Aluminum and and Heavy Metals concentration in Lycium barbarum L. from genuine producing area

Yahong Zhanga, N.C. Fengb and M.L. Zhuc

a College of pharmacy, NingXia Medical University, China

b College of Basic Medicine, NingXia Medical University, China

c College of Basic Medicine, NingXia Medical University, China

1439113707@qq.com

In recent years, food safety has attracted widespread attention, and heavy metal exceeding the standard is also an important aspect. Lycium barbarum, as one of the traditional Chinese medicine and food homologous plants, is well popular among people. But in its growth process, there will be heavy metal, pesticide residues and other pollution. The consumption of wolfberry containing these harmful substances will pose a great threat to human health, so the content of heavy metals is one of the important indicators to evaluate the quality of wolfberry. At present, there are many studies on the heavy metals in Lycium barbarum, but most of Lycium barbarum not from genuine producing area. This paper try to determine the concentration of Al element and heavy metals in Lycium barbarum from genuine producing area (Zhongning, Ningxia) by ICP-AES method. The contents of Al, Cd, Cu and Zn in Lycium barbarum L. from genuine producing areas were determined by wet digestion and ICP-AES. The methodological results showed that the recoveries of Al and the three heavy metals were Al 46.34%, Cd 84.1%, Cu 70.65% and Zn 92.6%, respectively. The precision was 1.77-3.27. The average contents (mg/kg) of Al and the three metals in Lycium barbarum were Al 66.18(39.26-114.89),Cd 0.08 (ND-0.18),Cu 7.54 (5.22-12.14)and Zn 19.47 (3.36-62.77),respectively. Compared with the standard values, Cd and Cu contents in all samples were within the normal range. The Al content in the sample exceeded the standard value (100mg/kg), and the over-standard rate was 12.5%. The Zn content in the sample exceeded the standard value (50mg/kg), and the over-standard rate was 12.5%.

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