Polyphenol compounds in artichoke plant tissues and varieties

Area of Science:

• Agricultural Science
• Food Science
• Phytochemistry

Background:

• Polyphenols, including caffeoylquinic acids and flavonoids, are bioactive compounds found in plants.
• Artichokes (Cynara cardunculus var. scolymus) are a Mediterranean vegetable with potential health benefits.
• Understanding polyphenol distribution in artichoke tissues and developmental stages is crucial for optimizing their use.

Purpose of the Study:

• To quantify and compare polyphenol content in different tissues and developmental stages of six Mediterranean artichoke varieties.
• To identify specific polyphenols and their localization within artichoke flower heads and leaves.
• To provide insights for promoting artichoke as a nutraceutical food and for extracting health-promoting substances.

Main Methods:

• Analysis of polyphenol compounds (caffeoylquinic acids, flavonoids) in various artichoke tissues (bracts, receptacle) and developmental stages (vegetative, productive).
• Identification of key polyphenols such as chlorogenic acid, cynarin, luteolin 7-O-rutinoside, and luteolin 7-O-glucoside.
• Comparative analysis across six artichoke varietal types, with a focus on 'Violet de Provence'.

Main Results:

• Significant variation in total phenol content was observed among artichoke varieties, with 'Violet de Provence' showing the highest levels.
• Polyphenols like chlorogenic acid and cynarin were preferentially accumulated in specific parts of the artichoke flower head.
• The productive stage of leaves yielded higher concentrations of most detected polyphenols compared to the vegetative stage.

Conclusions:

• Artichoke leaves are a valuable source of health-promoting phenolic compounds with potential phytopharmaceutical applications.
• Both artichoke heads and leaves contain abundant phenolic compounds, supporting their wider utilization beyond fresh market food.
• Encouraging the use of specific artichoke types for both the food and pharmaceutical industries is recommended based on their rich polyphenol profiles.