Biological Trace Element Research, 202 (6), 28782890
2 Types of polyphenols The basic phenolic structure of polyphenols is exemplified by these naturally occurring compounds, which are classified according to their chemical composition, particularly the number of aromatic rings, the substituent groups on these rings, and the structural linkages between them ( Figure 1 depicts the chemical structures of essential polyphenol subclasses (lignans, phenolic acids, flavonoids, tannins, coumarins, and stilbenes) along with their respective plant-based food sources, highlighting dietary consumption sources
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