Fourier transform infrared and physicochemical analyses of roasted coffee

Journal of Agricultural and Food Chemistry
Niya Wang, Loong-Tak Lim

Abstract

In this study, Brazilian coffee beans processed to different stages of roast at 210, 220, 230, and 240 °C were analyzed for pH value, titratable acidity, moisture content, and color lightness. Fourier transform infrared (FTIR) spectroscopy, in conjunction with principal component analysis, was conducted to study the effects of process time and temperature on the IR-active components of the acetyl acetate extract of the roasted coffee. The results showed that high-temperature-short-time resulted in higher moisture content, higher pH value, and higher titratable acidity when the beans were roasted beyond the start-of-second-crack stage, as compare to low-temperature-long-time process (LTLT). The LTLT process also resulted in greater IR absorbance for aldehydes, ketones, aliphatic acids, aromatic acids, and caffeine carbonyl bands on the FTIR spectra. Clusters for principal component score plots were well separated, indicating that the changes IR-active components in the coffee extracts, due to the different roasting treatments, can be discriminated by the FTIR technique. On the basis of the loading plots of principal components, changes of IR-active compounds in the coffee extract at various stages of roasting were discussed.

References

May 15, 2003·Journal of Agricultural and Food Chemistry·Donald J LymanJacqueline Murray-Wijelath
Jun 25, 2008·Journal of Agricultural and Food Chemistry·Juerg BaggenstossFelix Escher
Oct 31, 2008·Talanta·G I DovbeshkoO P Pashchuk
Feb 12, 2009·Journal of Agricultural and Food Chemistry·Siobhán HennessyColm P O'Donnell

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Citations

Oct 20, 2015·Materials Science & Engineering. C, Materials for Biological Applications·Vivek DhandB Sreedhar
Aug 28, 2020·Journal of Environmental Management·Maw Maw TunPetros Gikas
Jan 29, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Ilhami OkurHami Alpas
Nov 17, 2018··FahmiIkhsan Siregar

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