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Compare and evaluate the application of ion chromatography and enzymatic colorimetry in the determination of choline in infant formula milk powder, and select a more suitable detection method for enterprise quality control.
A comparative analysis between ion chromatography and enzymatic colorimetry was conducted by using indicators such as standard curves, detection limits, precision, accuracy, uncertainty assessment and determination costs.
Both ion chromatography and enzymatic colorimetry demonstrated good linear relationships within their respective concentration ranges, with correlation coefficients (R2) of 0.999 7 and 0.999 1, respectively. The detection limits and quantification limits of ion chromatography were 0.7 mg/100 g and 2.1 mg/100 g, while those of enzymatic colorimetry were 0.9 mg/100 g and 2.7 mg/100 g. The recovery rates of ion chromatography and enzymatic colorimetry ranged were 90.7%~102.7% and 86.0%~100.6% (with the spiked amount ranging from 3 mg/100 g to 150 mg/100 g), respectively. The precision of ion chromatography (0.61%~3.83%) was superior to that of enzymatic colorimetry (1.30%~5.85%). The expanded uncertainties for ion chromatography and enzymatic colorimetry were 4.02% and 4.04%, respectively.
Ion chromatography demonstrated comparable advantages over enzymatic colorimetry in terms of sensitivity, precision and cost. It is more suitable for both qualitative and quantitative analysis of choline in infant formula and is recommended as the primary method for enterprises determination.
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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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