Analysis of Trace Elements in Ganoderma lucidum Spore Oil by ICP-MS
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Abstract:
The analysis of trace elements in food is necessary for food safety control and nutrition evaluation. This can provide a reference for the proper evaluation of the edible and medicinal value of Ganoderma lucidum spore oil. Commercial G. lucidum spore oil was digested using a microwave digestion system. Pretreatment with a nitric acid and hydrogen peroxide acid system was carried out for the digestion process. This reduced the use of acid and allowed the digestion to be more complete. The concentrations of 24 trace elements in G. lucidum spore oil were determined by inductively coupled plasma mass spectrometry (ICP-MS) in collision mode. The results indicated that G. lucidum spore oil was rich in calcium, phosphorus, magnesium, iron, potassium, and zinc, followed by sodium, tin, strontium, chromium, copper, boron, and manganese. Furthermore, the concentrations of the toxic trace elements lead, arsenic, and mercury were lower than the limits required for health food pollutants. For all measured elements, the linear range of mercury was 0~1 μg/L, and the linear ranges of other elements were 0~100 μg/L. The limit of detection for the instrument ranged from 0.03~7.0 μg/L. The limit of quantitation for the method was in the range of 0.1–23.33 μg/kg. The recoveries ranged from 84.16% to 107.00%, and the relative standard deviations were between 0.83% and 4.25% (n=6). In conclusion, the method demonstrates high precision and sensitivity, and yields reliable results.
