Indonesian palm civet coffee discrimination using UV-visible spectroscopy and several chemometrics methods

[摘要] Indonesian palm civet coffee or kopi luwak (Indonesian words for coffee and palm civet) is well known as the world's priciest and rarest coffee. To protect the authenticity of luwak coffee and protect consumer from luwak coffee adulteration, it is very important to develop a simple and inexpensive method to discriminate between civet and non-civet coffee. The discrimination between civet and non-civet coffee in ground roasted (powder) samples is very challenging since it is very difficult to distinguish between the two by using conventional method. In this research, the use of UV-Visible spectra combined with two chemometric methods, SIMCA and PLS-DA, was evaluated to discriminate civet and non-civet ground coffee samples. The spectral data of civet and non-civet coffee were acquired using UV-Vis spectrometer (Genesys™ 10S UV-Vis, Thermo Scientific, USA). The result shows that using both supervised discrimination methods: SIMCA and PLS-DA, all samples were correctly classified into their corresponding classes with 100% rate for accuracy, sensitivity and specificity, respectively.

[发布机构] Department of Agricultural Technology, Lampung State Polytechnic, Jl. Soekarno Hatta No. 10, Rajabasa Bandar Lampung, Indonesia^1;Department of Agricultural Engineering, Faculty of Agriculture, University of Lampung, Jl. Prof. Dr. Soemantri Brojonegoro No. 1, Bandar Lampung; 35145, Indonesia^2

[效力级别] 化学 [学科分类] 生物科学（综合）

[关键词] Chemometric method;Coffee adulterations;Conventional methods;Sensitivity and specificity;Spectral data;UV visible spectroscopy;UV-vis spectrometer;UV-Visible spectra