Polyphenol profiles of apple juices

Area of Science:

• Food Science
• Analytical Chemistry
• Nutritional Science

Background:

• Polyphenols in apples are key bioactive compounds influencing health and product quality.
• Varietal differences in apple polyphenol profiles are significant but require detailed characterization.
• Understanding polyphenol content is crucial for developing functional foods and beverages.

Purpose of the Study:

• To comprehensively analyze and compare the polyphenol profiles of dessert and cider apple cultivars.
• To quantify specific polyphenol constituents in fresh and commercial apple juices.
• To establish cultivar-specific polyphenol data for nutritional and product development.

Main Methods:

• High-performance liquid chromatography-photodiode array detection (HPLC-DAD) was employed.
• High-performance liquid chromatography-electrospray ionization-tandem mass spectrometry (HPLC-ESI(neg)-MS/MS) was used for detailed analysis.
• Seventeen key polyphenol constituents were quantified in juices from 11 apple cultivars and 24 commercial samples.

Main Results:

• Significant variations in total polyphenol content were observed between dessert (154–178 mg/L) and cider apples (261–970 mg/L).
• Cider apple juices exhibited higher concentrations of hydroxycinnamic acids, dihydrochalcones, flavan-3-ols, and quercetin derivatives compared to dessert apple juices.
• Commercial apple juices generally contained lower polyphenol levels than freshly prepared juices, with chlorogenic acid being a dominant compound.

Conclusions:

• Apple cultivar significantly impacts polyphenol content and profile, with cider apples being richer sources.
• The data provides essential cultivar-specific polyphenol information for bioactivity research.
• This knowledge supports the development of apple-based products with targeted nutritional benefits.