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Coffea canephora silverskin from different geographical origins: A comparative study
Sílvia M F Bessada1, Rita C Alves1, Anabela S G Costa1
1REQUIMTE/LAQV, Departamento of Chemical Sciences, Faculty of Pharmacy of University of Porto, R. Jorge Viterbo Ferreira, 228, 4050-313 Porto, Portugal.
The Science of the Total Environment
|September 26, 2018
Summary
Coffee silverskin
Area of Science:
- Agricultural Chemistry
- Food Chemistry
- By-product Valorization
Background:
- Coffee silverskin, a major coffee roasting by-product, has low moisture content, making it stable.
- Current uses include fuel, composting, and soil fertilization.
- It's a natural source of bioactive compounds for food and cosmetic applications, aligning with sustainability and circular economy principles.
Purpose of the Study:
- To investigate the influence of geographical origin on the chemical composition of Coffea canephora silverskin.
- To analyze key parameters including ashes, proteins, fibers, lipids, vitamins, fatty acids, phenolics, caffeine, and antioxidant activity.
Main Methods:
- Analysis of ashes, protein, fiber, and lipid content.
- Chromatographic techniques (HPLC-DAD-FLD, GC-FID, HPLC-DAD) for profiling vitamin E, fatty acids, phenolics, caffeine, 5-caffeoylquinic acid, and hydroxymethylfurfural.
- Assessment of antioxidant profile using DPPH inhibition and Ferric Reducing Antioxidant Power assays.
- Principal Component Analysis (PCA) for sample grouping based on geographical origin.
Main Results:
- Significant variations (p < 0.05) were observed in fatty acid profiles and antioxidant composition among silverskin samples from different origins (Brazil, Uganda, Vietnam, Cameroon, Indonesia, India).
- Brazilian silverskin showed the highest total lipid and vitamin E content.
- Indian silverskin exhibited the lowest phenolic content and antioxidant activity, with a higher proportion of saturated fatty acids.
Conclusions:
- Geographical origin significantly impacts the chemical composition and bioactive potential of coffee silverskin.
- Understanding these variations is crucial for optimizing the valorization of coffee silverskin for food and dermocosmetic industries.
- PCA effectively grouped samples based on geographical proximity, highlighting regional chemical similarities.
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