Determination of Mercury and Other Metals in Red Yeast Rice
Cynthia C. Smith,
Amir A. Abdalla,
Robert E. Smith.
Chromium, arsenic, cadmium, nickel, selenium, mercury and lead have been determined in red yeast rice
samples by ICP-MS and a Hydra-C mercury analyzer. Less than 0.010 μg/g mercury was found in all but one sample,
which had 0.011 μg/g. The amounts of chromium, arsenic, cadmium, nickel, selenium, cadmium and lead varied from
0.05–0.83 (Cr), 0.05–0.35 (As), 0.004–0.139 (Cd), 0.13–2.05 (Ni), 0.028–0.222 (Se), and 0.000–0.517 (Pb) μg/g. Percent
recoveries of spiked samples ranged from 77 – 111%. Recoveries of mercury in two different standard reference materials
were 83 and 110%. The minimum detection limit and limit of quantitation for mercury were 0.2 and 1.0 ng, respectively.
Keywords: Mercury, arsenic, cadmium, lead, red yeast rice, ICP-MS, CVAAS, dietry suppliment, LDL, clomitrazole
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