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Pyrrolomorpholine Spiroketal Alkaloids Present in Roasted Beans of Yunnan Arabica Coffee

Author(s):

GuiLin Hu, DeFu Hong, XiaoYuan Wang, YanBing Wang, Lin Zhou, ZhongRong Li and MingHua Qiu*   Pages 1 - 4 ( 4 )

Abstract:


Background: Coffee is one of the most commonly consumed drinks around the world. During the coffee roasting process, sugars and amines undergo a violent Maillard reaction, resulting in a large number of volatile and non-volatile components. These ingredients have a huge impact on the formation of coffee flavor. In addition, many Maillard products in coffee have also been proven to exert antioxidative, anti-inflammatory effects, etc.

Objective: The objective of this research is to discover non-volatile Maillard reaction products in roasted coffee beans.

Results and Methods: A pair of enantiomers pyrrolomorpholine spiroketal alkaloids 1a and 1b were isolated from roasted beans of Yunnan coffea Arabica. Their planar structures were elucidated by extensive spectroscopic analysis, HRESIMS spectra and X-Ray diffraction.

Conclusion: Two pyrrolomorpholine spiroketal alkaloids were isolated from roasted Arabica coffee beans. And their formation pathway via Maillard reaction was deduced. Their influence on the formation of coffee bitterness and biological functions is worthy of being further studied.

Keywords:

Coffee, coffea arabica, roasted beans, pyrrolomorpholine spiroketal, alkaloid, maillard reaction.

Affiliation:

State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, Yunnan, State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, Yunnan, State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, Yunnan, State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, Yunnan, State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, Yunnan, State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, Yunnan, State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, Yunnan



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