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This paper presents an approach that may be applied as an accurate and rapid tool for classifying coffee beans on the basis of the specific kahweol content. Using Fourier-transform Raman spectroscopy with 1064 nm excitation it is possible to monitor the characteristic Raman bands of kahweol in green coffee beans without chemical and physical processing of the beans. The procedure was optimized on the basis of 83 and 125 measurements of whole and ground beans, respectively, using coffee samples of two different species, Coffea arabica L. and Coffea canephora L. (var. Robusta), and different origins (Asia, Africa, and South America). The relative contribution of the kahweol in individual beans can be determined quantitatively by means of a component analysis of the spectra, yielding a spectral kahweol index (σka) that is proportional to the relative content of kahweol in a coffee bean. The reproducibility of the spectroscopic measurement and analysis was found to be 3.5%. Individual beans of the same type and origin reveal a scattering of the σka values. Nevertheless, an unambiguous distinction between Arabica and Robusta samples is possible on the basis of single-bean measurements as the σka values are greater than and less than 10 for Arabica and Robusta coffees, respectively. Measurements of whole and ground beans afforded very similar results, despite the heterogeneous distribution of kahweol within a bean. Unlike conventional analytical techniques, the single-bean sensitivity of the present approach may also allow for a rapid detection of unwanted admixtures of low-value Robusta coffee to high-quality and more expensive Arabica coffee. |
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sweet050708: 金币+25, 翻译EPI+1, ★★★★★最佳答案 2013-04-03 12:53:03
sweet050708: 金币+25, 翻译EPI+1, ★★★★★最佳答案 2013-04-03 12:53:03
| 摘要：这篇论文主要提供了一种准确而快速的根据具体咖啡豆醇品质区分咖啡豆的方法。通过使用1064nm傅里叶变换拉曼光谱进行应激处理，可以监测到绿色咖啡豆里的咖啡豆醇的拉曼谱带特征而咖啡豆本身不会发生化学或物理反应。为确保整个过程的误差最小，分别使用了83个单位的完整咖啡豆和125个单位磨碎的咖啡豆，并且使用了两种咖啡都样品，阿拉伯咖啡L和中粒种咖啡L.（变种罗巴斯塔），以及不同区域的咖啡（亚洲，非洲，和南美国）。每一个咖啡豆的咖啡豆醇在数量上可以通过光谱的成份分析获得，而所得到的咖啡豆醇光谱指数同咖啡豆中的咖啡豆醇成正比例关系的。光谱测量和光谱分析的重现性被确认为3.5%。同一地区的同一种类的不同咖啡豆的咖啡豆醇光谱指数值比较分散。然而，阿拉比卡和罗巴斯塔咖啡样品之间存在一个模糊的差别，即就单个咖啡豆的咖啡豆醇光谱指数而言，阿拉比卡咖啡的咖啡豆醇光谱指数要大于10，而罗巴斯塔咖啡的咖啡豆醇光谱指数要小于10。整体测量和磨碎测量的的咖啡豆的检测结果很相似，尽管一个咖啡豆里分布有不同种类的咖啡豆醇。与传统的分析方法不同，本研究中提到的单豆敏感度分析方法可以快速的从混合有高品质和更昂贵的阿拉比卡咖啡中区别出低附加值的罗布斯塔咖啡。 |
2楼2013-04-02 18:05:31