科研之友
微信
新浪微博
Facebook
分享链接
摘要
This study found abnormal concentrations of lanthanides in five Indian teas and four coffees (Brazilian, Indian and Turkish) popular currently in the Middle East. This is of concern, because some lanthanides could have adverse health effects in humans. The original aim of this study was to obtain baseline concentrations as reference data, but elevated levels were encountered. Average levels of lanthanides in tea on a dry mass basis across the five brands were 10-100 times literature values and ranged as follows: La 3.78-3.98, Ce 3.49-4.04, Pr 181-1.86, Lu 1.17-1.24, Tm 1.02-1.08, Nd 4.72-7.97, Eu 2.33-2.43, Gd 4.83-5.28, Tb 1.29-1.37, Dy 3.673.83, Ho 1.20-1.27 and Er 3.48-3.63 mu g/g. For the four coffee brands, the corresponding concentrations were again 10-100 times higher than literature values and were: La 4.00-4 38, Ce 4.05-11.1, Pr 1.93-2.15, Lu 1.28-1 41, Tm 1.05-1.22, Nd 5.07-5.41, Eu 2.402.57, Gd 5.24-7.57, Tb 1.34-1.51, Dy 3.90-4.20, Ho 1.29-1.42 and Er 3.70-3.99 mu g/g (dry mass). Some of these elements have never been studied in tea and coffee before. Specifically, Lu, Tm, Eu, Tb and Ho in tea and Pr, Nd, Ho and Er in coffee have not appeared in the chemical literature before. The impact of lanthanides on human health is reviewed. Quantitation was achieved by inductively coupled plasma-mass spectrometry.
- 出版日期2010-6
