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Caffeine Extraction, Enzymatic Activity and Gene Expression of Caffeine Synthase from Plant Cell Suspensions
Published on: October 2, 2018
Conceptual study on maillardized dietary fiber in coffee
José Manuel Silván1, Francisco J Morales, Fulgencio Saura-Calixto
1Consejo Superior de Investigaciones Científicas (CSIC), Instituto de Ciencia y Tecnología de Alimentos y Nutrición-ICTAN, José Antonio Novais 10, 28040 Madrid, Spain.
Coffee roasting significantly impacts melanoidins and dietary fiber content. Roasting transforms coffee into a maillardized dietary fiber, highlighting a conceptual overlap between these components.
Area of Science:
- Food Science
- Nutritional Biochemistry
Background:
- Coffee melanoidins and dietary fiber share methodological and conceptual similarities.
- Roasting influences the chemical composition and structural properties of coffee beans.
Purpose of the Study:
- To investigate the relationship between coffee roasting, melanoidins formation, and dietary fiber content.
- To evaluate the impact of varying roasting degrees on coffee bean composition.
Main Methods:
- Green Uganda coffee beans were roasted to achieve weight losses from 8.1% to 21.6%.
- Samples were analyzed for color, moisture, solubility, water activity, carbohydrates, polyphenols, protein, soluble dietary fiber (SDF), and melanoidins.
- Chemical markers like hydroxymethylfurfural and chlorogenic acids were measured.
Main Results:
- Melanoidins content increased from 5.6 to 29.1 mg/100 mg soluble dry matter with roasting.
- A melanoidins-like structure in green coffee could lead to overestimation by up to 21%.
- Soluble dietary fiber (SDF) content increased from 39.4 mg/100 mg soluble dry matter in green coffee to 64.9 mg/100 mg soluble dry matter in dark-roasted coffee.
Conclusions:
- Coffee melanoidins contain a significant portion of dietary fiber, and coffee dietary fiber includes melanoidins.
- Coffee dietary fiber undergoes maillardization during roasting, suggesting a redefinition as maillardized dietary fiber.
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