Optimization of Extraction Method of Anthocyanins from Red Cabbage

Area of Science:

• Food Science
• Natural Pigments
• Phytochemistry

Background:

• Red cabbage (Brassica oleracea var. capitata f. rubra) is a valuable source of anthocyanins, widely used in food production for natural colorants.
• Anthocyanins are plant pigments responsible for red, purple, and blue hues, with significant antioxidant properties.

Purpose of the Study:

• To optimize the extraction of anthocyanins from red cabbage for natural dye production.
• To investigate the impact of different solvents, pre-treatments, pH, and temperatures on anthocyanin yield and extract color.

Main Methods:

• Red cabbage was extracted using distilled water, 25% ethyl alcohol, and 70% ethyl alcohol.
• Extraction conditions included two pre-treatment groups (dried vs. raw), two pH levels (4.0 and 6.0), and two temperatures (25°C and 75°C), resulting in 24 formulations.
• Colorimetric parameters and anthocyanin content were analyzed for each extract.

Main Results:

• The optimal extraction conditions were identified as using 25% ethyl alcohol as the solvent, a pH of 4.0, and a processing temperature of 25°C.
• This specific method yielded a reddish extract with an average anthocyanin content of 191.37 mg/100 g.
• This represents a 74% increase in anthocyanin yield compared to other tested conditions and solvents.

Conclusions:

• The study successfully identified optimal parameters for maximizing anthocyanin extraction from red cabbage.
• The findings provide a basis for efficient industrial production of natural red dyes from red cabbage, enhancing natural colorant applications.