AI Article Synopsis
- - The study compares the antioxidant activity, polyphenol content, and mineral levels in various coffee substitutes, finding that acorn-based infusions have the highest antioxidant capacities and polyphenol concentrations.
- - Significant compounds such as gallic and chlorogenic acids were found in all coffee substitutes, with the herbal-cereal option displaying the highest overall phenolic content.
- - A PCA analysis demonstrated strong correlations between antioxidant activity and levels of polyphenols, flavonoids, and gallic acid, while cluster analysis helped categorize the different types of coffee based on these properties.
Article Abstract
The analysis of general content of polyphenols, minerals and antioxidant activity of infusions from selected coffee substitutes is presented. The obtained results showed that the coffee infusions prepared from acorns exhibit the highest radical scavenging capacities for DPPH (EC = 0.063-0.066 mg/mL), ABTS (EC = 0.021-0.029 mg/mL), OH(EC = 2.050-2.378 mg/mL) as well as the highest ability to Fe reduction (FRAP) (∼1.1 mmolFe/g). These coffee substitutes also contain the greatest values of polyphenols (45-50 mgGA/g). Analyzed coffee substitutes differ in both quality and quantity of polyphenols, but all tested coffees contain gallic and chlorogenic acids. The most of phenolic compounds was found in herbal-cereal coffee substitute. The quantitative results and PCA analysis indicated a good correlation between the antioxidant activity and total polyphenols, flavonoids and gallic acid content. Using the obtained data on the composition and antioxidant properties of extracts the cluster analysis (CA) was performed to distinguish similar or close types of coffee.
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| http://dx.doi.org/10.1016/j.foodchem.2018.11.057 | DOI Listing |
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