Determination of Inorganic Elements in Edible Zanthoxylum bungeanum Seed Oil by Inductively Coupled Plasma Mass Spectrometry (ICP-MS)
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Abstract:
A method for simultaneously measuring the content of inorganic elements in edible Zanthoxylum bungeanum seed oil (EZBSO) was established. After the EZBSO sample was dissolved in kerosene, 22 elements (Be, B, Na, Mg, P, K, Ca, Ti, V, Mn, Fe, Co, Ni, Cu, Zn, As, Mo, Cd, Sn, Sb, Hg, and Pb) were determined using inductively coupled plasma mass spectrometry (ICP-MS). The signal fluctuations caused by direct injection of organic solvent were eliminated by optimizing the plasma radio frequency power, carrier gas flow rate, sample uptake rate, and other operating parameters. Octopole reaction system (ORS) and internal standard method were used to eliminate the mass spectrometry interference and matrix effect, respectively. The results indicated that the detection limits for the 22 elements were in the range of 0.012~16.25 ng/g, relative standard deviations (RSDs) ranged from 1.28% to 4.16%, and recoveries ranged from 90.00% to 110.00%; the method was accurate and reliable. The element P showed the highest concentration in the EZBSO, followed by the element K. The method can be applied for the quality control and nutritional evaluation of EZBSO.
