto a Waters BEH C18 column (2.1 mm×150 mm, 1.7 µm) was the chromatographic column. The microemulsion mobile phase was 3.64 g/L cetyltrimethylammonium bromide-50 g/L acetonitrile-8 g/L ethyl acetate-6.8 g/L potassium dihydrogen phosphate. The flow rate was 0.30 mL/min and the detection wavelength was 254 nm. The column temperature was 30 ℃ temperature. External standard method was used for quantitative determination. Results Under the selected experimental conditions, the mass concentration of NaFeEDTA had a good linear relationship (r≥0.999) within the range of 0.50-35.00 µg/mL, the limits of detection were 50 mg/kg. The recovery rates of NaFeEDTA were investigated, with average recovery rates ranging from 92.7% to 97.7%. Conclusion This method is easy to operate and has good reproducibility. The method can be used for the detection of NaFeEDTA content in soy sauce.
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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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