Journal article
Caffeine content in filter coffee brews as a function of degree of roast and extraction yield
Scientific reports, v 14(1), 29126
25 Nov 2024
PMID: 39582028
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
The effect of degree of roast on resulting caffeine content in brewed coffee has been extensively researched, but conflicting methodologies and results have muddled development of a general conclusion. In this study, 30 unique combinations of green coffee variety, degree of roast, and brew time were investigated regarding extraction yield and caffeine content. An AeroPress brewer was used to prepare brew samples using a 15:1 mass ratio of brew water to ground coffee. Refractometry and HPLC were respectively used to measure extraction yield and caffeine content of brewed samples. Scanning electron microscopy was used to measure porosity of roasted seeds and showed increasing porosity with the degree of roast. Extraction yields generally decreased for roast batches with roasting mass losses greater than similar to\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\sim$$\end{document}12-14%, and caffeine concentrations in 10-min brews decreased for roast batches with drop temperatures greater than similar to\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\sim$$\end{document}400-420 degrees\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$<^>{\circ }$$\end{document}F. Under identical brewing conditions, caffeine concentrations in brewed samples were generally lower for dark roasts than light and medium roasts. However, at identical extraction yields, dark roasts generally exhibited higher caffeine concentrations than lighter roasted coffees. It is likely that the volatilization or decomposition of soluble compounds and increased porosity due to roasting act as competing mechanisms that determine compound concentrations in resulting brews.
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Details
- Title
- Caffeine content in filter coffee brews as a function of degree of roast and extraction yield
- Creators
- Zachary R. Lindsey (Corresponding Author) - Berry CollegeJoshua R. Williams - Drexel UniversityJames S. Burgess - Berry CollegeNathan T. Moore - Berry CollegePierce M. Splichal - Berry Consultants, LLC (United States)
- Publication Details
- Scientific reports, v 14(1), 29126
- Publisher
- Nature Publishing
- Number of pages
- 13
- Grant note
- Berry College Office of Undergraduate Research
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemistry
- Web of Science ID
- WOS:001363058400001
- Scopus ID
- 2-s2.0-85210091832
- Other Identifier
- 991022202107904721
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InCites Highlights
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- Web of Science research areas
- Food Science & Technology