Arabica and Robusta Coffees: Identification of Major Polar Compounds and Quantification of Blends by Direct-Infusion Electrospray Ionization鈥揗ass Spectrometry
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- 作者：Rafael Garrett ; Boniek G. Vaz ; Ana Maria C. Hovell ; Marcos N. Eberlin ; Claudia M. Rezende
- 刊名：Journal of Agricultural and Food Chemistry
- 出版年：2012
- 出版时间：May 2, 2012
- 年：2012
- 卷：60
- 期：17
- 页码：4253-4258
- 全文大小：229K
- 年卷期：v.60,no.17(May 2, 2012)
- ISSN：1520-5118
文摘
Considering that illegal admixture of robusta coffee into high-quality arabica coffee is an important task in coffee analysis, we evaluated the use of direct-infusion electrospray ionization鈥搈ass spectrometry (ESI鈥揗S) data combined with the partial least-squares (PLS) multivariate calibration technique as a fast way to detect and quantify arabica coffee adulterations by robusta coffee. A total of 16 PLS models were built using ESI(卤) quadrupole time-of-flight (QTOF) and ESI(卤) Fourier transform ion cyclotron resonance (FT-ICR) MS data from hot aqueous extracts of certified coffee samples. The model using the 30 more abundant ions detected by ESI(+) FT-ICR MS produced the most accurate coffee blend percentage prediction, and thus, it was later successfully employed to predict the blend composition of commercial robusta and arabica coffee. In addition, ESI(卤) FT-ICR MS analysis allowed for the identification of 22 compounds in the arabica coffee and 20 compounds in the robusta coffee, mostly phenolics.