Bio-based extraction and stabilization of anthocyanins

Area of Science:

• Biotechnology
• Food Science
• Chemical Engineering

Background:

• Anthocyanins are valuable plant pigments found in grapes.
• Traditional extraction methods using alcohol have limitations in efficiency.
• Developing improved methods for anthocyanin recovery is crucial for food and pharmaceutical industries.

Purpose of the Study:

• To investigate a novel fermentation-based approach for recovering anthocyanins from Vitis vinifera grapes.
• To compare the efficacy of this fermentation method against simple alcohol extraction.
• To explore the influence of fermentation conditions on anthocyanin characteristics.

Main Methods:

• Batch fermentation of Zymomonas mobilis with mashed Vitis vinifera and glucose.
• Extraction of anthocyanins using the fermentation biomass/byproducts.
• Comparison of anthocyanin yield and polymeric forms with ethanol extraction.
• Manipulation of aeration levels during fermentation.

Main Results:

• The fermentation-based method recovered significantly higher amounts of anthocyanins compared to simple ethanol extraction.
• The percentage of polymeric anthocyanins could be controlled by adjusting aeration during fermentation.
• Zymomonas mobilis produced ethanol and enzymes/biomass-acting materials contributing to enhanced extraction.

Conclusions:

• Fermentation with Zymomonas mobilis offers a superior method for anthocyanin recovery from grapes.
• This approach allows for manipulation of anthocyanin polymeric forms through controlled aeration.
• The study provides a promising biotechnological strategy for efficient anthocyanin extraction.