A study of tea in Chongqing region on mineral elements indicates their producing area characters

Abstract

Abstract:

22 enzymes deactivated tea samples gathered form different regions of Chongqing, were microwave digested, and then detected their 32 kinds of mineral elements by ICP-OES and ICP-MS. Result shows quantity of 15 rare-earth elements vary obviously among samples from different regions, the other 17 elements’ content are in the range of several μg to several mg per kilogram. principal component analysis shows that the content of Y, Pr, Nd, Eu, Gd, Tb, Dy, Ho, Er, Fe in Yong Chuan samples are less than other samples; Sr, Al, Ca is found lowest in Ban Nan and Nan Chuan samples, while the highest in Yong Chuan and Rong Chang; samples of other regions were decentralize on the score chart. Then combined with cluster analysis, 22 tea samples was clustered into 6 with a certain degree of similarity during a certain same produing region. The study indicated that determining tea Origin characteristics by mineral elements is feasible. Rare-earth elements' content and Ca、Sr、Ba、Al provide major base to determine provenance of tea.

CLC Number:

TS201.6

References

[1] Dion M. A. M. Luykx, Saskia M. van Ruth. An overview of analytical methods for determining the geographical origin of food products[J]. Food Chemistry. 107(2008)：897–911.

[2] Garcia-Ruiz, S., M. Moldovan, et al. Evaluation of strontium isotope abundance ratios in combination with multi-elemental analysis as a possible tool to study the geographical origin of ciders[J]. Analytica Chimica Acta. 2007, 590(1): 55-66.

[3] Benincasa, C., J. Lewis, et al. "Determination of trace element in Italian virgin olive oils and their characterization according to geographical origin by statistical analysis[J]. Analytica Chimica Acta. 2007, 585(2): 366-370.

[4] Sung-Min Choi, Hae-Suk Lee, Gae-Ho Lee et al. Determination of the strontium isotope ratio by ICP-MS ginseng as a tracer of regional origin[J]. Food Chemistry, 2008, 108: 1149-1154.

[5] Sun, S., B. Guo, et al. Multi-element analysis for determining the geographical origin of mutton from different regions of China[J]. Food Chemistry. 2010, 124(3): 1151-1156.

[6] Nardi, E. P., F. S. Evangelista, et al. The use of inductively coupled plasma mass spectrometry (ICP-MS) for the determination of toxic and essential elements in different types of food samples[J]. Food Chemistry. 2009, 112(3): 727-732.

[7] 谭和平，张苏敏，陈能武. 茶叶中稀土元素的电感耦合等离子体质谱检测方法研究[J].中国测试技术. 2008.3,32(2):85-88.

[8] 田娟娟. 酿酒葡萄叶片和果实矿质元素的产区及品种特性研究[D]. 海南，海南大学.2009年.

[9] 康海宁，杨妙峰，陈波等. 利用矿质元素的测定数据判别茶叶的产地和品种[J]. 岩矿测试. 2006.3,25 (1): 22-26.

[10] 倪永年. 化学计量学在分析化学中的应用[M]. 北京:科学出版社,2004:232 - 234 .

[11] 林杰斌，林川雄. SPSS12.0统计建模与应用实务[M]. 北京:中国铁道出版社,2006.

[12] Pilgrim, T. S., R. J. Watling, et al. Application of trace element and stable isotope signatures to determine the provenance of tea (Camellia sinensis) samples[J]. Food Chemistry 118(4): 921-926

[13] 辛文锋，刘静，曹红斌等. ICP-MS法测定普洱茶中15种无机元素及应用[J]. 北京师范大学学报(自然科学版). 2010.2, 46 (1):92-96.

[14] Wang, X.-p., Y.-j. Ma, et al. Analysis of 23 mineral elements in tea samples collected from China and Japan by using ICP-AES and ICP-MS combined with a closed decomposition][J]. Guang Pu Xue Yu Guang Pu Fen Xi. 2005,25(10): 1703-1707.

[15] BonerM, Fêrstel H. Stable isotope variation as a tool to trace the authenticity of beef [J]. Anal Bioanal Chem. 2004,378 (2):301-310.