Food-compatible method for the efficient extraction and stabilization of cranberry pomace polyphenols

Area of Science:

• Food Science
• Biochemistry
• Agricultural Byproduct Valorization

Background:

• Cranberry pomace, a byproduct of cranberry processing, contains valuable polyphenols like proanthocyanidins and anthocyanins.
• Currently, cranberry pomace is often discarded due to its unpalatable nature as a direct source of these beneficial compounds.

Purpose of the Study:

• To develop and optimize a method for extracting polyphenols from cranberry pomace using a food-grade solvent.
• To create a stable cranberry polyphenol-rich ingredient by complexing the extract with soy protein isolate (SPI).

Main Methods:

• Extraction of polyphenols from cranberry pomace using aqueous ethanol.
• Biochemical characterization of the extracted polyphenols.
• Co-drying of cranberry pomace extract with soy protein isolate (SPI) to form a cranberry polyphenol-SPI complex (CBP-SPI).

Main Results:

• The optimized method successfully extracted a range of polyphenols from cranberry pomace, comparable to those in cranberry juice concentrate.
• A stable cranberry polyphenol-SPI complex (CBP-SPI) was produced, containing 10% cranberry polyphenols.
• Proanthocyanidins, anthocyanins, and total polyphenols in CBP-SPI demonstrated high stability at 37 °C, unlike dried pomace extract alone.

Conclusions:

• The study presents an innovative approach to valorize cranberry pomace by extracting and stabilizing its beneficial polyphenols.
• The developed cranberry polyphenol-SPI complex (CBP-SPI) represents a promising novel food ingredient with enhanced stability and potential health benefits.