Phenols

Phenols meaning in wine

Phenols are a diverse group of several hundred chemical compounds naturally present in wine that fundamentally influence its sensory characteristics. These compounds originate primarily from grape skins, seeds, and stems, with additional contributions from oak aging and winemaking processes. The most significant phenolic compounds include tannins (polyphenols that provide structure and astringency), anthocyanins (responsible for red wine color), and flavonoids (contributing to both color and flavor complexity). Phenol concentration varies dramatically based on grape variety, with thick-skinned varieties like Cabernet Sauvignon containing 2,000-4,000 mg/L compared to thin-skinned varieties with 500-1,500 mg/L. These compounds create wine’s mouthfeel through their interaction with saliva proteins, producing sensations ranging from silky smoothness to grippy astringency. Phenols also serve as natural antioxidants, contributing to wine’s aging potential and stability. White wines typically contain 50-400 mg/L of phenols, while red wines range from 1,000-5,000 mg/L due to extended skin contact during fermentation. The phenolic profile evolves during aging, with tannins polymerizing to create softer textures and anthocyanins forming complex pigmented compounds that shift wine color from bright purple to brick red over time.