Extraction of anthocyanins from red cabbage using high pressure CO2

Area of Science:

• Food Science
• Chemical Engineering
• Natural Product Extraction

Background:

• Anthocyanins are valuable plant pigments with antioxidant properties.
• Efficient extraction methods are crucial for utilizing anthocyanins in food and pharmaceutical industries.
• Conventional extraction methods can be time-consuming and less effective.

Purpose of the Study:

• To investigate and compare the extraction kinetics of anthocyanins from red cabbage using high pressure CO(2) (HPCD) and conventional acidified water (CAW).
• To determine the key parameters influencing HPCD anthocyanin extraction efficiency.
• To model the extraction process and evaluate mass transfer characteristics.

Main Methods:

• Extraction of anthocyanins from red cabbage using high pressure CO(2) (HPCD).
• Comparison with conventional acidified water (CAW) extraction.
• Kinetic analysis involving time, temperature, pressure, and solid-liquid ratio (R((S+L)/G)).
• Modeling using the general mass transfer model and Fick's second law diffusion model.

Main Results:

• HPCD extraction kinetics showed two distinct phases: an increasing yield phase and a steady-state yield phase (y(*)).
• Optimal HPCD conditions for higher y(*) included increased temperature, increased pressure, and decreased R((S+L)/G).
• The general mass transfer model provided a better fit (R(2)>0.97) to the kinetic data than Fick's law.
• HPCD reduced the time to reach steady-state yield (t(*)) by half and doubled the overall volumetric mass transfer coefficient (k(L)xa) compared to CAW.

Conclusions:

• High pressure CO(2) is a more efficient and faster method for extracting anthocyanins from red cabbage compared to conventional acidified water.
• Extraction parameters like temperature, pressure, and solvent ratio significantly impact HPCD efficiency.
• The general mass transfer model effectively describes the anthocyanin extraction kinetics under HPCD conditions.