Determination of Trace Elements in Coffee Beans by XRF Spectrometer Equipped with Polarization Optics and Its Application to Identification of Their Production Area

被引:8
作者
Akamine, Takao [1 ]
Otaka, Akiko [1 ]
Hokura, Akiko [2 ]
Ito, Yuji [3 ]
Nakai, Izumi [1 ]
机构
[1] Tokyo Univ Sci, Fac Sci, Dept Appl Chem, Shinjuku Ku, Tokyo 1628601, Japan
[2] Tokyo Denki Univ, Sch Engn, Dept Green & Sustainable Chem, Chiyoda Ku, Tokyo 1018457, Japan
[3] Kirin Beverage Co Ltd, Shibuya Ku, Tokyo 1500001, Japan
关键词
coffee beans; X-ray fluorescence analysis; trace elements; geographic origin; multi-variate analysis; X-RAY-FLUORESCENCE; MULTIELEMENT ANALYSIS; GEOGRAPHICAL ORIGIN; CHEMOMETRICS; TEA;
D O I
10.2116/bunsekikagaku.59.863
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The production area of coffee beans becomes a brand name, which gives reputations for the products, which is related to the price. This leads to room for mislabeling the products by unscrupulous market dealers. A rapid and easy method for the analysis of trace-element composition of coffee beans, which could be a good indicator of their production area, was studied in the present work. Coffee beans of 6 different regions (Brazil, Colombia, Vietnam, Indonesia, Tanzania, Guatemala) were analyzed by using a highly sensitive X-ray fluorescence spectrometer with three dimensional polarization optics. The experimental conditions were optimized so as to analyze 6 elements (Mn, Fe, Ni, Rb, Sr, Ba) in coffee beans, and linear calibration curves were obtained for the quantitative analysis of those elements. The analytical results were used in principal-component analysis to classify the coffee beans according to the geographical origin, which results in a successful characterization of the 6 production areas. It is found that roasted beans can be used with the same criterion as their green beans. Consequently, a rapid and easy way for the characterization of the geographic origin of coffee beans has been established in this study.
引用
收藏
页码:863 / 871
页数:9
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