Roasting Process of Coffee Beans as Studied by Nuclear Magnetic Resonance: Time Course of Changes in Composition

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• 作者：Feifei Wei ; Kazuo Furihata ; Masanori Koda ; Fangyu Hu ; Takuya Miyakawa ; Masaru Tanokura
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2012
• 出版时间：February 1, 2012
• 年：2012
• 卷：60
• 期：4
• 页码：1005-1012
• 全文大小：416K
• 年卷期：v.60,no.4(February 1, 2012)
• ISSN：1520-5118

文摘

In this paper, we report a ¹H and ¹³C nuclear magnetic resonance (NMR)-based comprehensive analysis of coffee bean extracts of different degrees of roast. The roasting process of coffee bean extracts was chemically characterized using detailed signal assignment information coupled with multivariate data analysis. A total of 30 NMR-visible components of coffee bean extracts were monitored simultaneously as a function of the roasting duration. During roasting, components such as sucrose and chlorogenic acids were degraded and components such as quinic acids, N-methylpyridinium, and water-soluble polysaccharides were formed. Caffeine and myo-inositol were relatively thermally stable. Multivariate data analysis indicated that some components such as sucrose, chlorogenic acids, quinic acids, and polysaccharides could serve as chemical markers during coffee bean roasting. The present composition-based quality analysis provides an excellent holistic method and suggests useful chemical markers to control and characterize the coffee-roasting process.

Keywords:

NMR; coffee; complex mixture analysis; roasting process; multivariate statistical analysis